通过原生SQL判断数据是否存在

func (s *service) existMongodb(DBInstanceId string) (bool, error) {
var DbInstanceDescription string
err := s.db.QueryRow("SELECT db_instance_description FROM mongodb WHERE db_instance_id=?", DBInstanceId).Scan(&DbInstanceDescription)
if err != nil {
if err == sql.ErrNoRows {
fmt.Println("no data")
return false, nil
} else {
fmt.Printf("错误: %s", err)
return false, err
}
}
return true, nil
}