PHP 初学之登录查询小case

说明：如误入本文，请忽略即可，内容仅为记录。

功能：登录（不验证），查询所有列表，删除记录。--很简单，仅为熟悉代码。

// MySQL，新建数据库data，导入如下sql

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for stu
-- ----------------------------
DROP TABLE IF EXISTS `stu`;
CREATE TABLE `stu` (
`stuid` int(11) NOT NULL AUTO_INCREMENT,
`stuname` varchar(20) NOT NULL,
`stusex` char(1) NOT NULL,
`stuage` tinyint(4) NOT NULL,
`stuadd` varchar(100) NOT NULL,
PRIMARY KEY (`stuid`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8 COMMENT='学生表';

-- ----------------------------
-- Records of stu
-- ----------------------------
INSERT INTO `stu` VALUES ('1', '篱笆', '男', '18', '北京');
INSERT INTO `stu` VALUES ('2', '绾绾', '女', '13', '上海');

//新建login页面

<?php
if (isset($_POST['username']) && isset($_POST['pwd'])) {
header("location:welcome.php?username={$_POST['username']}");
}else{
echo '用户名或密码不能为空！<br/>';
}
?>

<form action="" method="post">
<table>
<tr>
<td>用户名：</td>
<td>密码</td>
</tr>
<tr>
<td><input type="text" name="username"></td>
<td><input type="password" name="pwd"></td>
</tr>
<tr>
<td><input type="submit" name="submit"></td>
</tr>
</table>

</form>

//新建welcome页面

welcome! user:
<b>
<?php
if (isset($_GET['username'])) {
echo $_GET['username'];
}
?>
</b>

<br/>

<script type="text/javascript">
function go(){
location.href='list.php';
}
</script>
<input type="button" value="query list" onclick="go()"/>

//新建list页面

<script type="text/javascript">
function del(id){
location.href='del.php?id='+id;
}
</script>

<table>
<tr>
<th>stuid</th>
<th>stuname</th>
<th>stusex</th>
<th>stuage</th>
<th>stuadd</th>
</tr>

<?php

$link = mysqli_connect('localhost','yourusername','yourpwd') or die(mysql_error());
mysqli_select_db($link, 'data') or die(mysql_error);
mysqli_query($link, 'set names utf8');

$rs = mysqli_query($link, 'select * from stu');

while ($row = mysqli_fetch_array($rs)) {
$id = $row['stuid'];
echo "<tr>";
echo "<td>".$row['stuid']."</td>";
echo "<td>".$row['stuname']."</td>";
echo "<td>".$row['stusex']."</td>";
echo "<td>".$row['stuage']."</td>";
echo "<td>".$row['stuadd']."</td>";
echo "<td>"."<a href='javascript:void()' onclick='del({$id})'>删除（不要点啊）</a>"."</td>";

echo "</tr>";
}

?>
</table>

//新建del页面

<?php
if(isset($_GET['id'])){
$link = mysqli_connect('localhost','yourusername','yourpwd') or die(mysql_error);
mysqli_select_db($link, 'data') or die(mysql_error);
$rs = mysqli_query($link, "delete from stu where stuid = {$_GET['id']}");
var_dump($rs);

echo "已经成功删除了id为{$_GET['id']}的记录<br/>";
}
?>