Gorm v2 connect to database

db.go

// Connect to database
func InitDataDB(dsn string, autoMigrate bool) (db *gorm.DB, err error) {
	db, err = gorm.Open("mysql", dsn)
	if err != nil {
		log.Fatalf("error while open connection to database: %v\n", err)
	}

	//SetMaxIdleConns sets the maximum number of connections in the idle connection pool.
	//If MaxOpenConns is greater than 0 but less than the new MaxIdleConns, then the new MaxIdleConns will be
	//reduced to match the MaxOpenConns limit.
	//If n <= 0, no idle connections are retained.
	//The default max idle connections is currently 2. This may change in a future release.
	db.DB().SetMaxIdleConns(0)

	//SetMaxOpenConns sets the maximum number of open connections to the database.
	//If MaxIdleConns is greater than 0 and the new MaxOpenConns is less than MaxIdleConns, then MaxIdleConns will
	//be reduced to match the new MaxOpenConns limit.
	//If n <= 0, then there is no limit on the number of open connections. The default is 0 (unlimited).
	db.DB().SetMaxOpenConns(2000)

	// SetConnMaxLifetime sets the maximum amount of time a connection may be reused.
	db.DB().SetConnMaxLifetime(time.Minute*30)

	//SetConnMaxIdleTime sets the maximum amount of time a connection may be idle.
	//	Expired connections may be closed lazily before reuse.
	//	If d <= 0, connections are not closed due to a connection's idle time.
	db.DB().SetConnMaxIdleTime(time.Hour)

	db.LogMode(false)

	return
}