fix rollback bug

liuxiaolong

2019-08-15 ade573964a97a77d9652510ff8bcef8d3dfba9b8

fix rollback bug

 dbself.go

@@ -114,7 +114,8 @@
        }()
        for _,sql :=range sqls {
            result := tx.Exec(sql)
            if result.Error !=nil {
            err = result.Error
            if err !=nil {
                return false,result.Error
            }
            if result.RowsAffected == 0{