package example;

import io.micronaut.context.annotation.Parameter;
import io.micronaut.data.annotation.Id;
import io.micronaut.data.annotation.ParameterExpression;
import io.micronaut.data.annotation.Query;
import io.micronaut.data.annotation.QueryHint;
import io.micronaut.data.annotation.Repository;
import io.micronaut.data.model.Page;
import io.micronaut.data.model.Pageable;
import io.micronaut.data.model.Slice;
import io.micronaut.data.repository.CrudRepository;

import java.util.List;

@Repository // (1)
interface BookRepository extends CrudRepository<Book, Long> { // (2)
    Book find(String title);
}

package example

import io.micronaut.context.annotation.Executable
import io.micronaut.context.annotation.Parameter
import io.micronaut.data.annotation.*
import io.micronaut.data.model.*
import io.micronaut.data.repository.CrudRepository

@Repository // (1)
interface BookRepository extends CrudRepository<Book, Long> { // (2)
    @Executable
    Book find(String title)
}

package example

import io.micronaut.context.annotation.Executable
import io.micronaut.context.annotation.Parameter
import io.micronaut.data.annotation.*
import io.micronaut.data.model.*
import io.micronaut.data.repository.CrudRepository

@Repository // (1)
interface BookRepository : CrudRepository<Book, Long> { // (2)
    @Executable
    fun find(title: String): Book
}

@Inject
BeanContext beanContext;

@Test
void testAnnotationMetadata() {
    String query = beanContext.getBeanDefinition(BookRepository.class) // (1)
            .getRequiredMethod("find", String.class) // (2)
            .getAnnotationMetadata().stringValue(Query.class) // (3)
            .orElse(null);

    assertEquals( // (4)
            "SELECT book_ FROM example.Book AS book_ WHERE (book_.title = :p1)", query);

}

@Inject
BeanContext beanContext

void "test annotation metadata"() {
    given:"The value of the Query annotation"
    String query = beanContext.getBeanDefinition(BookRepository.class) // (1)
            .getRequiredMethod("find", String.class) // (2)
            .getAnnotationMetadata()
            .stringValue(Query.class) // (3)
            .orElse(null)

    expect:"The JPA-QL query to be correct" // (4)
    query == "SELECT book_ FROM example.Book AS book_ WHERE (book_.title = :p1)"
}

@Inject
lateinit var beanContext: BeanContext

@Test
fun testAnnotationMetadata() {
    val query = beanContext.getBeanDefinition(BookRepository::class.java) // (1)
            .getRequiredMethod<Any>("find", String::class.java) // (2)
            .annotationMetadata
            .stringValue(Query::class.java) // (3)
            .orElse(null)


    assertEquals( // (4)
            "SELECT book_ FROM example.Book AS book_ WHERE (book_.title = :p1)",
            query
    )

}

package example;

import io.micronaut.data.annotation.Repository;
import io.micronaut.data.repository.CrudRepository;

import jakarta.persistence.EntityManager;
import java.util.List;

@Repository
public abstract class AbstractBookRepository implements CrudRepository<Book, Long> {

    private final EntityManager entityManager;

    public AbstractBookRepository(EntityManager entityManager) {
        this.entityManager = entityManager;
    }

    public List<Book> findByTitle(String title) {
        return entityManager.createQuery("FROM Book AS book WHERE book.title = :title", Book.class)
                    .setParameter("title", title)
                    .getResultList();
    }
}

package example

import io.micronaut.data.annotation.Repository
import io.micronaut.data.repository.CrudRepository

import jakarta.persistence.EntityManager

@Repository
abstract class AbstractBookRepository implements CrudRepository<Book, Long> {

    private final EntityManager entityManager

    AbstractBookRepository(EntityManager entityManager) {
        this.entityManager = entityManager
    }

    List<Book> findByTitle(String title) {
        return entityManager.createQuery("FROM Book AS book WHERE book.title = :title", Book)
                .setParameter("title", title)
                .getResultList()
    }
}

package example

import io.micronaut.data.annotation.Repository
import io.micronaut.data.repository.CrudRepository

import jakarta.persistence.EntityManager

@Repository
abstract class AbstractBookRepository(private val entityManager: EntityManager) : CrudRepository<Book, Long> {

    fun findByTitle(title: String): List<Book> {
        return entityManager.createQuery("FROM Book AS book WHERE book.title = :title", Book::class.java)
                .setParameter("title", title)
                .resultList
    }
}

package example;

import io.micronaut.data.annotation.Repository;
import io.micronaut.data.repository.CrudRepository;

import jakarta.validation.Valid;
import jakarta.validation.constraints.Min;

@Repository
public interface AccountRepository extends CrudRepository<@Valid Account, @Min(0) Long> {
}

package example

import io.micronaut.data.annotation.Repository
import io.micronaut.data.repository.CrudRepository

@Repository
interface AccountRepository extends CrudRepository<@jakarta.validation.Valid Account, @jakarta.validation.constraints.Min(0) Long> {
}

package example

import io.micronaut.data.annotation.Repository
import io.micronaut.data.repository.CrudRepository

@Repository
interface AccountRepository : CrudRepository<@jakarta.validation.Valid Account, @jakarta.validation.constraints.Min(0) Long>

Book findByTitle(String title);

Book getByTitle(String title);

Book retrieveByTitle(String title);

Book findByTitle(String title)

Book getByTitle(String title)

Book retrieveByTitle(String title)

fun findByTitle(title: String): Book

fun getByTitle(title: String): Book

fun retrieveByTitle(title: String): Book

Book find(String title);

@Executable
Book find(String title)

@Executable
fun find(title: String): Book

List<Book> findByPagesGreaterThan(int pageCount);

List<Book> findByPagesGreaterThan(int pageCount)

fun findByPagesGreaterThan(pageCount: Int): List<Book>

List<Book> findByPagesGreaterThanOrTitleLike(int pageCount, String title);

List<Book> findByPagesGreaterThanOrTitleLike(int pageCount, String title)

fun findByPagesGreaterThanOrTitleLike(pageCount: Int, title: String): List<Book>

List<Book> findByPagesGreaterThan(int pageCount, Pageable pageable);

Page<Book> findByTitleLike(String title, Pageable pageable);

Slice<Book> list(Pageable pageable);

List<Book> findByPagesGreaterThan(int pageCount, Pageable pageable)

Page<Book> findByTitleLike(String title, Pageable pageable)

Slice<Book> list(Pageable pageable)

fun findByPagesGreaterThan(pageCount: Int, pageable: Pageable): List<Book>

fun findByTitleLike(title: String, pageable: Pageable): Page<Book>

fun list(pageable: Pageable): Slice<Book>

bookRepository.saveAll(Arrays.asList(new Book("The Stand", 1000), new Book("The Shining", 600),
        new Book("The Power of the Dog", 500), new Book("The Border", 700),
        new Book("Along Came a Spider", 300), new Book("Pet Cemetery", 400), new Book("A Game of Thrones", 900),
        new Book("A Clash of Kings", 1100)));

bookRepository.saveAll(Arrays.asList(
        new Book("The Stand", 1000),
        new Book("The Shining", 600),
        new Book("The Power of the Dog", 500),
        new Book("The Border", 700),
        new Book("Along Came a Spider", 300),
        new Book("Pet Cemetery", 400),
        new Book("A Game of Thrones", 900),
        new Book("A Clash of Kings", 1100)
))

bookRepository.saveAll(Arrays.asList(
        Book(0,"The Stand", 1000),
        Book(0,"The Shining", 600),
        Book(0,"The Power of the Dog", 500),
        Book(0,"The Border", 700),
        Book(0,"Along Came a Spider", 300),
        Book(0,"Pet Cemetery", 400),
        Book(0,"A Game of Thrones", 900),
        Book(0,"A Clash of Kings", 1100)
))

Slice<Book> slice = bookRepository.list(Pageable.from(0, 3));
List<Book> resultList = bookRepository.findByPagesGreaterThan(500, Pageable.from(0, 3));
Page<Book> page = bookRepository.findByTitleLike("The%", Pageable.from(0, 3));

Slice<Book> slice = bookRepository.list(Pageable.from(0, 3))
List<Book> resultList =
        bookRepository.findByPagesGreaterThan(500, Pageable.from(0, 3))
Page<Book> page = bookRepository.findByTitleLike("The%", Pageable.from(0, 3))

val slice = bookRepository.list(Pageable.from(0, 3))
val resultList = bookRepository.findByPagesGreaterThan(500, Pageable.from(0, 3))
val page = bookRepository.findByTitleLike("The%", Pageable.from(0, 3))

CursoredPage<Book> find(CursoredPageable pageable); // (1)

CursoredPage<Book> findByPagesBetween(int minPageCount, int maxPageCount, Pageable pageable); // (2)

Page<Book> findByTitleStartingWith(String title, Pageable pageable); // (3)

CursoredPage<Book> find(CursoredPageable pageable) // (1)

CursoredPage<Book> findByPagesBetween(int minPageCount, int maxPageCount, Pageable pageable) // (2)

Page<Book> findByTitleStartingWith(String title, Pageable pageable) // (3)

fun find(pageable: CursoredPageable): CursoredPage<Book> // (1)

fun findByPagesBetween(minPageCount: Int, maxPageCount: Int, pageable: Pageable): CursoredPage<Book> // (2)

fun findByTitleStartingWith(title: String, pageable: Pageable): Page<Book>  // (3)

CursoredPage<Book> page =  // (1)
    bookRepository.find(CursoredPageable.from(5, Sort.of(Order.asc("title"))));
CursoredPage<Book> page2 = bookRepository.find(page.nextPageable()); // (2)
CursoredPage<Book> pageByPagesBetween = // (3)
    bookRepository.findByPagesBetween(400, 700, Pageable.from(0, 3));
Page<Book> pageByTitleStarts = // (4)
    bookRepository.findByTitleStartingWith("The", CursoredPageable.from( 3, Sort.unsorted()));

CursoredPage<Book> page =  // (1)
        bookRepository.find(CursoredPageable.from(5, Sort.of(Sort.Order.asc("title"))))
CursoredPage<Book> page2 = bookRepository.find(page.nextPageable()) // (2)
CursoredPage<Book> pageByPagesBetween = // (3)
        bookRepository.findByPagesBetween(400, 700, Pageable.from(0, 3))
Page<Book> pageByTitleStarts = // (4)
        bookRepository.findByTitleStartingWith("The", CursoredPageable.from( 3, Sort.unsorted()))

val page =  // (1)
    bookRepository.find(CursoredPageable.from(5, Sort.of(Sort.Order.asc("title"))))
val page2 = bookRepository.find(page.nextPageable()) // (2)
val pageByPagesBetween =  // (3)
    bookRepository.findByPagesBetween(400, 700, Pageable.from(0, 3))
val pageByTitleStarts =  // (4)
    bookRepository.findByTitleStartingWith("The", CursoredPageable.from(3, Sort.unsorted()))

List<Book> listOrderByTitle();

List<Book> listOrderByTitleDesc();

List<Book> listOrderByTitle()

List<Book> listOrderByTitleDesc()

fun listOrderByTitle(): List<Book>

fun listOrderByTitleDesc(): List<Book>

List<String> findTitleByPagesGreaterThan(int pageCount);

List<String> findTitleByPagesGreaterThan(int pageCount)

fun findTitleByPagesGreaterThan(pageCount: Int): List<String>

List<Book> findTop3ByTitleLike(String title);

List<Book> findTop3ByTitleLike(String title)

fun findTop3ByTitleLike(title: String): List<Book>

package example;

import io.micronaut.core.annotation.Introspected;

@Introspected
public class BookDTO {

    private String title;
    private int pages;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public int getPages() {
        return pages;
    }

    public void setPages(int pages) {
        this.pages = pages;
    }
}

package example

import io.micronaut.core.annotation.Introspected

@Introspected
class BookDTO {
    String title
    int pages
}

package example

import io.micronaut.core.annotation.Introspected

@Introspected
data class BookDTO(
    var title: String,
    var pages: Int
)

BookDTO findOne(String title);

BookDTO findOne(String title);

fun findOne(title: String): BookDTO

@Query("FROM Book b WHERE b.title = :t ORDER BY b.title")
List<Book> listBooks(String t);

@Query("FROM Book b WHERE b.title = :t ORDER BY b.title")
List<Book> listBooks(String t)

@Query("FROM Book b WHERE b.title = :t ORDER BY b.title")
fun listBooks(t: String): List<Book>

package example;

import io.micronaut.data.annotation.*;
import io.micronaut.data.model.naming.NamingStrategies;

@MappedEntity(namingStrategy = NamingStrategies.Raw.class)
@Where("@.userEnabled = true") // (1)
public class User {
    @GeneratedValue
    @Id
    private Long id;
    private String userName;
    private boolean userEnabled = true; // (2)

    public User(String userName) {
        this.userName = userName;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public boolean isUserEnabled() {
        return userEnabled;
    }

    public void setUserEnabled(boolean userEnabled) {
        this.userEnabled = userEnabled;
    }
}

package example

import groovy.transform.EqualsAndHashCode
import io.micronaut.data.annotation.*

@MappedEntity
@Where("@.enabled = true") // (1)
@EqualsAndHashCode(includes = "name")
class User {
    @GeneratedValue
    @Id
    Long id
    String name
    boolean enabled = true // (2)

    User(String name) {
        this.name = name
    }
}

package example

import io.micronaut.data.annotation.GeneratedValue
import io.micronaut.data.annotation.Id
import io.micronaut.data.annotation.MappedEntity
import io.micronaut.data.annotation.Where


@MappedEntity
@Where("@.enabled = true") // (1)
data class User(
    @GeneratedValue
    @field:Id
    var id: Long,
    val name: String,
    val enabled: Boolean // (2)
)

package example;

import io.micronaut.core.annotation.NonNull;
import io.micronaut.data.annotation.Query;
import io.micronaut.data.jdbc.annotation.JdbcRepository;
import io.micronaut.data.model.query.builder.sql.Dialect;
import io.micronaut.data.repository.CrudRepository;
import jakarta.validation.constraints.NotNull;
import java.util.List;

@JdbcRepository(dialect = Dialect.H2)
public interface UserRepository extends CrudRepository<User, Long> { // (1)

    @Override
    @Query("UPDATE user SET userEnabled = false WHERE id = :id") // (2)
    void deleteById(@NonNull @NotNull Long id);

    @Query("SELECT * FROM user WHERE userEnabled = false") // (3)
    List<User> findDisabled();
}

package example

import io.micronaut.core.annotation.NonNull
import io.micronaut.data.annotation.Query
import io.micronaut.data.jdbc.annotation.JdbcRepository
import io.micronaut.data.model.query.builder.sql.Dialect
import io.micronaut.data.repository.CrudRepository

import jakarta.validation.constraints.NotNull

@JdbcRepository(dialect = Dialect.H2)
interface UserRepository extends CrudRepository<User, Long> { // (1)

    @Override
    @Query("UPDATE user SET enabled = false WHERE id = :id") // (2)
    void deleteById(@NonNull @NotNull Long id)

    @Query("SELECT * FROM user WHERE enabled = false") // (3)
    List<User> findDisabled()
}

package example

import io.micronaut.data.annotation.Query
import io.micronaut.data.jdbc.annotation.JdbcRepository
import io.micronaut.data.model.query.builder.sql.Dialect
import io.micronaut.data.repository.CrudRepository

@JdbcRepository(dialect = Dialect.H2)
interface UserRepository : CrudRepository<User, Long> { // (1)

    @Query("UPDATE user SET enabled = false WHERE id = :id") // (2)
    override fun deleteById(id: Long)

    @Query("SELECT * FROM user WHERE enabled = false") // (3)
    fun findDisabled(): List<User>
}

package example;

import io.micronaut.data.annotation.Where;

import java.util.List;

public interface UserRepositoryWithWhere {

    // ...

    @Where("@.enabled = false")
    List<User> findDisabled();
}

package example

import io.micronaut.data.annotation.Where

interface UserRepositoryWithWhere {

    // ...

    @Where("@.enabled = false")
    List<User> findDisabled()
}

package example

import io.micronaut.data.annotation.Where

interface UserRepositoryWithWhere {
    // ...
    @Where("@.enabled = false")
    fun findDisabled(): List<User>
}

@Repository
public interface ProductRepository extends CrudRepository<Product, Long>, JpaSpecificationExecutor<Product> {
    @Join("manufacturer")
    CompletableFuture<Product> findByNameContains(String str);

    CompletableFuture<Long> countByManufacturerName(String name);
}

@Repository
abstract class ProductRepository implements CrudRepository<Product, Long>, JpaSpecificationExecutor<Product> {
    @Join("manufacturer")
    abstract CompletableFuture<Product> findByNameContains(String str)

    abstract CompletableFuture<Long> countByManufacturerName(String name)
}

@Repository
interface ProductRepository : CrudRepository<Product, Long>, JpaSpecificationExecutor<Product> {
    @Join("manufacturer")
    fun findByNameContains(str: String): CompletableFuture<Product>

    fun countByManufacturerName(name: String): CompletableFuture<Long>
}

long total = productRepository.findByNameContains("o")
        .thenCompose(product -> productRepository.countByManufacturerName(product.getManufacturer().getName()))
        .get(1000, TimeUnit.SECONDS);

Assertions.assertEquals(
        2,
        total
);

when:"A result is retrieved using async composition"
long total = productRepository.findByNameContains("o")
        .thenCompose { product -> productRepository.countByManufacturerName(product.manufacturer.name) }
        .get(1000, TimeUnit.SECONDS)

then:"the result is correct"
total == 2

val total = productRepository.findByNameContains("o")
        .thenCompose { product -> productRepository.countByManufacturerName(product.manufacturer.name) }
        .get(1000, TimeUnit.SECONDS)

assertEquals(
        2,
        total
)

@Join("manufacturer")
Maybe<Product> queryByNameContains(String str);

Single<Long> countDistinctByManufacturerName(String name);

@Join("manufacturer")
abstract Maybe<Product> queryByNameContains(String str)

abstract Single<Long> countDistinctByManufacturerName(String name)

@Join("manufacturer")
fun queryByNameContains(str: String): Maybe<Product>

fun countDistinctByManufacturerName(name: String): Single<Long>

long total = productRepository.queryByNameContains("o")
        .flatMap(product -> productRepository.countDistinctByManufacturerName(product.getManufacturer().getName())
                                .toMaybe())
        .defaultIfEmpty(0L)
        .blockingGet();

Assertions.assertEquals(
        2,
        total
);

when:"A result is retrieved with reactive composition"
long total = productRepository.queryByNameContains("o")
        .flatMap { product -> productRepository.countDistinctByManufacturerName(product.manufacturer.name).toMaybe() }
        .defaultIfEmpty(0L)
        .blockingGet()

then:"The result is correct"
total == 2

val total = productRepository.queryByNameContains("o")
        .flatMap { product ->
            productRepository.countDistinctByManufacturerName(product.manufacturer.name)
                    .toMaybe()
        }
        .defaultIfEmpty(0L)
        .blockingGet()

assertEquals(
        2,
        total
)

@Override
Book save(Book entity);

Book save(Book entity)

fun save(entity: Book): Book

Book persist(String title, int pages);

Book persist(String title, int pages)

fun persist(title: String, pages: Int): Book

@Query("INSERT INTO Book(title, pages) VALUES (:title, :pages)")
@ParameterExpression(name = "title", expression = "#{book.title + 'ABC'}")
@ParameterExpression(name = "pages", expression = "#{book.pages}")
void insertCustomExp(Book book);

@Query("INSERT INTO Book(title, pages) VALUES (:title, :pages)")
void insertOne(Book book);

@Query("INSERT INTO Book(title, pages) VALUES (:title, :pages)")
void insertMany(Iterable<Book> books);

@Query("INSERT INTO Book(title, pages) VALUES (:title, :pages)")
void insert(String title, int pages)

@Query("INSERT INTO Book(title, pages) VALUES (:title, :pages)")
void insertOne(Book entity)

@Query("INSERT INTO Book(title, pages) VALUES (:title, :pages)")
void insertMany(Iterable<Book> entities)

@Query("INSERT INTO Book(title, pages) VALUES (:title, :pages)")
fun insert(title: String, pages: Int)

@Query("INSERT INTO Book(title, pages) VALUES (:title, :pages)")
fun insertOne(book: Book)

@Query("INSERT INTO Book(title, pages) VALUES (:title, :pages)")
fun insertMany(books: Iterable<Book>)

@Override
Book update(Book newBook);

Book update(Book newBook)

fun update(newBook: Book): Book

void update(@Id Long id, int pages);

void update(@Id Long id, int pages)

fun update(@Id id: Long?, pages: Int)

void updateByTitle(String title, int pages);

void updateByTitle(String title, int pages)

fun updateByTitle(title: String, pages: Int)

@Query("UPDATE book SET title = :title where id = :id")
void updateOne(Book book);

@Query("UPDATE book SET title = :title where id = :id")
void updateMany(Iterable<Book> books);

@Query("UPDATE book SET title = :title where id = :id")
void updateOne(Book book)

@Query("UPDATE book SET title = :title where id = :id")
void updateMany(Iterable<Book> books)

@Query("UPDATE book SET title = :title where id = :id")
fun updateOne(book: Book)

@Query("UPDATE book SET title = :title where id = :id")
fun updateMany(books: Iterable<Book>)

@Query("UPDATE book SET title = :title where id = :id")
void updateOne(Book book);

@Query("UPDATE book SET title = :title where id = :id")
void updateMany(Iterable<Book> books);

@Query("UPDATE book SET title = :title where id = :id")
void updateOne(Book book)

@Query("UPDATE book SET title = :title where id = :id")
void updateMany(Iterable<Book> books)

@Query("UPDATE book SET title = :title where id = :id")
fun updateOne(book: Book)

@Query("UPDATE book SET title = :title where id = :id")
fun updateMany(books: Iterable<Book>)

@Override
void deleteAll();

void deleteAll()

override fun deleteAll()

void delete(String title);

void delete(String title)

fun delete(title: String)

void deleteByTitleLike(String title);

void deleteByTitleLike(String title)

fun deleteByTitleLike(title: String)

@Query("DELETE FROM Book WHERE title = :title")
void deleteOne(Book book);

@Query("DELETE FROM Book WHERE title = :title")
void deleteMany(Iterable<Book> books);

@Query("DELETE FROM Book WHERE title = :title")
void deleteOne(Book book)

@Query("DELETE FROM Book WHERE title = :title")
void deleteMany(Iterable<Book> books)

@Query("DELETE FROM Book WHERE title = :title")
fun deleteOne(book: Book)

@Query("DELETE FROM Book WHERE title = :title")
fun deleteMany(books: Iterable<Book>)

package example;

import jakarta.persistence.Column;
import jakarta.persistence.Convert;
import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.Id;
import jakarta.persistence.PrePersist;
import java.nio.charset.StandardCharsets;
import java.time.MonthDay;
import java.util.Base64;

@Entity
public class Account {
    @GeneratedValue
    @Id
    private Long id;
    private String username;
    private String password;
    @Column(columnDefinition = "date")
    @Convert(converter = MonthDayDateAttributeConverter.class)
    private MonthDay paymentDay;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public MonthDay getPaymentDay() {
        return paymentDay;
    }

    public void setPaymentDay(MonthDay paymentDay) {
        this.paymentDay = paymentDay;
    }

    @PrePersist
    void encodePassword() {
        this.password = Base64.getEncoder()
                .encodeToString(this.password.getBytes(StandardCharsets.UTF_8));
    }
}

package example

import jakarta.persistence.*
import java.nio.charset.StandardCharsets

@Entity
class Account {
    @GeneratedValue
    @Id
    Long id
    String username
    String password

    @PrePersist
    void encodePassword() {
        this.password = Base64.encoder
                .encodeToString(this.password.getBytes(StandardCharsets.UTF_8))
    }
}

package example

import java.nio.charset.StandardCharsets
import java.util.*
import jakarta.persistence.*

@Entity
data class Account(@GeneratedValue @Id
                   var id: Long? = null,
                   val username: String,
                   var password: String) {

    @PrePersist
    fun encodePassword() {
        password = Base64.getEncoder()
            .encodeToString(password.toByteArray(StandardCharsets.UTF_8))
    }
}

package example;

import io.micronaut.data.annotation.event.PrePersist;

import jakarta.inject.Singleton;

@Singleton
public class AccountUsernameValidator {
    @PrePersist
    void validateUsername(Account account) {
        final String username = account.getUsername();
        if (username == null || !username.matches("[a-z0-9]+")) {
            throw new IllegalArgumentException("Invalid username");
        }
    }
}

package example

import io.micronaut.data.annotation.event.PrePersist

import jakarta.inject.Singleton

@Singleton
class AccountUsernameValidator {
    @PrePersist
    void validateUsername(Account account) {
        final String username = account.username
        if (!username || !(username ==~ /[a-z0-9]+/)) {
            throw new IllegalArgumentException("Invalid username")
        }
    }
}

package example

import io.micronaut.data.annotation.event.PrePersist
import jakarta.inject.Singleton

@Singleton
class AccountUsernameValidator {
    @PrePersist
    fun validateUsername(account: Account) {
        val username: String = account.username
        require(username.matches("[a-z0-9]+".toRegex())) { "Invalid username" }
    }
}

package example;

import io.micronaut.context.annotation.Factory;
import io.micronaut.data.event.listeners.PostPersistEventListener;
import io.micronaut.data.event.listeners.PrePersistEventListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import jakarta.inject.Singleton;

@Factory
public class BookListeners {
    private static final Logger LOG = LoggerFactory.getLogger(BookListeners.class);

    @Singleton
    PrePersistEventListener<Book> beforeBookPersist() { // (1)
        return (book) -> {
            LOG.debug("Inserting book: {}", book.getTitle() );
            return true; // (2)
        };
    }

    @Singleton
    PostPersistEventListener<Book> afterBookPersist() { // (3)
        return (book) -> LOG.debug("Book inserted: {}", book.getTitle() );
    }
}

package example

import io.micronaut.context.annotation.Factory
import io.micronaut.data.event.listeners.PostPersistEventListener
import io.micronaut.data.event.listeners.PrePersistEventListener
import org.slf4j.Logger
import org.slf4j.LoggerFactory

import jakarta.inject.Singleton

@Factory
class BookListeners {
    private static final Logger LOG = LoggerFactory.getLogger(BookListeners)

    @Singleton
    PrePersistEventListener<Book> beforeBookPersist() { // (1)
        return (book) -> {
            LOG.debug "Inserting book: ${book.title}"
            return true // (2)
        }
    }

    @Singleton
    PostPersistEventListener<Book> afterBookPersist() { // (3)
        return (book) -> LOG.debug("Book inserted: ${book.title}")
    }
}

package example

import io.micronaut.context.annotation.Factory
import io.micronaut.data.event.listeners.PostPersistEventListener
import io.micronaut.data.event.listeners.PrePersistEventListener
import org.slf4j.LoggerFactory
import jakarta.inject.Singleton

@Factory
class BookListeners {
    @Singleton
    fun beforeBookPersist(): PrePersistEventListener<Book> { // (1)
        return PrePersistEventListener { book: Book ->
            LOG.debug("Inserting book: ${book.title}")
            true // (2)
        }
    }

    @Singleton
    fun afterBookPersist(): PostPersistEventListener<Book> { // (3)
        return PostPersistEventListener { book: Book ->
            LOG.debug("Book inserted: ${book.title}")
        }
    }

    companion object {
        private val LOG = LoggerFactory.getLogger(BookListeners::class.java)
    }
}

@JdbcRepository(dialect = Dialect.H2)
public interface PersonRepository extends CrudRepository<Person, Long>, JpaSpecificationExecutor<Person> {
}

@JdbcRepository(dialect = Dialect.H2)
interface PersonRepository extends CrudRepository<Person, Long>, JpaSpecificationExecutor<Person> {
}

@JdbcRepository(dialect = Dialect.H2)
interface PersonRepository : CrudRepository<Person, Long>, JpaSpecificationExecutor<Person> {
}

Optional<Person> findOne(PredicateSpecification<Person> spec);

Optional<Person> findOne(QuerySpecification<Person> spec);

List<Person> findAll(PredicateSpecification<Person> spec);

List<Person> findAll(QuerySpecification<Person> spec);

List<Person> findAll(PredicateSpecification<Person> spec, Sort sort);

List<Person> findAll(QuerySpecification<Person> spec, Sort sort);

Page<Person> findAll(PredicateSpecification<Person> spec, Pageable pageable);

Page<Person> findAll(QuerySpecification<Person> spec, Pageable pageable);

Optional<Person> findOne(PredicateSpecification<Person> spec)

Optional<Person> findOne(QuerySpecification<Person> spec)

List<Person> findAll(PredicateSpecification<Person> spec)

List<Person> findAll(QuerySpecification<Person> spec)

List<Person> findAll(PredicateSpecification<Person> spec, Sort sort)

List<Person> findAll(QuerySpecification<Person> spec, Sort sort)

Page<Person> findAll(PredicateSpecification<Person> spec, Pageable pageable)

Page<Person> findAll(QuerySpecification<Person> spec, Pageable pageable)

fun findOne(spec: PredicateSpecification<Person>?): Optional<Person>

fun findOne(spec: QuerySpecification<Person>?): Optional<Person>

fun findAll(spec: PredicateSpecification<Person>?): List<Person>

fun findAll(spec: QuerySpecification<Person>?): List<Person>

fun findAll(spec: PredicateSpecification<Person>?, sort: Sort): List<Person>

fun findAll(spec: QuerySpecification<Person>?, sort: Sort): List<Person>

fun findAll(spec: PredicateSpecification<Person>?, pageable: Pageable): Page<Person>

fun findAll(spec: QuerySpecification<Person>?, pageable: Pageable): Page<Person>

long count(PredicateSpecification<Person> spec);

long count(QuerySpecification<Person> spec);

long count(PredicateSpecification<Person> spec)

long count(QuerySpecification<Person> spec)

fun count(spec: PredicateSpecification<Person>?): Long

fun count(spec: QuerySpecification<Person>?): Long

class Specifications {

    static PredicateSpecification<Person> nameEquals(String name) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get(Person_.name), name);
    }

    static PredicateSpecification<Person> longNameEquals(String longName) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get(Person_.longName), longName);
    }

    static PredicateSpecification<Person> ageIsLessThan(int age) {
        return (root, criteriaBuilder) -> criteriaBuilder.lessThan(root.get(Person_.age), age);
    }

}

class Specifications {

    static PredicateSpecification<Person> nameEquals(String name) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get("name"), name)
    }

    static PredicateSpecification<Person> ageIsLessThan(int age) {
        return (root, criteriaBuilder) -> criteriaBuilder.lessThan(root.get("age"), age)
    }

}

object Specifications {

    fun nameEquals(name: String?) = PredicateSpecification<Person> { root, criteriaBuilder ->
        criteriaBuilder.equal(root.get<Any>("name"), name)
    }

    fun ageIsLessThan(age: Int) = PredicateSpecification<Person> { root, criteriaBuilder ->
        criteriaBuilder.lessThan(root.get("age"), age)
    }

}

Person denis = personRepository.findOne(nameEquals("Denis")).orElse(null);

Person josh = personRepository.findOne(longNameEquals("Josh PM")).orElse(null);

long countAgeLess30 = personRepository.count(ageIsLessThan(30));

long countAgeLess20 = personRepository.count(ageIsLessThan(20));

long countAgeLess30NotDenis = personRepository.count(ageIsLessThan(30).and(not(nameEquals("Denis"))));

List<Person> people = personRepository.findAll(where(nameEquals("Denis").or(nameEquals("Josh"))));

Person denis = personRepository.findOne(nameEquals("Denis")).orElse(null)

long countAgeLess30 = personRepository.count(ageIsLessThan(30))

long countAgeLess20 = personRepository.count(ageIsLessThan(20))

long countAgeLess30NotDenis = personRepository.count(ageIsLessThan(30) & not(nameEquals("Denis")))

List<Person> people = personRepository.findAll(where(nameEquals("Denis") | nameEquals("Josh")))

val denis: Person? = personRepository.findOne(nameEquals("Denis")).orElse(null)

val countAgeLess30: Long = personRepository.count(ageIsLessThan(30))

val countAgeLess20: Long = personRepository.count(ageIsLessThan(20))

val countAgeLess30NotDenis: Long = personRepository.count(ageIsLessThan(30).and(not(nameEquals("Denis"))))

val people = personRepository.findAll(PredicateSpecification.where(nameEquals("Denis").or(nameEquals("Josh"))))

long updateAll(UpdateSpecification<Person> spec);

long updateAll(UpdateSpecification<Person> spec)

fun updateAll(spec: UpdateSpecification<Person>?): Long

query.set(root.get(Person_.name), newName);

query.set(root.get("name"), newName)

query.set(root.get("name"), newName)

class Specifications {

    static PredicateSpecification<Person> nameEquals(String name) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get(Person_.name), name);
    }

    static PredicateSpecification<Person> longNameEquals(String longName) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get(Person_.longName), longName);
    }

    static PredicateSpecification<Person> ageIsLessThan(int age) {
        return (root, criteriaBuilder) -> criteriaBuilder.lessThan(root.get(Person_.age), age);
    }

    static UpdateSpecification<Person> setNewName(String newName) {
        return (root, query, criteriaBuilder) -> {
            query.set(root.get(Person_.name), newName);
            return null;
        };
    }
}

class Specifications {

    static PredicateSpecification<Person> nameEquals(String name) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get("name"), name)
    }

    static PredicateSpecification<Person> ageIsLessThan(int age) {
        return (root, criteriaBuilder) -> criteriaBuilder.lessThan(root.get("age"), age)
    }

    static UpdateSpecification<Person> setNewName(String newName) {
        return (root, query, criteriaBuilder) -> {
            query.set(root.get("name"), newName)
            null
        }
    }
}

object Specifications {

    fun nameEquals(name: String?) = PredicateSpecification<Person> { root, criteriaBuilder ->
        criteriaBuilder.equal(root.get<Any>("name"), name)
    }

    fun ageIsLessThan(age: Int) = PredicateSpecification<Person> { root, criteriaBuilder ->
        criteriaBuilder.lessThan(root.get("age"), age)
    }

    fun setNewName(newName: String) = UpdateSpecification<Person> { root, query, criteriaBuilder ->
        query.set(root.get("name"), newName)
        null
    }

    fun nameInList(names: List<String>) = where<Person> {
        root[Person::name] inList names
    }

    fun nameOrAgeMatches(name: String, age: Int) = query<Person, Person> {
        where {
            or {
               root[Person::name] eq name
               root[Person::age] eq age
            }
        }
    }

    fun nameMatches(name: String) = query<Person, Person> {
        where {
            or {
               root[Person::name] eq name
            }
        }
    }

    fun updateName(newName: String, existingName: String) = update<Person> {
        set(Person::name, newName)
        where {
            root[Person::name] eq existingName
        }
    }
    fun deleteByName(name: String) = delete<Person> {
        root[Person::name] eq name
    }
}

long recordsUpdated = personRepository.updateAll(setNewName("Steven").where(nameEquals("Denis")));

long recordsUpdated = personRepository.updateAll(setNewName("Steven").where(nameEquals("Denis")))

val recordsUpdated = personRepository.updateAll(setNewName("Steven").where(nameEquals("Denis")))

long deleteAll(PredicateSpecification<Person> spec);

long deleteAll(DeleteSpecification<Person> spec);

long deleteAll(PredicateSpecification<Person> spec)

long deleteAll(DeleteSpecification<Person> spec)

fun deleteAll(spec: PredicateSpecification<Person>?): Long

fun deleteAll(spec: DeleteSpecification<Person>?): Long

class Specifications {

    static PredicateSpecification<Person> nameEquals(String name) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get(Person_.name), name);
    }

    static PredicateSpecification<Person> longNameEquals(String longName) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get(Person_.longName), longName);
    }

    static PredicateSpecification<Person> ageIsLessThan(int age) {
        return (root, criteriaBuilder) -> criteriaBuilder.lessThan(root.get(Person_.age), age);
    }

}

class Specifications {

    static PredicateSpecification<Person> nameEquals(String name) {
        return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get("name"), name)
    }

    static PredicateSpecification<Person> ageIsLessThan(int age) {
        return (root, criteriaBuilder) -> criteriaBuilder.lessThan(root.get("age"), age)
    }

}

object Specifications {

    fun nameEquals(name: String?) = PredicateSpecification<Person> { root, criteriaBuilder ->
        criteriaBuilder.equal(root.get<Any>("name"), name)
    }

    fun ageIsLessThan(age: Int) = PredicateSpecification<Person> { root, criteriaBuilder ->
        criteriaBuilder.lessThan(root.get("age"), age)
    }

}

long recordsDeleted = personRepository.deleteAll(where(nameEquals("Denis")));

long recordsDeleted = personRepository.deleteAll(where(nameEquals("Denis")))

val recordsDeleted = personRepository.deleteAll(PredicateSpecification.where(nameEquals("Denis")))

static PredicateSpecification<Person> nameEquals(String name) {
    return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get(Person_.name), name);
}

static PredicateSpecification<Person> longNameEquals(String longName) {
    return (root, criteriaBuilder) -> criteriaBuilder.equal(root.get(Person_.longName), longName);
}

static PredicateSpecification<Person> ageIsLessThan(int age) {
    return (root, criteriaBuilder) -> criteriaBuilder.lessThan(root.get(Person_.age), age);
}

static UpdateSpecification<Person> setNewName(String newName) {
    return (root, query, criteriaBuilder) -> {
        query.set(root.get(Person_.name), newName);
        return null;
    };
}

static PredicateSpecification<Product> manufacturerNameEquals(String name) {
    return (root, cb) -> cb.equal(root.join(Product_.manufacturer).get(Manufacturer_.name), name);
}

static PredicateSpecification<Product> joined() {
    return (root, cb) -> {
        root.join("manufacturer");
        return null;
    };
}

package example;

import io.micronaut.transaction.TransactionOperations;
import jakarta.inject.Singleton;
import jakarta.persistence.EntityManager;
import org.hibernate.Session;

@Singleton
public class ProductManager {

    private final EntityManager entityManager;
    private final TransactionOperations<Session> transactionManager;

    public ProductManager(EntityManager entityManager,
                          TransactionOperations<Session> transactionManager) { // (1)
        this.entityManager = entityManager;
        this.transactionManager = transactionManager;
    }

    Product save(String name, Manufacturer manufacturer) {
        return transactionManager.executeWrite(status -> { // (2)
            final Product product = new Product(name, manufacturer);
            entityManager.persist(product);
            return product;
        });
    }

    Product find(String name) {
        return transactionManager.executeRead(status -> // (3)
            status.getConnection().createQuery("from Product p where p.name = :name", Product.class)
                .setParameter("name", name)
                .getSingleResult()
        );
    }
}

package example

import io.micronaut.transaction.TransactionOperations
import jakarta.inject.Singleton
import jakarta.persistence.EntityManager
import org.hibernate.Session

@Singleton
class ProductManager {

    private final EntityManager entityManager
    private final TransactionOperations<Session> transactionManager

    ProductManager(EntityManager entityManager,
                   TransactionOperations<Session> transactionManager) { // (1)
        this.entityManager = entityManager
        this.transactionManager = transactionManager
    }

    Product save(String name, Manufacturer manufacturer) {
        return transactionManager.executeWrite { // (2)
            Product product = new Product(name, manufacturer)
            entityManager.persist(product)
            return product
        }
    }

    Product find(String name) {
        return transactionManager.executeRead { status -> // (3)
            status.getConnection().createQuery("from Product p where p.name = :name", Product)
                    .setParameter("name", name)
                    .singleResult
        }
    }
}

package example

import io.micronaut.transaction.TransactionOperations
import jakarta.inject.Singleton
import jakarta.persistence.EntityManager
import org.hibernate.Session

@Singleton
class ProductManager(
    private val entityManager: EntityManager,
    private val transactionManager: TransactionOperations<Session> // (1)
) {

    fun save(name: String, manufacturer: Manufacturer): Product {
        return transactionManager.executeWrite { // (2)
            val product = Product(null, name, manufacturer)
            entityManager.persist(product)
            product
        }
    }

    fun find(name: String): Product {
        return transactionManager.executeRead { status ->  // (3)
            status.connection.createQuery("from Product p where p.name = :name", Product::class.java)
                .setParameter("name", name)
                .singleResult
        }
    }
}

package example;

import io.micronaut.transaction.TransactionOperations;
import jakarta.inject.Singleton;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

@Singleton
public class ProductManager {

    private final Connection connection;
    private final TransactionOperations<Connection> transactionManager;
    private final ProductRepository productRepository;

    public ProductManager(Connection connection,
                          TransactionOperations<Connection> transactionManager, // (1)
                          ProductRepository productRepository) {
        this.connection = connection;
        this.transactionManager = transactionManager;
        this.productRepository = productRepository;
    }

    Product save(String name, Manufacturer manufacturer) {
        return transactionManager.executeWrite(status -> { // (2)
            final Product product = new Product(name, manufacturer);
            try (PreparedStatement ps = connection.prepareStatement("insert into product (name, manufacturer_id) values (?, ?)")) {
                ps.setString(1, name);
                ps.setLong(2, manufacturer.getId());
                ps.execute();
            }
            return product;
        });
    }

    Product find(String name) {
        return transactionManager.executeRead(status -> { // (3)
            try (PreparedStatement ps = status.getConnection().prepareStatement("select * from product p where p.name = ?")) {
                ps.setString(1, name);
                try (ResultSet rs = ps.executeQuery()) {
                    if (rs.next()) {
                        return new Product(rs.getString("name"), null);
                    }
                    return null;
                }
            }
        });
    }

    /**
     * Creates new product using transaction operations and product repository.
     *
     * @param name the product name
     * @param manufacturer the manufacturer
     * @return the created product instance
     */
    Product saveUsingRepo(String name, Manufacturer manufacturer) {
        return transactionManager.executeWrite(status -> { // (4)
            return productRepository.save(new Product(name, manufacturer));
        });
    }

    /**
     * Finds product by name using transaction manager and product repository.
     *
     * @param name the product name
     * @return found product or null if none product found matching by name
     */
    Product findUsingRepo(String name) {
        return transactionManager.executeRead(status -> { // (5)
            return productRepository.findByName(name).orElse(null);
        });
    }
}

package example

import io.micronaut.transaction.TransactionOperations
import jakarta.inject.Singleton

import java.sql.Connection
import java.sql.PreparedStatement
import java.sql.ResultSet

@Singleton
class ProductManager {

    private final Connection connection
    private final TransactionOperations<Connection> transactionManager
    private final ProductRepository productRepository

    ProductManager(Connection connection,
                   TransactionOperations<Connection> transactionManager, // (1)
                   ProductRepository productRepository) {
        this.connection = connection
        this.transactionManager = transactionManager
        this.productRepository = productRepository
    }

    Product save(String name, Manufacturer manufacturer) {
        return transactionManager.executeWrite { // (2)
            final Product product = new Product(name, manufacturer)
            connection.prepareStatement("insert into product (name, manufacturer_id) values (?, ?)")
                    .withCloseable { PreparedStatement ps ->
                        ps.setString(1, name)
                        ps.setLong(2, manufacturer.getId())
                        ps.execute()
                    }
            return product
        }
    }

    Product find(String name) {
        return transactionManager.executeRead { status -> // (3)
            status.getConnection().prepareStatement("select * from product p where p.name = ?").withCloseable {
                PreparedStatement ps ->
                    ps.setString(1, name)
                    ps.executeQuery().withCloseable { ResultSet rs ->
                        if (rs.next()) {
                            return new Product(rs.getString("name"), null)
                        }
                        return null
                    }
            }
        }
    }

    /**
     * Creates new product using transaction operations and product repository.
     *
     * @param name the product name
     * @param manufacturer the manufacturer
     * @return the created product instance
     */
    Product saveUsingRepo(String name, Manufacturer manufacturer) {
        return transactionManager.executeWrite(status -> { // (4)
            return productRepository.save(new Product(name, manufacturer));
        })
    }

    /**
     * Finds product by name using transaction manager and product repository.
     *
     * @param name the product name
     * @return found product or null if none product found matching by name
     */
    Product findUsingRepo(String name) {
        return transactionManager.executeRead(status -> { // (5)
            return productRepository.findByName(name).orElse(null);
        })
    }
}

package example

import io.micronaut.data.exceptions.EmptyResultException
import io.micronaut.transaction.TransactionOperations
import jakarta.inject.Singleton
import java.sql.Connection

@Singleton
class ProductManager(
    private val connection: Connection,
    private val transactionManager: TransactionOperations<Connection>, // (1)
    private val productRepository: ProductRepository
) {

    fun save(name: String, manufacturer: Manufacturer): Product {
        return transactionManager.executeWrite { // (2)
            val product = Product(0, name, manufacturer)
            connection.prepareStatement("insert into product (name, manufacturer_id) values (?, ?)").use { ps ->
                ps.setString(1, name)
                ps.setLong(2, manufacturer.id!!)
                ps.execute()
            }
            product
        }
    }

    fun find(name: String): Product {
        return transactionManager.executeRead { status -> // (3)
            status.connection.prepareStatement("select * from product p where p.name = ?").use { ps ->
                    ps.setString(1, name)
                    ps.executeQuery().use { rs ->
                        if (rs.next()) {
                            return@executeRead Product(
                                rs.getLong("id"), rs.getString("name"), null
                            )
                        }
                        throw EmptyResultException()
                    }
                }
        }
    }

    fun saveUsingRepo(name: String, manufacturer: Manufacturer): Product {
        return transactionManager.executeWrite { // (4)
            productRepository.save(Product(0, name, manufacturer))
        }
    }

    fun findUsingRepo(name: String): Product? {
        return transactionManager.executeRead { status -> // (5)
            productRepository.findByName(name).orElse(null)
        }
    }
}

package example;

import io.micronaut.context.event.ApplicationEventPublisher;
import io.micronaut.transaction.annotation.TransactionalEventListener;
import jakarta.inject.Singleton;
import jakarta.transaction.Transactional;

@Singleton
public class BookManager {
    private final BookRepository bookRepository;
    private final ApplicationEventPublisher<NewBookEvent> eventPublisher;

    public BookManager(BookRepository bookRepository, ApplicationEventPublisher<NewBookEvent> eventPublisher) { // (1)
        this.bookRepository = bookRepository;
        this.eventPublisher = eventPublisher;
    }

    @Transactional
    void saveBook(String title, int pages) {
        final Book book = new Book(title, pages);
        bookRepository.save(book);
        eventPublisher.publishEvent(new NewBookEvent(book)); // (2)
    }

    @TransactionalEventListener
    void onNewBook(NewBookEvent event) {
        System.out.println("book = " + event.book); // (3)
    }

    static class NewBookEvent {
        final Book book;

        public NewBookEvent(Book book) {
            this.book = book;
        }
    }
}

package example

import io.micronaut.context.event.ApplicationEventPublisher
import io.micronaut.transaction.annotation.TransactionalEventListener
import jakarta.inject.Singleton
import jakarta.transaction.Transactional

@Singleton
class BookManager {
    private final BookRepository bookRepository
    private final ApplicationEventPublisher<NewBookEvent> eventPublisher

    BookManager(BookRepository bookRepository, ApplicationEventPublisher<NewBookEvent> eventPublisher) { // (1)
        this.bookRepository = bookRepository
        this.eventPublisher = eventPublisher
    }

    @Transactional
    void saveBook(String title, int pages) {
        final Book book = new Book(title, pages)
        bookRepository.save(book)
        eventPublisher.publishEvent(new NewBookEvent(book)) // (2)
    }

    @TransactionalEventListener
    void onNewBook(NewBookEvent event) {
        println("book = $event.book") // (3)
    }

    static class NewBookEvent {
        final Book book

        NewBookEvent(Book book) {
            this.book = book
        }
    }
}

package example

import io.micronaut.context.event.ApplicationEventPublisher
import io.micronaut.transaction.annotation.TransactionalEventListener
import jakarta.inject.Singleton
import jakarta.transaction.Transactional

@Singleton
open class BookManager(
        private val bookRepository: BookRepository, private val eventPublisher: ApplicationEventPublisher<NewBookEvent>) { // (1)

    @Transactional
    open fun saveBook(title: String, pages: Int) {
        val book = Book(0, title, pages)
        bookRepository.save(book)
        eventPublisher.publishEvent(NewBookEvent(book)) // (2)
    }

    @TransactionalEventListener
    open fun onNewBook(event: NewBookEvent) {
        println("book = ${event.book}") // (3)
    }

    class NewBookEvent(val book: Book)
}

package example;

import io.micronaut.serde.annotation.Serdeable;

import jakarta.persistence.*;

@Serdeable
@Entity
public class Book {
    @Id
    @GeneratedValue
    private Long id;
    private String title;
    private int pages;

    public Book(String title, int pages) {
        this.title = title;
        this.pages = pages;
    }

    public Book() {
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public int getPages() {
        return pages;
    }

    public void setPages(int pages) {
        this.pages = pages;
    }
}

package example

import jakarta.persistence.Entity
import jakarta.persistence.GeneratedValue
import jakarta.persistence.Id

@Entity
class Book {
    @Id
    @GeneratedValue
    Long id
    String title
    int pages

    Book(String title, int pages) {
        this.title = title
        this.pages = pages
    }

    Book() {
    }
}

package example

import jakarta.persistence.Entity
import jakarta.persistence.GeneratedValue
import jakarta.persistence.Id

@Entity
data class Book(@Id
                @GeneratedValue
                var id: Long,
                var title: String,
                var pages: Int = 0)

package example;

import io.micronaut.context.annotation.Parameter;
import io.micronaut.data.annotation.Id;
import io.micronaut.data.annotation.ParameterExpression;
import io.micronaut.data.annotation.Query;
import io.micronaut.data.annotation.QueryHint;
import io.micronaut.data.annotation.Repository;
import io.micronaut.data.model.Page;
import io.micronaut.data.model.Pageable;
import io.micronaut.data.model.Slice;
import io.micronaut.data.repository.CrudRepository;

import java.util.List;

@Repository // (1)
interface BookRepository extends CrudRepository<Book, Long> { // (2)
    Book find(String title);
}

package example

import io.micronaut.context.annotation.Executable
import io.micronaut.context.annotation.Parameter
import io.micronaut.data.annotation.*
import io.micronaut.data.model.*
import io.micronaut.data.repository.CrudRepository

@Repository // (1)
interface BookRepository extends CrudRepository<Book, Long> { // (2)
    @Executable
    Book find(String title)
}

package example

import io.micronaut.context.annotation.Executable
import io.micronaut.context.annotation.Parameter
import io.micronaut.data.annotation.*
import io.micronaut.data.model.*
import io.micronaut.data.repository.CrudRepository

@Repository // (1)
interface BookRepository : CrudRepository<Book, Long> { // (2)
    @Executable
    fun find(title: String): Book
}

@Inject
BookRepository bookRepository;

@Inject BookRepository bookRepository

@Inject
lateinit var bookRepository: BookRepository

import jakarta.persistence.*;

@Entity
class Product {

    @Id
    @GeneratedValue
    private Long id;
    private String name;
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private Manufacturer manufacturer;

    public Product(String name, Manufacturer manufacturer) {
        this.name = name;
        this.manufacturer = manufacturer;
    }

    public Product() {
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Manufacturer getManufacturer() {
        return manufacturer;
    }

    public void setManufacturer(Manufacturer manufacturer) {
        this.manufacturer = manufacturer;
    }
}

import jakarta.persistence.*

@Entity
class Product {

    @Id
    @GeneratedValue
    Long id
    String name
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    Manufacturer manufacturer

    Product(String name, Manufacturer manufacturer) {
        this.name = name
        this.manufacturer = manufacturer
    }

    Product() {
    }
}

import jakarta.persistence.*

@Entity
data class Product(

    @Id
    @GeneratedValue
    var id: Long?,
    var name: String,
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    var manufacturer: Manufacturer
)

package example;

import io.micronaut.configuration.hibernate.jpa.proxy.GenerateProxy;
import org.hibernate.annotations.BatchSize;

import jakarta.persistence.*;

@Entity
@GenerateProxy
@BatchSize(size = 10)
public class Manufacturer {
    @Id
    @GeneratedValue
    private Long id;
    private String name;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

package example

import jakarta.persistence.*

@Entity
class Manufacturer {

    @Id
    @GeneratedValue
    Long id
    String name
}

package example

import jakarta.persistence.*

@Entity
data class Manufacturer(
    @Id
    @GeneratedValue
    var id: Long?,
    var name: String
)

@Repository
public interface ProductRepository extends CrudRepository<Product, Long>, JpaSpecificationExecutor<Product> {
    @Join(value = "manufacturer", type = Join.Type.FETCH) // (1)
    List<Product> list();
}

@Repository
abstract class ProductRepository implements CrudRepository<Product, Long>, JpaSpecificationExecutor<Product> {
    @Join(value = "manufacturer", type = Join.Type.FETCH) // (1)
    abstract List<Product> list()
}

@Repository
interface ProductRepository : CrudRepository<Product, Long>, JpaSpecificationExecutor<Product> {
    @Join(value = "manufacturer", type = Join.Type.FETCH) // (1)
    fun list(): List<Product>
}

@Query("FROM Book b WHERE b.title = :t ORDER BY b.title")
List<Book> listBooks(String t);

@Query("FROM Book b WHERE b.title = :t ORDER BY b.title")
List<Book> listBooks(String t)

@Query("FROM Book b WHERE b.title = :t ORDER BY b.title")
fun listBooks(t: String): List<Book>

@Query(value = "select * from books b where b.title like :title limit 5",
       nativeQuery = true)
List<Book> findNativeBooks(String title);

@Query(value = "select * from books b where b.title like :title limit 5",
        nativeQuery = true)
List<Book> findNativeBooks(String title)

@Query(value = "select * from books b where b.title like :title limit 5", nativeQuery = true)
fun findNativeBooks(title: String): List<Book>

@Repository
public interface ProductRepository extends CrudRepository<Product, Long>, JpaSpecificationExecutor<Product> {
    @Procedure(named = "calculateSum")
    long calculateSum(Long productId); // (1)

    @Procedure("calculateSumInternal")
    long calculateSumCustom(Long productId); // (2)
}

@Repository
abstract class ProductRepository implements CrudRepository<Product, Long>, JpaSpecificationExecutor<Product> {
    @Procedure(named = "calculateSum")
    abstract long calculateSum(Long productId);

    @Procedure("calculateSumInternal")
    abstract long calculateSumCustom(Long productId);
}

@Repository
interface ProductRepository : CrudRepository<Product, Long>, JpaSpecificationExecutor<Product> {
    @Procedure(named = "calculateSum")
    fun calculateSum(productId: Long): Long

    @Procedure("calculateSumInternal")
    fun calculateSumCustom(productId: Long): Long
}

import jakarta.persistence.*;

@NamedStoredProcedureQuery(name = "calculateSum",
    procedureName = "calculateSumInternal",
    parameters = {
        @StoredProcedureParameter(name = "productId", mode = ParameterMode.IN, type = Long.class),
        @StoredProcedureParameter(name = "result", mode = ParameterMode.OUT, type = Long.class)
    }
)
@Entity
class Product {

import jakarta.persistence.*

@NamedStoredProcedureQuery(name = "calculateSum",
        procedureName = "calculateSumInternal",
        parameters = [
            @StoredProcedureParameter(name = "productId", mode = ParameterMode.IN, type = Long.class),
            @StoredProcedureParameter(name = "result", mode = ParameterMode.OUT, type = Long.class)
        ]
)
@Entity
class Product {

import jakarta.persistence.*

@NamedStoredProcedureQuery(
    name = "calculateSum",
    procedureName = "calculateSumInternal",
    parameters = [StoredProcedureParameter(
        name = "productId",
        mode = ParameterMode.IN,
        type = Long::class
    ), StoredProcedureParameter(name = "result", mode = ParameterMode.OUT, type = Long::class)]
)
@Entity
data class Product(

@Repository // (1)
interface BookRepository extends ReactorCrudRepository<Book, Long> { // (2)

    Mono<Book> find(String title);

    Mono<BookDTO> findOne(String title);

    Flux<Book> findByPagesGreaterThan(int pageCount, Pageable pageable);

    Mono<Page<Book>> findByTitleLike(String title, Pageable pageable);

    Mono<Slice<Book>> list(Pageable pageable);

    @Transactional
    default Mono<Void> findByIdAndUpdate(Long id, Consumer<Book> bookConsumer) {
        return findById(id).map(book -> {
            bookConsumer.accept(book);
            return book;
        }).then();
    }

    @Override
    Mono<Book> save(Book entity);

    @Override
    Mono<Book> update(Book newBook);

    Mono<Void> update(@Id Long id, int pages);

    @Override
    Mono<Long> deleteAll();

    Mono<Void> delete(String title);
}

@Repository // (1)
abstract class BookRepository implements ReactorCrudRepository<Book, Long> { // (2)

    abstract Mono<Book> find(String title);

    abstract Mono<Page<Book>> findByTitleLike(String title, Pageable pageable);

    abstract Mono<BookDTO> findOne(String title);

    abstract Flux<Book> findByPagesGreaterThan(int pageCount, Pageable pageable);

    abstract Mono<Slice<Book>> list(Pageable pageable);

    abstract Mono<Book> save(Book entity);

    @Transactional
    Mono<Void> findByIdAndUpdate(Long id, Consumer<Book> bookConsumer) {
        return findById(id).map(book -> {
            bookConsumer.accept(book)
            return book
        }).then()
    }

    abstract Mono<Book> update(Book newBook);

    abstract Mono<Void> update(@Id Long id, int pages);

    @Override
    abstract Mono<Long> deleteAll();

    abstract Mono<Void> delete(String title);
}

@Repository // (1)
interface BookRepository : CoroutineCrudRepository<Book, Long> { // (2)

    suspend fun find(title: String): Book

    suspend fun findOne(title: String): BookDTO

    suspend fun findByPagesGreaterThan(pageCount: Int, pageable: Pageable): List<Book>

    suspend fun findByTitleLike(title: String, pageable: Pageable): Page<Book>

    suspend fun list(pageable: Pageable): Slice<Book>

    suspend fun save(entity: Book): Book

    @Query("INSERT INTO Book(title, pages) VALUES (:title, :pages)")
    suspend fun insert(title: String, pages: Int)

    @Transactional
    suspend fun findByIdAndUpdate(id: Long, bookConsumer: Consumer<Book?>) {
        bookConsumer.accept(findById(id))
    }

    suspend fun update(newBook: Book): Book

    suspend fun update(@Id id: Long?, pages: Int)

    suspend fun delete(title: String)
}

package example;

import jakarta.persistence.*;

import java.util.HashSet;
import java.util.Set;

@Entity
public class Book {
    @Id
    @GeneratedValue
    private Long id;
    private String title;
    private int pages;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "book")
    private Set<Review> reviews;

    public Book(String title, int pages) {
        this(title, pages, Set.of());
    }

    public Book(String title, int pages, Set<Review> reviews) {
        this.title = title;
        this.pages = pages;
        this.reviews = reviews;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public int getPages() {
        return pages;
    }

    public Set<Review> getReviews() {
        return reviews;
    }

    public void setReviews(Set<Review> reviews) {
        this.reviews = reviews;
    }
}

package example

import jakarta.persistence.*

@Entity
class Book {
    @Id
    @GeneratedValue
    Long id
    private String title
    private int pages
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "book")
    private Set<Review> reviews

    Book(String title, int pages) {
        this(title, pages, Set.of())
    }

    Book(String title, int pages, Set<Review> reviews) {
        this.title = title
        this.pages = pages
        this.reviews = reviews
    }

    String getTitle() {
        return title
    }

    int getPages() {
        return pages
    }

    Set<Review> getReviews() {
        return reviews
    }

    void setReviews(Set<Review> reviews) {
        this.reviews = reviews
    }
}

package example

import io.micronaut.data.annotation.Relation
import jakarta.persistence.Entity
import jakarta.persistence.GeneratedValue
import jakarta.persistence.Id

@Entity
data class Book(@Id
                @GeneratedValue
                val id: Long,
                val title: String,
                val pages: Int = 0,
                @Relation(value = Relation.Kind.ONE_TO_MANY, mappedBy = "book", cascade = [Relation.Cascade.ALL])
                val reviews: Set<Review>) {
    constructor(id: Long, title: String, pages: Int) : this(id, title, pages, setOf()) {
    }
}

package example;

import io.micronaut.core.annotation.NonNull;
import io.micronaut.data.annotation.*;
import io.micronaut.data.annotation.sql.Procedure;
import io.micronaut.data.jdbc.annotation.JdbcRepository;
import io.micronaut.data.model.*;
import io.micronaut.data.model.query.builder.sql.Dialect;
import io.micronaut.data.repository.CrudRepository;
import java.util.List;


@JdbcRepository(dialect = Dialect.H2)        // (1)
interface BookRepository extends CrudRepository<Book, Long> { // (2)
    Book find(String title);
}

package example

import io.micronaut.core.annotation.NonNull
import io.micronaut.data.annotation.*
import io.micronaut.data.annotation.sql.Procedure
import io.micronaut.data.jdbc.annotation.JdbcRepository
import io.micronaut.data.model.*
import io.micronaut.data.model.query.builder.sql.Dialect
import io.micronaut.data.repository.CrudRepository
import java.util.List


@JdbcRepository(dialect = Dialect.H2)        // (1)
interface BookRepository extends CrudRepository<Book, Long> { // (2)
    Book find(String title);
}

package example

import io.micronaut.context.annotation.Executable
import io.micronaut.core.annotation.NonNull
import io.micronaut.data.annotation.Id
import io.micronaut.data.annotation.Join
import io.micronaut.data.annotation.Query
import io.micronaut.data.annotation.sql.Procedure
import io.micronaut.data.jdbc.annotation.JdbcRepository
import io.micronaut.data.model.*
import io.micronaut.data.model.query.builder.sql.Dialect
import io.micronaut.data.repository.CrudRepository
import jakarta.transaction.Transactional

@JdbcRepository(dialect = Dialect.H2) // (1)
interface BookRepository : CrudRepository<Book, Long> { // (2)
    @Executable
    fun find(title: String): Book
}

@Inject BookRepository bookRepository;

@Inject @Shared BookRepository bookRepository

@Inject
lateinit var bookRepository: BookRepository

package example;

import io.micronaut.data.annotation.*;
import io.micronaut.serde.annotation.Serdeable;

@Serdeable
@MappedEntity
public class Author {
    @GeneratedValue
    @Id
    private Long id;
    private final String name;

    public Author(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }
}

package example

import io.micronaut.data.annotation.*
import io.micronaut.serde.annotation.Serdeable

@Serdeable
@MappedEntity
class Author {
    @GeneratedValue
    @Id
    Long id
    final String name

    Author(String name) {
        this.name = name
    }
}

package example

import io.micronaut.data.annotation.GeneratedValue
import io.micronaut.data.annotation.Id
import io.micronaut.data.annotation.MappedEntity
import io.micronaut.serde.annotation.Serdeable

@Serdeable
@MappedEntity
data class Author(val name: String) {
    @GeneratedValue
    @Id
    var id: Long? = null
}

package example;

import io.micronaut.core.annotation.NonNull;
import io.micronaut.data.model.query.builder.sql.Dialect;
import io.micronaut.data.r2dbc.annotation.R2dbcRepository;
import io.micronaut.data.repository.reactive.ReactiveStreamsCrudRepository;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import jakarta.validation.constraints.NotNull;

@R2dbcRepository(dialect = Dialect.POSTGRES) // (1)
public interface AuthorRepository extends ReactiveStreamsCrudRepository<Author, Long> {
    @NonNull
    @Override
    Mono<Author> findById(@NonNull @NotNull Long aLong); // (2)

    @NonNull
    @Override
    Flux<Author> findAll();
}

package example

import io.micronaut.core.annotation.NonNull
import io.micronaut.data.model.query.builder.sql.Dialect
import io.micronaut.data.r2dbc.annotation.R2dbcRepository
import io.micronaut.data.repository.reactive.ReactiveStreamsCrudRepository
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono

import jakarta.validation.constraints.NotNull

@R2dbcRepository(dialect = Dialect.POSTGRES) // (1)
interface AuthorRepository extends ReactiveStreamsCrudRepository<Author, Long> {
    @NonNull
    @Override
    Mono<Author> findById(@NonNull @NotNull Long aLong) // (2)

    @NonNull
    @Override
    Flux<Author> findAll()
}

package example

import io.micronaut.data.model.query.builder.sql.Dialect
import io.micronaut.data.r2dbc.annotation.R2dbcRepository
import io.micronaut.data.repository.reactive.ReactiveStreamsCrudRepository
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono
import jakarta.validation.constraints.NotNull

@R2dbcRepository(dialect = Dialect.MYSQL) // (1)
interface AuthorRepository : ReactiveStreamsCrudRepository<Author, Long> {
    override fun findById(id: @NotNull Long): Mono<Author> // (2)
    override fun findAll(): Flux<Author>
}

package example;

import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Get;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@Controller("/authors")
public class AuthorController {
    private final AuthorRepository repository;

    public AuthorController(AuthorRepository repository) {
        this.repository = repository;
    }

    @Get
    Flux<Author> all() { // (1)
        return repository.findAll();
    }

    @Get("/id")
    Mono<Author> get(Long id) { // (2)
        return repository.findById(id);
    }
}

package example

import io.micronaut.http.annotation.Controller
import io.micronaut.http.annotation.Get
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono

@Controller("/authors")
class AuthorController {
    private final AuthorRepository repository

    AuthorController(AuthorRepository repository) {
        this.repository = repository
    }

    @Get
    Flux<Author> all() { // (1)
        return repository.findAll()
    }

    @Get("/id")
    Mono<Author> get(Long id) { // (2)
        return repository.findById(id)
    }
}

package example

import io.micronaut.http.annotation.Controller
import io.micronaut.http.annotation.Get
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono

@Controller("/authors")
class AuthorController(private val repository: AuthorRepository) {
    @Get
    fun all(): Flux<Author> { // (1)
        return repository.findAll()
    }

    @Get("/id")
    fun get(id: Long): Mono<Author> { // (2)
        return repository.findById(id)
    }
}

package example;

import reactor.core.publisher.Mono;

import jakarta.inject.Singleton;
import jakarta.transaction.Transactional;
import java.util.Arrays;

@Singleton
public class AuthorService {
    private final AuthorRepository authorRepository;
    private final BookRepository bookRepository;

    public AuthorService(AuthorRepository authorRepository, BookRepository bookRepository) { // (1)
        this.authorRepository = authorRepository;
        this.bookRepository = bookRepository;
    }

    @Transactional // (2)
    Mono<Void> setupData() {
        return Mono.from(authorRepository.save(new Author("Stephen King")))
                .flatMapMany((author -> bookRepository.saveAll(Arrays.asList(
                        new Book("The Stand", 1000, author),
                        new Book("The Shining", 400, author)
                ))))
                .then(Mono.from(authorRepository.save(new Author("James Patterson"))))
                .flatMapMany((author ->
                        bookRepository.save(new Book("Along Came a Spider", 300, author))
                )).then();
    }
}

package example

import reactor.core.publisher.Mono

import jakarta.inject.Singleton
import jakarta.transaction.Transactional

@Singleton
class AuthorService {
    private final AuthorRepository authorRepository
    private final BookRepository bookRepository

    AuthorService(AuthorRepository authorRepository, BookRepository bookRepository) { // (1)
        this.authorRepository = authorRepository
        this.bookRepository = bookRepository
    }

    @Transactional // (2)
    Mono<Void> setupData() {
        return Mono.from(authorRepository.save(new Author("Stephen King")))
                .flatMapMany((author -> bookRepository.saveAll([
                        new Book("The Stand", 1000, author),
                        new Book("The Shining", 400, author)
                ])))
                .then(Mono.from(authorRepository.save(new Author("James Patterson"))))
                .flatMapMany((author ->
                        bookRepository.save(new Book("Along Came a Spider", 300, author))
                )).then()
    }
}

package example

import reactor.core.publisher.Mono
import jakarta.inject.Singleton
import jakarta.transaction.Transactional

@Singleton
open class AuthorService(
        private val authorRepository: AuthorRepository,
        private val bookRepository: BookReactiveRepository) { // (1)

    @Transactional // (2)
    open fun setupData(): Mono<Void> {
        return Mono.from(authorRepository.save(Author("Stephen King")))
                .flatMapMany { author: Author ->
                    bookRepository.saveAll(listOf(
                            Book("The Stand", 1000, author),
                            Book("The Shining", 400, author)
                    ))
                }
                .then(Mono.from(authorRepository.save(Author("James Patterson"))))
                .flatMapMany { author: Author ->
                    bookRepository.save(Book("Along Came a Spider", 300, author))
                }.then()
    }
}

Flux.from(operations.withTransaction(status ->
    Flux.from(authorRepository.save(new Author("Stephen King")))
            .flatMap((author -> bookRepository.saveAll(Arrays.asList(
                    new Book("The Stand", 1000, author),
                    new Book("The Shining", 400, author)
            ))))
    .thenMany(Flux.from(authorRepository.save(new Author("James Patterson"))))
        .flatMap((author ->
                bookRepository.save(new Book("Along Came a Spider", 300, author))
    )).then()
)).collectList().block();

Flux.from(operations.withTransaction(status ->
        Flux.from(authorRepository.save(new Author("Stephen King")))
                .flatMap((author -> bookRepository.saveAll([
                        new Book("The Stand", 1000, author),
                        new Book("The Shining", 400, author)
                ])))
                .thenMany(Flux.from(authorRepository.save(new Author("James Patterson"))))
                .flatMap((author ->
                        bookRepository.save(new Book("Along Came a Spider", 300, author))
                )).then()
)).collectList().block()

Flux.from(operations.withTransaction {
    Flux.from(authorRepository.save(Author("Stephen King")))
            .flatMap { author: Author ->
                bookRepository.saveAll(listOf(
                        Book("The Stand", 1000, author),
                        Book("The Shining", 400, author)
                ))
            }
            .thenMany(Flux.from(authorRepository.save(Author("James Patterson"))))
            .flatMap { author: Author -> bookRepository.save(Book("Along Came a Spider", 300, author)) }.then()
}).collectList().block()

@NonNull
@Override
@Transactional(Transactional.TxType.MANDATORY)
<S extends Book> Publisher<S> save(@NonNull @Valid @NotNull S entity);

@NonNull
@Override
@Transactional(Transactional.TxType.MANDATORY)
<S extends Book> Publisher<S> saveAll(@NonNull @Valid @NotNull Iterable<S> entities);

@NonNull
@Override
@Transactional(Transactional.TxType.MANDATORY)
<S extends Book> Publisher<S> save(@NonNull @Valid @NotNull S entity);

@NonNull
@Override
@Transactional(Transactional.TxType.MANDATORY)
<S extends Book> Publisher<S> saveAll(@NonNull @Valid @NotNull Iterable<S> entities);

@Transactional(Transactional.TxType.MANDATORY)
override suspend fun <S : Book> save(entity: S): S

@Transactional(Transactional.TxType.MANDATORY)
override fun <S : Book> saveAll(entities: Iterable<S>): Flow<S>

Flux.from(operations.withTransaction(status -> // (1)
        Flux.from(authorRepository.save(new Author("Michael Crichton")))
                .flatMap((author -> operations.withTransaction(status, (s) -> // (2)
                        bookRepository.saveAll(Arrays.asList(
                                new Book("Jurassic Park", 300, author),
                                new Book("Disclosure", 400, author)
                        )))))
)).collectList().block();

Flux.from(operations.withTransaction(status -> // (1)
        Flux.from(authorRepository.save(new Author("Michael Crichton")))
                .flatMap((author -> operations.withTransaction(status, (s) -> // (2)
                        bookRepository.saveAll([
                                new Book("Jurassic Park", 300, author),
                                new Book("Disclosure", 400, author)
                        ]))))
)).collectList().block()

Flux.from(operations.withTransaction { status: ReactiveTransactionStatus<Connection> ->  // (1)
    Flux.from(authorRepository.save(Author("Michael Crichton")))
            .flatMap { author: Author ->
                operations.withTransaction(status) {   // (2)
                    bookRepository.saveAll(listOf(
                            Book("Jurassic Park", 300, author),
                            Book("Disclosure", 400, author)
                    ))
                }
            }
}).collectList().block()

package example;

import io.micronaut.data.jdbc.annotation.JdbcRepository;
import io.micronaut.data.jdbc.runtime.JdbcOperations;
import io.micronaut.data.model.query.builder.sql.Dialect;
import io.micronaut.data.repository.CrudRepository;

import jakarta.transaction.Transactional;
import java.sql.ResultSet;
import java.util.List;
import java.util.stream.Collectors;

@JdbcRepository(dialect = Dialect.H2)
public abstract class AbstractBookRepository implements CrudRepository<Book, Long> {

    private final JdbcOperations jdbcOperations;

    public AbstractBookRepository(JdbcOperations jdbcOperations) {
        this.jdbcOperations = jdbcOperations;
    }

    @Transactional
    public List<Book> findByTitle(String title) {
        String sql = "SELECT * FROM Book AS book WHERE book.title = ?";
        return jdbcOperations.prepareStatement(sql, statement -> {
            statement.setString(1, title);
            ResultSet resultSet = statement.executeQuery();
            return jdbcOperations.entityStream(resultSet, Book.class).toList();
        });
    }
}

package example

import io.micronaut.data.jdbc.annotation.JdbcRepository
import io.micronaut.data.jdbc.runtime.JdbcOperations
import io.micronaut.data.model.query.builder.sql.Dialect
import io.micronaut.data.repository.CrudRepository

import jakarta.transaction.Transactional
import java.sql.ResultSet
import java.util.stream.Collectors

@JdbcRepository(dialect = Dialect.H2)
abstract class AbstractBookRepository implements CrudRepository<Book, Long> {

    private final JdbcOperations jdbcOperations

    AbstractBookRepository(JdbcOperations jdbcOperations) {
        this.jdbcOperations = jdbcOperations
    }

    @Transactional
    List<Book> findByTitle(String title) {
        String sql = "SELECT * FROM Book AS book WHERE book.title = ?"
        return jdbcOperations.prepareStatement(sql,  { statement ->
            statement.setString(1, title)
            ResultSet resultSet = statement.executeQuery()
            return jdbcOperations.entityStream(resultSet, Book.class)
                    .toList()
        })
    }
}

package example

import io.micronaut.data.annotation.Repository
import io.micronaut.data.jdbc.runtime.JdbcOperations
import io.micronaut.data.repository.CrudRepository

import jakarta.transaction.Transactional
import kotlin.streams.toList

@Repository
abstract class AbstractBookRepository(private val jdbcOperations: JdbcOperations) : CrudRepository<Book, Long> {

    @Transactional
    open fun findByTitle(title: String): List<Book> {
        val sql = "SELECT * FROM Book AS book WHERE book.title = ?"
        return jdbcOperations.prepareStatement(sql) { statement ->
            statement.setString(1, title)
            val resultSet = statement.executeQuery()
            jdbcOperations.entityStream(resultSet, Book::class.java)
                    .toList()
        }
    }
}

@JdbcRepository(dialect = Dialect.H2)
public abstract class AbstractBookRepository implements CrudRepository<@Valid Book, @NotNull Long> {

    private final JdbcTemplate jdbcTemplate;

    public AbstractBookRepository(DataSource dataSource) { // (1)
        this.jdbcTemplate = new JdbcTemplate(DelegatingDataSource.unwrapDataSource(dataSource)); //(2)
    }

    @Transactional
    public List<Book> findByTitle(@NonNull @NotNull String title) {
        return jdbcTemplate.queryForList("SELECT * FROM Book AS book WHERE book.title = ?", title) // (3)
            .stream()
            .map(m -> new Book((Long) m.get("id"), (String) m.get("title"), (Integer) m.get("pages")))
            .toList();
    }
}

@JdbcRepository(dialect = Dialect.H2)
abstract class AbstractBookRepository implements CrudRepository<@Valid Book, @NotNull Long> {

    private final JdbcTemplate jdbcTemplate;

    AbstractBookRepository(DataSource dataSource) { // (1)
        this.jdbcTemplate = new JdbcTemplate(DelegatingDataSource.unwrapDataSource(dataSource)); //(2)
    }

    @Transactional
    List<Book> findByTitle(@NonNull @NotNull String title) {
        return jdbcTemplate.queryForList('SELECT * FROM Book AS book WHERE book.title = ?', title) // (3)
            .collect(m -> new Book(m.id as Long, m.title as String, m.pages as Integer))
    }
}

@JdbcRepository(dialect = Dialect.H2)
abstract class AbstractBookRepository(dataSource: DataSource) : CrudRepository<@Valid Book, Long> { // (1)

    private val jdbcTemplate: JdbcTemplate = JdbcTemplate(DelegatingDataSource.unwrapDataSource(dataSource)) //(2)

    @Transactional
    open fun findByTitle(title: String) = jdbcTemplate
        .queryForList("SELECT * FROM Book AS book WHERE book.title = ?", title) // (3)
        .map { m -> Book(m["id"] as Long, m["title"] as String, m["pages"] as Int) }
}

void update(@Id Long id, int pages);

void update(@Id Long id, String title);

void update(@Id Long id, int pages);

void update(@Id Long id, String title);

fun update(@Id id: Long?, pages: Int)

fun update(@Id id: Long?, title: String)

@Entity
public class Student {

    @Id
    @GeneratedValue
    private Long id;
    @Version
    private Long version;

@Entity
class Student {

    @Id
    @GeneratedValue
    Long id
    @Version
    Long version

@Entity
data class Student(
        @Id @GeneratedValue
        var id: Long?,
        @Version
        val version: Long,

@Repository
public interface StudentRepository extends CrudRepository<Student, Long> {

    void update(@Id Long id, @Version Long version, String name);

    void delete(@Id Long id, @Version Long version);
}

@Repository
interface StudentRepository extends CrudRepository<Student, Long> {

    void update(@Id Long id, @Version Long version, String name)

    void delete(@Id Long id, @Version Long version)
}

@Repository
interface StudentRepository : CrudRepository<Student, Long> {

    fun update(@Id id: Long, @Version version: Long, name: String)

    fun delete(@Id id: Long, @Version version: Long)

}

package example;

import jakarta.persistence.Embeddable;
import java.util.Objects;

@Embeddable
public class ProjectId {
    private final int departmentId;
    private final int projectId;

    public ProjectId(int departmentId, int projectId) {
        this.departmentId = departmentId;
        this.projectId = projectId;
    }

    public int getDepartmentId() {
        return departmentId;
    }

    public int getProjectId() {
        return projectId;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        ProjectId projectId1 = (ProjectId) o;
        return departmentId == projectId1.departmentId &&
                projectId == projectId1.projectId;
    }

    @Override
    public int hashCode() {
        return Objects.hash(departmentId, projectId);
    }
}

package example

import groovy.transform.EqualsAndHashCode
import jakarta.persistence.Embeddable

@EqualsAndHashCode
@Embeddable
class ProjectId {
    final int departmentId
    final int projectId

    ProjectId(int departmentId, int projectId) {
        this.departmentId = departmentId
        this.projectId = projectId
    }
}

package example

import jakarta.persistence.Embeddable

@Embeddable
data class ProjectId(val departmentId: Int, val projectId: Int)

package example;

import jakarta.persistence.EmbeddedId;
import jakarta.persistence.Entity;

@Entity
public class Project {
    @EmbeddedId
    private ProjectId projectId;
    private String name;

    public Project(ProjectId projectId, String name) {
        this.projectId = projectId;
        this.name = name;
    }

    public ProjectId getProjectId() {
        return projectId;
    }

    public String getName() {
        return name;
    }
}

package example

import jakarta.persistence.EmbeddedId
import jakarta.persistence.Entity

@Entity
class Project {
    @EmbeddedId
    private ProjectId projectId
    private String name

    Project(ProjectId projectId, String name) {
        this.projectId = projectId
        this.name = name
    }

    ProjectId getProjectId() {
        return projectId
    }

    String getName() {
        return name
    }
}

package example

import jakarta.persistence.EmbeddedId
import jakarta.persistence.Entity

@Entity
class Project(
    @EmbeddedId val projectId: ProjectId,
    val name: String
)

package example;

import io.micronaut.core.annotation.Creator;

import jakarta.persistence.*;

@Entity
public class Manufacturer {
    @Id
    @GeneratedValue
    private Long id;
    private String name;

    @Creator
    public Manufacturer(String name) {
        this.name = name;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

}

package example

import io.micronaut.core.annotation.Creator

import jakarta.persistence.*

@Entity
class Manufacturer {
    @Id
    @GeneratedValue
    Long id
    final String name

    @Creator
    Manufacturer(String name) {
        this.name = name
    }
}

package example

import jakarta.persistence.*

@Entity
data class Manufacturer(
    @Id
    @GeneratedValue
    var id: Long?,
    val name: String
)

package example;

import jakarta.persistence.*;

@Entity
public class Product {

    @Id
    @GeneratedValue
    private Long id;
    private String name;
    @ManyToOne
    private Manufacturer manufacturer;

    public Product(String name, Manufacturer manufacturer) {
        this.name = name;
        this.manufacturer = manufacturer;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public Manufacturer getManufacturer() {
        return manufacturer;
    }
}

package example

import jakarta.persistence.*

@Entity
class Product {

    @Id
    @GeneratedValue
    Long id
    private String name
    @ManyToOne
    private Manufacturer manufacturer

    Product(String name, Manufacturer manufacturer) {
        this.name = name
        this.manufacturer = manufacturer
    }

    String getName() {
        return name
    }

    Manufacturer getManufacturer() {
        return manufacturer
    }
}

package example

import jakarta.persistence.*

@Entity
data class Product(
    @Id
    @GeneratedValue
    var id: Long?,
    var name: String,
    @ManyToOne
    var manufacturer: Manufacturer?
)

package example;

import io.micronaut.data.annotation.Id;
import io.micronaut.data.annotation.MappedProperty;
import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;


@Entity
public class Person {
    @Id
    @GeneratedValue
    private Long id;
    private String name;
    private int age;
    @MappedProperty(value = "long_name_column_legacy_system", alias = "long_name")
    private String longName;

    public Person() {
    }

    public Person(String name, int age, String longName) {
        this(null, name, age, longName);
    }

    public Person(Long id, String name, int age, String longName) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.longName = longName;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getLongName() {
        return longName;
    }

    public void setLongName(String longName) {
        this.longName = longName;
    }
}

package example

import io.micronaut.data.annotation.Id
import jakarta.persistence.Entity
import jakarta.persistence.GeneratedValue


@Entity
class Person {
    @Id
    @GeneratedValue
    private Long id
    private String name
    private int age

    Person() {
    }

    Person(String name, int age) {
        this(null, name, age)
    }

    Person(Long id, String name, int age) {
        this.id = id
        this.name = name
        this.age = age
    }

    Long getId() {
        return id
    }

    void setId(Long id) {
        this.id = id
    }

    String getName() {
        return name
    }

    void setName(String name) {
        this.name = name
    }

    int getAge() {
        return age
    }

    void setAge(int age) {
        this.age = age
    }
}

package example

import io.micronaut.data.annotation.Id
import jakarta.persistence.Entity
import jakarta.persistence.GeneratedValue

@Entity
class Person {
    @Id
    @GeneratedValue
    var id: Long? = null
    var name: String? = null
    var age = 0

    constructor(name: String?, age: Int) : this(null, name, age) {}
    constructor(id: Long?, name: String?, age: Int) {
        this.id = id
        this.name = name
        this.age = age
    }
}

package example;

import io.micronaut.core.annotation.Nullable;
import io.micronaut.data.annotation.*;
import java.util.Date;

@MappedEntity // (1)
record Book(
        @Id @GeneratedValue @Nullable Long id, // (2)
        @DateCreated @Nullable Date dateCreated,
        String title,
        int pages) {
}

Book book = new Book(null,null, "The Stand", 1000);
book = bookRepository.save(book);

package example;

import jakarta.persistence.*;

@Entity
public class Sale {

    @ManyToOne
    private final Product product;
    private final Quantity quantity;

    @Id
    @GeneratedValue
    private Long id;

    public Sale(Product product, Quantity quantity) {
        this.product = product;
        this.quantity = quantity;
    }

    public Product getProduct() {
        return product;
    }

    public Quantity getQuantity() {
        return quantity;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }
}

package example

import jakarta.persistence.Id
import jakarta.persistence.Entity
import jakarta.persistence.ManyToOne
import jakarta.persistence.GeneratedValue

@Entity
class Sale {

    @ManyToOne
    final Product product

    final Quantity quantity

    @Id
    @GeneratedValue
    Long id

    Sale(Product product, Quantity quantity) {
        this.product = product
        this.quantity = quantity
    }
}

package example

import jakarta.persistence.*

@Entity
data class Sale(
    @Id
    @GeneratedValue
    var id: Long?,
    @ManyToOne
    val product: Product,
    val quantity: Quantity
)

package example;

import io.micronaut.data.annotation.TypeDef;
import io.micronaut.data.model.DataType;

@TypeDef(type = DataType.INTEGER, converter = QuantityAttributeConverter.class)
public class Quantity {

    private final int amount;

    private Quantity(int amount) {
        this.amount = amount;
    }

    public int getAmount() {
        return amount;
    }

    public static Quantity valueOf(int amount) {
        return new Quantity(amount);
    }
}

package example

import groovy.transform.Immutable
import io.micronaut.data.annotation.TypeDef
import io.micronaut.data.model.DataType

@TypeDef(type = DataType.INTEGER, converter = QuantityAttributeConverter.class)
@Immutable
class Quantity {
    int amount
}

package example

import io.micronaut.data.annotation.TypeDef
import io.micronaut.data.model.DataType

@TypeDef(type = DataType.INTEGER, converter = QuantityAttributeConverter::class)
data class Quantity(val amount: Int)

package example;

import io.micronaut.core.convert.ConversionContext;
import io.micronaut.data.model.runtime.convert.AttributeConverter;
import jakarta.inject.Singleton;

@Singleton // (1)
public class QuantityAttributeConverter implements AttributeConverter<Quantity, Integer> {

    @Override // (2)
    public Integer convertToPersistedValue(Quantity quantity, ConversionContext context) {
        return quantity == null ? null : quantity.getAmount();
    }

    @Override // (3)
    public Quantity convertToEntityValue(Integer value, ConversionContext context) {
        return value == null ? null : Quantity.valueOf(value);
    }

}

package example

import groovy.transform.CompileStatic
import io.micronaut.core.convert.ConversionContext
import io.micronaut.data.model.runtime.convert.AttributeConverter
import jakarta.inject.Singleton

@Singleton // (1)
@CompileStatic
class QuantityAttributeConverter implements AttributeConverter<Quantity, Integer> {

    @Override // (2)
    Integer convertToPersistedValue(Quantity quantity, ConversionContext context) {
        return quantity == null ? null : quantity.getAmount()
    }

    @Override // (3)
    Quantity convertToEntityValue(Integer value, ConversionContext context) {
        return value == null ? null : new Quantity(value)
    }

}

package example

import io.micronaut.core.convert.ConversionContext
import io.micronaut.data.model.runtime.convert.AttributeConverter
import jakarta.inject.Singleton

@Singleton // (1)
class QuantityAttributeConverter : AttributeConverter<Quantity?, Int?> {

    // (2)
    override fun convertToPersistedValue(quantity: Quantity?, context: ConversionContext): Int? {
        return quantity?.amount
    }

    // (3)
    override fun convertToEntityValue(value: Int?, context: ConversionContext): Quantity? {
        return if (value == null) null else Quantity(value)
    }

}

package example;

import io.micronaut.core.annotation.Creator;

import jakarta.persistence.*;

@Entity
public class Manufacturer {
    @Id
    @GeneratedValue
    private Long id;
    private String name;

    @Creator
    public Manufacturer(String name) {
        this.name = name;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

}

package example

import io.micronaut.core.annotation.Creator

import jakarta.persistence.*

@Entity
class Manufacturer {
    @Id
    @GeneratedValue
    Long id
    final String name

    @Creator
    Manufacturer(String name) {
        this.name = name
    }
}

package example

import jakarta.persistence.*

@Entity
data class Manufacturer(
    @Id
    @GeneratedValue
    var id: Long?,
    val name: String
)

@JdbcRepository(dialect = Dialect.H2)
public interface ProductRepository extends CrudRepository<Product, Long> {
    @Join(value = "manufacturer", type = Join.Type.FETCH) // (1)
    List<Product> list();
}

@JdbcRepository(dialect = Dialect.H2)
public interface ProductRepository extends CrudRepository<Product, Long> {
    @Join(value = "manufacturer", type = Join.Type.FETCH) // (1)
    List<Product> list();
}

@JdbcRepository(dialect = Dialect.H2)
interface ProductRepository : CrudRepository<Product, Long> {
    @Join(value = "manufacturer", type = Join.Type.FETCH) // (1)
    fun list(): List<Product>
}

@Query("select * from book b where b.title like :title limit 5")
List<Book> findBooks(String title);

@Query("select * from book b where b.title like :title limit 5")
List<Book> findBooks(String title);

@Query("select * from book b where b.title like :title limit 5")
fun findBooks(title: String): List<Book>

@Procedure
Long calculateSum(@NonNull Long bookId);

@Procedure
Long calculateSum(@NonNull Long bookId);

@Procedure
fun calculateSum(bookId: @NonNull Long): Long

@MappedEntity
public class Book {
    @Id
    @GeneratedValue
    private ObjectId id;
    private String title;
    private int pages;

    public Book(String title, int pages) {
        this.title = title;
        this.pages = pages;
    }
    // ...
}

@MappedEntity
class Book {
    @Id
    @GeneratedValue
    private ObjectId id
    private String title
    private int pages

    Book(String title, int pages) {
        this.title = title
        this.pages = pages
    }
    //...
}

@MappedEntity
data class Book(@field:Id
                @GeneratedValue
                var id: ObjectId,
                var title: String,
                var pages: Int = 0)

package example;

import io.micronaut.data.annotation.Id;
import io.micronaut.data.model.Page;
import io.micronaut.data.model.Pageable;
import io.micronaut.data.model.Slice;
import io.micronaut.data.mongodb.annotation.MongoAggregateQuery;
import io.micronaut.data.mongodb.annotation.MongoDeleteQuery;
import io.micronaut.data.mongodb.annotation.MongoFindQuery;
import io.micronaut.data.mongodb.annotation.MongoRepository;
import io.micronaut.data.mongodb.annotation.MongoUpdateQuery;
import io.micronaut.data.repository.CrudRepository;
import org.bson.types.ObjectId;

import java.util.List;


@MongoRepository // (1)
interface BookRepository extends CrudRepository<Book, ObjectId> { // (2)
    Book find(String title);
}

package example

import io.micronaut.data.annotation.Id
import io.micronaut.data.model.Page
import io.micronaut.data.model.Pageable
import io.micronaut.data.model.Slice
import io.micronaut.data.mongodb.annotation.MongoAggregateQuery
import io.micronaut.data.mongodb.annotation.MongoDeleteQuery
import io.micronaut.data.mongodb.annotation.MongoFindQuery
import io.micronaut.data.mongodb.annotation.MongoRepository
import io.micronaut.data.mongodb.annotation.MongoUpdateQuery
import io.micronaut.data.repository.CrudRepository
import org.bson.types.ObjectId

@MongoRepository // (1)
interface BookRepository extends CrudRepository<Book, ObjectId> { // (2)
    Book find(String title);
}

package example

import io.micronaut.context.annotation.Executable
import io.micronaut.data.annotation.Id
import io.micronaut.data.model.Page
import io.micronaut.data.model.Pageable
import io.micronaut.data.model.Slice
import io.micronaut.data.mongodb.annotation.*
import io.micronaut.data.repository.CrudRepository
import org.bson.types.ObjectId

@MongoRepository // (1)
interface BookRepository : CrudRepository<Book, ObjectId> { // (2)
    @Executable
    fun find(title: String): Book
}

@Inject BookRepository bookRepository;

@Inject @Shared BookRepository bookRepository

@Inject
lateinit var bookRepository: BookRepository