[日常] PHP与Mysql测试kill慢查询并检验PDO的错误模式

<?php

try{

        //1. pdo的错误模式，抛出异常，不记录到php的error日志，不影响代码继续运行,
        $opts=array(
                PDO::ATTR_ERRMODE               => PDO::ERRMODE_EXCEPTION,
        );  

        $pdo=new PDO("mysql:host=localhost;dbname=pan","root","xxxx",$opts);
        $pdo->query('set names utf8');
        $sth=$pdo->prepare("select sleep(20) from texts where title like '%测试%'");
        $sth->execute(array("title"=>"测试"));
        $res=$sth->fetchAll(PDO::FETCH_ASSOC);
        print_r($res);

}catch(Exception $e){

        //2. code不是整型，如果不进行处理，会在此处报Fatal的500错误
        //Fatal error: Uncaught Error: Wrong parameters for MyDbException([string $message [, long $code [, Throwable $previous = NULL]]])
        throw new MyDbException($e->getMessage(),intval($e->getCode()));
}

class MyDbException extends Exception{

}

echo "1111111";

/*
3.测试慢查询
        3.1 sql语句中使用 select sleep(20) from
        3.2 开启慢查询日志：
                配置文件：/etc/mysql/mysql.conf.d/mysqld.cnf
                slow_query_log = ON
                slow_query_log_file = /usr/local/mysql/data/slow.log
                long_query_time = 1

                show variables like 'slow_query%';
                show variables like 'long_query_time';
        3.3 kill掉mysql的连接线程
                show full processlist;
                kill id号
*/