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                # 設置 GORM 提供了 `Set`, `Get`, `InstanceSet`, `InstanceGet` 方法來允許用戶傳值給 [鉤子](http://v2.gorm.io/zh_CN/docs/hooks.html) 或其他方法 Gorm 中有一些特性用到了這種機制,如遷移表格時傳遞表格選項。 ```go // 創建表時添加表后綴 db.Set("gorm:table_options", "ENGINE=InnoDB").AutoMigrate(&User{}) ``` ## Set / Get 使用 `Set` / `Get` 傳遞設置到鉤子方法,例如: ```go type User struct { gorm.Model CreditCard CreditCard // ... } func (u *User) BeforeCreate(tx *gorm.DB) error { myValue, ok := tx.Get("my_value") // ok => true // myValue => 123 } type CreditCard struct { gorm.Model // ... } func (card *CreditCard) BeforeCreate(tx *gorm.DB) error { myValue, ok := tx.Get("my_value") // ok => true // myValue => 123 } myValue := 123 db.Set("my_value", myValue).Create(&User{}) ``` ## InstanceSet / InstanceGet 使用 `InstanceSet` / `InstanceGet` 傳遞設置到 `*Statement` 的鉤子方法,例如: ```go type User struct { gorm.Model CreditCard CreditCard // ... } func (u *User) BeforeCreate(tx *gorm.DB) error { myValue, ok := tx.InstanceGet("my_value") // ok => true // myValue => 123 } type CreditCard struct { gorm.Model // ... } // 在創建關聯時,GORM 創建了一個新 `*Statement`,所以它不能讀取到其它實例的設置 func (card *CreditCard) BeforeCreate(tx *gorm.DB) error { myValue, ok := tx.InstanceGet("my_value") // ok => false // myValue => nil } myValue := 123 db.InstanceSet("my_value", myValue).Create(&User{}) ```
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