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HomeBackend DevelopmentPHP Tutorialphp MYSQL 数据备份类_php实例

功能上有: ­
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
ok...
­
以下为代码:

复制代码 代码如下:

/*
*
*简单的一个备份数据类
*author FC
*
*/
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);
$sqls='';
foreach($tables as $tablename){
if($tablename==''){//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['1'].";\n\n";
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('1499e0ca25988d','主任','','0');"
while($rows=mysql_fetch_row($rs)){
$comma='';//逗号
$sqls.="INSERT INTO `$tablename` VALUES(";
for($i=0;$i$sqls.=$comma."'".$rows[$i]."'";
$comma=',';
}
$sqls.=");\n\n\n";
}
}
$backfilepath=$this->dataDir.date("Ymdhis",time()).'.sql';
//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=='*'){//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; $i array_push($tableList,mysql_tablename($newtables, $i));
}
$tableList=$tableList;
}else{
$tableList=$array;
break;
}
}
return $tableList;
}
}
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