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docs update
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@ -82,6 +82,8 @@ num, err := qs.Filter("User__Name", "slene").All(&posts)
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#### Use Raw sql
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If you don't like ORM,use Raw SQL to query / mapping without ORM setting
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```go
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var maps []Params
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num, err := o.Raw("SELECT id FROM user WHERE name = ?", "slene").Values(&maps)
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@ -1,144 +1,8 @@
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## Model Definition
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## 模型定义
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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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复杂的模型定义不是必须的,此功能用作数据库数据转换和自动建表
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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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note: 根据文档的更新,随时都可能更新这个 Model
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##### models.go:
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```go
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package main
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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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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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// 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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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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func (u *Profile) TableName() string {
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return "profile" // 自定义表名
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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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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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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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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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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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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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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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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), new(Profile))
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orm.RegisterModel(new(Post), new(Tag), new(Comment))
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}
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```
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## Field Type
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现在 orm 支持下面的字段形式
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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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关系型的字段,其字段类型取决于对应的主键。
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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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## Field Options
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## Struct Tag 设置参数
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```go
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orm:"null;rel(fk)"
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```
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@ -175,13 +39,26 @@ orm:"null;rel(fk)"
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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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Name `orm:"column(user_name)"`
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```
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#### default
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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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type User struct {
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...
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Status int `orm:"default(1)"`
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```
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仅当进行 orm.Manager 初始化时才会赋值
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```go
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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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u := NewUser()
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fmt.Println(u.Status) // 1
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```
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#### choices
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@ -219,7 +96,7 @@ Updated time.Time `auto_now`
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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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## 表关系设置
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#### rel / reverse
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@ -290,4 +167,33 @@ type Profile struct {
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User *User `orm:"reverse(one)" json:"-"`
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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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```
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```
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## Struct Field 类型与数据库的对应
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现在 orm 支持下面的字段形式
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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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关系型的字段,其字段类型取决于对应的主键。
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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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@ -1,16 +1,14 @@
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## Object
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## 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 := NewUser()
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user.UserName = "slene"
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user.Password = "password"
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user.Email = "vslene@gmail.com"
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user.Name = "slene"
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fmt.Println(o.Insert(user))
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user.UserName = "Your"
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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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@ -27,16 +25,14 @@ if err == sql.ErrNoRows {
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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.UserName)
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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.UserName = "slene"
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user.Password = "password"
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user.Email = "vslene@gmail.com"[]()
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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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@ -49,7 +45,7 @@ fmt.Println(user.Id)
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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.UserName = "MyName"
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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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@ -1,6 +1,40 @@
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## Orm
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## Orm 使用方法
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beego/orm 的使用例子
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后文例子如无特殊说明都以这个为基础。
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##### models.go:
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```go
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package main
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import (
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"github.com/astaxie/beego/orm"
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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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Name string
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Profile *Profile `orm:"rel(one)"` // OneToOne relation
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orm.Manager // 每个model都需要定义orm.Manager
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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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User *User `orm:"reverse(one)"` // 设置反向关系(可选)
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orm.Manager
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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), new(Profile))
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}
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```
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##### main.go
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```go
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package main
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@ -22,20 +56,18 @@ func main() {
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profile := NewProfile()
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profile.Age = 30
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profile.Money = 9.8
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user := NewUser()
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user.Profile = profile
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user.UserName = "slene"
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user.Password = "password"
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user.Email = "vslene@gmail.com"
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user.IsActive = true
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user.Name = "slene"
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fmt.Println(o.Insert(profile))
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fmt.Println(o.Insert(user))
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}
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```
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## 数据库的设置
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#### RegisterDriver
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三种数据库类型
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@ -66,12 +98,14 @@ orm 必须注册一个名称为 `default` 的数据库,用以作为默认使
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orm.RegisterDataBase("default", "mysql", "root:root@/orm_test?charset=utf8", 30)
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```
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## Ormer
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## ORM 接口使用
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使用 orm 必然接触的 Ormer 接口,我们来熟悉一下
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```go
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var o Ormer
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o = orm.NewOrm() // 创建一个 Ormer
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// NewOrm 的同时会执行一次 orm.BootStrap,用以验证模型之间的定义并缓存。
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// NewOrm 的同时会执行 orm.BootStrap (整个 app 只执行一次),用以验证模型之间的定义并缓存。
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```
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* type Ormer interface {
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@ -84,9 +118,9 @@ o = orm.NewOrm() // 创建一个 Ormer
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* [LoadRel(Modeler, string) (int64, error)](Object.md#loadRel)
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* [QueryTable(interface{}) QuerySeter](#querytable)
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* [Using(string) error](#using)
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* [Begin() error](Transaction.md#begin)
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* [Commit() error](Transaction.md#commit)
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* [Rollback() error](Transaction.md#rollback)
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* [Begin() error](Transaction.md)
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* [Commit() error](Transaction.md)
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* [Rollback() error](Transaction.md)
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* [Raw(string, ...interface{}) RawSeter](#raw)
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* [Driver() Driver](#driver)
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* }
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@ -133,7 +167,7 @@ Raw 函数,返回一个 [RawSeter](Raw.md) 用以对设置的 sql 语句和参
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```go
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o := NewOrm()
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var r RawSeter
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r = o.Raw("UPDATE user SET user_name = ? WHERE user_name = ?", "testing", "slene")
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r = o.Raw("UPDATE user SET name = ? WHERE name = ?", "testing", "slene")
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```
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#### Driver
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@ -1,4 +1,4 @@
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## Query
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## 高级查询
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orm 以 **QuerySeter** 来组织查询,每个返回 **QuerySeter** 的方法都会获得一个新的 **QuerySeter** 对象。
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@ -29,8 +29,8 @@ qs.Filter("profile__age__gt", 18) // WHERE profile.age > 18
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qs.Filter("profile__age__gte", 18) // WHERE profile.age >= 18
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qs.Filter("profile__age__in", 18, 20) // WHERE profile.age IN (18, 20)
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qs.Filter("profile__age__in", 18, 20).Exclude("profile__money__lt", 1000)
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// WHERE profile.age IN (18, 20) AND NOT profile.money < 1000
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qs.Filter("profile__age__in", 18, 20).Exclude("profile__lt", 1000)
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// WHERE profile.age IN (18, 20) AND NOT profile_id < 1000
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```
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## Operators
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@ -51,27 +51,27 @@ qs.Filter("profile__age__in", 18, 20).Exclude("profile__money__lt", 1000)
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Filter / Exclude / Condition expr 的默认值
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```go
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qs.Filter("user_name", "slene") // WHERE user_name = 'slene'
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qs.Filter("user_name__exact", "slene") // WHERE user_name = 'slene'
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qs.Filter("name", "slene") // WHERE name = 'slene'
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qs.Filter("name__exact", "slene") // WHERE name = 'slene'
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// 使用 = 匹配,大小写是否敏感取决于数据表使用的 collation
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qs.Filter("profile", nil) // WHERE profile_id IS NULL
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```
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#### iexact
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```go
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qs.Filter("user_name__iexact", "slene")
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// WHERE user_name LIKE 'slene'
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qs.Filter("name__iexact", "slene")
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// WHERE name LIKE 'slene'
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// 大小写不敏感,匹配任意 'Slene' 'sLENE'
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```
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#### contains
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```go
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qs.Filter("user_name__contains", "slene")
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// WHERE user_name LIKE BINARY '%slene%'
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qs.Filter("name__contains", "slene")
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// WHERE name LIKE BINARY '%slene%'
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// 大小写敏感, 匹配包含 slene 的字符
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```
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#### icontains
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```go
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qs.Filter("user_name__icontains", "slene")
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// WHERE user_name LIKE '%slene%'
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qs.Filter("name__icontains", "slene")
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// WHERE name LIKE '%slene%'
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// 大小写不敏感, 匹配任意 'im Slene', 'im sLENE'
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```
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#### in
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@ -97,26 +97,26 @@ qs.Filter("profile__age__lte", 18)
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```
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#### startswith
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```go
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qs.Filter("user_name__startswith", "slene")
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// WHERE user_name LIKE BINARY 'slene%'
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qs.Filter("name__startswith", "slene")
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// WHERE name LIKE BINARY 'slene%'
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// 大小写敏感, 匹配以 'slene' 起始的字符串
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```
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#### istartswith
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```go
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qs.Filter("user_name__istartswith", "slene")
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// WHERE user_name LIKE 'slene%'
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qs.Filter("name__istartswith", "slene")
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// WHERE name LIKE 'slene%'
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// 大小写不敏感, 匹配任意以 'slene', 'Slene' 起始的字符串
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```
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#### endswith
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```go
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qs.Filter("user_name__endswith", "slene")
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// WHERE user_name LIKE BINARY '%slene'
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qs.Filter("name__endswith", "slene")
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// WHERE name LIKE BINARY '%slene'
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// 大小写敏感, 匹配以 'slene' 结束的字符串
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```
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#### iendswith
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```go
|
||||
qs.Filter("user_name__startswith", "slene")
|
||||
// WHERE user_name LIKE '%slene'
|
||||
qs.Filter("name__startswith", "slene")
|
||||
// WHERE name LIKE '%slene'
|
||||
// 大小写不敏感, 匹配任意以 'slene', 'Slene' 结束的字符串
|
||||
```
|
||||
#### isnull
|
||||
@ -128,9 +128,9 @@ qs.Filter("profile_id__isnull", true)
|
||||
qs.Filter("profile__isnull", false)
|
||||
// WHERE profile_id IS NOT NULL
|
||||
```
|
||||
## QuerySeter
|
||||
## 高级查询接口使用
|
||||
|
||||
QuerySeter 当前支持的方法
|
||||
QuerySeter 是高级查询使用的接口,我们来熟悉下他的接口方法
|
||||
|
||||
* type QuerySeter interface {
|
||||
* [Filter(string, ...interface{}) QuerySeter](#filter)
|
||||
@ -151,24 +151,30 @@ QuerySeter 当前支持的方法
|
||||
* [ValuesFlat(*ParamsList, string) (int64, error)](#valuesflat)
|
||||
* }
|
||||
|
||||
每个返回 QuerySeter 的 api 调用时都会新建一个 QuerySeter,不影响之前创建的。
|
||||
* 每个返回 QuerySeter 的 api 调用时都会新建一个 QuerySeter,不影响之前创建的。
|
||||
|
||||
* 高级查询使用 Filter 和 Exclude 来做常用的条件查询。囊括两种清晰的过滤规则:包含, 排除
|
||||
|
||||
#### Filter
|
||||
|
||||
用来过滤查询结果,起到 **包含条件** 的作用
|
||||
|
||||
多个 Filter 之间使用 `AND` 连接
|
||||
```go
|
||||
qs.Filter("profile__isnull", true).Filter("user_name", "slene")
|
||||
// WHERE profile_id IS NULL AND user_name = 'slene'
|
||||
qs.Filter("profile__isnull", true).Filter("name", "slene")
|
||||
// WHERE profile_id IS NULL AND name = 'slene'
|
||||
```
|
||||
|
||||
#### Exclude
|
||||
|
||||
用来过滤查询结果,起到 **排除条件** 的作用
|
||||
|
||||
使用 `NOT` 排除条件
|
||||
|
||||
多个 Exclude 之间使用 `AND` 连接
|
||||
```go
|
||||
qs.Exclude("profile__isnull", true).Filter("user_name", "slene")
|
||||
// WHERE NOT profile_id IS NULL AND user_name = 'slene'
|
||||
qs.Exclude("profile__isnull", true).Filter("name", "slene")
|
||||
// WHERE NOT profile_id IS NULL AND name = 'slene'
|
||||
```
|
||||
|
||||
#### SetCond
|
||||
@ -183,7 +189,7 @@ qs := orm.QueryTable("user")
|
||||
qs = qs.SetCond(cond1)
|
||||
// WHERE ... AND ... AND NOT ... OR ...
|
||||
|
||||
cond2 := cond.AndCond(cond1).OrCond(cond.And("user_name", "slene"))
|
||||
cond2 := cond.AndCond(cond1).OrCond(cond.And("name", "slene"))
|
||||
qs = qs.SetCond(cond2).Count()
|
||||
// WHERE (... AND ... AND NOT ... OR ...) OR ( ... )
|
||||
```
|
||||
@ -228,8 +234,8 @@ qs.Offset(20)
|
||||
qs.OrderBy("id", "-profile__age")
|
||||
// ORDER BY id ASC, profile.age DESC
|
||||
|
||||
qs.OrderBy("-profile__money", "profile")
|
||||
// ORDER BY profile.money DESC, profile_id ASC
|
||||
qs.OrderBy("-profile__age", "profile")
|
||||
// ORDER BY profile.age DESC, profile_id ASC
|
||||
```
|
||||
|
||||
#### RelatedSel
|
||||
@ -260,19 +266,19 @@ fmt.Printf("Count Num: %s, %s", cnt, err)
|
||||
#### Update
|
||||
依据当前查询条件,进行批量更新操作
|
||||
```go
|
||||
num, err := o.QueryTable("user").Filter("user_name", "slene").Update(orm.Params{
|
||||
"user_name": "astaxie",
|
||||
num, err := o.QueryTable("user").Filter("name", "slene").Update(orm.Params{
|
||||
"name": "astaxie",
|
||||
})
|
||||
fmt.Printf("Affected Num: %s, %s", num, err)
|
||||
// SET user_name = "astaixe" WHERE user_name = "slene"
|
||||
// SET name = "astaixe" WHERE name = "slene"
|
||||
```
|
||||
|
||||
#### Delete
|
||||
依据当前查询条件,进行批量删除操作
|
||||
```go
|
||||
num, err := o.QueryTable("user").Filter("user_name", "slene").Delete()
|
||||
num, err := o.QueryTable("user").Filter("name", "slene").Delete()
|
||||
fmt.Printf("Affected Num: %s, %s", num, err)
|
||||
// DELETE FROM user WHERE user_name = "slene"
|
||||
// DELETE FROM user WHERE name = "slene"
|
||||
```
|
||||
|
||||
#### PrepareInsert
|
||||
@ -282,7 +288,7 @@ fmt.Printf("Affected Num: %s, %s", num, err)
|
||||
```go
|
||||
var users []*User
|
||||
...
|
||||
qs := dORM.QueryTable("user")
|
||||
qs := o.QueryTable("user")
|
||||
i, _ := qs.PrepareInsert()
|
||||
for _, user := range users {
|
||||
id, err := i.Insert(user)
|
||||
@ -290,8 +296,8 @@ for _, user := range users {
|
||||
...
|
||||
}
|
||||
}
|
||||
// PREPARE INSERT INTO user (`user_name`, ...) VALUES (?, ...)
|
||||
// EXECUTE INSERT INTO user (`user_name`, ...) VALUES ("slene", ...)
|
||||
// PREPARE INSERT INTO user (`name`, ...) VALUES (?, ...)
|
||||
// EXECUTE INSERT INTO user (`name`, ...) VALUES ("slene", ...)
|
||||
// EXECUTE ...
|
||||
// ...
|
||||
i.Close() // 别忘记关闭 statement
|
||||
@ -301,7 +307,7 @@ i.Close() // 别忘记关闭 statement
|
||||
返回对应的结果集对象
|
||||
```go
|
||||
var users []*User
|
||||
num, err := o.QueryTable("user").Filter("user_name", "slene").All(&users)
|
||||
num, err := o.QueryTable("user").Filter("name", "slene").All(&users)
|
||||
fmt.Printf("Returned Rows Num: %s, %s", num, err)
|
||||
```
|
||||
|
||||
@ -311,7 +317,7 @@ fmt.Printf("Returned Rows Num: %s, %s", num, err)
|
||||
|
||||
```go
|
||||
var user *User
|
||||
err := o.QueryTable("user").Filter("user_name", "slene").One(&user)
|
||||
err := o.QueryTable("user").Filter("name", "slene").One(&user)
|
||||
if err == orm.ErrMultiRows {
|
||||
// 多条的时候报错
|
||||
fmt.Printf("Returned Multi Rows Not One")
|
||||
@ -333,7 +339,7 @@ num, err := o.QueryTable("user").Values(&maps)
|
||||
if err != nil {
|
||||
fmt.Printf("Result Nums: %d\n", num)
|
||||
for _, m := range maps {
|
||||
fmt.Println(m["Id"], m["UserName"])
|
||||
fmt.Println(m["Id"], m["Name"])
|
||||
}
|
||||
}
|
||||
```
|
||||
@ -346,11 +352,11 @@ if err != nil {
|
||||
|
||||
```go
|
||||
var maps []orm.Params
|
||||
num, err := o.QueryTable("user").Values(&maps, "id", "user_name", "profile", "profile__age")
|
||||
num, err := o.QueryTable("user").Values(&maps, "id", "name", "profile", "profile__age")
|
||||
if err != nil {
|
||||
fmt.Printf("Result Nums: %d\n", num)
|
||||
for _, m := range maps {
|
||||
fmt.Println(m["Id"], m["UserName"], m["Profile"], m["Profile__Age"])
|
||||
fmt.Println(m["Id"], m["Name"], m["Profile"], m["Profile__Age"])
|
||||
// map 中的数据都是展开的,没有复杂的嵌套
|
||||
}
|
||||
}
|
||||
@ -379,11 +385,11 @@ if err != nil {
|
||||
|
||||
```go
|
||||
var lists []orm.ParamsList
|
||||
num, err := o.QueryTable("user").ValuesList(&lists, "user_name", "profile__age")
|
||||
num, err := o.QueryTable("user").ValuesList(&lists, "name", "profile__age")
|
||||
if err != nil {
|
||||
fmt.Printf("Result Nums: %d\n", num)
|
||||
for _, row := range lists {
|
||||
fmt.Printf("UserName: %s, Age: %s\m", row[0], row[1])
|
||||
fmt.Printf("Name: %s, Age: %s\m", row[0], row[1])
|
||||
}
|
||||
}
|
||||
```
|
||||
@ -394,7 +400,7 @@ if err != nil {
|
||||
|
||||
```go
|
||||
var list orm.ParamsList
|
||||
num, err := o.QueryTable("user").ValuesFlat(&list, "user_name")
|
||||
num, err := o.QueryTable("user").ValuesFlat(&list, "name")
|
||||
if err != nil {
|
||||
fmt.Printf("Result Nums: %d\n", num)
|
||||
fmt.Printf("All User Names: %s", strings.Join(list, ", ")
|
||||
|
@ -1,17 +1,19 @@
|
||||
## 文档目录
|
||||
|
||||
1. [模型定义](Models.md)
|
||||
- [支持的 Field 类型](Models.md#field-type)
|
||||
- [Field 设置参数](Models.md#field-options)
|
||||
- [关系型 Field 设置](Models.md#relation-field-options)
|
||||
2. Custom Fields
|
||||
3. [Orm 使用方法](Orm.md)
|
||||
- [Ormer 接口](Orm.md#ormer)
|
||||
4. [对象操作](Object.md)
|
||||
5. [复杂查询](Query.md)
|
||||
- [查询使用的表达式语法](Query.md#expr)
|
||||
- [查询支持的操作符号](Query.md#operators)
|
||||
- [QuerySeter 接口](Query.md#queryseter)
|
||||
6. Raw
|
||||
7. Transaction
|
||||
|
||||
1. [Orm 使用方法](Orm.md)
|
||||
- [数据库的设置](Orm.md#数据库的设置)
|
||||
- [ORM 接口使用](Orm.md#orm-接口使用)
|
||||
2. [对象的CRUD操作](Object.md)
|
||||
3. [高级查询](Query.md)
|
||||
- [使用的表达式语法](Query.md#expr)
|
||||
- [支持的操作符号](Query.md#operators)
|
||||
- [高级查询接口使用](Query.md#高级查询接口使用)
|
||||
4. [使用SQL语句进行查询](Raw.md)
|
||||
5. [事务处理](Transaction.md)
|
||||
6. [模型定义](Models.md)
|
||||
- [Struct Tag 设置参数](Models.md#struct-tag-设置参数)
|
||||
- [表关系设置](Models.md#表关系设置)
|
||||
- [Struct Field 类型与数据库的对应](Models.md#struct-field-类型与数据库的对应)
|
||||
7. Custom Fields
|
||||
8. Faq
|
||||
|
108
orm/docs/zh/Raw.md
Normal file
108
orm/docs/zh/Raw.md
Normal file
@ -0,0 +1,108 @@
|
||||
## 使用SQL语句进行查询
|
||||
|
||||
使用 Raw SQL 查询,无需使用 ORM 表定义
|
||||
|
||||
创建一个 **RawSeter**
|
||||
|
||||
```go
|
||||
o := NewOrm()
|
||||
var r RawSeter
|
||||
r = o.Raw("UPDATE user SET name = ? WHERE name = ?", "testing", "slene")
|
||||
```
|
||||
|
||||
* type RawSeter interface {
|
||||
* [Exec() (int64, error)](#exec)
|
||||
* [QueryRow(...interface{}) error](#queryrow)
|
||||
* [QueryRows(...interface{}) (int64, error)](#queryrows)
|
||||
* [SetArgs(...interface{}) RawSeter](#setargs)
|
||||
* [Values(*[]Params) (int64, error)](#values)
|
||||
* [ValuesList(*[]ParamsList) (int64, error)](#valueslist)
|
||||
* [ValuesFlat(*ParamsList) (int64, error)](#valuesflat)
|
||||
* [Prepare() (RawPreparer, error)](#prepare)
|
||||
* }
|
||||
|
||||
#### Exec
|
||||
|
||||
执行sql语句
|
||||
|
||||
```go
|
||||
num, err := r.Exec()
|
||||
```
|
||||
|
||||
#### QueryRow
|
||||
|
||||
TODO
|
||||
|
||||
#### QueryRows
|
||||
|
||||
TODO
|
||||
|
||||
#### SetArgs
|
||||
|
||||
改变 Raw(sql, args...) 中的 args 参数,返回一个新的 RawSeter
|
||||
|
||||
用于单条 sql 语句,重复利用,替换参数然后执行。
|
||||
|
||||
```go
|
||||
num, err := r.SetArgs("set name", "name1").Exec()
|
||||
num, err := r.SetArgs("set name", "name2").Exec()
|
||||
```
|
||||
#### Values / ValuesList / ValuesFlat
|
||||
|
||||
Raw SQL 查询获得的结果集 Value 为 `string` 类型,NULL 字段的值为空 ``
|
||||
|
||||
#### Values
|
||||
|
||||
|
||||
返回结果集的 key => value 值
|
||||
|
||||
```go
|
||||
var maps []orm.Params
|
||||
num, err = o.Raw("SELECT user_name FROM user WHERE status = ?", 1).Values(&maps)
|
||||
if err == nil && num > 0 {
|
||||
fmt.Println(maps[0]["user_name"]) // slene
|
||||
}
|
||||
```
|
||||
|
||||
#### ValuesList
|
||||
|
||||
返回结果集 slice
|
||||
|
||||
```go
|
||||
var lists []orm.ParamsList
|
||||
num, err = o.Raw("SELECT user_name FROM user WHERE status = ?", 1).ValuesList(&lists)
|
||||
if err == nil && num > 0 {
|
||||
fmt.Println(lists[0][0]) // slene
|
||||
}
|
||||
```
|
||||
|
||||
#### ValuesFlat
|
||||
|
||||
返回单一字段的平铺 slice 数据
|
||||
|
||||
```go
|
||||
var list orm.ParamsList
|
||||
num, err = o.Raw("SELECT id FROM user WHERE id < ?", 10).ValuesList(&list)
|
||||
if err == nil && num > 0 {
|
||||
fmt.Println(list) // []{"1","2","3",...}
|
||||
}
|
||||
```
|
||||
|
||||
#### Prepare
|
||||
|
||||
用于一次 prepare 多次 exec,以提高批量执行的速度。
|
||||
|
||||
```go
|
||||
p, err := o.Raw("UPDATE user SET name = ? WHERE name = ?").Prepare()
|
||||
num, err := p.Exec("testing", "slene")
|
||||
num, err = p.Exec("testing", "astaxie")
|
||||
...
|
||||
...
|
||||
p.Close() // 别忘记关闭 statement
|
||||
```
|
||||
|
||||
## FAQ
|
||||
|
||||
1. 我的 app 需要支持多类型数据库,如何在使用 Raw SQL 的时候判断当前使用的数据库类型。
|
||||
|
||||
使用 Ormer 的 [Driver方法](Orm.md#driver) 可以进行判断
|
3
orm/docs/zh/Transaction.md
Normal file
3
orm/docs/zh/Transaction.md
Normal file
@ -0,0 +1,3 @@
|
||||
## 事务处理
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user