PHP+MYSQL查询数据库导致系统很卡！
PHP代码：
<br>nbsp;html><!--STATUS OK--> <br><meta><br><br><style><br />table,td{border:1px solid #ccc;}<br />td{padding:10px}<br /><br /></style><br><br><br><br><?php <br />$dbh = @mysql_connect("localhost:3306","root","123456");<br> <br> /* 定义变量dbh , mysql_connect()函数的意思是连接mysql数据库, "@"的意思是屏蔽报错 */<br>if(!$dbh){die("error");}<br>/* die()函数的意思是将括号里的字串送到浏览器并中断php程式 (script)。括号里的参数为欲送出的字串。 */<br>@mysql_select_db("data", $dbh);<br><br>mysql_query("SET NAMES data");<br><br><br><br>?><br><br><br><br><br><br><br><center>
<br><form>
<br><input><br><input><br><input><br><span><br><input></span>
</form>
<br><br>
</center><br><br><br>$wd=$_POST["wd"];<br>/* 选择mysql服务器里的一个数据库,这里选的数据库名为 ok */<br>$q = "(select * from tabal where user like '$wd%' or email LIKE '$wd%')<br>union all<br>(select * from tabal1 where user like '$wd%' or email LIKE '$wd%')<br>union all<br>(select * from tabal2 where user like '$wd%' or email LIKE '$wd%')<br>union all<br>(select * from tabal3 where user like '$wd%' or email LIKE '$wd%')<br>union all<br>(select * from tabal4 where user like '$wd%' or email LIKE '$wd%')<br>union all<br>(select * from tabal5 where user like '$wd%' or email LIKE '$wd%')<br>union all<br>(select * from tabal6 where user like '$wd%' or email LIKE '$wd%')<br>union all<br>(select * from tabal7 where user like '$wd%' or email LIKE '$wd%')<br>union all<br>(select * from tabal8 where user like '$wd%' or email LIKE '$wd%')<br>union all<br>(select * from tabal9 where user like '$wd%' or email LIKE '$wd%')<br>union all<br>(select * from tabal10 where email LIKE '$wd%')<br>union all<br>(select * from tabal11 where user like '$wd%' or email LIKE '$wd%') LIMIT 0,20";<br><br>/* 定义变量q, "select * from abc"是一个sql语句,意思是读取表abc中的数据 */<br>?><br><br><br><br><center>
<br><table>
<br><br><br>$rs = mysql_query($q, $dbh);<br><br>while($row = mysql_fetch_array($rs))<br><br>echo "<tr>
<td>$row[user]</td> <td>$row[pass]</td> <td>$row[email]</td>
</tr> ";<br><br>?><br><br>
</table>
<br><br>
</center><br> <br><br>@mysql_close($dbh);<div class="clear">
</div>
