golang mongodb 查询

go get go.mongodb.org/mongo-driver

package main

import (
    "context"
    "fmt"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
    "log"
)

func main() {

    // 设置客户端连接配置
    clientOptions := options.Client().ApplyURI("mongodb://localhost:27017")

    // 连接到MongoDB
    client, err := mongo.Connect(context.Background(), clientOptions)

    if err != nil {
        log.Fatal(err)
    }

    // 检查连接状态
    err = client.Ping(context.Background(), nil)

    if err != nil {
        log.Fatal(err)
    }

    fmt.Println("连接MongoDB成功")

}

package main

import (
    "fmt"
    "go.mongodb.org/mongo-driver/bson"
)

func main() {
    filter := bson.M{"username": "testuser"}
    fmt.Println(filter)
}

package main

import (
    "context"
    "fmt"
    "go.mongodb.org/mongo-driver/bson"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
    "log"
)

type User struct {
    Username string `bson:"username"`
    PassWord string `bson:"password"`
}

func main() {

    // 设置客户端连接配置
    clientOptions := options.Client().ApplyURI("mongodb://localhost:27017")

    // 连接到MongoDB
    client, err := mongo.Connect(context.Background(), clientOptions)

    if err != nil {
        log.Fatal(err)
    }

    // 检查连接状态
    err = client.Ping(context.Background(), nil)

    if err != nil {
        log.Fatal(err)
    }

    fmt.Println("连接MongoDB成功")

    // 获取集合
    collection := client.Database("test").Collection("users")

    // 构建查询条件文档
    filter := bson.M{"username": "testuser"}

    // 执行查询
    var user User
    err = collection.FindOne(context.Background(), filter).Decode(&user)

    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("用户名：%s， 密码：%s", user.Username, user.Password)

}