update add db method ping

db/db.go

@@ -83,7 +83,7 @@ func connect() (dbx *sqlx.DB, err error) {
 			db.DB.SetMaxOpenConns(config.MaxOpenConns)
 			db.DB.SetMaxIdleConns(config.MaxIdle)
 			db.DB.SetConnMaxLifetime(config.MaxLifetime)
-			db.Ping()
+			err = db.Ping()
 		}
 	})
 	dbx = db
@@ -113,6 +113,16 @@ func (d *DB) Close() {
 	//d.conn.Close()
 }
 
+// Ping Ping connect
+func (d *DB) Ping() (err error) {
+	d.conn, err = connect()
+	if err != nil {
+		return
+	}
+
+	return d.conn.Ping()
+}
+
 // BeginTrans begin trans
 func (d *DB) BeginTrans() (err error) {
 	d.conn, err = connect()
@@ -335,6 +345,17 @@ func (d *DB) Limit(page, pagesize int) string {
 	return fmt.Sprintf(" limit %d offset %d", pagesize, (page-1)*pagesize)
 }
 
+// Ping ping connect
+func Ping() (err error) {
+	defaultDB.conn, err = connect()
+	if err != nil {
+		return
+	}
+
+	err = defaultDB.Ping()
+	return
+}
+
 // Select select
 func Select(dest interface{}, query string, args ...interface{}) (err error) {
 	defaultDB.conn, err = connect()