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'].";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('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.=");nnn";

}

}

$backfilepath=$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; $i < mysql_numrows($newtables); $i++){

array_push($tableList,mysql_tablename($newtables, $i));

}

$tableList=$tableList;

}else{

$tableList=$array;

break;

}

}

return $tableList;

}

}

?>