php mysql 怎么实现读写分离

发布网友发布时间：2022-04-30 21:52

共2个回答

懂视网时间：2022-05-02 10:23

<?php
/*
php如何连接mysql
*/

/*$link = mysql_connect(‘localhost‘, ‘root‘, ‘‘);
if (!$link) {
die(‘Could not connect: ‘ . mysql_error());
}
echo ‘Connected successfully‘;
mysql_close($link);*/

/*php如何选择数据库*/
/*$link = mysql_connect(‘localhost‘, ‘root‘, ‘‘);
if (!$link) {
die(‘Could not connect: ‘ . mysql_error());
}

$selectdb = mysql_select_db(‘wiki‘, $link);
var_dump($selectdb);
mysql_close($link);*/

/*php如何执行mysql的查询*/
/*$link = mysql_connect(‘localhost‘, ‘root‘, ‘‘);
if (!$link) {
die(‘Could not connect: ‘ . mysql_error());
}

$selectdb = mysql_select_db(‘wiki‘, $link);
$query = mysql_query("select title from wiki_doc limit 1",$link);
var_dump($query);
mysql_close($link);*/

/*php如何获取查询到的数据*/
$link = mysql_connect(‘localhost‘, ‘root‘, ‘‘);
if (!$link) {
die(‘Could not connect: ‘ . mysql_error());
}
//mysql_query("set names utf8");
$selectdb = mysql_select_db(‘wiki‘, $link);
$query = mysql_query("select title from wiki_doc limit 10",$link);
while($doc = mysql_fetch_array($query,$link)){
$doclist[] = $doc;
}
var_dump($doclist);
mysql_close($link);

/*php执行数据库读写分离*/
$readlink = mysql_connect(‘localhost‘, ‘root‘, ‘‘);
//mysql_query("set names utf8");
$readdb = mysql_select_db(‘wiki‘, $readlink);
$readquery = mysql_query("select title from wiki_doc limit 10",$readlink);
while($doc = mysql_fetch_array($readquery,$readlink)){
$doclist[] = $doc;
}
var_dump($doclist);

$writelink = mysql_connect(‘localhost‘, ‘root‘, ‘‘);
//mysql_query("set names utf8");
$writedb = mysql_select_db(‘wiki‘, $writelink);
$writequery = mysql_query(" update wiki_doc set title=‘124‘ where did=45",$writelink);

var_dump($doclist);

Mysql读写分离php脚本

标签：while from 数据 success erro read sel php脚本 query

热心网友时间：2022-05-02 07:31

<?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_mp($db->get_res());