唤醒手腕 Go 语言基于mongo库进行连接Mongodb数据库(更新中)

官方文档mongo说明

Package mongo provides a MongoDB Driver API for Go.

Basic usage of the driver starts with creating a Client from a connection string. To do so, call Connect:

ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
defer cancel()
client, err := mongo.Connect(ctx, options.Client().ApplyURI("mongodb://foo:bar@localhost:27017"))
if err != nil {
    
     return err }

This will create a new client and start monitoring the MongoDB server on localhost. The Database and Collection types can be used to access the database:

collection := client.Database("baz").Collection("qux")

A Collection can be used to query the database or insert documents:

res, err := collection.InsertOne(context.Background(), bson.M{
    
    "hello": "world"})
if err != nil {
    
     return err }
id := res.InsertedID

下载 mongo-driver 驱动

驱动包获取

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

Go 语言连接 MongoDB

首先介绍下 Context

这个时候就轮到Context登场了。Context顾名思义是协程的上下文,主要用于跟踪协程的状态,可以做一些简单的协程控制,也能记录一些协程信息。

连接 mongodb 数据库

package main

import (
	"context"
	"fmt"
	"log"

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

var client *mongo.Client

func initDB() {
    
    
	clientOptions := options.Client().ApplyURI("mongodb://localhost:27017")

	var err error
	c, err := mongo.Connect(context.TODO(), clientOptions)
	if err != nil {
    
    
		log.Fatal(err)
	}

	err = c.Ping(context.TODO(), nil)
	if err != nil {
    
    
		log.Fatal(err)
	}
	fmt.Println("MongoDB 连接成功")
	client = c
}

func main() {
    
    
	initDB()
}

mongo 插入文档操作

官方案例

This will create a new client and start monitoring the MongoDB server on localhost. The Database and Collection types can be used to access the database:

collection := client.Database("gobase").Collection("student")

A Collection can be used to query the database or insert documents:


res, err := collection.InsertOne(context.Background(), bson.M{
    
    "hello": "world"})
if err != nil {
    
    
	log.Fatal(err)
}
id := res.InsertedID
fmt.Print(id)

结构体插入数据库

首先, 创建一些Trainer结构体用来插入到数据库:

ash := Trainer{
    
    "Ash", 10, "Pallet Town"}
misty := Trainer{
    
    "Misty", 10, "Cerulean City"}
brock := Trainer{
    
    "Brock", 15, "Pewter City"}

插入一个单独的文档, 使用 collection.InsertOne()函数:

insertResult, err := collection.InsertOne(context.TODO(), ash)
if err != nil {
    
    
    log.Fatal(err)
}
 
fmt.Println("Inserted a single document: ", insertResult.InsertedID)

同时插入多个文档, collection.InsertMany() 函数会采用一个slice对象:

trainers := []interface{
    
    }{
    
    misty, brock}
 
insertManyResult, err := collection.InsertMany(context.TODO(), trainers)
if err != nil {
    
    
    log.Fatal(err)
}
 
fmt.Println("Inserted multiple documents: ", insertManyResult.InsertedIDs)

mongo 查找文档操作

查询一个文档, 你需要一个filter文档, 以及一个指针在它里边保存结果的解码。要查询单个的文档, 使用collection.FindOne()函数。这个函数返回单个的结果,被解码成为一个值。

可以使用和上面使用过的update查询一样的filter变量来匹配一个name是Ash的文档。

create a value into which the result can be decoded


var result Trainer
err = collection.FindOne(context.TODO(), filter).Decode(&result)
if err != nil {
    
    
    log.Fatal(err)
}
 
fmt.Printf("Found a single document: %+v\n", result)

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转载自blog.csdn.net/qq_47452807/article/details/128667435
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