我修改了此tutoriel https://www.killersites.com/community/index.php?/topic/3064-basic-php-system-view-edit-add-delete-records-with-mysqli/，以打印5个主列：ID，名字，姓氏，位置和＆amp;衬衫＃以及其他2个用于编辑和删除按钮的列。编辑代码后，表格已启动，但在编辑或录制新条目时，我的新条目不会保存到我的数据库中。这是代码，请看看，帮我找出问题所在。代码没有正确格式化，所以我把它放在github这里https://github.com/godgive/CS50/blob/master/records.php并尝试使其可读。
编辑：
为什么在尝试通过浏览器编辑或添加新记录时，数据不会保存到MySQL数据库中以便在刷新后显示？
<?php
/*
Allows the user to both create new records and edit existing records
*/
// connect to the database
include("connect-db.php");
// creates the new/edit record form
// since this form is used multiple times in this file, I have made it a function that is easily reusable
function renderForm($first = '', $last ='', $pos = '', $shirt = '', $error = '', $id = '')
{ ?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>
<?php if ($id != '') { echo "Edit Record"; } else { echo "New Record"; } ?>
</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
</head>
<body>
<h1><?php if ($id != '') { echo "Edit Record"; } else { echo "New Record"; } ?></h1>
<?php if ($error != '') {
echo "<div style='padding:4px; border:1px solid red; color:red'>" . $error
. "</div>";
} ?>
<form action="" method="post">
<div>
<?php if ($id != '') { ?>
<input type="hidden" name="id" value="<?php echo $id; ?>" />
<p>ID: <?php echo $id; ?></p>
<?php
} ?>
<strong>First Name: *</strong> <input type="text" name="firstname"
value="<?php echo $first; ?>"/><br/>
<strong>Last Name: *</strong> <input type="text" name="lastname"
value="<?php echo $last; ?>"/><br/>
<strong>Position: </strong> <input type="text" name="position"
value="<?php echo $pos; ?>"/><br/r>
<strong>Shirt #: </strong> <input type="number" name="shirt"
value="<?php echo $shirt; ?>"/>
<p>* required</p>
<input type="submit" name="submit" value="Submit" />
</div>
</form>
</body>
</html>
<?php }
/*
EDIT RECORD
*/
// if the 'id' variable is set in the URL, we know that we need to edit a record
if (isset($_GET['id']))
{
// if the form's submit button is clicked, we need to process the form
if (isset($_POST['submit']))
{
// make sure the 'id' in the URL is valid
if (is_numeric($_POST['id']))
{
// get variables from the URL/form
$id = $_POST['id'];
$firstname = htmlentities($_POST['firstname'], ENT_QUOTES);
$lastname = htmlentities($_POST['lastname'], ENT_QUOTES);
$position = htmlentities($_POST['position'], ENT_QUOTES);
$shirt = htmlentities($_POST['shirt'], ENT_QUOTES);
// check that firstname and lastname are both not empty
if ($firstname == '' || $lastname == '')
{
// if they are empty, show an error message and display the form
$error = 'ERROR: Please fill in all required fields!';
renderForm($firstname, $lastname, $pos, $shirt, $error, $id);
}
else
{
// if everything is fine, update the record in the database
if ($stmt = $mysqli->prepare("UPDATE players SET firstname = ?, lastname = ?,
position = ?, shirt = ?
WHERE id=?"))
{
$stmt->bind_param("ssi", $firstname, $lastname, $position, $shirt, $id);
$stmt->execute();
$stmt->close();
}
// show an error message if the query has an error
else
{
echo "ERROR: could not prepare SQL statement.";
}
// redirect the user once the form is updated
header("Location: view.php");
}
}
// if the 'id' variable is not valid, show an error message
else
{
echo "Error!";
}
}
// if the form hasn't been submitted yet, get the info from the database and show the form
else
{
// make sure the 'id' value is valid
if (is_numeric($_GET['id']) && $_GET['id'] > 0)
{
// get 'id' from URL
$id = $_GET['id'];
// get the recod from the database
if($stmt = $mysqli->prepare("SELECT * FROM players WHERE id=?"))
{
$stmt->bind_param("i", $id);
$stmt->execute();
$stmt->bind_result($id, $firstname, $lastname, $position, $shirt);
$stmt->fetch();
// show the form
renderForm($firstname, $lastname, $position, $shirt, NULL, $id);
$stmt->close();
}
// show an error if the query has an error
else
{
echo "Error: could not prepare SQL statement";
}
}
// if the 'id' value is not valid, redirect the user back to the view.php page
else
{
header("Location: view.php");
}
}
}
/*
NEW RECORD
*/
// if the 'id' variable is not set in the URL, we must be creating a new record
else
{
// if the form's submit button is clicked, we need to process the form
if (isset($_POST['submit']))
{
// get the form data
$firstname = htmlentities($_POST['firstname'], ENT_QUOTES);
$lastname = htmlentities($_POST['lastname'], ENT_QUOTES);
$position = htmlentities($_POST['position'], ENT_QUOTES);
$shirt = htmlentities($_POST['shirt'], ENT_QUOTES);
// check that firstname and lastname are both not empty
if ($firstname == '' || $lastname == '')
{
// if they are empty, show an error message and display the form
$error = 'ERROR: Please fill in all required fields!';
renderForm($firstname, $lastname, $pos, $shirt, $error);
}
else
{
// insert the new record into the database
if ($stmt = $mysqli->prepare("INSERT players (firstname, lastname, position, shirt) VALUES (?, ?, ?, ?)"))
{
$stmt->bind_param("ss", $firstname, $lastname, $position, $shirt);
$stmt->execute();
$stmt->close();
}
// show an error if the query has an error
else
{
echo "ERROR: Could not prepare SQL statement.";
}
// redirec the user
header("Location: view.php");
}
}
// if the form hasn't been submitted yet, show the form
else
{
renderForm();
}
}
// close the mysqli connection
$mysqli->close();
?>
答案 0 :(得分：0)
再次仔细查看代码之后，我改变了
MyDF.rdd.map(MyFunction)
进入
else
{
// if everything is fine, update the record in the database
if ($stmt = $mysqli->prepare("UPDATE players SET firstname = ?, lastname = ?,
position = ?, shirt = ?
WHERE id=?"))
{
$stmt->bind_param("ssi", $firstname, $lastname, $position, $shirt, $id);
然后
else
{
// if everything is fine, update the record in the database
if ($stmt = $mysqli->prepare("UPDATE players SET firstname = ?, lastname = ?,
position = ?, shirt = ?
WHERE id=?"))
{
/// added two more s here
$stmt->bind_param("ssssi", $firstname, $lastname, $position, $shirt, $id);
进入
// insert the new record into the database
if ($stmt = $mysqli->prepare("INSERT players (firstname, lastname, position, shirt) VALUES (?, ?, ?, ?)"))
{
$stmt->bind_param("ss", $firstname, $lastname, $position, $shirt);
$stmt->execute();
$stmt->close();
}
现在它按预期工作了。 这是我第一次使用php和MySQL，所以纠正我，如果那些'不应该被称为占位符。