GORM 中文版

## [](https://gorm.io/docs/hooks.html#Object-Life-Cycle "Object Life Cycle")Object Life Cycle

Hooks are functions that are called before or after creation/querying/updating/deletion.

If you have defined specified methods for a model, it will be called automatically when creating, updating, querying, deleting, and if any callback returns an error, GORM will stop future operations and rollback current transaction.

The type of hook methods should be `func(*gorm.DB) error`

## [](https://gorm.io/docs/hooks.html#Hooks "Hooks")Hooks

### [](https://gorm.io/docs/hooks.html#Creating-an-object "Creating an object")Creating an object

Available hooks for creating

```

BeforeSave
BeforeCreate



AfterCreate
AfterSave

```

Code Example:

```
func (u *User) BeforeCreate(tx *gorm.DB) (err error) {
  u.UUID = uuid.New()

  if !u.IsValid() {
    err = errors.New("can't save invalid data")
  }
  return
}

func (u *User) AfterCreate(tx *gorm.DB) (err error) {
  if u.ID == 1 {
    tx.Model(u).Update("role", "admin")
  }
  return
}
```

> **NOTE** Save/Delete operations in GORM are running in transactions by default, so changes made in that transaction are not visible until it is committed, if you return any error in your hooks, the change will be rollbacked

```
func (u *User) AfterCreate(tx *gorm.DB) (err error) {
  if !u.IsValid() {
    return errors.New("rollback invalid user")
  }
  return nil
}
```

### [](https://gorm.io/docs/hooks.html#Updating-an-object "Updating an object")Updating an object

Available hooks for updating

```

BeforeSave
BeforeUpdate



AfterUpdate
AfterSave

```

Code Example:

```
func (u *User) BeforeUpdate(tx *gorm.DB) (err error) {
  if u.readonly() {
    err = errors.New("read only user")
  }
  return
}


func (u *User) AfterUpdate(tx *gorm.DB) (err error) {
  if u.Confirmed {
    tx.Model(&Address{}).Where("user_id = ?", u.ID).Update("verfied", true)
  }
  return
}
```

### [](https://gorm.io/docs/hooks.html#Deleting-an-object "Deleting an object")Deleting an object

Available hooks for deleting

```

BeforeDelete

AfterDelete

```

Code Example:

```

func (u *User) AfterDelete(tx *gorm.DB) (err error) {
  if u.Confirmed {
    tx.Model(&Address{}).Where("user_id = ?", u.ID).Update("invalid", false)
  }
  return
}
```

### [](https://gorm.io/docs/hooks.html#Querying-an-object "Querying an object")Querying an object

Available hooks for querying

```


AfterFind
```

Code Example:

```
func (u *User) AfterFind(tx *gorm.DB) (err error) {
  if u.MemberShip == "" {
    u.MemberShip = "user"
  }
  return
}
```

## [](https://gorm.io/docs/hooks.html#Modify-current-operation "Modify current operation")Modify current operation

```
func (u *User) BeforeCreate(tx *gorm.DB) error {
  
  tx.Statement.Select("Name", "Age")
  tx.Statement.AddClause(clause.OnConflict{DoNothing: true})

  
  
  var role Role
  err := tx.First(&role, "name = ?", user.Role).Error
  
  
  return err
}
```

[![GitHub tag (latest SemVer)](https://img.shields.io/github/v/tag/go-gorm/gorm?label=Latest%20GORM%20Release&color=red&&style=for-the-badge&logo=go&logoColor=red)](https://gorm.io/docs/v2_release_note.html)


Hooks

InfoSphere v2026.0.2 版本已经发布，增强多个功能模块，完善了更多的功能！

Hooks

Object Life Cycle

Hooks

Creating an object

Updating an object

Deleting an object

Querying an object

Modify current operation

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