尝试在数据库表中添加，更新和删除。但使用此代码我能够添加和删除表，但表不更新，需要查找错误。
使用表单发布数据和表格以显示用户的类别。即使没有更新数据库表，update命令也没有显示结果。
<?php
require_once $_SERVER['DOCUMENT_ROOT'].'/thelewala/core/init.php';
include 'includes/head.php';
include 'includes/navigation.php';
$sql = "SELECT * FROM categories WHERE parent = 0";
$result = $db->query($sql);
$errors = array();
$category = '';
$post_parent = '';
// Edit Categories
if(isset($_GET['edit']) && !empty($_GET['edit'])){
$edit_id = (int)$_GET['edit'];
$edit_id = sanitize($edit_id);
$edit_sql = "SELECT * FROM categories WHERE id = '$edit_id'";
$edit_result = $db->query($edit_sql);
$edit_category = mysqli_fetch_assoc($edit_result);
}
// delete $category
if(isset($_GET['delete']) && !empty($_GET['delete'])){
$delete_id = (int)$_GET['delete'];
$delete_id = sanitize($delete_id);
// this code is to delete parent category with their child category
$sql = "SELECT * FROM categories WHERE id = '$delete_id'";
$result = $db->query($sql);
$category = mysqli_fetch_assoc($result);
if($category['parent'] == 0){
$sql = "DELETE FROM categories WHERE parent ='$delete_id'";
$db->query($sql);
}
// otherwise this code will delete selected child category
$dsql = "DELETE FROM categories WHERE id = '$delete_id'";
$db->query($dsql);
header('Location: categories.php');
}
// Process form //
if(isset($_POST) && !empty($_POST)){
$post_parent = sanitize($_POST['parent']);
$category = sanitize($_POST['category']);
$sqlform = "SELECT * FROM categories WHERE category ='$category' AND parent = '$post_parent'";
if(isset($_GET['edit'])){
$id = $edit_category['id'];
$sqlform = "SELECT * FROM categories WHERE category ='$category' AND parent = '$post_parent' AND id != '$id'";
}
$fresult = $db->query($sqlform);
$count = mysqli_num_rows($fresult);
// if category is blank //
if($category == ''){
$errors[] .= 'The category cannot be blank.';
}
// if exists in database-->
if($count > 0){
$errors[] .=$category. ' already exits. Please choose anather one.';
}
// display errors and update database-->
if(!empty($errors)){
// display errors-->
$display = display_errors($errors); ?>
<script>
jQuery('document').ready(function(){
jQuery('#errors').html('<?=$display; ?>');
});
</script>
<?php
}else{
// update database-->
$updatesql = "INSERT INTO categories (category, parent) VALUES ('$category','$post_parent')";
if(isset($_GET['edit'])){
$updatesql = "UPDATE categories SET category = '$category' parent = '$post_parent' WHERE id = '$edit_id'";
}
$db->query($updatesql);
header('Location: categories.php');
}
}
$category_value = '';
$parent_value = 0;
if(isset($_GET['edit'])){
$category_value = $edit_category['category'];
$parent_value = $edit_category['parent'];
}else{
if(isset($_POST)){
$category_value = $category;
$parent_value = $post_parent;
}
}
?>
<h2 class="text-center">Categories</h2>
<!-- form to add catagories-->
<div class="row">
<div class="col-md-6">
<legend><?=((isset($_GET['edit']))?'Edit':'Add A');?> Catagory</legend>
<div id="errors"></div>
<form class="form" action="categories.php<?=((isset($_GET['edit']))?'?edit='.$edit_id:'');?>" method="post">
<div class="form-group">
<label for="parent">Parent</label>
<select class="form-group" name="parent" id="parent">
<option value="0"<?=(($parent_value ==0)?' selected="selected"':'');?>>Parent</option>
<?php while($parent = mysqli_fetch_assoc($result)): ?>
<option value="<?=$parent['id']; ?>"<?=(($parent_value == $parent['id'])?' selected="selected"':'');?>><?=$parent['category']; ?></option>
<?php endwhile; ?>
</select>
</div>
<div class="form-group">
<label for="category">Catagory</label>
<input type="text" class="form-control" id="category" name="category" value="<?=$category_value;?>">
<input type="submit" value="<?=((isset($_GET['edit']))?'Edit':'Add');?> Category" class="btn btn-success">
</div>
<div class="form-group">
</div>
</form>
</div>
<!--table for categories chart-->
<div class="col-md-6">
<table class="table table-sm table-bordered">
<thead>
<th>Catagory</th><th>Parent</th><th></th>
</thead>
<tbody>
<?php
$sql = "SELECT * FROM categories WHERE parent = 0";
$result = $db->query($sql);
while($parent = mysqli_fetch_assoc($result)):
$parent_id = (int)$parent['id'];
$sql2 = "SELECT * FROM categories WHERE parent = '$parent_id'";
$cresult = $db->query($sql2);
?>
<tr class="bg-primary">
<td><?=$parent['category'];?></td>
<td>Parent</td>
<td>
<a href="categories.php?edit=<?=$parent['id'];?>" class="btn btn-xs btn-secondary"><span class="glyphicon glyphicon-pencil"></span>Edit</a>
<a href="categories.php?delete=<?=$parent['id'];?>" class="btn btn-xs btn-danger"><span class="glyphicon glyphicon-remove-sign"></span>Delete</a>
</td>
</tr>
<?php while($child = mysqli_fetch_assoc($cresult)): ?>
<tr class="table-info">
<td><?=$child['category'];?></td>
<td><?=$parent['category'];?></td>
<td>
<a href="categories.php?edit=<?=$child['id'];?>" class="btn btn-xs btn-secondary"><span class="glyphicon glyphicon-pencil"></span>Edit</a>
<a href="categories.php?delete=<?=$child['id'];?>" class="btn btn-xs btn-danger"><span class="glyphicon glyphicon-remove-sign"></span>Delete</a>
</td>
</tr>
<?php endwhile; ?>
<?php endwhile; ?>
</tbody>
</table>
</div>
</div>
<?php
include 'includes/footer.php';
?>
答案 0 :(得分：1)
SQL查询中存在语法错误。
$updatesql = "UPDATE categories SET category = '$category', parent = '$post_parent' WHERE id = '$edit_id'";
您只需在'$ category'之后添加逗号。