Merge pull request '创建数据库engine后，进行连接测试，测试不通过返回错误' (#56) from feature_db into develop

Reviewed-on: http://101.201.121.115:3000/leo/LAPP_GAAS_GFrame_BACKEND/pulls/56
Reviewed-by: weichenglei <chenglei.wei@le-it.com.cn>

db/db.go

@@ -46,6 +46,9 @@ func InitDb() error {
 					fmt.Printf("err1 is %v", err)
 					return err
 				}
+				if err = master.Ping(); err != nil {
+					return err
+				}
 			case "mysql":
 				driveSource := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8",
 					v.User, v.Pwd, v.Host, v.Port, v.DbName)
@@ -54,6 +57,10 @@ func InitDb() error {
 					fmt.Printf("err2 is %v", err)
 					return err
 				}
+				if err = master.Ping(); err != nil {
+					return err
+				}
+
 			}
 		} else {
 			switch v.DriverName {
@@ -66,6 +73,9 @@ func InitDb() error {
 					fmt.Printf("err1 is %v", err)
 					return err
 				}
+				if err = slave.Ping(); err != nil {
+					return err
+				}
 				slaves = append(slaves, slave)
 			case "mysql":
 				driveSource := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8",
@@ -75,6 +85,9 @@ func InitDb() error {
 					fmt.Printf("err2 is %v", err)
 					return err
 				}
+				if err = slave.Ping(); err != nil {
+					return err
+				}
 				slaves = append(slaves, slave)
 			}
 		}