mysql数据库中2个表建立关系解决思路

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<?php

$DBserver         = "localhost";
$DBname           = "new";
$DBuser           = "root";
$DBpassword       = "";

$con = mysql_connect("localhost","root","");

mysql_select_db("new");

$query = mysql_query("select page_id,page_text from pagecontents where img_exist > 0") or die(mysql_error() );

while($rows = mysql_fetch_array($query))
{
    $pid = $rows['page_id'];
    $ptext = $rows['page_text'];
    $ptext = mysql_real_escape_string($ptext);
    $ptext = preg_replace('/poweredby_mediawiki_88x31\.png/s','',$ptext);
 
if(preg_match_all('/.+\.(gif|swf|jpg|png)/is',$ptext,$match)){
    $ptext = $match[1][0];
    $ptext = mysql_real_escape_string($ptext);
}
    mysql_select_db("lookdb",$con);
    $sql = "update imgmulu set page_id = ('{$pid}')  where img_name = ('{$ptext}')";
    mysql_query($sql) or die(mysql_error()); 
}
?>