我有一个登录页面，当用户成功登录时，它会被带到欢迎页面，然后他可以点击预订活动。当用户点击预订活动时，会显示日历，其中包含可以预订的所有活动。当用户单击以预订某些活动时，应使用应从登录页面和activityEventID获取的clientID更新clientEvent表。但是我得到一个错误：无法添加或更新子行：外键约束失败（fitnessconnect。clientevent，CONSTRAINT clientevent_ibfk_1 FOREIGN KEY（activityEventID）REFERENCES {{ 1}}（activityevent））
如果我没有从登录页面或其他内容中正确获取clientID，我不确定我在哪里犯了错误。
此外，我还不确定如何传递activityEventID a href =＆＃39; CreateNewActivityBooking.php？activityEventID = activityEventID＆＃39; 我用过这个，但我不确定它是否正确
要创建两个表，我使用了这个
activityEventID这是login.html
create table activityEvent
(
activityEventID integer auto_increment,
date date,
title varchar(30),
description varchar(50),
price integer,
location varchar(30),
startTime time,
endTime time,
activityTitle varchar(30),
noOfPlaces integer,
restricted varchar(30),
personalTrainer_CoachID integer,
primary key (activityEventID),
foreign key (personalTrainer_CoachID) references personalTrainer_Coach(personalTrainer_CoachID)
);
create table clientEvent
(
clientEventID integer auto_increment,
activityEventID integer,
clientID integer,
primary key (clientEventID),
foreign key (activityEventID) references activityEvent(activityEventID),
foreign key (clientID) references client(clientID)
);
的login.php
<HTML>
<BODY>
<FORM action='login.php' method = 'POST'>
<label>Enter your username</label>
<input name="username" type="text"/>
<br/>
<label>Enter your password</label>
<input name="password" type="password"/>
<br/>
<input type="submit"/>
</FORM>
</BODY>
</HTML>
welcome.html这只是一个没有太多功能的开始
<?php
session_start();
$userName = $_POST['username'];
$passWord = $_POST['password'];
require('connection.php');
$dbpwd="";
$con=mysqli_connect($mysql_host,$mysql_user,$mysql_password,$mysql_database);
$sql ="select clientID, password from client where userName = '$userName'";
$result = mysqli_query($con,$sql);
while($row = $result->fetch_assoc())
{
$dbpwd =$row['password'];
$clientID =$_SESSION['clientID'];
$_SESSION['clientID']='$clientID';
}
if($dbpwd == $passWord)
{
header("Location: welcome.html");
}
else
{
echo"Passwords do not match";
echo"</br>";
echo"Please Try Again";
}
?>
calenderTest2.php
<html>
<head>
<title> Welcome </title>
</head>
<body>
<h1>Welcome!</h1>
<button onClick="window.location='calendarTest2.php';" > Book Activity</button>
</body>
</html>
BookingsDB.php
<?php
$monthNames = Array("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
?>
<?php
if (!isset($_REQUEST["month"]))
$_REQUEST["month"] = date("n");
if (!isset($_REQUEST["year"]))
$_REQUEST["year"] = date("Y");
?>
<?php
$cMonth = $_REQUEST["month"];
$cYear = $_REQUEST["year"];
$prev_year = $cYear;
$next_year = $cYear;
$prev_month = $cMonth-1;
$next_month = $cMonth+1;
if ($prev_month == 0 )
{
$prev_month = 12;
$prev_year = $cYear - 1;
}
if ($next_month == 13 )
{
$next_month = 1;
$next_year = $cYear + 1;
}
require("BookingsDB.php");
$myBookingsDB = new BookingsDB();
$bookings = $myBookingsDB->getMonthlyBookings($cMonth,$cYear);
?>
<div align="left">
<table width="400" border="5" align="left" id="calendar">
<tr align="center">
<td bgcolor="#999999" style="color:#FFFFFF"><table width="100%" border="0"
cellspacing="0" cellpadding="0">
<tr>
<td width="50%" align="left"><a href="<?php echo $_SERVER["PHP_SELF"]
. "?month=". $prev_month . "&year=" . $prev_year; ?>"
style="color:#FFFFFF">Previous</a></td>
<td width="50%" align="right"><a href="<?php echo $_SERVER["PHP_SELF"]
. "?month=". $next_month . "&year=" . $next_year; ?>"
style="color:#FFFFFF">Next</a></td>
</tr>
</table></td>
</tr>
<tr>
<td align="center"><table width="100%" border="2" cellpadding="2"
cellspacing="2">
<tr align="center">
<td colspan="7" bgcolor="#999999" style="color:#FFFFFF"><strong> <?php
echo $monthNames[$cMonth-1].' '.$cYear; ?></strong></td>
</tr>
<tr>
<td align="center" bgcolor="#999999" style="color:#FFFFFF">
<strong>S</strong></td>
<td align="center" bgcolor="#999999" style="color:#FFFFFF">
<strong>M</strong></td>
<td align="center" bgcolor="#999999" style="color:#FFFFFF">
<strong>T</strong></td>
<td align="center" bgcolor="#999999" style="color:#FFFFFF">
<strong>W</strong></td>
<td align="center" bgcolor="#999999" style="color:#FFFFFF">
<strong>T</strong></td>
<td align="center" bgcolor="#999999" style="color:#FFFFFF">
<strong>F</strong></td>
<td align="center" bgcolor="#999999" style="color:#FFFFFF">
<strong>S</strong></td>
</tr>
<?php
require("connection.php");
$con=mysqli_connect("$mysql_host","$mysql_user","$mysql_password","$mysql_database");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$timestamp = mktime(0,0,0,$cMonth,1,$cYear);
$maxday = date("t",$timestamp);
$thismonth = getdate ($timestamp);
$startday = $thismonth['wday'];
$today = getdate();
for ($i=0; $i<($maxday+$startday); $i++)
{
if(($i % 7) == 0 )
{
echo "<tr> ";
}
if($i < $startday)
{
echo "<td></td> ";
}
else
{
$day = $i - $startday + 1;
$thisDate = new DateTime("$cYear-$cMonth-$day");
$jsEvent[] = "document.getElementById('trigger" . $i . "').onclick = function() {showForm()};";
echo "<td align='center' valign='middle' height='20px'><a href='CreateNewActivityBooking.php?activityEventID=activityEventID' id='trigger" . $i . "'>". ($i - $startday + 1) . "</a>";
foreach ($bookings as $key => $value)
{
if ($thisDate->format('Y-m-d') == $value['date']->format('Y-m-d'))
{
echo " ";
echo $value['title'];
echo " ";
echo $value['startTime'];
}
}
echo "</td>";
}
if(($i % 7) == 6 )
{
echo "</tr> ";
}
}
mysqli_close($con);
?>
<script type="text/javascript">
<?php foreach($jsEvent as $event)
{
echo $event;
}
?>
function showForm()
{
document.getElementById('timeslots').style.display="block";
};
</script>
</table></td>
</tr>
</table>
CreateNewActivityBooking.php
<?php
session_start();
class BookingsDB
{
private $bookings = array();
private $con;
public function BookingsDB()
{
require("connection.php");
$this->con = mysqli_connect($mysql_host,$mysql_user,$mysql_password,$mysql_database);
}
public function getMonthlyBookings($thisMonth,$thisYear)
{
$sql = "SELECT activityEventID,date,title,startTime FROM activityEvent WHERE YEAR(date) = $thisYear AND MONTH(date) = $thisMonth";
$result = mysqli_query($this->con,$sql);
while($row=mysqli_fetch_array($result))
{
$this->bookings[] = array('date'=>new DateTime($row['date']), 'title'=>$row['title'],'startTime'=>$row['startTime']);
//$activityEventID =$_SESSION['activityEventID'];
//$_SESSION['activityEventID']='activityEventID';
}
return $this->bookings;
}
public function close()
{
mysqli_close($this->con);
}
}
?>
答案 0 :(得分：0)
通过查看代码，您似乎没有将activityEventID存储在会话变量中。并且您正在尝试在CreateNewActivityBooking.php页面上访问它，同时将事件插入“clientEvent”表。
查看代码中的以下行：
$clientID=$_SESSION['clientID'];
$activityEventID =$_SESSION['activityEventID']; //Here $_SESSION['activityEventID'] doesn't exists
由于“clientEvent”表具有“activityEventID”列的外键约束。由于此约束将失败，因此不会执行查询并且您收到错误。
所以基本上你需要找到一种在那里传递正确值的方法。
编辑：至于您的评论，您发布的脚本似乎并未在会话中存储“activityEventID”，因为您引用的行实际上是对您发布的脚本进行了评论。
具体到这里你需要做什么。
On BookingsDB.php
$this->bookings[] = array('date'=>new DateTime($row['date']), 'title'=>$row['title'],'startTime'=>$row['startTime'], 'activityEventID'=>$row['activityEventID']);
在你的calenderTest2.php
上echo "<td align='center' valign='middle' height='20px'>";
foreach ($bookings as $key => $value)
{
if ($thisDate->format('Y-m-d') == $value['date']->format('Y-m-d'))
{
echo "<a href='CreateNewActivityBooking.php?activityEventID=".$value['activityEventId']."' id='trigger" . $i . "'>". ($i - $startday + 1) . "</a>";
echo " ";
echo $value['title'];
echo " ";
echo $value['startTime'];
}
}
echo '</td>';
现在，您要在每个链接的查询字符串中传递activityEventID。您可以在CreateNewActivityBooking.php中检索此内容，如下所示：
$activityEventID =$_GET['activityEventID'];
您可能需要在布局方面重新格式化一些内容，但我认为这是应该如何完成的。