golang操作mongodb的方法

package main
import (
    "fmt"
    "launchpad.net/mgo"
    "launchpad.net/mgo/bson"
)
type Mail struct {
    Id bson.ObjectId "_id"
    Name string
    Email string
}
func main() {
    // 连接数据库
    session,err := mgo.Dial("127.0.0.1")
    if err != nil {
        panic(err)
    }
    defer session.Close()
    // 获取数据库,获取集合
    c := session.DB("test").C("mail")
    // 存储数据
    m1 := Mail{bson.NewObjectId(),"user1","user1@dotcoo.com"}
    m2 := Mail{bson.NewObjectId(),"user2@dotcoo.com"}
    m3 := Mail{bson.NewObjectId(),"user3","user3@dotcoo.com"}
    m4 := Mail{bson.NewObjectId(),"user4@dotcoo.com"}
    err = c.Insert(&m1,&m2,&m3,&m4)
    if err != nil {
        panic(err)
    }
    // 读取数据
    ms := []Mail{}
    err = c.Find(&bson.M{"name":"user3"}).All(&ms)
    if err != nil {
        panic(err)
    }
    // 显示数据
    for i,m := range ms {
        fmt.Printf("%s,%d,%sn",m.Id.Hex(),i,m.Email)
    }
}