怎么遍历更新没有连续字段的表

如何遍历更新没有连续字段的表?
一个mysql表, 有下列字段
id,cs,

id虽为主键,但值并不连续
1,3,7,8,9,10,.....这种

我需要遍历update这个表,代码写出来了,下面的query不知道该怎么循环了

PHP code

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这里我已得出这个表的总行数

$sql      = "select count(*) from".$db_table;
                    $exec      = mysql_fetch_array($con);
                    $allgoods = $exec[0]; //总行数
                    
                    $sql = "update `".$db_table."' set cs = '".rand($summin,$summax)."' ";//更新语句

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PHP code

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for ($i=0;$i

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PHP code

$sql = "select id from ".$db_table;            
$result = mysql_query($sql,$con);
        while($row=mysql_fetch_object($result)){
                       $id=$row->id;
                    echo $id."<br>";
                    } <div class="clear">
                 
              
              
        
            </div>

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