mongodb官方的golang驱动基础使用教程分享

go get github.com/mongodb/mongo-go-driver/mongo

if client, err = mongo.Connect(getContext(), url); err != nil {
  checkErr(err)
 }

if err = client.Ping(getContext(), readpref.Primary()); err != nil {
  checkErr(err)
 }

collection = client.Database("testing_base").Collection("howie")

collection.Drop(getContext())

if insertOneRes, err = collection.InsertOne(getContext(), howieArray[0]); err != nil {
  checkErr(err)
 }
 fmt.Printf("InsertOne插入的消息ID:%v\n", insertOneRes.InsertedID)

if insertManyRes, err = collection.InsertMany(getContext(), howieArray); err != nil {
  checkErr(err)
 }
 fmt.Printf("InsertMany插入的消息ID:%v\n", insertManyRes.InsertedIDs)

if err = collection.FindOne(getContext(), bson.D{{"name", "howie_2"}, {"age", 11}}).Decode(&howie); err != nil {
  checkErr(err)
 }
 fmt.Printf("FindOne查询到的数据:%v\n", howie)

if err = collection.FindOneAndDelete(getContext(), bson.D{{"name", "howie_3"}}).Decode(&howie); err != nil {
  checkErr(err)
 }
 fmt.Printf("FindOneAndDelete查询到的数据:%v\n", howie)

if err = collection.FindOneAndUpdate(getContext(), bson.D{{"name", "howie_4"}}, bson.M{"$set": bson.M{"name": "这条数据我需要修改了"}}).Decode(&howie); err != nil {
  checkErr(err)
 }
 fmt.Printf("FindOneAndUpdate查询到的数据:%v\n", howie)

if err = collection.FindOneAndReplace(getContext(), bson.D{{"name", "howie_5"}}, bson.M{"hero": "这条数据我替换了"}).Decode(&howie); err != nil {
  checkErr(err)
 }
 fmt.Printf("FindOneAndReplace查询到的数据:%v\n", howie)

if cursor, err = collection.Find(getContext(), bson.M{"createtime": bson.M{"$gte": 2}}, options.Find().SetLimit(2), options.Find().SetSort(bson.M{"createtime": -1})); err != nil {
  checkErr(err)
 }
 if err = cursor.Err(); err != nil {
  checkErr(err)
 }
 defer cursor.Close(context.Background())
 for cursor.Next(context.Background()) {
  if err = cursor.Decode(&howie); err != nil {
   checkErr(err)
  }
  howieArrayEmpty = append(howieArrayEmpty, howie)
 }
 fmt.Printf("Find查询到的数据:%v\n", howieArrayEmpty)

if size, err = collection.Count(getContext(), nil); err != nil {
  checkErr(err)
 }
 fmt.Printf("Count里面有多少条数据:%d\n", size)

if size, err = collection.Count(getContext(), bson.M{"createtime": bson.M{"$gte": 3}}); err != nil {
  checkErr(err)
 }
 fmt.Printf("Count里面有多少条数据:%d\n", size)

if updateRes, err = collection.UpdateOne(getContext(), bson.M{"name": "howie_2"}, bson.M{"$set": bson.M{"name": "我要改了他的名字"}}); err != nil {
  checkErr(err)
 }
 fmt.Printf("UpdateOne的数据:%d\n", updateRes)

if updateRes, err = collection.UpdateMany(getContext(), bson.M{"createtime": bson.M{"$gte": 3}}, bson.M{"$set": bson.M{"name": "我要批量改了他的名字"}}); err != nil {
  checkErr(err)
 }
 fmt.Printf("UpdateMany的数据:%d\n", updateRes)

if delRes, err = collection.DeleteOne(getContext(), bson.M{"name": "howie_1"}); err != nil {
  checkErr(err)
 }
 fmt.Printf("DeleteOne删除了多少条数据:%d\n", delRes.DeletedCount)

if delRes, err = collection.DeleteMany(getContext(), bson.M{"createtime": bson.M{"$gte": 7}}); err != nil {
  checkErr(err)
 }
 fmt.Printf("DeleteMany删除了多少条数据:%d\n", delRes.DeletedCount)