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Go语学习笔记 - gorm使用 - gorm处理错误 | Web框架Gin(十)
2022-07-07 00:38:00 【剑客阿良_ALiang】
学习笔记,写到哪是哪。
接着上一篇文章:Go语学习笔记 - gorm使用 - 原生sql、命名参数、Rows、ToSQL | Web框架Gin(九)_剑客阿良_ALiang的博客-CSDN博客
目前gorm对数据库的一些操作基本了解。
本篇主要测试一下gorm的异常处理方式。
项目地址:github地址
可以先看看gorm定义的异常,代码如下:
var (
// ErrRecordNotFound record not found error
ErrRecordNotFound = logger.ErrRecordNotFound
// ErrInvalidTransaction invalid transaction when you are trying to `Commit` or `Rollback`
ErrInvalidTransaction = errors.New("invalid transaction")
// ErrNotImplemented not implemented
ErrNotImplemented = errors.New("not implemented")
// ErrMissingWhereClause missing where clause
ErrMissingWhereClause = errors.New("WHERE conditions required")
// ErrUnsupportedRelation unsupported relations
ErrUnsupportedRelation = errors.New("unsupported relations")
// ErrPrimaryKeyRequired primary keys required
ErrPrimaryKeyRequired = errors.New("primary key required")
// ErrModelValueRequired model value required
ErrModelValueRequired = errors.New("model value required")
// ErrInvalidData unsupported data
ErrInvalidData = errors.New("unsupported data")
// ErrUnsupportedDriver unsupported driver
ErrUnsupportedDriver = errors.New("unsupported driver")
// ErrRegistered registered
ErrRegistered = errors.New("registered")
// ErrInvalidField invalid field
ErrInvalidField = errors.New("invalid field")
// ErrEmptySlice empty slice found
ErrEmptySlice = errors.New("empty slice found")
// ErrDryRunModeUnsupported dry run mode unsupported
ErrDryRunModeUnsupported = errors.New("dry run mode unsupported")
// ErrInvalidDB invalid db
ErrInvalidDB = errors.New("invalid db")
// ErrInvalidValue invalid value
ErrInvalidValue = errors.New("invalid value, should be pointer to struct or slice")
// ErrInvalidValueOfLength invalid values do not match length
ErrInvalidValueOfLength = errors.New("invalid association values, length doesn't match")
// ErrPreloadNotAllowed preload is not allowed when count is used
ErrPreloadNotAllowed = errors.New("preload is not allowed when count is used")
)
编写一个接口来测试一下异常。
在student_service下新增TestError方法。
方法代码如下:
//测试gorm异常
func (t StudentImpl) TestError() rsp.ResponseMsg {
log.Logger.Info("测试gorm异常")
_db := mysql.GetDB()
var _student db_entity.Student
if _err := _db.Where("del_flag = 1").First(&_student).Error; _err != nil {
if errors.Is(_err, gorm.ErrRecordNotFound) {
fmt.Println("error is ErrRecordNotFound")
}
log.Logger.Panic("error -> ", log.Any("error", _err))
}
log.Logger.Debug("student -> ", log.Any("student", _student))
return *rsp.SuccessMsg("测试成功")
}
如果sql无法获取到record,会报出ErrRecordNotFound异常。
controller层增加接口代码,如下:
//测试gorm异常
func (s StudentController) TestError(context *gin.Context) {
log.Logger.Info("测试gorm异常接口")
_rsp := services.StudentServ.TestError()
context.JSON(http.StatusOK, _rsp)
}
验证一下接口执行后的打印输出。
可以看到是全局捕获的异常响应报文。
小结
在项目开发中,异常处理是比较必要的。
最近有点忙,也有所体悟,有时候需要把压力释放一下,但是需要合理有效的方式。有时候需要把压力往身边分担下,并不是什么时候都需要扛下所有。
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