296 lines
		
	
	
		
			7.3 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
			
		
		
	
	
			296 lines
		
	
	
		
			7.3 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
| ## Model Definition
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| 
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| 比较全面的 Model 定义例子,后文所有的例子如无特殊说明都以这个为基础。
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| 
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| 当前还没有完成自动创建表的功能,所以提供一个 [Models.sql](Models.sql) 测试
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| 
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| note: 根据文档的更新,随时都可能更新这个 Model
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| 
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| ##### models.go:
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| 
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| ```go
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| package main
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| 
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| import (
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| 	"github.com/astaxie/beego/orm"
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| 	"time"
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| )
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| 
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| type User struct {
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| 	Id          int        `orm:"auto"`            // 设置为auto主键
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| 	UserName    string     `orm:"size(30);unique"` // 设置字段为unique
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| 	Email       string     `orm:"size(100)"`       // 设置string字段长度时,会使用varchar类型
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| 	Password    string     `orm:"size(100)"`
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| 	Status      int16      `orm:"choices(0,1,2,3);defalut(0)"` // choices设置可选值
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| 	IsStaff     bool       `orm:"default(false)"`              // default设置默认值
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| 	IsActive    bool       `orm:"default(0)"`
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| 	Created     time.Time  `orm:"auto_now_add;type(date)"`           // 创建时自动设置时间
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| 	Updated     time.Time  `orm:"auto_now"`                          // 每次更新时自动设置时间
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| 	Profile     *Profile   `orm:"null;rel(one);on_delete(set_null)"` // OneToOne relation, 级联删除时设置为NULL
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| 	Posts       []*Post `orm:"reverse(many)" json:"-"` // fk 的反向关系
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| 	orm.Manager `json:"-"` // 每个model都需要定义orm.Manager
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| }
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| 
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| // 定义NewModel进行orm.Manager的初始化(必须)
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| func NewUser() *User {
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| 	obj := new(User)
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| 	obj.Manager.Init(obj)
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| 	return obj
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| }
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| 
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| type Profile struct {
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| 	Id          int     `orm:"auto"`
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| 	Age         int16   ``
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| 	Money       float64 ``
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| 	User        *User   `orm:"reverse(one)" json:"-"` // 设置反向关系(字段可选)
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| 	orm.Manager `json:"-"`
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| }
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| 
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| func (u *Profile) TableName() string {
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| 	return "profile" // 自定义表名
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| }
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| 
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| func NewProfile() *Profile {
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| 	obj := new(Profile)
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| 	obj.Manager.Init(obj)
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| 	return obj
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| }
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| 
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| type Post struct {
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| 	Id          int       `orm:"auto"`
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| 	User        *User     `orm:"rel(fk)"` // RelForeignKey relation
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| 	Title       string    `orm:"size(60)"`
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| 	Content     string    ``
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| 	Created     time.Time ``
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| 	Updated     time.Time ``
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| 	Tags        []*Tag    `orm:"rel(m2m)"` // ManyToMany relation
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| 	orm.Manager `json:"-"`
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| }
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| 
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| func NewPost() *Post {
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| 	obj := new(Post)
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| 	obj.Manager.Init(obj)
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| 	return obj
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| }
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| 
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| type Tag struct {
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| 	Id          int     `orm:"auto"`
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| 	Name        string  `orm:"size(30)"`
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| 	Status      int16   `orm:"choices(0,1,2);default(0)"`
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| 	Posts       []*Post `orm:"reverse(many)" json:"-"`
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| 	orm.Manager `json:"-"`
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| }
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| 
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| func NewTag() *Tag {
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| 	obj := new(Tag)
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| 	obj.Manager.Init(obj)
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| 	return obj
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| }
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| 
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| type Comment struct {
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| 	Id          int       `orm:"auto"`
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| 	Post        *Post     `orm:"rel(fk)"`
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| 	Content     string    ``
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| 	Parent      *Comment  `orm:"null;rel(fk)"` // null设置allow NULL
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| 	Status      int16     `orm:"choices(0,1,2);default(0)"`
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| 	Created     time.Time `orm:"auto_now_add"`
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| 	orm.Manager `json:"-"`
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| }
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| 
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| func NewComment() *Comment {
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| 	obj := new(Comment)
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| 	obj.Manager.Init(obj)
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| 	return obj
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| }
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| 
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| func init() {
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| 	// 需要在init中注册定义的model
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| 	orm.RegisterModel(new(User))
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| 	orm.RegisterModel(new(Profile))
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| 	orm.RegisterModel(new(Post))
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| 	orm.RegisterModel(new(Tag))
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| 	orm.RegisterModel(new(Comment))
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| }
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| ```
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| 
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| ## Field Type
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| 
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| 现在 orm 支持下面的字段形式
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| 
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| | go type		   | field type  | mysql type
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| | :---   	   | :---        | :---
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| | bool | TypeBooleanField | tinyint
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| | string | TypeCharField | varchar
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| | string | TypeTextField | longtext
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| | time.Time | TypeDateField | date
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| | time.TIme | TypeDateTimeField | datetime
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| |  int16 |TypeSmallIntegerField | int(4)
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| |  int, int32 |TypeIntegerField | int(11)
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| |  int64 |TypeBigIntegerField | bigint(20)
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| |  uint, uint16 |TypePositiveSmallIntegerField | int(4) unsigned
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| |  uint32 |TypePositiveIntegerField | int(11) unsigned
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| |  uint64 |TypePositiveBigIntegerField | bigint(20) unsigned
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| | float32, float64 | TypeFloatField | double
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| | float32, float64 | TypeDecimalField | double(digits, decimals)
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| 
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| 关系型的字段,其字段类型取决于对应的主键。
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| 
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| * RelForeignKey
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| * RelOneToOne
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| * RelManyToMany
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| * RelReverseOne
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| * RelReverseMany
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| 
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| ## Field Options
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| ```go
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| orm:"null;rel(fk)"
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| ```
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| 	
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| 通常每个 Field 的 StructTag 里包含两种类型的设置,类似 null 的 bool 型设置,还有 类似 rel(fk) 的指定值设置,bool 型默认为 false,指定以后即表示为 true
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| 
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| 多个设置间使用 `;` 分隔,设置的值如果是多个,使用 `,` 分隔。
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| 
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| #### auto
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| 
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| 设置为 Autoincrement Primary Key
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| 
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| #### pk
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| 
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| 设置为 Primary Key
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| 
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| #### null
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| 
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| 数据库表默认为 `NOT NULL`,设置 null 代表 `ALLOW NULL`
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| 
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| #### blank
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| 
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| 设置 string 类型的字段允许为空,否则 clean 会返回错误
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| 
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| #### index
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| 
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| 为字段增加索引
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| 
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| #### unique
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| 
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| 为字段增加 unique 键
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| 
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| #### column
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| 
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| 为字段设置 db 字段的名称
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| ```go
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| UserName `orm:"column(db_user_name)"`
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| ```
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| #### default
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| 
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| 为字段设置默认值,类型必须符合
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| ```go
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| Status int `orm:"default(1)"`
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| ```
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| #### choices
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| 
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| 为字段设置一组可选的值,类型必须符合。其他值 clean 会返回错误
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| ```go
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| Status int `orm:"choices(1,2,3,4)"`
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| ```
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| #### size (string)
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| 
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| string 类型字段设置 size 以后,db type 将使用 varchar
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| ```go
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| Title string `orm:"size(60)"`
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| ```
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| #### digits / decimals
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| 
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| 设置 float32, float64 类型的浮点精度
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| ```go
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| Money float64 `orm:"digits(12);decimals(4)"`
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| ```
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| 总长度 12 小数点后 4 位 eg: `99999999.9999`
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| 
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| #### auto_now / auto_now_add
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| ```go
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| Created     time.Time `auto_now_add`
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| Updated     time.Time `auto_now`
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| ```
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| * auto_now 每次 model 保存时都会对时间自动更新
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| * auto_now_add 第一次保存时才设置时间
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| 
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| 对于批量的 update 此设置是不生效的
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| 
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| #### type
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| 
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| 设置为 date, time.Time 字段的对应 db 类型使用 date
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| ```go
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| Created time.Time `orm:"auto_now_add;type(date)"`
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| ```
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| ## Relation Field Options
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| 
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| #### rel / reverse
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| 
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| **RelOneToOne**:
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| ```go
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| type User struct {
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| 	...
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| 	Profile *Profile `orm:"null;rel(one);on_delete(set_null)"`
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| ```
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| 对应的反向关系 **RelReverseOne**:
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| ```go
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| type Profile struct {
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| 	...
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| 	User *User `orm:"reverse(one)" json:"-"`
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| ```
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| **RelForeignKey**:
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| ```go
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| type Post struct {
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| 	...
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| 	User*User `orm:"rel(fk)"` // RelForeignKey relation
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| ```
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| 对应的反向关系 **RelReverseMany**:
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| ```go
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| type User struct {
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| 	...
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| 	Posts []*Post `orm:"reverse(many)" json:"-"` // fk 的反向关系
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| ```
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| **RelManyToMany**:
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| ```go
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| type Post struct {
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| 	...
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| 	Tags []*Tag `orm:"rel(m2m)"` // ManyToMany relation
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| ```
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| 对应的反向关系 **RelReverseMany**:
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| ```go
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| type Tag struct {
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| 	...
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| 	Posts []*Post `orm:"reverse(many)" json:"-"`
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| ```
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| #### rel_table / rel_through
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| 
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| 此设置针对 `orm:"rel(m2m)"` 的关系字段
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| 
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| 	rel_table       设置自动生成的 m2m 关系表的名称
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| 	rel_through     如果要在 m2m 关系中使用自定义的 m2m 关系表
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| 	                通过这个设置其名称,格式为 pkg.path.ModelName
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| 	                eg: app.models.PostTagRel
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| 	                PostTagRel 表需要有到 Post 和 Tag 的关系
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| 
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| 当设置 rel_table 时会忽略 rel_through
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| 
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| #### on_delete
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| 
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| 设置对应的 rel 关系删除时,如何处理关系字段。
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| 
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| 	cascade        级联删除(默认值)
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| 	set_null       设置为 NULL,需要设置 null = true
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| 	set_default    设置为默认值,需要设置 default 值
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| 	do_nothing     什么也不做,忽略
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| 
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| ```go
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| type User struct {
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| 	...
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| 	Profile *Profile `orm:"null;rel(one);on_delete(set_null)"`
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| ...
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| type Profile struct {
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| 	...
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| 	User *User `orm:"reverse(one)" json:"-"`
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| 
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| // 删除 Profile 时将设置 User.Profile 的数据库字段为 NULL
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| ``` |