golang中使用mongo

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笔者使用的mongo驱动是mgo, 这个使用的人比较多，文档也比较齐全

• 官网地址：http://labix.org/mgo
• 文档地址：https://godoc.org/labix.org/v2/mgo
• 源码地址：https://github.com/go-mgo/mgo

1. mgo包安装

go get gopkg.in/mgo.v2

但是貌似现在从gopkg.in下载不了，迂回一下，先从github上下载

go get github.com/go-mgo/mgo

下载好了之后，在$GOPATH/src/下面创建文件夹gopkg.in/mgo.v2, 然后将github.com/go-mgo/mgo的内容，拷贝到gopkg.in/mgo.v2

2. 测试代码

mongo url 格式
[mongodb://][user:pass@]host1[:port1][,host2[:port2],...][/database][?options]
for example
mongodb://myuser:mypass@localhost:40001,otherhost:40001/mydb

// mongo_test project main.go
package main

import (
    "fmt"
    "math/rand"
    "time"

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

type GameReport struct {
    // id          bson.ObjectId `bson:"_id"`
    Game_id     int64
    Game_length int64
    Game_map_id string
}

func err_handler(err error) {
    fmt.Printf("err_handler, error:%s\n", err.Error())
    panic(err.Error())
}

func main() {
    dail_info := &mgo.DialInfo{
        Addrs:     []string{"127.0.0.1"},
        Direct:    false,
        Timeout:   time.Second * 1,
        Database:  "game_report",
        Source:    "admin",
        Username:  "test1",
        Password:  "123456",
        PoolLimit: 1024,
    }

    session, err := mgo.DialWithInfo(dail_info)
    if err != nil {
        fmt.Printf("mgo dail error[%s]\n", err.Error())
        err_handler(err)
    }

    defer session.Close()

    // set mode
    session.SetMode(mgo.Monotonic, true)

    c := session.DB("game_report").C("game_detail_report")

    r := rand.New(rand.NewSource(time.Now().UnixNano()))

    report := GameReport{
        // id:          bson.NewObjectId(),
        Game_id:     100,
        Game_length: r.Int63() % 3600,
        Game_map_id: "hello",
    }

    err = c.Insert(report)

    if err != nil {
        fmt.Printf("try insert record error[%s]\n", err.Error())
        err_handler(err)
    }

    result := GameReport{}
    var to_find_game_id int64 = 100
    err = c.Find(bson.M{"game_id": to_find_game_id}).One(&result)
    if err != nil {
        fmt.Printf("try find record error[%s]\n", err.Error())
        err_handler(err)
    }

    fmt.Printf("res, game_id[%d] length[%d] game_map_id[%s]\n",
        to_find_game_id, result.Game_length, result.Game_map_id)

    // try find all report
    var results []GameReport
    err = c.Find(bson.M{}).All(&results)
    if err != nil {
        fmt.Printf("try game all record of game_detail_report error[%s]\n",
            err.Error())
        err_handler(err)
    }

    result_count := len(results)
    fmt.Printf("result count: %d\n", result_count)
    for i, report := range results {
        fmt.Printf("index: %d, report{ game_id: %d, game_length: %d, game_map_id: %s}\n",
            i, report.Game_id, report.Game_length, report.Game_map_id)
    }
}

这里要注意的一点是 GameReport 里面的字段都要首字母大写，否则不会写入mongo