Php 为什么我的mySQL表数据不回显?
我试图将多个表中的数据打印到一个html表中,但我似乎不明白为什么只显示表标题Php 为什么我的mySQL表数据不回显?,php,jquery,mysql,Php,Jquery,Mysql,我试图将多个表中的数据打印到一个html表中,但我似乎不明白为什么只显示表标题 <?php include('includes/db_connect.php'); $query_student="SELECT student.firstName, student.lastName, major.major, major.gradDate, FROM student JOIN major O
<?php
include('includes/db_connect.php');
$query_student="SELECT student.firstName, student.lastName, major.major, major.gradDate,
FROM student
JOIN major
ON student.studentID=major.studentID";
$result_student=mysqli_query($conn, $query_student);
echo '<table>
<tr>
<th>First Name</th>
<th>Last Name</th>
<th>Graduate Year</th>
<th>Major</th>
<th>Activity After Graduation</th>
</tr>';
while($row = mysqli_fetch_array($result_student))
{
echo'<tr>'; // printing table row
echo '<td>' . $row['firstName'] . '</td>';
echo '<td>' . $row['lastName'] . '</td>';
echo '<td>' . $row['gradDate'] . '</td>';
echo '<td>' . $row['major'] . '</td>';
echo'</tr>'; // closing table row
}
echo '</table>';
$conn->close();
?>
首先从查询中删除major.gradDate之后的字段,因为后面没有其他字段
您真的应该检查查询中的错误,以了解发生了什么
更改:$result\u student=mysqli\u query$conn,$query\u student
致:
$result\u student=mysqli\u query$conn,$query\u student或die mysqli\u error$conn 您可以使用foreach语句和mysqli对象的查询方法来实现这一点 我还修复了您的SQL,在将两个表添加到一起时需要左连接。请首先检查此SQL语句是否在环境中工作,因为它尚未测试
$query_student="SELECT t1.firstName, t1.lastName, t2.major, t2.gradDate
FROM student t1
LEFT JOIN SECOND_TABLE t2
ON t1.studentID = t2.studentID";
// Replace SECOND_TABLE with your table name you're joining on
?> <tr>
<?php
if($conn):
foreach ($conn->query($query_student) as $row): ?>
<!-- conditional statements allow HTML inside PHP loops -->
<td> <?php echo $row['firstName']; ?> </td>
// [...]
<?php endforeach;
else:
die('Connection Error: ' . $conn->error);
endif; ?>
</tr>
希望这有帮助。您是否在另一个环境(如phpMyAdmin)中运行查询以查看它是否返回结果?运行查询后添加错误检查