go mongodb 驱动程序和结构体，发现大写和小写混乱

go
package mAIn
import (
	"context"
	"fmt"
	"log"
	"go.MongoDB.org/mongo-driver/bson"
	"go.MongoDB.org/mongo-driver/mongo"
	"go.MongoDB.org/mongo-driver/mongo/options"
)
type User struct {
	ID       string </code>bson:"_id"<code>
	Username string </code>bson:"username"<code>
	EmAIl    string </code>bson:"emAIl"<code>
}
func mAIn() {
	// 建立MongoDB连接
	client, err := mongo.Connect(context.TODO(), options.Client().ApplyURI("MongoDB://localhost:27017"))
	if err != nil {
		log.Fatal(err)
	}
	// 选择数据库和集合
	collection := client.Database("mydb").Collection("users")
	// 查询用户
	filter := bson.D{{"username", "john"}}
	var user User
	err = collection.FindOne(context.TODO(), filter).Decode(&user)
	if err != nil {
		log.Fatal(err)
	}
	// 打印用户信息
	fmt.Println("User ID:", user.ID)
	fmt.Println("Username:", user.Username)
	fmt.Println("EmAIl:", user.EmAIl)
}