php中怎么实现Mysql读写分离操作

php中怎么实现Mysql读写分离操作，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。

连接案例：

'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;//写入连接，单服务器操作$DB->connect($db_rw[dbhost], $db_rw[dbuser], $db_rw[dbpw], $db_rw[dbname]);  //读取连接，可以多服务器操作$DB->connect_ro($db_ro[0][dbhost], $db_ro[0][dbuser], $db_ro[0][dbpw]);$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];}?>

连接类：

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 && !$halt) return false;                                //未初始化rw时，第一个连接作为rw                if($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!
";                        $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!
";                        $this->link = &$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 "
                                MySQL Error
                                Message: $message
                                SQL: $sql
                                Error: $dberror
                                Errno.: $dberrno
                                
";                exit();        }}?>

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