Golang对MongoDB数据库的操作简单封装教程

var globalS *mgo.Session

func init() {
 s, err := mgo.Dial(dialInfo)
 if err != nil {
 log.Fatalf("Create Session: %s\n", err)
 }
 globalS = s
}

func init() {
 dialInfo := &mgo.DialInfo{
 Addrs: []string{dbhost}, //数据库地址 dbhost: mongodb://user@123456:127.0.0.1:27017
 Timeout: timeout,  // 连接超时时间 timeout: 60 * time.Second
 Source: authdb,  // 设置权限的数据库 authdb: admin
 Username: authuser,  // 设置的用户名 authuser: user
 Password: authpass, // 设置的密码 authpass: 123456
 PoolLimit: poollimit, // 连接池的数量 poollimit: 100
 }

 s, err := mgo.DialWithInfo(dialInfo)
 if err != nil {
 log.Fatalf("Create Session: %s\n", err)
 }
 globalS = s
}

func connect(db, collection string) (*mgo.Session, *mgo.Collection) {
 ms := globalS.Copy()
 c := ms.DB(db).C(collection)
 ms.SetMode(mgo.Monotonic, true)
 return ms, c
}

func Insert(db, collection string, doc interface{}) error {
 ms, c := connect(db, collection)
 defer ms.Close()

 return c.Insert(doc)
}

// test
data := &Data{
 Id: bson.NewObjectId().Hex(),
 Title: "标题",
 Des: "博客描述信息",
 Content: "博客的内容信息",
 Img: "https://upload-images.jianshu.io/upload_images/8679037-67456031925afca6.png",
 Date: time.Now(),
}

err := db.Insert("Test", "TestModel", data)

func FindOne(db, collection string, query, selector, result interface{}) error {
 ms, c := connect(db, collection)
 defer ms.Close()

 return c.Find(query).Select(selector).One(result)
}

func FindAll(db, collection string, query, selector, result interface{}) error {
 ms, c := connect(db, collection)
 defer ms.Close()

 return c.Find(query).Select(selector).All(result)
}

//test 查询title="标题",并且返回结果中去除`_id`字段
var result Data
err = db.FindOne(database, collection, bson.M{"title": "标题"}, bson.M{"_id":0}, &result)

func Update(db, collection string, selector, update interface{}) error {
 ms, c := connect(db, collection)
 defer ms.Close()

 return c.Update(selector, update)
}

//更新，如果不存在就插入一个新的数据 `upsert:true`
func Upsert(db, collection string, selector, update interface{}) error {
 ms, c := connect(db, collection)
 defer ms.Close()

 _, err := c.Upsert(selector, update)
 return err
}

// `multi:true`
func UpdateAll(db, collection string, selector, update interface{}) error {
 ms, c := connect(db, collection)
 defer ms.Close()

 _, err := c.UpdateAll(selector, update)
 return err
}

//test
err = db.Update(database, collection, bson.M{"_id": "5b3c30639d5e3e24b8786540"}, bson.M{"$set": bson.M{"title": "更新标题"}})

func Remove(db, collection string, selector interface{}) error {
 ms, c := connect(db, collection)
 defer ms.Close()

 return c.Remove(selector)
}

func RemoveAll(db, collection string, selector interface{}) error {
 ms, c := connect(db, collection)
 defer ms.Close()

 _, err := c.RemoveAll(selector)
 return err
}

//test
err = db.Remove(database,collection,bson.M{"_id":"5b3c30639d5e3e24b8786540"})

func FindPage(db, collection string, page, limit int, query, selector, result interface{}) error {
 ms, c := connect(db, collection)
 defer ms.Close()

 return c.Find(query).Select(selector).Skip(page * limit).Limit(limit).All(result)
}

func IsEmpty(db, collection string) bool {
 ms, c := connect(db, collection)
 defer ms.Close()
 count, err := c.Count()
 if err != nil {
 log.Fatal(err)
 }
 return count == 0
}

func Count(db, collection string, query interface{}) (int, error) {
 ms, c := connect(db, collection)
 defer ms.Close()
 return c.Find(query).Count()
}