How to write Subqueries with In-Expressions in JPA 2.0, Criteria API?Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Explore Teams Collectivesâ„¢ on Stack Overflow Find centralized, trusted content and collaborate around the technologies you use most. Learn more about Collectives
Multiple databases with Spring Boot and Spring Data JPA
A little while back I knocked up a post describing how to enable a Spring application to connect to multiple data sources. At the time, I had only just heard about Spring Boot at the SpringOne 2GX conference in Santa Clara, so the examples didn’t take advantage of that and also didn’t work around some of the autowiring that it does. Recently, I was working on a little ETL project to migrate data f
JavaEE7ã‚’ã¯ã˜ã‚よã†(9) - JPA TIPS - エンタープライズギークス (Enterprise Geeks)
今回ã¯JPAã®ã¾ã¨ã‚ã¨ã—ã¦ã€JPAをより良ã使ã†æ–¹æ³•ã‚„知ã£ã¦ãŠãã¨ã‚ˆã„トピックã«ã¤ã„ã¦è¿°ã¹ã‚‹ã€‚ 1. テーブル定義ã¨ã‚¨ãƒ³ãƒ†ã‚£ãƒ†ã‚£ã‚¯ãƒ©ã‚¹å®šç¾©ã®æ•´åˆæ€§ã‚’ä¿ã¤ä»•çµ„㿠以å‰ã®è¨˜äº‹ã§ç´¹ä»‹ã—ãŸã‚ˆã†ã«ã€JPAã§ã¯ã‚¹ã‚ーマジェãƒãƒ¬ãƒ¼ã‚·ãƒ§ãƒ³ã‚’用ã„ã¦ã€ã‚¨ãƒ³ãƒ†ã‚£ãƒ†ã‚£ã‚¯ãƒ©ã‚¹ã‹ã‚‰DDLを生æˆã—ã¦å®Ÿè¡Œã—ãŸã‚Šã€ä»»æ„ã®DDLを実行ã—ãŸã‚Šã™ã‚‹ã“ã¨ãŒã§ãã‚‹ã€‚å¿…é ˆã¨ã„ã†ã‚ã‘ã§ã¯ãªã„ãŒã€ã“ã®ä»•çµ„ã¿ã¯ã€ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹è£½å“ã®é•ã„ã‚’å¸åŽã—ãŸã‚Šã€ãƒ¦ãƒ‹ãƒƒãƒˆãƒ†ã‚¹ãƒˆã§ãƒ†ãƒ¼ãƒ–ルã®ã‚»ãƒƒãƒˆã‚¢ãƒƒãƒ—ãŒç°¡å˜ã«è¡ŒãˆãŸã‚Šã§ãã¦ä¾¿åˆ©ã§ã‚る。 ã¨ã¯ã„ãˆã€ãƒ†ãƒ¼ãƒ–ル定義ãªã©ã¯åˆ¥ã®ãƒ„ールã§ç®¡ç†ã™ã‚‹ã“ã¨ã‚‚ã‚ã‚‹ã ã‚ã†ã€‚ ãã®å ´åˆã§ã‚‚ã€IDEã®æ©Ÿèƒ½ã«ã‚ˆã‚Šãƒ†ãƒ¼ãƒ–ルã‹ã‚‰ã‚¨ãƒ³ãƒ†ã‚£ãƒ†ã‚£ã‚’作æˆã—ãŸã‚Šã€ã‚¨ãƒ³ãƒ†ã‚£ãƒ†ã‚£ã‹ã‚‰ãƒ†ãƒ¼ãƒ–ルやDDLを作æˆã—ãŸã‚Šã™ã‚‹ã“ã¨ãŒå¯èƒ½ãªã®ã§ã€ã“れらã®æ©Ÿèƒ½ã‚’使用ã—ã€ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã¨ã‚¨ãƒ³ãƒ†ã‚£ãƒ†ã‚£ã®å®šç¾©ã‚’二é‡ç®¡ç†ã—ãªã„よã†ã«ã™ã‚‹ã¨ã‚ˆã„。 アノテーションã«ã‚ˆã‚‹ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹
JPA 2.1 ã®æ–°æ©Ÿèƒ½ Entity Graphs ã¾ã¨ã‚ - A Memorandum
Entity Graphs ã¨ã¯ Entity Graph ã®æ§‹æˆ Graph アノテーション㨠Graph API ç°¡å˜ãªåˆ©ç”¨ä¾‹ Fetch Graph 㨠Load Graph Attribute Node ã®å®šç¾© Subgraph ã®å®šç¾© Subgraph ã®è¤‡æ•°å‚ç…§ ç¶™æ‰¿æ§‹é€ ã® Graph 定義 ãƒ«ãƒ¼ãƒˆç¶™æ‰¿æ§‹é€ ã® Graph Map Key Subgraphs タイプセーフãªå±žæ€§å®šç¾© Entity Graph ã®å–å¾— åå‰ä»˜ãã® Entity Graph ã¸ã®è¿½åŠ Entity Graph ã®åˆ©ç”¨ Entity Graphs ã¨ã¯ JPA 2.1 ã§ã¯ Entity Graph を使ã†ã“ã¨ã§ fetch 計画を指定ã§ãるよã†ã«ãªã‚Šã¾ã—ãŸã€‚ã“ã‚Œã«ã‚ˆã‚Š query ã‚„ find ã§å–å¾—ã™ã‚‹å¯¾è±¡ã‚’をカスタマイズã§ãるよã†ã«ãªã‚Šã¾ã™ã€‚åŒã˜ Entity ã‹ã‚‰æ§˜ã€…ãªãƒ‡ãƒ¼ã‚¿ã®è¦‹ã›æ–¹ãŒå¿…è¦ã§ã€æ™‚
メモリを逼迫ã•ã›ãšã«JPAã§å¤§é‡ãƒ‡ãƒ¼ã‚¿ã‚’å–å¾—ã™ã‚‹æ–¹æ³• - エンタープライズギークス (Enterprise Geeks)
JPA（Java Persistence API）ã¯ã€ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã‹ã‚‰å–å¾—ã—ãŸãƒ‡ãƒ¼ã‚¿ã‚’メモリ上ã«ä¿æŒã™ã‚‹ä»•æ§˜ã«ãªã£ã¦ã„る。 ãã®ãŸã‚ã€ä¸ç”¨æ„ã«å¤§é‡ã®ãƒ‡ãƒ¼ã‚¿ã‚’å–å¾—ã™ã‚‹ã¨ã€ãƒ¡ãƒ¢ãƒªå®¹é‡ã‚’圧迫ã—ã¦ã—ã¾ã„ã€æœ€æ‚ªã®å ´åˆã¯OutOfMemoryErrorãŒèµ·ãã‚‹å¯èƒ½æ€§ãŒã‚る。 本稿ã§ã¯ã€JPAã®æ¨™æº–機能ãŠã‚ˆã³ãƒã‚¤ãƒ†ã‚£ãƒ–機能ã®ãã‚Œãžã‚Œã«ã¤ã„ã¦ã€ãƒ¡ãƒ¢ãƒªä½¿ç”¨é‡ã‚’抑ãˆãªãŒã‚‰å¤§é‡ãƒ‡ãƒ¼ã‚¿ã‚’å–å¾—ã™ã‚‹æ–¹æ³•ã¨ã€ãƒã‚¤ãƒ†ã‚£ãƒ–機能ãŒã†ã¾ã動作ã—ãªã„å ´åˆã®å›žé¿ç–を紹介ã™ã‚‹ã€‚ JPAã¯èªã¿è¾¼ã‚“ã データを一次ã‚ャッシュã¨ã—ã¦ä¿æŒã™ã‚‹ JPAã¯ã€èªã¿è¾¼ã‚“ã Entityã‚’PersistenceContext（永続化コンテã‚スト）ã¨å‘¼ã¶é ˜åŸŸã§ç®¡ç†ã™ã‚‹ã€‚ ã“ã“ã«æ ¼ç´ã•ã‚ŒãŸçŠ¶æ…‹ã‚’一次ã‚ャッシュã¨å‘¼ã³ã€ä¸€æ¬¡ã‚ャッシュã•ã‚ŒãŸEntityã‚’ManagedãªçŠ¶æ…‹ï¼ˆJPAã«ç®¡ç†ã•ã‚ŒãŸçŠ¶æ…‹ï¼‰ã¨å‘¼ã¶ï¼ˆãªãŠã€äºŒæ¬¡ã‚ャッシュもã‚ã‚‹ãŒå‰²æ„›ã™ã‚‹ï¼‰ã€‚ Persist
[Java][JPA] JPA ã§å¤§ããªãƒ†ãƒ¼ãƒ–ルを走査ã™ã‚‹ - Secret Staircase on ã¯ã¦ãª
JPA ã§è¡Œæ•°ã®å¤šã„テーブルを select ã—㦠getResultList() ã™ã‚‹ã¨å…¨éƒ¨ãƒ¡ãƒ¢ãƒªã«å±•é–‹ã™ã‚‹ã®ã§åŠ¹çŽ‡ãŒè‰¯ããªã„ã§ã™ã€‚ã“ã†ã„ã†ã¨ãã€JDBC ãªã‚‰ ResultSet をオープンã—ãŸã¾ã¾ãƒ«ãƒ¼ãƒ—ã—ã¾ã™ã—ã€S2JDBC ãªã‚‰ iterate() 使ã„ã¾ã™ã。ã¨ã“ã‚㌠JPA ã«ã¯é©åˆ‡ãªæ–¹æ³•ãŒãªã„よã†ã§ã™ã€‚ ã“ã¡ã‚‰ã«ã‚ˆã‚Œã°ã€ http://stackoverflow.com/questions/5067619/jpa-what-is-the-proper-pattern-for-iterating-over-large-result-sets プãƒãƒ€ã‚¯ãƒˆç‹¬è‡ªã®æ–¹æ³•ã‚’使ãˆã°ã„ã„よã†ã§ã™ãŒã€pure JPA ãªãƒ™ã‚¹ãƒˆã‚¢ãƒ³ã‚µãƒ¼ã®æ–¹æ³•ã‚’ Iterator ã§ãƒ©ãƒƒãƒ—ã—ã¦ä½¿ã„ã‚„ã™ãã—ã¦ã¿ã¾ã—ãŸã€‚ https://github.com/akr4/jpa-lazy-fetch-iterator
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Hibernate JPA 2 Metamodel Generator
JPA 2 defines a new typesafe Criteria API which allows criteria queries to be constructed in a strongly-typed manner, using metamodel objects to provide type safety. For developers it is important that the task of the metamodel generation can be automated. Hibernate Static Metamodel Generator is an annotation processor based on the [Pluggable Annotation Processing API] with the task of creating JP
JPAã‹ã‚‰JDBCã®ãƒãƒƒãƒæ›´æ–°ã‚’使ㆠ- kagamihogeã®æ—¥è¨˜
JDBCã®addBatchã¨executeBatchã®é »åº¦å¤‰æ›´æ™‚ã®å‹•ãã‚’statspackã§è¦‹ã¦ã¿ã‚‹ - kagamihogeã®æ—¥è¨˜ã¯ã€JDBCを直接使用ã—ã¦ã„ãŸã€‚ãŒã€JPAã‹ã‚‰åŒã˜ã“ã¨ã‚’ã™ã‚‹ã«ã¯ã©ã†ã„ã†è¨å®šãªã©ã‚’ã™ã‚Œã°ã‚ˆã„ã®ã‹ã€‚ãれをやã£ã¦ã¿ã¦ã€ã¤ã„ã§ã«å®Ÿè¡Œé€Ÿåº¦ã®é•ã„も計測ã™ã‚‹ã€‚ 実際ã«ã¯ã€æ£ç¢ºã«ã¯JPAã§ã¯ãªãJPAã®ãƒ—ãƒãƒã‚¤ãƒ€ãƒ¼ã§ã‚ã‚‹EclipsLink,Hibernateãã‚Œãžã‚Œã«å›ºæœ‰ã®è¨å®šã‚’ã™ã‚‹ã€‚ã¨ã¯ã„ãˆã€çµå±€ã¯ãれらã®è¨å®šã‚‚JDBCã®ãƒãƒƒãƒæ›´æ–°ã‚’ラッピングã—ã¦ã„ã‚‹ã ã‘ã€ã¨æ€ã‚れる。 環境 DB CentOS-6.4-x86_64 Oracle Database Express Edition 11g Release 2 Java Java SE Development Kit 7u45 Eclipse Kepler(4.3.1) SR1 IDE for Java EE Deve
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JPQLを利用ã™ã‚‹éš›ã«è¡Œã£ã¦ã„ã‚‹ã“㨠- Challenge Engineer Life !
今回ã®é–‹ç™ºã§ã¯åˆã‚ã¦Java EE6を触りã€åˆã‚ã¦ORマッパーを触るã®ã§ã€DBã¾ã‚りや性能ã¯çµæ§‹æ°—ã«ãªã‚‹æ‰€ã§ã™(^^; ã¡ã‚‡ãã¡ã‚‡ã「ORマッパー使ã†ãªã‚“ã¦å±ãªã„ãã‡ã€ãªã‚“ã¦å‘¨å›²ã«ã‚‚言ã‚ã‚ŒãŸã‚Šã‚‚ã—ã¾ã™ãŒã€JPAã‚„EclipseLinkã‚’ã‚ーワードã«æµ·å¤–ã§ã®æƒ…å ±ã‚‚å¤šãã€Java EE6ã¨ã—ã¦ã‚‚JPAを利用ã™ã‚‹ã“ã¨ãŒæ¨™æº–(ã§ã™ã‚ˆã!?)ã ã¨æ€ã£ã¦ã„ã‚‹ã®ã§ã€ã¨ã‚Šã‚ãˆãšã¯é–‹ç™ºæ®µéšŽã§è‰²ã€…ã¨æ°—を付ã‘ãªãŒã‚‰ä½¿ã£ã¦ã¿ã¦ã„ã¾ã™ã€‚ JPQLã¯ãƒ¡ã‚¤ãƒ³ã§å‹•çš„クエリを採用(Criteriaを利用ã—ãŸã‹ã£ãŸã®ã§ã™ãŒâ€¦æ–念)ã—ã€éžå¸¸ã«ç°¡å˜ãªã‚‚ã®ã¯Named Queryを利用ã—ã¦ã¾ã™ã€‚ ã§ã€ã‚¿ã‚¤ãƒˆãƒ«ã«ã‚る「JPQLを利用ã™ã‚‹éš›ã«è¡Œã£ã¦ã„ã‚‹ã“ã¨ã€ã§ã™ãŒã€ã‚ã¾ã‚Šå¤§ãã‚ŒãŸã“ã¨ã§ã¯ã‚ã‚Šã¾ã›ã‚“。ãŸã ã€NetBeans7.3ã«ãªã£ã¦ã‹ã‚‰çµ„ã¿è¾¼ã¾ã‚ŒãŸãƒ„ールã®ãŠã‹ã’ã§ã€ä½œæ¥ãŒåŠ‡çš„ã«è»½æ¸›ã•ã‚ŒãŸã®ã§ã€æ‰‹é †ã‚’ã¾ã¨ã‚ã¦ãŠã“ã†ã‹ãªã¨ã€‚ Java
Querying in SQL with Querydsl
Querydsl provides a typesafe querying layer on top of JPA, JDO, JDBC and other backends. This blog post presents a simple tutorial on how to get started with querying in SQL using Querydsl. Querydsl for SQL provides a typesafe view of the relational schema and makes expressing database queries in Java as intuitive as possible. Getting started To get started with Querydsl for SQL using a Maven 2 ba
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先日〠[twitter:@seratch]ã•ã‚“ã‹ã‚‰æ•™ãˆã¦ã„ãŸã ã„ãŸQuerydslãŒã™ã”ã„良ã‹ã£ãŸã®ã§è¨˜äº‹ã¨ã—ã¦æ›¸ãã¾ã™ã€‚ http://www.querydsl.com/ JPAã«ãŠã‘る課題 JPAã§ã¯JPQLã¨Criteriaã¨ã„ã†äºŒã¤ã®ã‚¯ã‚¨ãƒªè¨˜è¿°è¨€èªžãŒã‚ã‚Šã¾ã™ã€‚ ã—ã‹ã—ãªãŒã‚‰ã€ãã‚Œãžã‚Œä½¿ã„å‹æ‰‹ã¨ã„ã†æ„味ã§ã¯é›£ã®ã‚ã‚‹ã‚‚ã®ã§ã—ãŸã€‚ JPQL JPQLã¯ä»¥ä¸‹ã®ã‚ˆã†ãªã€SQLライクãªã‚¯ã‚¨ãƒªè¨˜è¿°è¨€èªžã§ã™ã€‚ select new com.github.megascus.EmployeeBean(e.code, e.name, e.age) from Employee as e where name like 's%'SQLライクã«è¨˜è¿°ã™ã‚‹ã“ã¨ãŒã§ãã‚‹ãŸã‚ã€SQLãŒç†è§£ã§ãる人ã«ã¨ã£ã¦ã¯ç†è§£ã—ã‚„ã™ã„ã¨ã„ã†åˆ©ç‚¹ãŒã‚ã‚Šã¾ã™ã€‚ ã—ã‹ã—ãªãŒã‚‰ã€JPQL自体ã¯ãŸã ã®æ–‡å—列ã§å®šç¾©ã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ ãã®ãŸ
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Using the JPA Criteria API, can you do a fetch join that results in only one join?
Criteria Update/Delete - The easy way to implement bulk operations in JPA 2.1
GitHub - chelu/jdal: Java Database Application Library
Criteria API: Fetch of a list returns repeated main entity
2. JPQL Language Reference
https://blog.ik.am/entries/150
Querydsl - Unified Queries for Java
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