在尝试调试这段代码数小时后，我发现我不明白为什么我的编辑表单在我的一生中都不会更新。我不确定是因为我没有正确使用GET或POST方法，还是错误地使用了mysql，或者两者的组合。我甚至不明白为什么一行字是"嗨"；不会出现。如果我在点击编辑提交按钮时取出代码测试行，打印行就会出来，但我的数据库不会更新。所以我觉得我陷入了无法再进行打印行调试的境地，直到我弄清楚自己做错了什么。这是我的密码。。我在没有显示的"打印"嗨；"行旁边评论道。请记住，我确信我尝试了GET和POST的每一种组合，但仍然没有出现。。。
<html lang="en">
<head>
<title>Employee</title>
</head>
<body>
<a href="employ.php">Clean</a> <br>
<form method="post" action="employ.php">
<input type="text" name="fname">First Name<br>
<input type="text" name="lname">Last Name<br>
<input type="text" name="email">email<br>
<input type="text" name="zip">zip code<br>
<input type="submit" name="add" value="Add"> <!-- button itself -->
</form>
<br>
<?php //server login name password database
$link = mysqli_connect("server", "login", "password", "database") or die(mysqli_error());
if(isset($_POST['add'])) //this processes after user submits data.
{
$fname = $_POST['fname'];
$lname = $_POST['lname'];
$email = $_POST['email'];
$zip = $_POST['zip'];
$re = "/^[a-zA-Z]+((['''- ][a-zA-Z])?[a-zA-Z]*)*$/";
$reEmail = "/^'w+(['.-]?'w+)*@'w+(['.-]?'w+)*('.'w{2,4})+$/";
$reZip = "/^'d{5}$/";
//if user passes re test
if( preg_match($re, $fname) && preg_match($re, $lname)
&& preg_match($reEmail, $email) && preg_match($reZip, $zip) )
{ //display current table
$querycheck = "select * from employees where fname='$fname' and email='$email'";
$resultcheck = mysqli_query($link, $querycheck); //link query to database
if(mysqli_num_rows($resultcheck) == 0)// test if query does "nothing"
{//if not process the insert query
$query = "insert into employees values('', '$fname', '$lname', '$email', '$zip')";
mysqli_query($link, $query); //link query to database
print "Employee Added"; // print confirmation
}
else
{
print "That record already exists!";
}
}
else
{
print "You did not fill out the form correctly!";
}
} ////////////////////////////////edit portion/////////////////////////////
if(isset($_GET['edit']))
{
print "teseting edit<br><br>";
?>
<form method="get" action="employ.php">
<input type="text" name="fname" value = "<?php echo $_GET['fname']?>">First Name<br>
<input type="text" name="lname" value = "<?php echo $_GET['lname']?>">Last Name<br>
<input type="text" name="email" value = "<?php echo $_GET['email']?>">email<br>
<input type="text" name="zip" value = "<?php echo $_GET['zip']?>">zip code<br>
<input type="hidden" name="employeeid" value = "<?php echo $_GET['employeeid']?>">
<input type="submit" name="endedit" value="Edit"> <!-- button itself -->
</form>
<?php
print "teseting end edit <br><br>";
if(isset($_POST['endedit'])) //this processes after user submits edited data
{ //tried get and post
print "hi"; // DOESNT APPEAR
$fname = $_POST['fname'];
$lname = $_POST['lname'];
$email = $_POST['email'];
$zip = $_POST['zip'];
$employeeidtemp = $_POST['employeeid'];
$re = "/^[a-zA-Z]+((['''- ][a-zA-Z])?[a-zA-Z]*)*$/";
$reEmail = "/^'w+(['.-]?'w+)*@'w+(['.-]?'w+)*('.'w{2,4})+$/";
$reZip = "/^'d{5}$/";
//if user passes re test
if( preg_match($re, $fname) && preg_match($re, $lname)
&& preg_match($reEmail, $email) && preg_match($reZip, $zip) )
{ //display current table
//$querycheck = "select * from employees where employeeid='$employeeidtemp'";
//$resultcheck = mysqli_query($link, $querycheck); //link query to database
// if(mysqli_num_rows($resultcheck) == 0)// test if query does "nothing"
// {
$query = "UPDATE employees SET fname='$fname', lname='$lname', email='$email', zip='$zip' WHERE employeeid='$employeeidtemp'";
mysqli_query($link, $query); //link query to database
print "Employee Updated"; // print confirmation
// }
// else
// print "huh?";
}
else
{
print "You did not fill out the form correctly!";
}
}
}
if(isset($_GET['delete']))
{
print "teseting delete<br><br>";
}
showemp();
function showemp()
{
global $link;
if(isset($_GET['choice']))
{
$choice = $_GET['choice'];
}
else
{
$choice = "lname";
}
$query = "select * from employees order by $choice";
$result = mysqli_query($link, $query);
// print table (happens first before input)
// first print row of links/headers that sort
print "<table border='1'>
<tr>
<th>Edit</th>
<th>Delete</th>
<th><a href='employ.php?choice=fname'>FNAME</a></th>
<th><a href='employ.php?choice=lname'>LNAME</a></th>
<th><a href='employ.php?choice=email'>EMAIL</a></th>
<th><a href='employ.php?choice=zip'>ZIP</a></th>
</tr>";
//while the next row (set by query) exists?
while($row = mysqli_fetch_row($result))
{
list($employeeid, $fname, $lname, $email, $zip) = $row;
print "<tr>
<td><a href='employ.php?edit=yes&employeeid=$employeeid&fname=$fname&lname=$lname&email=$email&zip=$zip'>Edit</a></td>
<td><a href='employ.php?delete=yes&employeeid=$employeeid
onclick='return confirm('"Are you sure'")'>Delete</a></td>
<td>$fname</td>
<td>$lname</td>
<td>$email</td>
<td>$zip</td>
</tr>";
}
print "</table>";
}
?>
</body>
</html>
您有几个错误：
- 您不检查查询结果，请至少使用编码mysqli_query（$link，$query）或die（mysqli_error（$link））
当我用检查错误来处理您的代码时，我发现添加查询不起作用——我的整数字段不接受employeeid的空字符串值。
- 不要在表单中使用GET。始终POST。如果您需要对GET url做出反应，请单独编写或使用$_REQUEST变量
- 在INSERT查询中，始终写入字段。当您决定更改mysql表中的字段列表时，您可以获得此代码的奇怪行为
- 您的主要错误是，打印为"hi"的条件在if（isset（$_GET['edit']）条件内，当用户升华表单时，它不起作用