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get.go
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get.go
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package gormdb
import (
"fmt"
"github.com/MinamiKotoriCute/serr"
"gorm.io/driver/mysql"
"gorm.io/gorm"
)
func (o *GormDb[T]) connect(dbType T) error {
dsn := ""
if t, ok := any(dbType).(DbTypeGetDsn); ok {
dsn = t.GetDsn(o.config)
} else {
return serr.New("dsn is empty")
}
db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
if err != nil {
return serr.Wrapf(err, "dsn:%s", dsn)
}
o.db[dbType] = db
return nil
}
func (o *GormDb[T]) createDatabaseIfNotExist(databaseName string) error {
var defaultDbType T
defaultDb := o.db[defaultDbType]
sql := fmt.Sprintf("CREATE DATABASE IF NOT EXISTS %s", databaseName)
result := defaultDb.Exec(sql)
if result.Error != nil {
serr.Wrapf(result.Error, "sql: %s", sql)
}
return nil
}
func (o *GormDb[T]) Connect() error {
var defaultDbType T
return o.connect(defaultDbType)
}
// return a gorm.DB or panic
//
// if o.config.AutoMigrate is true:
//
// will create database if not exist. database name = T.GetDatabase()
// will auto migrate tables if T.GetTables() is not empty
func (o *GormDb[T]) GetDb(dbType T) *gorm.DB {
if db, ok := o.db[dbType]; ok {
return db
}
o.mutex.Lock()
defer o.mutex.Unlock()
if db, ok := o.db[dbType]; ok {
return db
}
// init db
if o.config.AutoMigrate {
databaseName := ""
if t, ok := any(dbType).(DbTypeGetDatabase); ok {
databaseName = t.GetDatabase()
} else {
panic("databaseName is empty")
}
if err := o.createDatabaseIfNotExist(databaseName); err != nil {
panic(err)
}
}
if err := o.connect(dbType); err != nil {
panic(err)
}
db := o.db[dbType]
if o.config.AutoMigrate {
if t, ok := any(dbType).(DbTypeGetTables); ok {
if tables := t.GetTables(); len(tables) != 0 {
if err := db.AutoMigrate(tables...); err != nil {
panic(err)
}
}
}
}
return db
}
// return a gorm.DB or panic
func (o *GormDb[T]) Get() *gorm.DB {
var defaultDbType T
return o.GetDb(defaultDbType)
}