答案 0 :(得分:0)
从屏幕截图中我了解到,您不想在同一部门的同一部门分配多位讲师。
因此,在创建allocated
行之前,您需要检查那些条目是否已经存在。
$data = compact('course_id', 'department', 'unit');
// check the department and unit already assigned or not.
if(!allocated::where($data)->exists()){
$data['lecturers_name'] = $lecturers_name;
allocated::create($data);
}
答案 1 :(得分:-1)
对于初学者,您没有提供任何代码示例。因此,我以后的示例将不会基于您的代码。
您可以禁用一个复选框,但是如果有人真的愿意,可以很容易地忽略它。检查器可用于更改html,以便禁用复选框被启用。当然,您可以在后端对此进行验证。
我将选择仅显示其值尚未被其他人选中的复选框。我的示例包含两种解决方案。
// create connection with your database.
$conn = new mysqli($servername, $username, $password, $dbname);
// array with values that can be picked.
$values = ['Apple', 'Banana', 'Lemon'];
// loop trough the array.
foreach( $values as $fruit )
{
// select query -> check if someone else already choose the fruit.
$sql = "SELECT chosen_fruit FROM friends WHERE chosen_fruit = " . $fruit;
// execute the query.
$result = $conn->query($sql);
// if no results are found, meaning nobody else have picked this fruit yet.
if ($result->num_rows == 0) {
// enabled checkbox that is free to use
echo '<input type="checkbox" name="chosen_fruit" value="' . $fruit . '">'
} else {
// disabled checkbox because this fruit has already been chosen.
echo '<input type="checkbox" name="chosen_fruit" value="' . $fruit . '" disabled>'
}
}
编辑:发布答案后,我看到了您的编辑。