PHP+MYSQL implements simple sample code for separation of reading and writing

This article mainly introduces PHP+MYSQL to achieve reading and writing separation. It analyzes the techniques of reading and writing 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

Based on this, we will implement simple PHP+Mysql read and 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 == &#39;select&#39;)
    {
      $res=$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=&#39;root&#39;;
    $pass=&#39;123456&#39;;
    $dbh=new PDO($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=&#39;192.168.33.22&#39;;
    $dsn="mysql:host=$master_server;dbname=test";
    $user=&#39;root&#39;;
    $pass=&#39;123456&#39;;
    $dbh=new PDO($dsn, $user, $pass);
    return $dbh->exec($sql);
  }

  /**
   * 随机获取slave-ip
   * @return mixed
   */
  private function get_slave_ip(){
    $slave_ips=[&#39;192.168.33.33&#39;,&#39;192.168.33.44&#39;];
    $count=count($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 (&#39;haha&#39;)";
$sql3 = "delete from t1 where id=1";
$sql4 = "update t1 set name=&#39;Jerry&#39; where id=2";

$db = new Db($sql1);
//$db = new Db($sql2);
//$db = new Db($sql3);
//$db = new Db($sql4);

var_dump($db->get_res());

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