This article mainly introduces the implementation of read-write separation in PHP MYSQL. It analyzes the techniques of read-write separation with examples, thereby improving the load capacity of the database. It has certain reference value. Those who are interested can learn more.
1. Introduction
I have written 2 articles before, namely:
The principle of Mysql master-slave synchronization
Myql master-slave synchronization practice
Based on this, we will implement a simple PHP Mysql read-write separation to improve the load capacity of the database.
2. Code practice
<?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());
The above is the entire content of this article, I hope it will help everyone learn Helps.
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