How to use mongo in golang is described

preface

The mongo driver used by the author is mgo, which is used by more people and the documents are quite complete

Website address: http: / / labix org/mgo

Document address: https: / / godoc org/labix org/v2 / mgo

Source address: https: / / github com/go - mgo/mgo

1. mgo package installation

go get gopkg.in/mgo.v2

But it seems that you can't download it from ES38en.in, so I'll take a detour and download it from github first

go get github.com/go-mgo/mgo

After download good, create the folder below $GOPATH src/gopkg. in/mgo v2, then github. com/go - mgo/mgo content, copy to gopkg. in/mgo v2

2. Test code

// 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.Clone()

 // 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)
 }
}

One thing to note about GameReport is that all fields in GameReport should be capitalized, otherwise mongo would not be written

conclusion