帮我写出判断有无指定字段的语句,谢谢了。
ä¸è¦ç¨mysql_fetch_object()è¿ä¸ªå½æ°æ¥å¤æï¼è¿ä¸ªè¿åæ¥çæ¯ä¸ªæ°ç»ï¼ä¸è¬æ
åµä¸æ¯è¿ä¹æ¥å¤æçï¼$query="select * from ".$tablepre."common_members"." where username ='".$_POST['reg_username']."'";$result=mysql_query($query,$link);$num = mysql_num_rows($result); //åå¾ç»æéä¸è¡çæ°ç®if($num){echo '<script type="text/javascript">alert("ç¨æ·å已被å ç¨ ,请éæ°è¾å
¥ï¼");location.replace("../reg/index.php");</script>';die();}
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