本文使用的是官方驱动，https://github.com/mongodb/mongo-go-driver
，目前是beta版。

1. 安装

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

会输出如下提示，属于正常情况，可以不用管

package github.com/mongodb/mongo-go-driver: no Go files in $GOPATH/src/github.com/mongodb/mongo-go-driver

官方驱动目前仍有问题，需要把github.com/mongodb/mongo-go-driver目录拷贝到go.mongodb.org/mongo-driver才能用。

2. 连接

package main

import (
    "context"
    "fmt"
    "log"
    "time"

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

type Trainer struct {
    Name string
    Age  int
    City string
}

func main() {
    ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
    client, err := mongo.Connect(ctx, &options.ClientOptions{Hosts: []string{"localhost:27017"}})

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

    // Check the connection
    err = client.Ping(context.TODO(), nil)

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

    fmt.Println("Connected to MongoDB!")

    collection := client.Database("test").Collection("trainers")
    _ = collection

    err = client.Disconnect(context.TODO())

    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("Connection to MongoDB closed.")
}

参考：
https://www.mongodb.com/blog/post/mongodb-go-driver-tutorial