[英]Data could not be inserted into mysql table with foreign key
我正在嘗試使用外鍵將數據插入到子表中。 不會插入數據,也不會顯示錯誤。 一旦我刪除了子表中帶有外鍵的列,就會執行查詢並插入數據。
我試圖調試這個,使用 error_reporting E_ALL,我得到的只是 2257,我不明白這意味着什么。
這是插入查詢的代碼
if(isset($_POST['submenu'])){
$page = mysqli_real_escape_string($con, strtolower($_POST['page']));
$parents_name = mysqli_real_escape_string($con, strtolower($_POST['menu_id']));
$UniqueMenuID = '';
if( isset( $_POST['menus_id'])) {
$UniqueMenuID = $_POST['menus_id'];
}
$sub_query = '';
if(empty($page) AND ($parents_name)){
$sub_error = "<span class='animated flash'>Select a Page to Add to Menu!</span>";
}
else if(empty($page)){
$sub_error = "<span class='animated flash'>Select a Page to Add to Menu!</span>";
}
else if(empty($parents_name)){
$sub_error = "<span class='animated flash'>Select a Parent to Add Sub Menu!</span>";
}
else{
$check_query = "SELECT * FROM menu_items WHERE title = '$page'";
$check_run = mysqli_query($con, $check_query);
if(mysqli_num_rows($check_run) > 0){
$sub_error = "<span class='animated flash'>Sub Menu Already Exist!</span>";
}
else{
$sub_query = "INSERT INTO `sub_menu`(`sub_id`, `sub_title`, `parent`, `menus_id`) VALUES ('NULL', '$page', '$parents_name', '$UniqueMenuID')";
if(mysqli_query($con, $sub_query)){
$sub_msg = "Sub Menu Has Been Added";
}
else{
$sub_error = "Sub Menu Has Not Been Added";
}
}
}
}
AND THE DATABASE FOR THE PARENT
CREATE TABLE `menu_items` (
`id` int(11) NOT NULL,
`title` varchar(255) NOT NULL,
`page` varchar(255) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
--
-- Dumping data for table `menu_items`
--
INSERT INTO `menu_items` (`id`, `title`, `page`) VALUES
(52, 'promotions', 'promotions'),
(58, 'products', 'products');
--
-- Indexes for dumped tables
--
--
-- Indexes for table `menu_items`
--
ALTER TABLE `menu_items`
ADD PRIMARY KEY (`id`),
ADD KEY `id` (`id`);
--
-- AUTO_INCREMENT for dumped tables
--
--
-- AUTO_INCREMENT for table `menu_items`
--
ALTER TABLE `menu_items`
MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=59;
COMMIT;
和兒童表的數據庫
CREATE TABLE `sub_menu` (
`sub_id` int(11) NOT NULL,
`sub_title` varchar(255) NOT NULL,
`parent` varchar(255) NOT NULL,
`menus_id` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
--
-- Indexes for dumped tables
--
--
-- Indexes for table `sub_menu`
--
ALTER TABLE `sub_menu`
ADD PRIMARY KEY (`sub_id`),
ADD KEY `menus_id` (`menus_id`);
--
-- AUTO_INCREMENT for dumped tables
--
--
-- AUTO_INCREMENT for table `sub_menu`
--
ALTER TABLE `sub_menu`
MODIFY `sub_id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=31;
--
-- Constraints for dumped tables
--
--
-- Constraints for table `sub_menu`
--
ALTER TABLE `sub_menu`
ADD CONSTRAINT `Foreign key to menu id` FOREIGN KEY (`menus_id`) REFERENCES `menu_items` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;
COMMIT;
需要將數據插入到外鍵不變的表中。
您檢查空的 $page 但沒有 $parents_name:
if(empty($page) AND ($parents_name)) {
那么當第四個 else 條件開始時呢?
if(empty($page) AND ($parents_name)) {
} else if(empty($page)) {
} else if(empty($parents_name)) {
} else {
// When this condition starts?
}
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