60 lines
1.1 KiB
Markdown
60 lines
1.1 KiB
Markdown
## 对象的CRUD操作
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对 object 操作简单的三个方法 Read / Insert / Update / Delete
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```go
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o := orm.NewOrm()
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user := new(User)
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user.Name = "slene"
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fmt.Println(o.Insert(user))
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user.Name = "Your"
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fmt.Println(o.Update(user))
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fmt.Println(o.Read(user))
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fmt.Println(o.Delete(user))
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```
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### Read
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```go
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o := orm.NewOrm()
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user := User{Id: 1}
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err = o.Read(&user)
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if err == sql.ErrNoRows {
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fmt.Println("查询不到")
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} else if err == orm.ErrMissPK {
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fmt.Println("找不到主键")
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} else {
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fmt.Println(user.Id, user.Name)
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}
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```
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### Insert
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```go
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o := orm.NewOrm()
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var user User
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user.Name = "slene"
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user.IsActive = true
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fmt.Println(o.Insert(&user))
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fmt.Println(user.Id)
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```
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创建后会自动对 auto 的 field 赋值
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### Update
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```go
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o := orm.NewOrm()
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user := User{Id: 1}
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if o.Read(&user) == nil {
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user.Name = "MyName"
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o.Update(&user)
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}
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```
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### Delete
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```go
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o := orm.NewOrm()
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o.Delete(&User{Id: 1})
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```
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Delete 操作会对反向关系进行操作，此例中 Post 拥有一个到 User 的外键。删除 User 的时候。如果 on_delete 设置为默认的级联操作，将删除对应的 Post
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删除以后会清除 auto field 的值
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