php+MySQL Proxy高速实现读写分离以及负载均衡，故障转移

php+MySQL Proxy快速实现读写分离以及负载均衡，故障转移
?

public function isReadOperation($sql) {return preg_match('/^\s*(SELECT|SHOW|DESC|PRAGMA)\s+/i',$sql);}

php读写分离类

?
<?php/******************************************* mysql-rw-php version 0.1 @ 2009-4-16*** code by hqlulu#gmail.com*** http://www.aslibra.com*** http://code.google.com/p/mysql-rw-php/*** code modify from class_mysql.php (uchome)****************************************/class mysql_rw_php {//查询个数var $querynum = 0;//当前操作的数据库连接var $link = null;//字符集var $charset;//当前数据库var $cur_db = '';//是否存在有效的只读数据库连接var $ro_exist = false;//只读数据库连接var $link_ro = null;//读写数据库连接var $link_rw = null;function mysql_rw_php(){}function connect($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $halt = TRUE) {if($pconnect) {if(!$this->link = @mysql_pconnect($dbhost, $dbuser, $dbpw)) {$halt && $this->halt('Can not connect to MySQL server');}} else {if(!$this->link = @mysql_connect($dbhost, $dbuser, $dbpw)) {$halt && $this->halt('Can not connect to MySQL server');}}//只读连接失败if(!$this->link && !$halt) return false;//未初始化rw时，第一个连接作为rwif($this->link_rw == null)$this->link_rw = $this->link;if($this->version() > '4.1') {if($this->charset) {@mysql_query("SET character_set_connection=$this->charset, character_set_results=$this->charset, character_set_client=binary", $this->link);}if($this->version() > '5.0.1') {@mysql_query("SET sql_mode=''", $this->link);}}if($dbname) {$this->select_db($dbname);}}//连接一个只读的mysql数据库function connect_ro($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0){if($this->link_rw == null)$this->link_rw = $this->link;$this->link = null;//不产生halt错误$this->connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect, false);if($this->link){//连接成功//echo "link ro sussess!<br>";$this->ro_exist = true;$this->link_ro = $this->link;if($this->cur_db){//如果已经选择过数据库则需要操作一次@mysql_select_db($this->cur_db, $this->link_ro);}}else{//连接失败//echo "link ro failed!<br>";$this->link = &$this->link_rw;}}//设置一系列只读数据库并且连接其中一个function set_ro_list($ro_list){if(is_array($ro_list)){//随机选择其中一个$link_ro = $ro_list[array_rand($ro_list)];$this->connect_ro($link_ro['dbhost'], $link_ro['dbuser'], $link_ro['dbpw']);}}function select_db($dbname) {//同时操作两个数据库连接$this->cur_db = $dbname;if($this->ro_exist){@mysql_select_db($dbname, $this->link_ro);}return @mysql_select_db($dbname, $this->link_rw);}function fetch_array($query, $result_type = MYSQL_ASSOC) {return mysql_fetch_array($query, $result_type);}function fetch_one_array($sql, $type = '') {$qr = $this->query($sql, $type);return $this->fetch_array($qr);}function query($sql, $type = '') {$this->link = &$this->link_rw;//判断是否select语句if($this->ro_exist && preg_match ("/^(\s*)select/i", $sql)){$this->link = &$this->link_ro;}$func = $type == 'UNBUFFERED' && @function_exists('mysql_unbuffered_query') ?'mysql_unbuffered_query' : 'mysql_query';if(!($query = $func($sql, $this->link)) && $type != 'SILENT') {$this->halt('MySQL Query Error', $sql);}$this->querynum++;return $query;}function affected_rows() {return mysql_affected_rows($this->link);}function error() {return (($this->link) ? mysql_error($this->link) : mysql_error());}function errno() {return intval(($this->link) ? mysql_errno($this->link) : mysql_errno());}function result($query, $row) {$query = @mysql_result($query, $row);return $query;}function num_rows($query) {$query = mysql_num_rows($query);return $query;}function num_fields($query) {return mysql_num_fields($query);}function free_result($query) {return mysql_free_result($query);}function insert_id() {return ($id = mysql_insert_id($this->link)) >= 0 ? $id : $this->result($this->query("SELECT last_insert_id()"), 0);}function fetch_row($query) {$query = mysql_fetch_row($query);return $query;}function fetch_fields($query) {return mysql_fetch_field($query);}function version() {return mysql_get_server_info($this->link);}function close() {return mysql_close($this->link);}function halt($message = '', $sql = '') {$dberror = $this->error();$dberrno = $this->errno();echo "<div style="position:absolute;font-size:11px;font-family:verdana,arial;background:#EBEBEB;padding:0.5em;"><b>MySQL Error</b><br><b>Message</b>: $message<br><b>SQL</b>: $sql<br><b>Error</b>: $dberror<br><b>Errno.</b>: $dberrno<br></div>";exit();}}?>

?调用方法

?
<?php/******************************************* mysql-rw-php version 0.1 @ 2009-4-16*** code by hqlulu#gmail.com*** http://www.aslibra.com*** http://code.google.com/p/mysql-rw-php/*** code modify from class_mysql.php (uchome)****************************************/require_once('mysql_rw_php.class.php');//rw info$db_rw = array('dbhost'=>'www.aslibra.com','dbuser'=>'aslibra','dbpw'=>'www.aslibra.com','dbname'=>'test');$db_ro = array(array('dbhost'=>'www.aslibra.com:4306','dbuser'=>'aslibra','dbpw'=>'www.aslibra.com'));$DB = new mysql_rw_php;//connect Master$DB->connect($db_rw[dbhost], $db_rw[dbuser], $db_rw[dbpw], $db_rw[dbname]);//Method 1: connect one server$DB->connect_ro($db_ro[0][dbhost], $db_ro[0][dbuser], $db_ro[0][dbpw]);//Method 2: connect one server from a list by rand$DB->set_ro_list($db_ro);//send to rw$sql = "insert into a set a='test'";$DB->query($sql);//send to ro$sql = "select * from a";$qr = $DB->query($sql);while($row = $DB->fetch_array($qr)){echo $row[a];}?>