嗨伙计们，我有一个错误“Undefined index：id”任何人都可以帮助我。谢谢 [英] Hi guys, im having a error "Undefined index: id" anyone can help me about this. thanks
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问题描述
我的错误在这行$ query =DELETE FROM users WHERE id =。$ mysqli-> real_escape_string（$ _ GET ['id']）。;
< html >
< head >
< title > MySQLi删除记录< / title >
< / head >
< 正文 >
// include数据库连接
包括'db_connect.php';
$ action = isset（$ _ GET ['action']）？ $ _GET ['action']：;
if（$ action =='delete'）{//如果用户点击确定，运行我们的删除查询
// $ mysqli-> real_escape_string（）函数帮助我们防止SQL注入等攻击
$ query =DELETE FROM users WHERE id =。$ mysqli-> real_escape_string（$ _ GET ['id']）。;
//执行查询
if（$ mysqli-> query（$ query））{
//如果成功删除
echo用户已被删除。;
} else {
//如果存在数据库问题
echo数据库错误：无法删除记录。;
}
}
$ query =select * from users;
$ result = $ mysqli-> query（$ query）;
$ num_results = $ result-> num_rows;
echo< div > < a href = add.php > 创建新记录< / a > < / div > ;
if（$ num_results）{
echo< 表 border = 1 > ;
echo< tr > ;
echo< th > 名字< / th > ;
echo< th > 姓氏< / th > ;
echo< th > 用户名< / th > ;
echo< th > 操作< / th > ;
echo< / tr > ;
//循环显示每条记录
while（$ row = $ result-> fetch_assoc（））{
extract（$ row） ）;
echo< tr > ;
echo< td > {$ firstname} < / td > ;
echo< td > <$ span> {$ lastname} < / td > ;
echo< td > <$ span> {$ username} < / td > ;
echo< td > ;
echo< a href = edit.php？ id = {$ id} > 编辑< / a > ;
echo/;
//点击我们的删除链接，会出现一个弹出窗口。
//这意味着它运行我们的删除JavaScript
echo< a href = ＃ > 删除< / a > ;
echo< / td > ;
echo< / tr > ;
}
echo< / table > ;
} else {
echo未找到任何记录。;
}
$ result-> free（）;
$ mysqli-> close（）;
？>
< script 类型 =' text / javascript' >
function delete_user（id）{
// 提示用户
var answer = confirm（' 你确定吗？'）;
如果（回答）{ // 如果用户点击确定
// 通过操作重定向到网址as删除记录的删除和ID
window 。 location = ' delete.php？action = delete& id =' + id;
}
}
< / script >
< / body >
< / html > 我的display.php
echo< div > < a href =' add.php' > 创建新记录< < span class =code-leadattribute> / a > < / div > ;
if（$ num_results> 0）{//这意味着已有数据库记录
echo< 表 border =' 1' > ; //起始表
//创建我们的表格标题
echo< tr > ;
echo< th > 名字< / th > ;
echo< th > 姓氏< / th > ;
echo< th > 用户名< / th > ;
echo< th > 操作< / th > ;
echo< / tr > ;
//循环显示每条记录
while（$ row = $ result-> fetch_assoc（））{
//提取行
//这将使$ row ['firstname']变为
//只需$ firstname
extract（$ row）;
//为每条记录创建新的表格行
echo< tr > ;
echo< td > {$ firstname} < / td > ;
echo< td > <$ span> {$ lastname} < / td > ;
echo< td > <$ span> {$ username} < / td > ;
echo< td > ;
//只需准备编辑链接即可编辑记录
echo< a href = ' edit.php？id = {$ id}' > 编辑< / a > ;
echo/;
//只是准备删除链接以删除记录
echo< a href = ' delete.php' > 删除< / a > ;
echo< / td > ;
echo< / tr > ;
}
echo< / table > ; //结束表
}否则{
//如果数据库表为空
echo未找到记录。;
}
解决方案
query =DELETE FROM users WHERE id =。
mysqli-> real_escape_string（
_GET [ 'ID']） ;
< html >
< head >
< title > MySQLi删除记录< / title >
< / head >
< 正文 >
//包括数据库连接
包括'db_connect.php';
my error is in this line " $query = "DELETE FROM users WHERE id = ".$mysqli->real_escape_string($_GET['id']).""; "
<html>
<head>
<title>MySQLi Delete Record</title>
</head>
<body>
//include database connection
include 'db_connect.php';
$action = isset($_GET['action']) ? $_GET['action'] : "";
if($action=='delete'){ //if the user clicked ok, run our delete query
//$mysqli->real_escape_string() function helps us prevent attacks such as SQL injection
$query = "DELETE FROM users WHERE id = ".$mysqli->real_escape_string($_GET['id'])."";
//execute query
if( $mysqli->query($query) ){
//if successful deletion
echo "User was deleted.";
}else{
//if there's a database problem
echo "Database Error: Unable to delete record.";
}
}
$query = "select * from users";
$result = $mysqli->query( $query );
$num_results = $result->num_rows;
echo "<div><a href="add.php">Create New Record</a></div>";
if( $num_results ){
echo "<table border="1">";
echo "<tr>";
echo "<th>Firstname</th>";
echo "<th>Lastname</th>";
echo "<th>Username</th>";
echo "<th>Action</th>";
echo "</tr>";
//loop to show each records
while( $row = $result->fetch_assoc() ){
extract($row);
echo "<tr>";
echo "<td>{$firstname}</td>";
echo "<td>{$lastname}</td>";
echo "<td>{$username}</td>";
echo "<td>";
echo "<a href="edit.php?id={$id}">Edit</a>";
echo " / ";
//on click of our delete link, a pop up will appear.
//it means it run our delete JavaScript
echo "<a href="#">Delete</a>";
echo "</td>";
echo "</tr>";
}
echo "</table>";
}else{
echo "No records found.";
}
$result->free();
$mysqli->close();
?>
<script type='text/javascript'>
function delete_user( id ){
//prompt the user
var answer = confirm('Are you sure?');
if ( answer ){ //if user clicked ok
//redirect to url with action as delete and id of the record to be deleted
window.location = 'delete.php?action=delete&id=' + id;
}
}
</script>
</body>
</html>
in my display.php
echo "<div><a href='add.php'>Create New Record</a></div>";
if( $num_results > 0){ //it means there's already a database record
echo "<table border='1'>";//start table
//creating our table heading
echo "<tr>";
echo "<th>Firstname</th>";
echo "<th>Lastname</th>";
echo "<th>Username</th>";
echo "<th>Action</th>";
echo "</tr>";
//loop to show each records
while( $row = $result->fetch_assoc() ){
//extract row
//this will make $row['firstname'] to
//just $firstname only
extract($row);
//creating new table row per record
echo "<tr>";
echo "<td>{$firstname}</td>";
echo "<td>{$lastname}</td>";
echo "<td>{$username}</td>";
echo "<td>";
//just preparing the edit link to edit the record
echo "<a href='edit.php?id={$id}'>Edit</a>";
echo " / ";
//just preparing the delete link to delete the record
echo "<a href='delete.php' >Delete</a>";
echo "</td>";
echo "</tr>";
}
echo "</table>";//end table
}else{
//if database table is empty
echo "No records found.";
} 解决方案
query = "DELETE FROM users WHERE id = ".
mysqli->real_escape_string(
_GET['id']).""; "
<html> <head> <title>MySQLi Delete Record</title> </head> <body> //include database connection include 'db_connect.php';
这篇关于嗨伙计们，我有一个错误“Undefined index：id”任何人都可以帮助我。谢谢的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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