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Homephp教程php手册PHP Mysql数据库备份类程序总结

数据库备份类我们只要在网上一搜索在N多的类代码,下面我来总结几款不错数据库备份希望对大家有所帮助.

数据库备份类,使用方法,代码如下:

require_once("backdata.class.php"); 
$link = @mysql_connect("localhost","数据库名","密码") or die ('Could not connect to server.'); 
mysql_query("use cms",$link); 
mysql_query("set names utf8",$link);
$dbbck = new backupData($link);//实例化它,只要一个链接标识就行了 
 
//备份数据时,如想备份一个数据库中的所有表,你可这样写: 
$dbbck->backupTables("cms","./",array('*')); 
 
//备份数据时,如想备份一个数据库中的仅一个表时,你可这样写: 
$dbbck->backupTables("cms","./",array('user')); 
 
//备份数据时,如想备份一个数据库中的多个表时,你可这样写: 
$dbbck->backupTables("cms","./",array('user','acl','informatoin')); 
 
//注解:$dbbck->backupTables("参1","参2",array());中,

参1为:数据库名

参2为:要存放备份数据的位置(即目录地址)

第三个为:你要保存那些表

backdata.class.php,代码如下:

<?php 
/* 
* 
*一个简单的Mysql备份数据类 
* 
*/ 
class backupData{ 
    private    $mysql_link;//链接标识 
    private    $dbName;    //数据库名 
    private    $dataDir;     //数据所要存放的目录 
    private    $tableNames;//表名 
 
    public function __construct($mysql_link){ 
         $this->mysql_link = $mysql_link; 
    } 
    public function backupTables($dbName,$dataDir,$tableNames){//开始备份 
        $this->dbName  = $dbName; 
        $this->dataDir  = $dataDir; 
        $this->tableNames = $tableNames; 
        $tables=$this->delarray($this->tableNames); 
        $sqls=&#39;&#39;; 
        foreach($tables as $tablename){ 
            if($tablename==&#39;&#39;){//表不存在时 
                continue; 
            } 
             
            //************************以下是形成SQL的前半部分************** 
            //如果存在表,就先删除 
            $sqls .= "DROP TABLE IF EXISTS $tablename;n"; 
            //读取表结构 
            $rs = mysql_query("SHOW CREATE TABLE $tablename",$this->mysql_link);   
            $row=mysql_fetch_row($rs); 
            //获得表结构组成SQL 
            $sqls.=$row[&#39;1&#39;].";nn"; 
            unset($rs); 
            unset($row); 
             
            //************************以下是形成SQL的后半部分************** 
            //查寻出表中的所有数据 
            $rs=mysql_query("select * from $tablename",$this->mysql_link); 
            //表的字段个数 
            $field=mysql_num_fields($rs); 
            //形成此种SQL语句:"INSERT INTO `groups` VALUES(&#39;1499e0ca25988d&#39;,&#39;主任&#39;,&#39;&#39;,&#39;0&#39;);" 
            while($rows=mysql_fetch_row($rs)){ 
                $comma=&#39;&#39;;//逗号 
                $sqls.="INSERT INTO `$tablename` VALUES("; 
                for($i=0;$i<$field;$i++){ 
                    $sqls.=$comma."&#39;".$rows[$i]."&#39;"; 
                    $comma=&#39;,&#39;; 
                } 
                $sqls.=");nnn"; 
            } 
        } 
        $backfilepath=$this->dataDir.date("Ymdhis",time()).&#39;.sql&#39;; 
         
        //写入文件 
        $filehandle = fopen($backfilepath, "w"); 
        fwrite($filehandle, $sqls); 
        fclose($filehandle); 
    } 
    private function delarray($array){    //处理传入进来的数组 
        foreach($array as $tables){ 
            if($tables==&#39;*&#39;){    //所有的表(获得表名时不能按常规方式来组成一个数组) 
                $newtables=mysql_list_tables($this->dbName,$this->mysql_link); 
                $tableList = array(); 
                for ($i = 0; $i < mysql_numrows($newtables); $i++){ 
                    array_push($tableList,mysql_tablename($newtables, $i)); 
                } 
                $tableList=$tableList; 
            }else{ 
                $tableList=$array; 
                break; 
            } 
        } 
        return $tableList; 
    } 
}


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