如何在 mongo-go-driver 中添加选项 `writeConcern`？

Question

我不明白如何使用mongo-go-driver为 MongoDB 添加记录参数示例请求c.client.Database(MONGO_DATABASE).Collection(*packet.ID).InsertMany(nil, packet.Item, opt)如何指定必要的参数opt？

Answer 1

版本 1.0

在 MongoDB Go 驱动程序生产版本中，您可以设置writeConcern如下：

import (    

    "go.mongodb.org/mongo-driver/mongo/options"     

    "go.mongodb.org/mongo-driver/bson"  

    "go.mongodb.org/mongo-driver/mongo"     

    "go.mongodb.org/mongo-driver/mongo/writeconcern" 

)

mongoURI := "mongodb://server:port/"

opts := options.Client().ApplyURI(mongoURI).SetWriteConcern(writeconcern.New(writeconcern.WMajority()))

client, err := mongo.NewClient(opts)

if err != nil {

    panic(err)

}

ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)

defer cancel()

err = client.Connect(ctx)

if err != nil {

    panic(err)

}

collection := client.Database("database").Collection("collection")

也可以看看：

• mongo 驱动程序/mongo/选项

• mongo 驱动程序/mongo/writeconcern

版本 0.0.16

使用mongo-go-driver，您可以设置写关注选项，如下例所示：

import(

  "github.com/mongodb/mongo-go-driver/bson"

  "github.com/mongodb/mongo-go-driver/core/writeconcern"

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

  "github.com/mongodb/mongo-go-driver/mongo/collectionopt"

)

// Example document 

document := bson.VC.DocumentFromElements(

                 bson.EC.SubDocumentFromElements(

                   "foo",

                   bson.EC.Int32("bar", 101),

                 ),

               )

// Set majority write concern

wMajority := writeconcern.New(writeconcern.WMajority())

database := client.Database("database")

collection := database.Collection("collection", collectionopt.WriteConcern(wMajority))

_, err = collection.InsertOne(context.Background(), document)

也可以用来W(int)指定任意数量的mongod实例。