golang操作mongodb

這是一個建立於 的文章，其中的資訊可能已經有所發展或是發生改變。所需包engine

import (

    "fmt"

    "sync"

    "engine/mgo"

    "engine/mgo/bson"

)

var (

    session *mgo.Session

    db      *mgo.Database

    c       *mgo.Collection

    mux     sync.Mutex

)

func init() {

    mux.Lock()

    defer mux.Unlock()

    if session != nil {

        return

    }

    // new session

    session, err := mgo.Dial("192.168.0.229:27017")

    checkErr("dial fail", err)

    session.SetMode(mgo.Monotonic, true)

    // new db

    if db != nil {

        return

    }

    db = session.DB("Test")

    // new collection

    if c != nil {

        return

    }

    c = db.C("person")

}

func checkErr(data string, err error) {

    if err != nil {

        fmt.Println(data + ": " + err.Error())

    }

}

type Person struct {

    Name  string

    Email string

}

func New() *Person {

    return &Person{

        Name:  "zhangbaolang",

        Email: "zhagnbaoliang.vip@gmail.com",

    }

}

func main() {

    // insert

    err := c.Insert(New())

    checkErr("insert fail", err)

    // find

    m := bson.M{"name": "zhangbaolang"}

    query := c.Find(m)

    // one

    person := Person{}

    err = query.One(&person)

    //fmt.Println(person.Name)

    checkErr("query fail", err)

    fmt.Println(person.Email)

    if session != nil {

        session.Close()

    }

}