今天的面试题

<?php
	$mysql_sname = 'localhost';
	//用户名
	$mysql_uname = 'root';
	//密码
	$mysql_upwd = '12345';
	//数据库名
	$mysql_dbname = 'test';
	//链接数据库
	$conn = mysql_connect($mysql_sname,$mysql_uname,$mysql_upwd) or die("数据库链接失败！");
	//选择数据库
	$db_select = mysql_select_db($mysql_dbname, $conn);
	//查询
	$sql_s = "select * from a";
	//执行sql
	$result = mysql_query($sql_s,$conn);
	//显示查询结果
	while($row = mysql_fetch_row($result)){
		echo "<br/>";
		for($i=0;$i<count($row);$i++){
			echo "<td>".$row[$i]."</td>";
		}
	}
	//删除
	$sql_d = "delete from a where id=8";
	mysql_query($sql_d,$conn);
	//增加
	$sql_i = " INSERT into a VALUES ( '', 'asd', '666') ";
	mysql_query($sql_i,$conn);
	//修改
	$sql_u = "update a set name = 'sdfsdfsdf' where id =7 ";
	mysql_query($sql_u,$conn);
	mysql_close($conn);
?>