mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-04 14:46:57 -05:00
9.6 KiB
9.6 KiB
xorm
xorm是一个简单而强大的Go语言ORM库. 通过它可以使数据库操作非常简便。
特性
-
支持Struct和数据库表之间的灵活映射,并支持自动同步
-
事务支持
-
同时支持原始SQL语句和ORM操作的混合执行
-
使用连写来简化调用
-
支持使用Id, In, Where, Limit, Join, Having, Table, Sql, Cols等函数和结构体等方式作为条件
-
支持级联加载Struct
-
支持缓存
-
支持根据数据库自动生成xorm的结构体
-
支持记录版本(即乐观锁)
-
内置SQL Builder支持
驱动支持
目前支持的Go数据库驱动和对应的数据库如下:
-
MyMysql: github.com/ziutek/mymysql/godrv
-
Postgres: github.com/lib/pq
-
Tidb: github.com/pingcap/tidb
-
SQLite: github.com/mattn/go-sqlite3
-
MsSql: github.com/lunny/godbc
-
Oracle: github.com/mattn/go-oci8 (试验性支持)
更新日志
-
v0.6.3
- 合并单元测试到主工程
- 新增
Exist
方法 - 新增
SumInt
方法 - Mysql新增读取和创建字段注释支持
- 新增
SetConnMaxLifetime
方法 - 修正了时间相关的Bug
- 修复了一些其它Bug
-
v0.6.2
- 重构Tag解析方式
- Get方法新增类似Scan的特性
- 新增 QueryString 方法
-
v0.6.0
- 去除对 ql 的支持
- 新增条件查询分析器 github.com/go-xorm/builder, 从因此
Where, And, Or
函数 将可以用builder.Cond
作为条件组合 - 新增 Sum, SumInt, SumInt64 和 NotIn 函数
- Bug修正
-
v0.5.0
- logging接口进行不兼容改变
- Bug修正
安装
go get github.com/go-xorm/xorm
文档
快速开始
- 第一步创建引擎,driverName, dataSourceName和database/sql接口相同
engine, err := xorm.NewEngine(driverName, dataSourceName)
- 定义一个和表同步的结构体,并且自动同步结构体到数据库
type User struct {
Id int64
Name string
Salt string
Age int
Passwd string `xorm:"varchar(200)"`
Created time.Time `xorm:"created"`
Updated time.Time `xorm:"updated"`
}
err := engine.Sync2(new(User))
Query
最原始的也支持SQL语句查询,返回的结果类型为 []map[string][]byte。QueryString
返回 []map[string]string
results, err := engine.Query("select * from user")
results, err := engine.QueryString("select * from user")
Exec
执行一个SQL语句
affected, err := engine.Exec("update user set age = ? where name = ?", age, name)
- 插入一条或者多条记录
affected, err := engine.Insert(&user)
// INSERT INTO struct () values ()
affected, err := engine.Insert(&user1, &user2)
// INSERT INTO struct1 () values ()
// INSERT INTO struct2 () values ()
affected, err := engine.Insert(&users)
// INSERT INTO struct () values (),(),()
affected, err := engine.Insert(&user1, &users)
// INSERT INTO struct1 () values ()
// INSERT INTO struct2 () values (),(),()
- 查询单条记录
has, err := engine.Get(&user)
// SELECT * FROM user LIMIT 1
has, err := engine.Where("name = ?", name).Desc("id").Get(&user)
// SELECT * FROM user WHERE name = ? ORDER BY id DESC LIMIT 1
var name string
has, err := engine.Where("id = ?", id).Cols("name").Get(&name)
// SELECT name FROM user WHERE id = ?
var id int64
has, err := engine.Where("name = ?", name).Cols("id").Get(&id)
// SELECT id FROM user WHERE name = ?
var valuesMap = make(map[string]string)
has, err := engine.Where("id = ?", id).Get(&valuesMap)
// SELECT * FROM user WHERE id = ?
var valuesSlice = make([]interface{}, len(cols))
has, err := engine.Where("id = ?", id).Cols(cols...).Get(&valuesSlice)
// SELECT col1, col2, col3 FROM user WHERE id = ?
- 检测记录是否存在
has, err := testEngine.Exist(new(RecordExist))
// SELECT * FROM record_exist LIMIT 1
has, err = testEngine.Exist(&RecordExist{
Name: "test1",
})
// SELECT * FROM record_exist WHERE name = ? LIMIT 1
has, err = testEngine.Where("name = ?", "test1").Exist(&RecordExist{})
// SELECT * FROM record_exist WHERE name = ? LIMIT 1
has, err = testEngine.SQL("select * from record_exist where name = ?", "test1").Exist()
// select * from record_exist where name = ?
has, err = testEngine.Table("record_exist").Exist()
// SELECT * FROM record_exist LIMIT 1
has, err = testEngine.Table("record_exist").Where("name = ?", "test1").Exist()
// SELECT * FROM record_exist WHERE name = ? LIMIT 1
- 查询多条记录,当然可以使用Join和extends来组合使用
var users []User
err := engine.Where("name = ?", name).And("age > 10").Limit(10, 0).Find(&users)
// SELECT * FROM user WHERE name = ? AND age > 10 limit 0 offset 10
type Detail struct {
Id int64
UserId int64 `xorm:"index"`
}
type UserDetail struct {
User `xorm:"extends"`
Detail `xorm:"extends"`
}
var users []UserDetail
err := engine.Table("user").Select("user.*, detail.*")
Join("INNER", "detail", "detail.user_id = user.id").
Where("user.name = ?", name).Limit(10, 0).
Find(&users)
// SELECT user.*, detail.* FROM user INNER JOIN detail WHERE user.name = ? limit 0 offset 10
- 根据条件遍历数据库,可以有两种方式: Iterate and Rows
err := engine.Iterate(&User{Name:name}, func(idx int, bean interface{}) error {
user := bean.(*User)
return nil
})
// SELECT * FROM user
rows, err := engine.Rows(&User{Name:name})
// SELECT * FROM user
defer rows.Close()
bean := new(Struct)
for rows.Next() {
err = rows.Scan(bean)
}
- 更新数据,除非使用Cols,AllCols函数指明,默认只更新非空和非0的字段
affected, err := engine.Id(1).Update(&user)
// UPDATE user SET ... Where id = ?
affected, err := engine.Update(&user, &User{Name:name})
// UPDATE user SET ... Where name = ?
var ids = []int64{1, 2, 3}
affected, err := engine.In(ids).Update(&user)
// UPDATE user SET ... Where id IN (?, ?, ?)
// force update indicated columns by Cols
affected, err := engine.Id(1).Cols("age").Update(&User{Name:name, Age: 12})
// UPDATE user SET age = ?, updated=? Where id = ?
// force NOT update indicated columns by Omit
affected, err := engine.Id(1).Omit("name").Update(&User{Name:name, Age: 12})
// UPDATE user SET age = ?, updated=? Where id = ?
affected, err := engine.Id(1).AllCols().Update(&user)
// UPDATE user SET name=?,age=?,salt=?,passwd=?,updated=? Where id = ?
- 删除记录,需要注意,删除必须至少有一个条件,否则会报错。要清空数据库可以用EmptyTable
affected, err := engine.Where(...).Delete(&user)
// DELETE FROM user Where ...
- 获取记录条数
counts, err := engine.Count(&user)
// SELECT count(*) AS total FROM user
- 条件编辑器
err := engine.Where(builder.NotIn("a", 1, 2).And(builder.In("b", "c", "d", "e"))).Find(&users)
// SELECT id, name ... FROM user WHERE a NOT IN (?, ?) AND b IN (?, ?, ?)
案例
讨论
请加入QQ群:280360085 进行讨论。
贡献
如果您也想为Xorm贡献您的力量,请查看 CONTRIBUTING
LICENSE
BSD License http://creativecommons.org/licenses/BSD/