package entity import ( "fmt" "sync" "time" "github.com/jinzhu/gorm" _ "github.com/jinzhu/gorm/dialects/mysql" _ "github.com/jinzhu/gorm/dialects/sqlite" ) // Database drivers (sql dialects). const ( MySQL = "mysql" SQLite = "sqlite3" ) var dbProvider DbProvider type DbProvider interface { Db() *gorm.DB } // IsDialect returns true if the given sql dialect is used. func IsDialect(name string) bool { return name == Db().Dialect().GetName() } // DbDialect returns the sql dialect name. func DbDialect() string { return Db().Dialect().GetName() } // SetDbProvider sets the provider to get a gorm db connection. func SetDbProvider(provider DbProvider) { dbProvider = provider } // HasDbProvider returns true if a db provider exists. func HasDbProvider() bool { return dbProvider != nil } // Db returns a database connection. func Db() *gorm.DB { return dbProvider.Db() } // UnscopedDb returns an unscoped database connection. func UnscopedDb() *gorm.DB { return Db().Unscoped() } type Gorm struct { Driver string Dsn string once sync.Once db *gorm.DB } // Db returns the gorm db connection. func (g *Gorm) Db() *gorm.DB { g.once.Do(g.Connect) if g.db == nil { log.Fatal("entity: database not connected") } return g.db } // Connect creates a new gorm db connection. func (g *Gorm) Connect() { db, err := gorm.Open(g.Driver, g.Dsn) if err != nil || db == nil { for i := 1; i <= 12; i++ { fmt.Printf("gorm.Open(%s, %s) %d\n", g.Driver, g.Dsn, i) db, err = gorm.Open(g.Driver, g.Dsn) if db != nil && err == nil { break } else { time.Sleep(5 * time.Second) } } if err != nil || db == nil { fmt.Println(err) log.Fatal(err) } } db.LogMode(false) db.SetLogger(log) db.DB().SetMaxIdleConns(4) db.DB().SetMaxOpenConns(256) g.db = db } // Close closes the gorm db connection. func (g *Gorm) Close() { if g.db != nil { if err := g.db.Close(); err != nil { log.Fatal(err) } g.db = nil } }