我对 PHP/HTML/CSS 编程非常陌生，在下面附加的代码中，我尝试为网站创建管理面板的基本功能。
我想要做的是打印出表格及其所有行和列，并添加一个带有控件的附加列，这将允许我从数据库中删除所述行。最终我希望能够更改每个用户的名称、密码和管理员权限。
此外，我真的不知道如何让每个按钮保存一个将其连接到各自行的值。
也许由于我是一个经验不足的程序员，所以我的所有尝试要么失败，要么删除了最后一行(可能是因为它是 $email 变量名称下的最后一个值)。一位 friend 建议使用 JavaScript 或转移到不同的平台(Angular JS 是他的建议)来实现我的目标，但现在我真的想用 PHP 保持简单(如果这确实是这个词的话)和 CSS。
这是管理面板的外观图像:
这是我的表格生成器(或者是我设法得到的):
<?php
include "connection.php";
$sql = "SELECT * FROM users;";
$result = $conn->query($sql);
if ($result->num_rows > 0)
{
echo "<table class='sqltable'>
<tr class='sqltable'>
<th class='sqltable'>ID</th>
<th class='sqltable'>EMAIL</th>
<th class='sqltable'>NAME</th>
<th class='sqltable'>IS ADMIN</th>
<th class='sqltable'>PASSWORD</th>
<th class='sqltable'>CONTROLS</th>
</tr>";
// output data of each row
while($row = $result->fetch_assoc())
{
echo "<tr class='sqltable'>
<td class='sqlcell'>".$row["ID"]."</td>
<td class='sqlcell'>".$row["EMAIL"]."</td>
<td class='sqlcell'>".$row["FIRST_NAME"]." ".$row["MID_NAME"]." ".$row["LAST_NAME"]."</td>
<td class='sqlcell'>".$row["IS_ADMIN"]."</td>
<td class='sqlcell'>".$row["PASSWORD"]."</td>
<td class='sqlcell'>
<center>
<div style='border: 1px solid lightgray;' method='POST'>
<input type='hidden' name='ID' value='".$row['ID']." '/>
<input type='button' name='delete' value='DEL ".$row['ID']." '/>
</div>
</center>
</td>
</tr>";
}
echo "</table>";
}
else
{
echo "DATABASE IS EMPTY!";
}
$conn->close();
if (isset($_POST['delete']))
{ //if a delete request received
$id = $_POST['id']; //primary key of this row
/////// Connectivity /////////
$servername = "127.0.0.1";
$username = "root";
$password = "";
$db = "myDB";
// Create connection
$conn = new mysqli($servername, $username, $password, $db);
//check connection
if ($conn)
{
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
//compose sql statement
$stmt = mysqli_prepare($conn, "DELETE FROM users WHERE ID=?");
mysqli_stmt_bind_param($stmt,'i',$id); //now add the $id to the statement 'i' stands for integer
mysqli_stmt_execute($stmt);
mysqli_stmt_close($stmt);
mysqli_close($conn); //connection closed
}
?>
这就是我开始做的事情，我已经很确定我采取了错误的方法来做到这一点。
function delete()
{
$del = "DELETE FROM '".$table."' WHERE EMAIL='".$email."';";
$conn->query($del);
}
最佳答案
现在，当我实现您在问题中发布的代码时，我更改了一些内容以使其正常工作，所有小问题，我将在评论中将它们发布在这里并进行详细说明。
<?php
if (isset($_POST['delete'])) //first: test if any delete request, delete and then render the table
{ //if a delete request received
$id = $_POST['id']; //primary key of this row, where 'id' index must be case-sensitively equal to the hidden input name 'id'
/////// Connectivity /////////
$servername = "localhost";
$username = "root";
$password = "root";
$db = "user_delete";
// Create connection (procedural style)
$conn = mysqli_connect($servername, $username, $password, $db);
//check connection
if (!$conn) //if NOT connected
{
printf("Connect failed: %s\n", mysqli_connect_error()); //print error
exit(); //exit the program 'in this case you wouldn't see the table either'
}
//compose sql statement
$stmt = mysqli_prepare($conn, "DELETE FROM users WHERE ID=?"); //notice that sql statements are NOT case sensitive
mysqli_stmt_bind_param($stmt,'i',$id); //now add the $id to the statement 'i' stands for integer
mysqli_stmt_execute($stmt);
mysqli_stmt_close($stmt);
mysqli_close($conn); //connection closed, row deleted
}
include "connection.php";
$sql = "SELECT * FROM users;";
$result = $conn->query($sql);
if ($result->num_rows > 0)
{
echo "<table class='sqltable'>
<tr class='sqltable'>
<th class='sqltable'>ID</th>
<th class='sqltable'>EMAIL</th>
<th class='sqltable'>NAME</th>
<th class='sqltable'>IS ADMIN</th>
<th class='sqltable'>PASSWORD</th>
<th class='sqltable'>CONTROLS</th>
</tr>";
// output data of each row
while($row = $result->fetch_assoc())
{
echo "<tr class='sqltable'>";
echo "<td class='sqlcell'>".$row["id"]."</td>"; //php is case-sensitive so you should use $row['ID'] according to your scheme
echo "<td class='sqlcell'>".$row["email"]."</td>";//php is case-sensitive so you should use $row['EMAIL'] according to your scheme
echo "<td class='sqlcell'>".$row["name"]."</td>";//for simplicity, I made one field, change it according to your scheme
echo "<td class='sqlcell'>".$row["is_Admin"]."</td>";//php is case-sensitive so you should use $row['IS_ADMIN'] according to your scheme
echo "<td class='sqlcell'>".$row["password"]."</td>";//same as above
echo "<td class='sqlcell'>
<center>
<div style='border: 1px solid lightgray;'>";
echo "<form method='POST'>"; //must be added in a form with method=post
echo "<input type='hidden' name='id' value='".$row['id']." '/>"; //differntiate between input name `id` and mysql field name you have `ID`, input field name is the index you will fetch in line 4: $_POST['id']
echo "<input type='submit' name='delete' value='DEL ".$row['id']." '/>"; //type: submit, not button
echo "</form>
</div>
</center>
</td>
</tr>";
}
echo "</table>";
}
else
{
echo "DATABASE IS EMPTY!";
}
//all done
$conn->close();
?>
更新:现在这是相同的代码，全部采用 OOP 风格并重用连接:
<?php
include "connection.php";
if (isset($_POST['delete'])) //first: test if any delete request, delete and then render the table
{ //if a delete request received
$id = $_POST['id']; //primary key of this row, where 'id' index must be case-sensitivly equal to the hidden input name 'id'
//check connection
if (mysqli_connect_errno()) //if connection error existed
{
printf("Connect failed: %s\n", mysqli_connect_error()); //print error
exit(); //exit the program 'in this case you wouldn't see the table either'
}
//compose sql statement
$stmt = $conn->prepare("DELETE FROM users WHERE ID=?"); //notice that sql statements are NOT case sensitive
$stmt->bind_param('i',$id); //now add the $id to the statement 'i' stands for integer
$stmt->execute();
$stmt->close();
}
$sql = "SELECT * FROM users;";
$result = $conn->query($sql);
if ($result->num_rows > 0)
{
echo "<table class='sqltable'>
<tr class='sqltable'>
<th class='sqltable'>ID</th>
<th class='sqltable'>EMAIL</th>
<th class='sqltable'>NAME</th>
<th class='sqltable'>IS ADMIN</th>
<th class='sqltable'>PASSWORD</th>
<th class='sqltable'>CONTROLS</th>
</tr>";
// output data of each row
while($row = $result->fetch_assoc())
{
echo "<tr class='sqltable'>";
echo "<td class='sqlcell'>".$row["id"]."</td>"; //php is case-sensitive so you should use $row['ID'] according to your scheme
echo "<td class='sqlcell'>".$row["email"]."</td>";//php is case-sensitive so you should use $row['EMAIL'] according to your scheme
echo "<td class='sqlcell'>".$row["name"]."</td>";//for simplicity, I made one field, change it according to your scheme
echo "<td class='sqlcell'>".$row["is_Admin"]."</td>";//php is case-sensitive so you should use $row['IS_ADMIN'] according to your scheme
echo "<td class='sqlcell'>".$row["password"]."</td>";//same as above
echo "<td class='sqlcell'>
<center>
<div style='border: 1px solid lightgray;'>";
echo "<form method='POST'>"; //must be added in a form with method=post
echo "<input type='hidden' name='id' value='".$row['id']." '/>"; //differntiate between input name `id` and mysql field name you have `ID`, input field name is the index you will fetch in line 4: $_POST['id']
echo "<input type='submit' name='delete' value='DEL ".$row['id']." '/>"; //type: submit, not button
echo "</form>
</div>
</center>
</td>
</tr>";
}
echo "</table>";
}
else
{
echo "DATABASE IS EMPTY!";
}
//all done
$conn->close();
?>
提示:在现实世界中，永远不要将密码存储为纯文本，搜索并阅读更多 about hashing
关于php - 向通过 php/html 脚本生成的按钮添加功能，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54899548/