Analyse de code d'un simple cas de discussion de groupe QQ (implémentation PHP)

<?php
//数据库连接类
class Mysql{
    //属性：id,姓名，账号，密码，登录时间
    public $link = "";//id
   
    public function __construct(){
        //创建连接
        $this->init();
    }
    public function __destruct(){
        //销毁数据库连接
        if( $this->link ){
            mysqli_close($this->link);
        }
    }
    //创建连接，初始化连接
    public function init(  ){
       //创建连接
       $config = Array(
           "type"=>&#39;mysql&#39;,
           "hostname"=>"127.0.0.1",
           "database"=>"qq",
           "username"=>"root",
           "password"=>"root"
       );
       $this->link = mysqli_connect($config[&#39;hostname&#39;],$config[&#39;username&#39;],
        $config[&#39;password&#39;],$config[&#39;database&#39;]);
       
    }
}
?>

<?php
require_once "MySql.class.php";
class Group{
    // 属性：id,创建会员,群名称，群的创建时间
    public $id = "";
    public $userid = "";
    public $groupName = "";
    public $createTime = "";
    public $mySql = "";
    public $tableName = "qq_user_group";
    public function __construct(){
        $this->mySql = new MySql();
    }
    //1.获取所有的群 
    //如果不指定具体的创建人，可以获取所有的群
    public function getAll($creatorUserId=&#39;&#39;){
        //创建连接
        $conn = $this->Mysql->link;
        //写sql,执行sql
        $where = "";
        if( !empty($userid) ){
            $where .= " creator_user_id=".$creatorUserId;
        }
        $sql = "select * from {$this->tableName} where 1=1 and {$where}";
        //执行sql
        $result = mysqli_query($conn,$sql);

        //获取数据
        // $list = mysqli_fetch_all($result);
        $list = Array();
        while( $row=mysqli_fetch_assoc($result) ){
            $list[] = $row;
        }
        //end
        //返回数据
        return $list;
    }
    //2.创建群 留给同学些，课上就不写了，因为目前的最终效果不需要呈现，默认已经是张三创建好了
    public function create(){
        echo "创建了群";
    }
    
}
?>

<?php
require_once  dirname(__FILE__)."/MySql.class.php";

// 会员消息类
class Message{
    //属性：id,内容，发送时间，发送人，接收人，状态(已读,未读),查看时间
    public $id = "";
    public $content = "";
    public $sendTime = "";
    public $sendUserId = "";
    public $toUserId = "";
    public $status = "";
    public $readTime = "";
    public $mySql = "";
    public $tableName = "qq_msg";
    public function __construct(){
        $this->mySql = new MySql();
    }
    

    // 方法：修改状态（可以被修改为已读），查看消息，发送消息
    public function updateStatus($id,$status){
        //创建连接
        $conn = $this->mySql->link;
        //写sql，执行sql
        $sql = "update {$this->tableName} set status={$status} where id={$id}";
        //执行
        $result = mysqli_query($conn,$sql);
        if( $result ){
            return true;
        }else{
            return false;
        }

    }
    //查看会员消息列表
    public function getMsgList($userid,$type,$startTime,$endTime,$groupId){
        //创建连接
        $conn = $this->mySql->link;
        //写sql，执行sql
        $where = " to_user_id={$userid} ";
        if( $type !=""){//这里特别注意不能直接写!empty，会导致0的情况考虑不进来 而0表示未读
            $where .= " and status=".$type;
        }
        if( !empty($startTime) && !empty($endTime) ){
            //判断时间
            $where .= " and create_time between {$startTime} and  {$endTime}";
        }
        if( $groupId ){
            $where .= " and group_id = ".$groupId;
        }
        $sql = "select * from {$this->tableName} where {$where}";
        
        //执行

        $result = mysqli_query($conn,$sql);
        //获取数据
        // return mysqli_fetch_all($result);
        $list = Array();
        while( $row=mysqli_fetch_assoc($result) ){
            $list[] = $row;
        }
        return $list;
    }
    //添加消息
    public function add($userid,$content,$toUserId,$groupId){
        
        //创建连接
        $conn = $this->mySql->link;
        //写sql，执行sql
        $sql = "insert into {$this->tableName} (content,create_time,send_user_id,
            to_user_id,status,read_time,group_id) values (&#39;{$content}&#39;,".time().",{$userid},
                {$toUserId},0,0,".$groupId.") ";
        //执行
        $result = mysqli_query($conn,$sql);
        if( $result ){
            return true;
        }else{
            return false;
        }
        
        
    }

}
?>

<?php
//引入UserLoginInfo
require_once  "MySql.class.php";
require_once "UserLoginInfo.class.php";
require_once "Message.class.php";
class User{
    //属性：id,姓名，账号，密码，登录时间
    public $id = "";//id
    public $name = "";//姓名
    public $username = "";//账号
    public $password = "";//密码
    public $mySql = "";
    public $tableName = "qq_msg";
   
    public function __construct($id,$name,$username,$password){
        //初始化对象
        $this->id = $id;
        $this->name = $name;
        $this->username = $username;
        $this->password = $password;
        $this->mySql = new MySql();
    }
   

    public function login( $inputUsername,$inputPassword ){
        //登录逻辑
        //判断用户名和密码是否正确
        if( $inputUsername != $this->username ||
            $inputPassword !=$this->password){
            return array("msg"=>"用户名或者账号错误");
        }
        //登录成功
        $logintime = time();
        // echo $this->name."使用账号：{$inputUsername}和密码{$inputPassword}登录了，
        //     登录时间为:".date(&#39;Y-m-d H:i:s&#39;,$logintime);
        //将登录信息保存到数据库
        $logininfo = new UserLoginInfo();
        $result = $logininfo->save($this->id);
        return $result;
    }
    //查看消息 
    public function getMessage($startTime,$endTime,$groupId){
        //查看消息相当于通过查看这个动作和消息进行了互动
        //所以通过方法的调用来执行
        $messageModel = new Message();
        return $messageModel->getMsgList($this->id,&#39;&#39;,$startTime,$endTime,$groupId);
        
    }
    //发送消息相当于通过查看这个动作和消息进行了互动
    public function sendMessage($content,$toUserId,$groupId){
         //所以通过方法的调用来执行
        $messageModel = new Message();
        return $messageModel->add($this->id,$content,$toUserId,$groupId);
    }
    
}
?>

<?php
require_once "Mysql.class.php";
class UserGroupRelation{
    // 属性：id,创建会员,群名称，群的创建时间
    public $id = "";
    public $userid = "";
    public $groupName = "";
    public $createTime = "";
    public $mySql = "";
    public $tableName = "qq_user_group_relation";
    public function __construct(){
        $this->mySql = new MySql();
    }
    
    //1.获取一个群里所有的会员 根据群获取会员
    public function getUserList($groupid){
        //创建连接
        $conn = $this->mySql->link;
        //写sql，执行sql
       
        $sql = "select * from {$this->tableName }  where group_id={$groupid}";
        //执行
        $result = mysqli_query($conn,$sql);
        //获取数据
        // return mysqli_fetch_all($result);
        $list = Array();
        while( $row=mysqli_fetch_assoc($result) ){
            $list[] = $row;
        }
        return $list;
    }
    //2.根据某个会员获取他所有的群
    public function getGroupList($userid){
        //创建连接
        $conn = $this->mySql->link;
        //写sql，执行sql
       
        $sql = "select * from {$this->tableName }  where user_id={$userid}";
        //执行
        $result = mysqli_query($conn,$sql);
        //获取数据
        // return mysqli_fetch_all($result);
        $list = Array();
        while( $row=mysqli_fetch_assoc($result) ){
            $list[] = $row;
        }
        return $list;
    }
    
}
?>

<?php
require_once "Mysql.class.php";

class UserLoginInfo{
    //属性：id,会员id,登录时间
    public $id = "";//id
    public $userid = "";//姓名
    public $loginTime = "";//登录时间
    public $mySql = "";
    public $tableName = "qq_user_login_record";
    public function __construct(){
        $this->mySql = new MySql();
    }
    //方法：
    public function save( $userid ){
        //添加用户登录记录
        $logintime = time();
        //保存到数据库
        //创建连接
        $conn = $this->mySql->link;
        //写sql执行sql
        $sql = "insert into ".$this->tableName.
            "(user_id,login_time) values({$userid}, {$logintime} )";
      
        //执行
        $result = mysqli_query($conn,$sql);
        //这种增，删，改的动作返回的结果是一个数字 1表示成功
        if( $result ){
            return true;
        }else{
            return false;
        }
        
    }
    //获取用户最后登录信息
    public function getLastLoginInfo($userid){
        //创建连接
        $conn = $this->mySql->link;
        //写sql执行sql
        $sql = "select * from ".$this->tableName.
            " where user_id={$userid} order by id desc limit 2";
   
        //执行
        $result = mysqli_query($conn,$sql);
        //获取数据
        $lastLoginInfo = mysqli_fetch_assoc($result);
        
        return $lastLoginInfo;
    }
}
?>

<?php
//业务代码
require_once "model/Message.class.php";
require_once "model/User.class.php";
require_once "model/UserGroupRelation.class.php";
require_once "model/UserLoginInfo.class.php";

//张三登录
$zhangsan = new User(1,"张三","a","b");
// //登录
$zhangsan->login("a","b");
echo $zhangsan->name."使用账号a和密码b 登录了<br/><br/>";
//输出最后登录时间
$logininfoModel = new UserLoginInfo();
//获取最后登录信息
$lastLoginInfo = $logininfoModel->getLastLoginInfo($zhangsan->id);
$lastLoginTime = date("Y-m-d H:i:s",$lastLoginInfo[&#39;login_time&#39;]);

echo $zhangsan->name."最后登录时间为".$lastLoginTime."<br/><br/>";
// 2.张三查看了 1个小时内的行政部门群的信息（这个群里有张三，李四，王五，其中张三是群主）
$startTime= strtotime("-1 hour");
$endTime = time();
$msglist = $zhangsan->getMessage($startTime,$endTime,1);//查看行为
echo "张三查看了 1小时内的行政部门群的信息<br/><br/>";
echo "<b>张三看到的信息是</b></br/><br/>";
//3.输出张三看到的这些信息
// print_r($msglist);
foreach( $msglist as $msg ){
       echo "【发送人id】:".$msg["send_user_id"]."【内容】：".$msg["content"]."<br/>";
}
echo "<br/><br/>";
//4.突然张三收到好友李四的信息：信息叫：张三，你在干嘛
//相当于是李四给张三发送了消息
$lisi = new User(2,"李四","lisi","123456");
$lisi->sendMessage("张三,我是李四，你在干嘛",$zhangsan->id,2);
echo "李四发了信息给张三，说“张三,我是李四，你在干嘛”<br/><br/>";
//5.张三回复李四：我在想你呀
$zhangsan->sendMessage("我在想你呀",$lisi->id,2);
echo "张三回复了李四，说“我在想你呀”";
?>