这个问题在这里已经有答案了:
mysql\u fetch\u array()/mysql\u fetch\u assoc()/mysql\u fetch\u row()/mysql\u num\u rows等…期望参数1是资源(31个答案)
mysqli_fetch_assoc()需要参数/调用成员函数bind_param()时出错。如何获得实际的mysql错误并修复它(1个答案)
两年前关门了。
这是我的php代码
<?php
if (isset($_POST['search'])) {
require 'config.php';
$department = $_POST['department'];
$class = $_POST['class'];
$i = 1;
$query = "SELECT `student_id` , `name`, `htno`, `department`, `class` FROM student_detail where department=$department && class=&class";
$result = mysqli_query($conn, $query);
while ($row = mysqli_fetch_array($result)) {
echo "<tr>";
echo "<td>" . $i++ . "</td>";
echo "<td>" . $row['name'] . "</td>";
echo "<td>" . $row['htno'] . "</td>";
echo "<td>" . $row['department'] . "</td>";
echo "<td>" . $row['class'] . "</td>";
echo "<td><a href=\"delete.php?class_id=" . $row['student_id'] . "\" onClick=\"return confirm('Are you sure you want to delete?')\">DELETE</a></td></tr>";
}
}
?>
错误是
警告:mysqli\u fetch\u array()要求参数1为mysqli\u result,布尔值`
当我使用这个代码是我做错了什么请帮助我。。我是php初学者。我无法选择数据库。
选择数据时,错误可能在部门和类中。
<form method="post" action="" >
<div class="form-group">
<label for="department">Department</label>
<select name="department" class="form-control">
<option selected="selected">Please select your department</option>
<?php
require('config.php');
$result = mysqli_query($conn, "SELECT * FROM department");
while ($test = mysqli_fetch_array($result)) {
echo "<option
value='" . $test['department_name'] . "'>" . $test['department_name'] . "</option>";
}
?>
</select>
</div>
<div class="form-group ">
<label for="class">Class</label>
<select name="class" class="form-control">
<option selected="selected">Please select your class</option>
<?php
require('config.php');
$result = mysqli_query($conn, "SELECT * FROM class");
while ($test = mysqli_fetch_array($result)) {
echo "<option value='" . $test['class_name'] . "'>" . $test['class_name'] . "
</option>";
}
?>
</select>
</div>
<button type="submit" name="search" class="btn btn-
primary">Submit</button>
</form>
1条答案
按热度按时间uxhixvfz1#
试试这个方法。这将在查询中使用准备好的语句。
以下是有关mysqli准备好的语句的链接:
https://websitebeaver.com/prepared-statements-in-php-mysqli-to-prevent-sql-injection