本文实例讲述了php实现的mysqldb读写分离操作类。分享给大家供大家参考，具体如下：

/*** php MysqlDB 读写分离类* -----------------------------------------------------* $Source: http://code.ilaopo.net/php.class.mysqldb $* $Author: Bevin Chen $* $Email: bevin#lifa8.cn $* $Date: 2009-10-10 $* -----------------------------------------------------*/class mysqldb { var $querynum = 0; var $linkr,$linkw,$charset,$pconnect,$dbconfig; function __constructor($dbarray) { $this->mysqldb($dbarray); } function mysqldb($dbarray,$dbcharset='utf8',$pcontent=0) { if(!is_array($dbarray[0])) { echo "数据库参数错误"; return false; } $this->charset = $dbcharset; $this->pconnect = $pconnect; $this->dbconfig['master'] = $dbarray[0]; $dbServerNum = count($dbarray); if($dbServerNum > 1) { /* * 当x=1 时，$dbarray[0]不作slave * 当x=0 时，$dbarray[0]作slave */ $x = 1; $rand = rand($x,$dbServerNum-1); $this->dbconfig['slave'] = $dbarray[$rand]; } else { $this->dbconfig['slave'] = false; } } function connect($dbhost,$dbuser,$dbpw,$dbname) { if($this->pconnect) { $link = @mysql_pconnect($dbhost, $dbuser, $dbpw); } else { $link = @mysql_connect($dbhost, $dbuser, $dbpw, 1); } if($link) { if($this->version($link) > '4.1') { if($this->charset) { @mysql_query("SET character_set_connection=".$this->charset.", character_set_results=".$this->charset.", character_set_client=binary", $link); } if($this->version($link) > '5.0.1') { @mysql_query("SET sql_mode=''", $link); } } if($dbname) { @mysql_select_db($dbname, $link); } //print_r($link); return $link; } else { return false; } } function connectM() { if(!$this->linkw = $this->connect($this->dbconfig['master'][0],$this->dbconfig['master'][1],$this->dbconfig['master'][2],$this->dbconfig['master'][3])) { exit("主数据库连接失败！"); } //echo "<br>##connectM!.<br>"; } function connectS() { if($this->dbconfig['slave']) { if(!$this->linkr = $this->connect($this->dbconfig['slave'][0],$this->dbconfig['slave'][1],$this->dbconfig['slave'][2],$this->dbconfig['slave'][3])) { $this->dbconfig['slave'] = false; $this->connectS(); } //echo "<br>##connectS!.<br>"; } else { if(!$this->linkw) { $this->connectM(); } $this->linkr = $this->linkw; } } // db read function query($sql, $type = '') { if(!$this->linkr) { $this->connectS(); } $func = $type == 'UNBUFFERED' && @function_exists('mysql_unbuffered_query') ? 'mysql_unbuffered_query' : 'mysql_query'; $query = $func($sql, $this->linkr); $this->querynum++; return $query; } function fetch_array($query, $result_type = MYSQL_ASSOC) { return @mysql_fetch_array($query, $result_type); } function fetch_row($query) { $query = mysql_fetch_row($query); return $query; } function fetch_One($sql) { $query = $this->query($sql); return $this->fetch_row($query); } function fetch_page($sql, $pagenum) { $page = intval($_GET['page']); $query = $this->query($sql); $countnum = $this->num_rows($query); $countpage = ceil($countnum/$pagenum); if($page<1) { $page=1; } if($page>$countpage) { $page=$countpage; } $limitstart = ($page-1)*$pagenum; for ($i=0; $i<($limitstart+$pagenum); $i++) { if($i>=$countnum) { break; } if($i>=$limitstart) { $result[] = $this->fetch_array($query); } else { $this->fetch_array($query); } } $url = $_SERVER['QUERY_STRING']; $url = preg_replace("/&?page=[0-9]+/i","",$url); $array['countnum'] = $countnum; $array['countpage'] = $countpage; $array['result'] = $result; $array['page'] = $page; if($page>1) { $array['preurl'] = "?".$url."&page=".($page-1); $array['prepage'] = $page-1; } else { $array['preurl'] = "?".$url."&page=1"; $array['prepage'] = 1; } if($page<$countpage) { $array['nexturl'] = "?".$url."&page=".($page+1); $array['nextpage'] = $page+1; } else { $array['nexturl'] = "?".$url."&page=".$countpage; $array['nextpage'] = $countpage; } $array['firsturl'] = "?".$url."&page=1"; $array['firstpage'] = 1; $array['lasturl'] = "?".$url."&page=".$countpage; $array['lastpage'] = $countpage; $array['nopage'] = "?".$url."&page="; return $array; } // db write function queryw($sql, $type = '') { if(!$this->linkw) { $this->connectM(); } $func = $type == 'UNBUFFERED' && @function_exists('mysql_unbuffered_query') ? 'mysql_unbuffered_query' : 'mysql_query'; $query = $func($sql, $this->linkw); $this->querynum++; return $query; } function update($table,$where,$array) { $whereset = $set = $dot = ''; foreach($array as $key=>$value) { $set .= $dot." `$key`='$value'"; $dot = ','; } $whereset = $dot = ''; foreach($where as $k=>$v) { $whereset .= $dot." `$k`='$v'"; $dot = ' and '; } $sql = "update $table set $set where $whereset"; return $this->queryw($sql); } function insert($table,$array) { $col = $v = $dot = ''; foreach($array as $key=>$value) { $v .= $dot."'$value'"; $col .= $dot."`$key`"; $dot = ','; } $sql = "insert into $table ($col) values ($v)"; if($this->queryw($sql)) { return $this->insert_id(); } else { return false; } } function insert_id() { return ($id = mysql_insert_id($this->linkw)) >= 0 ? $id : $this->result($this->queryw("SELECT last_insert_id()"), 0); } // db other function affected_rows($link) { return mysql_affected_rows($link); } function error($link) { return (($link) ? mysql_error($link) : mysql_error()); } function errno($link) { return intval(($link) ? mysql_errno($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($query); } function fetch_fields($query) { return mysql_fetch_field($query); } function version($link) { return mysql_get_server_info($link); } function close($link) { return mysql_close($link); }}/* 测试例子 //* $dbarray[] = array('localhost','bevin','password','test');* $dbarray[] = array('ilaopo.net','root','password','test');* $dbarray[] = array('192.168.1.77','cxh','password','test');* $newdb = new mysqldb($dbarray,'utf8');* $array = array('name' => date("Y-m-d H:i:s"));* $id = $newdb->insert("test",$array);* $result = $newdb->fetch_page("select * from test order by id desc",'10');* print_r($result);* $id = $newdb->insert("test",$array);* echo $id;*/

PS：为便于读者阅读源码，上述代码使用在线工具http://tools.jb51.net/code/jb51_php_format进行了格式化处理。

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