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table2struct.go
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table2struct.go
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package converter
import (
"database/sql"
"errors"
"fmt"
"log"
"os"
"os/exec"
"strings"
_ "github.com/go-sql-driver/mysql"
)
//map for converting mysql type to golang types
var typeForMysqlToGo = map[string]string{
"int": "int64",
"integer": "int64",
"tinyint": "int64",
"smallint": "int64",
"mediumint": "int64",
"bigint": "int64",
"int unsigned": "int64",
"integer unsigned": "int64",
"tinyint unsigned": "int64",
"smallint unsigned": "int64",
"mediumint unsigned": "int64",
"bigint unsigned": "int64",
"bit": "int64",
"bool": "bool",
"enum": "string",
"set": "string",
"varchar": "string",
"char": "string",
"tinytext": "string",
"mediumtext": "string",
"text": "string",
"longtext": "string",
"blob": "string",
"tinyblob": "string",
"mediumblob": "string",
"longblob": "string",
"date": "time.Time", // time.Time or string
"datetime": "time.Time", // time.Time or string
"timestamp": "time.Time", // time.Time or string
"time": "time.Time", // time.Time or string
"float": "float64",
"double": "float64",
"decimal": "float64",
"binary": "string",
"varbinary": "string",
"json": "json.RawMessage",
}
type Table2Struct struct {
dsn string
savePath string
db *sql.DB
table string
prefix string
config *T2tConfig
err error
realNameMethod string
enableJsonTag bool // 是否添加json的tag, 默认不添加
packageName string // 生成struct的包名(默认为空的话, 则取名为: package model)
tagKey string // tag字段的key值,默认是orm
dateToTime bool // 是否将 date相关字段转换为 time.Time,默认否
}
type T2tConfig struct {
StructNameToHump bool // 结构体名称是否转为驼峰式，默认为false
RmTagIfUcFirsted bool // 如果字段首字母本来就是大写, 就不添加tag, 默认false添加, true不添加
TagToLower bool // tag的字段名字是否转换为小写, 如果本身有大写字母的话, 默认false不转
JsonTagToHump bool // json tag是否转为驼峰，默认为false，不转换
UcFirstOnly bool // 字段首字母大写的同时, 是否要把其他字母转换为小写,默认false不转换
SeperatFile bool // 每个struct放入单独的文件,默认false,放入同一个文件
}
func NewTable2Struct() *Table2Struct {
return &Table2Struct{}
}
func (t *Table2Struct) Dsn(d string) *Table2Struct {
t.dsn = d
return t
}
func (t *Table2Struct) TagKey(r string) *Table2Struct {
t.tagKey = r
return t
}
func (t *Table2Struct) PackageName(r string) *Table2Struct {
t.packageName = r
return t
}
func (t *Table2Struct) RealNameMethod(r string) *Table2Struct {
t.realNameMethod = r
return t
}
func (t *Table2Struct) SavePath(p string) *Table2Struct {
t.savePath = p
return t
}
func (t *Table2Struct) DB(d *sql.DB) *Table2Struct {
t.db = d
return t
}
func (t *Table2Struct) Table(tab string) *Table2Struct {
t.table = tab
return t
}
func (t *Table2Struct) Prefix(p string) *Table2Struct {
t.prefix = p
return t
}
func (t *Table2Struct) EnableJsonTag(p bool) *Table2Struct {
t.enableJsonTag = p
return t
}
func (t *Table2Struct) DateToTime(d bool) *Table2Struct {
t.dateToTime = d
return t
}
func (t *Table2Struct) Config(c *T2tConfig) *Table2Struct {
t.config = c
return t
}
func (t *Table2Struct) Run() error {
if t.config == nil {
t.config = new(T2tConfig)
}
// 链接mysql, 获取db对象
t.dialMysql()
if t.err != nil {
return t.err
}
// 获取表和字段的shcema
tableColumns, err := t.getColumns()
if err != nil {
return err
}
// 包名
var packageName string
if t.packageName == "" {
packageName = "package model\n\n"
} else {
packageName = fmt.Sprintf("package %s\n\n", t.packageName)
}
// 组装struct
var structContent string
for tableRealName, item := range tableColumns {
// 去除前缀
if t.prefix != "" {
tableRealName = tableRealName[len(t.prefix):]
}
tableName := tableRealName
structName := tableName
if t.config.StructNameToHump {
structName = t.camelCase(structName)
}
/*
switch len(tableName) {
case 0:
case 1:
tableName = strings.ToUpper(tableName[0:1])
default:
// 字符长度大于1时
tableName = strings.ToUpper(tableName[0:1]) + tableName[1:]
}
*/
tableName = t.camelCase(tableName)
depth := 1
structContent += "type " + structName + " struct {\n"
for _, v := range item {
//structContent += tab(depth) + v.ColumnName + " " + v.Type + " " + v.Json + "\n"
// 字段注释
var clumnComment string
if v.ColumnComment != "" {
clumnComment = fmt.Sprintf(" // %s", v.ColumnComment)
}
structContent += fmt.Sprintf("%s%s %s %s%s\n",
tab(depth), v.ColumnName, v.Type, v.Tag, clumnComment)
}
structContent += tab(depth-1) + "}\n\n"
// 添加 method 获取真实表名
if t.realNameMethod != "" {
structContent += fmt.Sprintf("func (%s) %s() string {\n",
structName, t.realNameMethod)
structContent += fmt.Sprintf("%sreturn \"%s\"\n",
tab(depth), tableRealName)
structContent += "}\n\n"
}
}
// 如果有引入 time.Time, 则需要引入 time 包
var importContent string
if strings.Contains(structContent, "time.Time") {
importContent = "import \"time\"\n\n"
}
// 添加json类型支持
if strings.Contains(structContent, "json.RawMessage") {
importContent += "import \"encoding/json\"\n\n"
}
// 写入文件struct
var savePath = t.savePath
// 是否指定保存路径
if savePath == "" {
savePath = "model.go"
}
filePath := fmt.Sprintf("%s", savePath)
f, err := os.Create(filePath)
if err != nil {
log.Println("Can not write file")
return err
}
defer f.Close()
f.WriteString(packageName + importContent + structContent)
cmd := exec.Command("gofmt", "-w", filePath)
cmd.Run()
log.Println("gen model finish!!!")
return nil
}
func (t *Table2Struct) dialMysql() {
if t.db == nil {
if t.dsn == "" {
t.err = errors.New("dsn数据库配置缺失")
return
}
t.db, t.err = sql.Open("mysql", t.dsn)
}
return
}
type column struct {
ColumnName string
Type string
Nullable string
TableName string
ColumnComment string
Tag string
}
// Function for fetching schema definition of passed table
func (t *Table2Struct) getColumns(table ...string) (tableColumns map[string][]column, err error) {
// 根据设置,判断是否要把 date 相关字段替换为 string
if t.dateToTime == false {
typeForMysqlToGo["date"] = "string"
typeForMysqlToGo["datetime"] = "string"
typeForMysqlToGo["timestamp"] = "string"
typeForMysqlToGo["time"] = "string"
}
tableColumns = make(map[string][]column)
// sql
var sqlStr = `SELECT COLUMN_NAME,DATA_TYPE,IS_NULLABLE,TABLE_NAME,COLUMN_COMMENT
FROM information_schema.COLUMNS
WHERE table_schema = DATABASE()`
// 是否指定了具体的table
if t.table != "" {
sqlStr += fmt.Sprintf(" AND TABLE_NAME = '%s'", t.prefix+t.table)
}
// sql排序
sqlStr += " order by TABLE_NAME asc, ORDINAL_POSITION asc"
rows, err := t.db.Query(sqlStr)
if err != nil {
log.Println("Error reading table information: ", err.Error())
return
}
defer rows.Close()
for rows.Next() {
col := column{}
err = rows.Scan(&col.ColumnName, &col.Type, &col.Nullable, &col.TableName, &col.ColumnComment)
if err != nil {
log.Println(err.Error())
return
}
//col.Json = strings.ToLower(col.ColumnName)
col.Tag = col.ColumnName
col.ColumnComment = col.ColumnComment
col.ColumnName = t.camelCase(col.ColumnName)
col.Type = typeForMysqlToGo[col.Type]
jsonTag := col.Tag
// 字段首字母本身大写, 是否需要删除tag
if t.config.RmTagIfUcFirsted &&
col.ColumnName[0:1] == strings.ToUpper(col.ColumnName[0:1]) {
col.Tag = "-"
} else {
// 是否需要将tag转换成小写
if t.config.TagToLower {
col.Tag = strings.ToLower(col.Tag)
jsonTag = col.Tag
}
if t.config.JsonTagToHump {
jsonTag = t.camelCase(jsonTag)
}
//if col.Nullable == "YES" {
// col.Json = fmt.Sprintf("`json:\"%s,omitempty\"`", col.Json)
//} else {
//}
}
if t.tagKey == "" {
t.tagKey = "orm"
}
if t.enableJsonTag {
//col.Json = fmt.Sprintf("`json:\"%s\" %s:\"%s\"`", col.Json, t.config.TagKey, col.Json)
col.Tag = fmt.Sprintf("`%s:\"%s\" json:\"%s\"`", t.tagKey, col.Tag, jsonTag)
} else {
col.Tag = fmt.Sprintf("`%s:\"%s\"`", t.tagKey, col.Tag)
}
//columns = append(columns, col)
if _, ok := tableColumns[col.TableName]; !ok {
tableColumns[col.TableName] = []column{}
}
tableColumns[col.TableName] = append(tableColumns[col.TableName], col)
}
return
}
func (t *Table2Struct) camelCase(str string) string {
// 是否有表前缀, 设置了就先去除表前缀
if t.prefix != "" {
str = strings.Replace(str, t.prefix, "", 1)
}
var text string
//for _, p := range strings.Split(name, "_") {
for _, p := range strings.Split(str, "_") {
// 字段首字母大写的同时, 是否要把其他字母转换为小写
switch len(p) {
case 0:
case 1:
text += strings.ToUpper(p[0:1])
default:
// 字符长度大于1时
if t.config.UcFirstOnly == true {
text += strings.ToUpper(p[0:1]) + strings.ToLower(p[1:])
} else {
text += strings.ToUpper(p[0:1]) + p[1:]
}
}
}
return text
}
func tab(depth int) string {
return strings.Repeat("\t", depth)
}