mysql Proxy讀寫分離配置與php mysql讀寫分離類

mysql-proxy \ –proxy-backend-addresses=narcissus:3306 \ –proxy-backend-addresses=nostromo:3306 複製代碼 3、資料庫讀寫分離，192.168.18.110負責寫入，192.168.18.107負責讀取資料，當然也可以再增加讀取資料的伺服器。 mysql-proxy \ –proxy-backend-addresses=192.168.18.110:3306 \ –proxy-read-only-backend-addresses=192.168.18.107:3306 複製代碼 這種方式並不是讀寫分離。mysql-proxy不能區分哪些是發往從伺服器的，還需要自己用指令碼控制，見第四種方式。 4、 Lua 指令碼能很好的控制串連和分布, 以及查詢及返回的結果集.使用Lua指令碼時，必須使用 –proxy-lua-script 指定指令碼的名稱。直到產生串連時才會讀取指令碼，也就是修改指令碼後不用重新啟動服務。mysql-proxy –proxy-lua-script=rw-splitting.lua –proxy-backend-addresses=192.168.18.110:3306 –proxy-read-only-backend-addresses=192.168.18.107:3306 注意問題：1、proxy的讀寫分離機制是先把最初的幾條查詢發到master上建立串連，當發送到master上的查詢數超過串連池的最小值時開始把查詢 2、LAST_INSERT_ID不能發送到主伺服器上， 226 行修改為下面的就可以了elseif not is_insert_id and token.token_name == “TK_FUNCTION” then 3、使用預設的rw-splitting.lua時，會提示找不到proxy-command，我把mysql-proxy的路徑設定為系統路徑，然後在 share目錄下運行就一切Ok了，在運行中輸入cmd，然後cd C:\tools\mysql-proxy\share。 4、字元亂碼通過proxy連上資料庫之後，查到的字串始終是亂碼，即便手工執行了set names ‘utf8′也沒有效果。解決辦法，mysql server必須設定 class mysql_rw_php { //查詢個數 var $querynum = 0; //當前操作的資料庫連接 var $link = null; //字元集 var $charset; //當前資料庫 var $cur_db = ''; //是否存在有效唯讀資料庫連接 var $ro_exist = false; //唯讀資料庫連接 var $link_ro = null; //讀寫資料庫連接 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 && $this->halt('Can not connect to MySQL server'); } } //唯讀串連失敗 if(!$this->link && !$halt) return false; //未初始化rw時，第一個串連作為rw if($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); } } //串連一個唯讀mysql資料庫 function connect_ro($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0){ if($this->link_rw == null) $this->link_rw = $this->link; $this->link = null; //不產生halt錯誤 $this->connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect, false); if($this->link){ //串連成功 //echo "link ro sussess! "; $this->ro_exist = true; $this->link_ro = $this->link; if($this->cur_db){ //如果已經選擇過資料庫則需要操作一次 @mysql_select_db($this->cur_db, $this->link_ro); } }else{ //串連失敗 //echo "link ro failed! "; $this->link = &$this->link_rw; } } //設定一系列唯讀資料庫並且串連其中一個 function set_ro_list($ro_list){ if(is_array($ro_list)){ //隨機播放其中一個 $link_ro = $ro_list[array_rand($ro_list)]; $this->connect_ro($link_ro['dbhost'], $link_ro['dbuser'], $link_ro['dbpw']); } } function select_db($dbname) { //同時操作兩個資料庫連接 $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; //判斷是否select語句 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(); } } ?> 複製代碼 調用樣本： /**************************************** *** mysql-rw-php version 0.1 *** http://bbs.it-home.org *** 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'=>'bbs.it-home.org', 'dbuser'=>'jbxue', 'dbpw'=>'bbs.it-home.org', 'dbname'=>'test' ); $db_ro = array( array( 'dbhost'=>'bbs.it-home.org:4306', 'dbuser'=>'jbxue', 'dbpw'=>'bbs.it-home.org' ) ); $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]; } ?> 複製代碼

