1、Introduction
之前写过2篇文章,分别是:
基于此,我们再实现简单的PHP+Mysql读写分离,从而提高数据库的负载能力。
2、代码实战
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<?php class Db { private $res ; function __construct( $sql ) { $querystr = strtolower (trim( substr ( $sql ,0,6))); //如果是select,就连接slave服务器 if ( $querystr == 'select' ) { $res = $this ->slave_select( $sql ); $this ->res= $res ; } //如果不是select,就连接master服务器 else { $res = $this ->master_change( $sql ); $this ->res= $res ; } } /** * slave从库返回sql查询结果 * @param $sql * @return array */ private function slave_select( $sql ){ //该处只是随机获取slave节点的ip,当然,还可以采用其他算法获取slave_ip $slave_server = $this ->get_slave_ip(); $dsn = "mysql:host=$slave_server;dbname=test" ; $user = 'root' ; $pass = '123456' ; $dbh = new PDO( $dsn , $user , $pass ); return $dbh ->query( $sql )->fetchAll(PDO::FETCH_ASSOC); } /**master主库返回sql执行结果 * @param $sql * @return int */ private function master_change( $sql ){ $master_server = '192.168.33.22' ; $dsn = "mysql:host=$master_server;dbname=test" ; $user = 'root' ; $pass = '123456' ; $dbh = new PDO( $dsn , $user , $pass ); return $dbh -> exec ( $sql ); } /** * 随机获取slave-ip * @return mixed */ private function get_slave_ip(){ $slave_ips =[ '192.168.33.33' , '192.168.33.44' ]; $count = count ( $slave_ips )-1; $random_key =mt_rand(0, $count ); return $slave_ips [ $random_key ]; } /** * 获取结果 * @return int */ public function get_res(){ return $this ->res; } } $sql1 = "select * from t1" ; $sql2 = "insert into t1 (name) values ('haha')" ; $sql3 = "delete from t1 where id=1" ; $sql4 = "update t1 set name='Jerry' where id=2" ; $db = new Db( $sql1 ); //$db = new Db($sql2); //$db = new Db($sql3); //$db = new Db($sql4); var_dump( $db ->get_res()); |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://segmentfault.com/a/1190000008664288