swoole4-swoole创建Mysql连接池

<?php
/

• Created by PhpStorm.
• User: Administrator
• Date: 2018/11/20
• Time: 14:12
  /
  //编写mysql连接池，这个类只能被实例化一次（单例）
  class MysqlConnectionPool
  {
  private static $instance;//单例对象
  private $connection_num = 10;//连接数量
  private KaTeX parse error: Expected group after '_' at position 67: …ivate function _̲_construct() {…i=0; i < i< i<this->connection_num;$i++){
  $dsn = “mysql:host=127.0.0.1;dbnane=swoole”;
  t h i s − > c o n n e c t i o n o b j [ ] = n e w P d o ( this->connection_obj[] = new Pdo( this−>connectiono​bj[]=newPdo(dsn,‘root’,‘rootmysql123’);
  }
  }
  private function __clone()
  {
  // TODO: Implement __clone() method.
  }
  public static function getInstance()
  {
  if(is_null(self::KaTeX parse error: Expected '}', got 'EOF' at end of input: … self::instance = new self();
  }
  }
  }
  MysqlConnectionPool::getInstance();
  //创建swool的http服务器对象
  $serv = new swoole_http_server(‘0.0.0.0’,8000);
  //当浏览器链接点这个http服务器的时候,向浏览器发送helloworld
  s e r v − > o n ( ′ r e q u e s t ′ , f u n c t i o n ( serv->on('request', function( serv−>on(′request′,function(request,KaTeX parse error: Expected '}', got 'EOF' at end of input: response){ //request包含这个请求的所有信息，比如参数
  //$response包含返回给浏览器的所有信息，比如helloworld
  //(2.3)向浏览器发送helloworld
  $response->end(“hello world”);
  });
  //启动http服务器
  $serv->start();*

效果图
**（4）完善mysql连接池
<?php
/

• Created by PhpStorm.
• User: Administrator
• Date: 2018/11/20
• Time: 14:12
  /
  //编写mysql连接池，这个类只能被实例化一次（单例）
  class MysqlConnectionPool
  {
  private static $instance;//单例对象
  private $connection_num = 20;//连接数量
  private $connection_obj = [];
  private KaTeX parse error: Expected group after '_' at position 78: …ivate function _̲_construct() {…i=0; i < i< i<this->connection_num;$i++){
  $dsn = “mysql:host=127.0.0.1;dbname=swoole”;
  t h i s − > c o n n e c t i o n o b j [ ] = n e w P d o ( this->connection_obj[] = new Pdo( this−>connectiono​bj[]=newPdo(dsn,‘root’,‘rootmysql123’);
  }
  }
  private function __clone()
  {
  // TODO: Implement __clone() method.
  }
  public static function getInstance()
  {
  if(is_null(self::KaTeX parse error: Expected '}', got 'EOF' at end of input: … self::instance = new self();
  }
  return self::KaTeX parse error: Expected 'EOF', got '}' at position 12: instance; }̲ //执行sql操作 pu…sql)
  {
  if($this->avil_connection_num==0){
  throw new Exception(“暂时没有可用的连接诶，请稍后”);
  }
  //执行sql语句
  p d o = a r r a y p o p ( pdo = array_pop( pdo=arrayp​op(this->connection_obj);
  //可用连接数减1
  $this->avil_connection_num --;
  //使用从连接池中取出的mysql连接执行查询，并且把数据取成关联数组
  $rows = p d o − > q u e r y ( pdo->query( pdo−>query(sql)->fetchAll(PDO::FETCH_ASSOC);
  //把mysql连接放回连接池，可用连接数+1
  array_push( t h i s − > c o n n e c t i o n o b j , this->connection_obj, this−>connectiono​bj,pdo);
  $this->avil_connection_num ++;
  return $rows;
  }
  }
  //创建swool的http服务器对象
  $serv = new swoole_http_server(‘0.0.0.0’,8000);
  //当浏览器链接点这个http服务器的时候,向浏览器发送helloworld
  s e r v − > o n ( ′ r e q u e s t ′ , f u n c t i o n ( serv->on('request', function( serv−>on(′request′,function(request,KaTeX parse error: Expected '}', got 'EOF' at end of input: response){ //request包含这个请求的所有信息，比如参数
  //$response包含返回给浏览器的所有信息，比如helloworld
  //向浏览器发送helloworld
  s t o p = f a l s e ; w h i l e ( ! stop = false; while (! stop=false;while(!stop){
  try{
  $sql = “SELECT * FROM user ORDER BY id DESC LIMIT 5”;
  r o w s = M y s q l C o n n e c t i o n P o o l : : g e t I n s t a n c e ( ) − > q u e r y ( rows = MysqlConnectionPool::getInstance()->query( rows=MysqlConnectionPool::getInstance()−>query(sql);
  r e s p o n s e − > e n d ( j s o n e n c o d e ( response->end(json_encode( response−>end(jsone​ncode(rows));
  $stop = true;
  }catch (Exception $e){
  usleep(100000);
  }
  }
  });
  //启动http服务器
  $serv->start();***