mgo简介以及使用说明

简介：
mgo是Go语言操作monggodb数据库的一个驱动，封装了基于Go语法的API
官网地址：http://labix.org/mgo
文档地址：

mgo GoDoc GoWalker
mgo/bson GoDoc GoWalker
mgo/txn GoDoc GoWalker
准备工作：
golang、mongodb安装
git bash安装（用于获取版本库）
示例代码：package main

import (
"fmt"
"log"

"time"

"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
)

type User struct {
Id_ bson.ObjectId `bson:"_id"`
Name string `bson:"name"`
Age int `bson:"age"`
JonedAt time.Time `bson:"joned_at"`
Interests []string `bson:"interests"`
}

func main() {
fmt.Println("This is a test to use mgo for go.")

//connect server
session, err := mgo.Dial("")
if err != nil {
panic(err)
} else {
fmt.Println("connect success.")
}
defer session.Close()

//connect db
session.SetMode(mgo.Monotonic, true)
db := session.DB("hykj001")

//switch collection
c := db.C("people")

//insert
err = c.Insert(&User{
Id_: bson.NewObjectId(),
Name: "Jimmy Kuu",
Age: 33,
JonedAt: time.Now(),
Interests: []string{"Develop", "Movie"},
})
if err != nil {
log.Fatal(err)
} else {
fmt.Println("insert success.")
}

//select no condition
var users []User
c.Find(nil).All(&users)
fmt.Println(users)

//select one condition
c.Find(bson.M{"name": "Jimmy Kuu"}).All(&users)//name not Name
fmt.Println(users)

//update alter
c.Update(bson.M{"_id": bson.ObjectIdHex("5a911d109c44bc1a30c9472d")},
bson.M{"$set": bson.M{
"name": "Jimmy Gu",
"age": 34,
}})
id := "5a911f559c44bc07a4fc612a"
objectId := bson.ObjectIdHex(id)
user := new(User)
c.Find(bson.M{"_id": objectId}).One(&user)
fmt.Println(user)

//update add
c.Update(bson.M{"_id": bson.ObjectIdHex("5a911f559c44bc07a4fc612a")},
bson.M{"$inc": bson.M{
"age": -1,
}})
objectId = bson.ObjectIdHex(id)
c.FindId(objectId).One(&user)
fmt.Println(user)

//add ele
c.Update(bson.M{"_id": bson.ObjectIdHex("5a911f559c44bc07a4fc612a")},
bson.M{"$push": bson.M{
"interests": "Golang",
}})
objectId = bson.ObjectIdHex(id)
c.FindId(objectId).One(&user)
fmt.Println(user)

//del ele
c.Update(bson.M{"_id": bson.ObjectIdHex("5a911f559c44bc07a4fc612a")},
bson.M{"$pull": bson.M{
"interests": "Golang",
}})
objectId = bson.ObjectIdHex(id)
c.FindId(objectId).One(&user)
fmt.Println(user)

//remove
c.Remove(bson.M{"name": "Jimmy Kuu"})
c.Find(nil).All(&users)
fmt.Println(users)
}