php结合js实现点击超链接执行删除确认操作

<?php
$dbms='mysql';???????????????????????? //数据库类型,对于开发者来说,使用不同的数据库,只要改这个,不用记住那么多的函数
$host='localhost';???????????????????? //数据库主机名
$dbName='db_database19';??????????? //使用的数据库
$user='root';????????????????????????? //数据库连接用户名
$pass='root';????????????????????????? //对应的暗码
$dsn="$dbms:host=$host;dbname=$dbName";
try {
$pdo = new PDO($dsn,$user,$pass);???? //初始化一个PDO对象,就是创建了数据库连接对象$pdo
$query="select * from tb_pdo_mysql";??? //定义SQL语句
$result=$pdo->prepare($query);??????????? //准备查询语句
$result->execute();??????????????????????? //执行查询语句,并返回结果集
while($res=$result->fetch(PDO::FETCH_ASSOC)){??????? //while循环输出查询结果集,并且设置结果集的为关联索引
?>?????
<tr>
<td height="22" align="center" valign="middle"><?php echo $res['id'];?></td>
<td align="center" valign="middle"><?php echo $res['pdo_type'];?></td>
<td align="center" valign="middle"><?php echo $res['database_name'];?></td>
<td align="center" valign="middle"><?php echo $res['dates'];?></td>
<td align="center" valign="middle"><a href="del(<?php echo $res['id']?>)">删除</a></td>
</tr>
<?php
}
} catch (PDOException $e) {
die ("Error!: " . $e->getMessage() . "<br/>");
}
?>

?<script>
???? function del(_id) {
???????? if (confirm("确认删除"))
???????? {
???????????? window.location.href="index.php?conn_id="+_id;??? //本页面刷新
???????? }
?}
?</script>

<?php
??? if(@$_GET['conn_id']!=""){
??? $dbms='mysql';???????????????????????? //数据库类型,不用记住那么多的函数
??? $host='localhost';???????????????????? //数据库主机名
??? $dbName='db_database19';??????????? //使用的数据库
??? $user='root';????????????????????????? //数据库连接用户名
??? $pass='root';????????????????????????? //对应的暗码
??? $dsn="$dbms:host=$host;dbname=$dbName";
??? try {
??????? $pdo = new PDO($dsn,就是创建了数据库连接对象$pdo
??????? $pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
??????? $query="delete from tb_pdo_mysql where Id=:id";
??????? $result=$pdo->prepare($query);??????????? //预准备语句
??????? $result->bindParam(':id',$_GET['conn_id']);??????? //绑定更新的数据
??????? $result->execute();
??? } catch (PDOException $e) {
??????? echo 'PDO Exception Caught.';
??????? echo 'Error with the database:<br/>';
??????? echo? 'SQL Query: '.$query;
??????? echo '<pre>';
??????? echo "Error: " . $e->getMessage(). "<br/>";???????
??????? echo "Code: " . $e->getCode(). "<br/>";
??????? echo "File: " . $e->getFile(). "<br/>";
??????? echo "Line: " . $e->getLine(). "<br/>";
??????? echo "Trace: " . $e->getTraceAsString(). "<br/>";
??????? echo '</pre>';
??? }
}
?>