* * b2db是一个dao层的框架，现在网络上有好多golang Dao的框架，比如beegoo.rm、beedb;在使用过程中感觉beegoo.rm太大了，而beedb不支持事物以及一对一，多对多查询。刚开始的的时候无聊更改了beedb的代码，增接了事物这个功能，后来有时间了就重新写了b2db。下面来说b2db的使用吧：
* * 首先贴上下载地址
* * 或者：go get https://github.com/JeonYang/b2db.git
- 这个以前有总结可以看一下
- b2DB = b2db.New(db)
* * 按照对象添加
var student Student
//student.SId=42
student.Name = time.Now().String()[0:10]
student.PassWord = "Test Add Departname"
student.ClassId = "1"
err:=orm.Save(&student)
* * 按照map添加
add := make(map[string]interface{})
add["name"] = "cloud develop"
add["password"] = "2012-12-02"
add["classId"] = "2"
in,err:=orm.SetTable("student").Insert(add)
* * 多个添加
rows := make([]map[string]interface{}, 5)
for i := 0; i < 5; i++ {
add := make(map[string]interface{})
name := "person" + strconv.Itoa(i)
add["username"] = name
add["departname"] = "IT"
add["created"] = time.Now().String()[0:10]
rows[i] = add
}
in,err:=orm.SetTable("userinfo").InsertBatch(rows)
* * 删除单个对象
saveone := selectone(orm)
log.Println(saveone)
in,err:=orm.Delete(&saveone)
* * 按照一定条件删除
orm.SetTable("userinfo").Where("uid=?", 30).DeleteRow()
* * 同时删除多个对象
var allStudent []Student
in,err:=orm.DeleteAll(&allStudent)
* * 按照对象修改
var student Student
//student.SId=42
student.Name = time.Now().String()[0:10]
student.PassWord = "Test Add Departname"
student.ClassId = "1"
err:=orm.Save(&student)
* * 按照一定条件删除
t := make(map[string]interface{})
t["username"] = "yangp"
in,_:=orm.SetTable("userinfo").SetPK("uid").Where(2).Update(t)
* * 按照对象查找
var student Student
student.SId=55
err:=orm.FindOne(&student)
* * 一次查找多个
var allStudent []Student
orm.Limit(2).Where("Id>30", ).FindAll(&allStudent)
* * 按照一定条件查找
SetTable("student").
SetPK("Id").
Where("Id > ?", "10").
Select("student.Id as SId, student.name, student.password, student.classId").
FindMap()
* * 一对一查找
var student Student
student.SId=36
orm.FindOneToOne(&student)
* * 一对多查找
var class Class
class.Id=1
orm.FindOneToMore(&class)
* * 多对多查找
var class []Class
orm.Where("class.Id>0").FindMoreToMore(&class)
* * GroupBy查找
b, _ := orm.SetTable("student").GroupBy("name").Having("name='123'").FindMap()
* * Join查找
a, _ := orm.SetTable("userinfo").Join("LEFT", "userdeatail", "userinfo.uid=userdeatail.uid").Where("userinfo.uid=?", 10).Select("userinfo.uid,userinfo.username,userdeatail.profile").FindMap()
* * 开启事物
orm.Begin()
* * 提交事物
orm.Commit()
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