Related content of mysql read-write separation implemented by PHP

This article mainly introduces the mysql read and write separation operation implemented by PHP. It briefly describes the principle of mysql read and write separation, and combines the examples to give relevant implementation skills of PHP for mysql read and write sql statements to operate different databases. , Friends who need it can refer to

The example in this article describes the mysql read-write separation operation implemented by PHP. Share it with everyone for your reference, the details are as follows:

First of all, the mysql master and slave need to be configured. The basic principle is to determine whether the sql statement is select. If so, go to the master library, otherwise check from the slave

<?php
/**
* mysql读写分离
*/
class db{
  public function __construct($sql){
    $chestr = strtolower(trim($sql));
    //判断sql语句有select关键字的话，就连接读的数据库,否则就连接写数据库
    if(substr($chestr,0,6)==&#39;select&#39;)
    {
      echo &#39;I am using slave db..<br>&#39;;
      $link = mysql_connect("192.168.20.201:3306", "open", "123456") or die("Could not connect: " . mysql_error());
      mysql_select_db("hadoop");
      $result = mysql_query($sql);
      while($row = mysql_fetch_array($result,MYSQL_ASSOC)){
        $data[]=$row;
      }
      //print_r($data);exit;
      echo mysql_get_host_info($link).mysql_get_server_info($link).mysql_get_proto_info($link).mysql_get_client_info().&#39;<br>&#39;;
    }else{
      echo &#39;I am using master db..<br>&#39;;
      $link = mysql_connect("192.168.20.195:3306","open","123456") or die("Could not connect: " . mysql_error());
      mysql_select_db("hadoop");
      $result = mysql_query($sql);
      //echo @mysql_affected_rows($result);
      echo mysql_get_host_info($link).mysql_get_server_info($link).mysql_get_proto_info($link).mysql_get_client_info().&#39;<br>&#39;;
    }
  }
}
$master = new db("INSERT INTO user (id,name)VALUES (NULL,&#39;100&#39;)");
$slave = new db("SELECT * from `user`");

Result:

I am using master db..
192.168.20.195 via TCP/IP5.1.73-log10mysqlnd 5.0.8-dev - 20102224 - $Id: 731e5b87ba42146a687c29995d2dfd8b4e40b325 $
I am using slave db..
192.168.20.201 via TCP/IP5.1.73-log10mysqlnd 5.0.8-dev - 20102224 - $Id: 731e5b87ba42146a687c29995d2dfd8b4e40b325 $

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