所以我尝试使用 Ajax 和 PHP 的复选框来过滤记录。我正在尝试使用 PDO 过滤记录,因为它是最安全的选择。我想知道为什么过滤系统仅在选中一个复选框而不是更多复选框时进行过滤。
这是我的代码:
if(isset($_POST['merk']))
{
// Pretty sure you have the following format 1,2,3,4 and not '1','2','3','4'
$merk = implode(',', $_POST['merk']);
if (preg_replace('/[^A-Za-z0-9\-]/', '', $merk)) {
// Notice that placeholders should not be quoted
$sql .= ' AND merk IN(:merk)';
}
}
if(isset($_POST['brandstof']))
{
$brandstof = implode(',', $_POST['brandstof']);
if (preg_replace('/[^A-Za-z0-9\-]/', '', $brandstof)) {
$sql .= ' AND brandstof IN(:brandstof)';
}
}
if(isset($_POST['carrosserie']))
{
$carrosserie = implode(',', $_POST['carrosserie']);
if (preg_replace('/[^A-Za-z0-9\-]/', '', $carrosserie)) {
$sql .= ' AND carrosserie IN(:carrosserie)';
}
}
如果选中复选框
merk
,则代码将执行。也许查询有问题?
//We prepare our SELECT statement.
$statement = $pdo->prepare($sql);
if(isset($_POST['merk']))
{
$statement->bindParam(":merk", $merk);
// $params[] .= $merk;
}
if(isset($_POST['brandstof']))
{
$statement->bindParam(":brandstof", $brandstof);
// $params[] .= $brandstof;
}
if(isset($_POST['carrosserie']))
{
$statement->bindParam(":carrosserie", $carrosserie);
// $params[] .= $carrosserie;
}
$statement->execute();
此代码过滤一个复选框输入,但在选择两个复选框时停止过滤。请参阅下面的示例。
所以我的 POST 数据如下所示:
Array ( [0] => BMW [1] => Skoda )
您在解析输入时使用了奇怪的引号,例如
"','"
。另外,您不应在语句中引用实际的占位符。
在聊天中交谈后,我意识到问题是 IN 子句并且 bindParams()
不支持数组。
来自 PDOStatement::execute: 的文档
input_parameters 具有尽可能多元素的值数组 正在执行的 SQL 语句中的绑定参数。所有值都是 被视为 PDO::PARAM_STR。
单个参数不能绑定多个值;例如,它 不允许将两个值绑定到单个命名参数 IN() 子句。
为了解决此问题,您需要将代码更改为如下所示:
// Enable error reporting to spot any warnings and errors.
ini_set('display_errors', true);
error_reporting(E_ALL);
$params = array();
// Creates an IN clause with placeholders and stores parameters
function createInParam(array $data, $name, $query, array &$params) {
$query .= " AND $name IN (";
foreach ($data as $key => $value) {
$params[$name . '_' . $key] = $value;
$query .= ":${name}_${key},";
}
return rtrim($query, ',') . ')';
}
// Bind all parameters to statement
function bindParams($statement, array $params) {
foreach ($params as $key => $value) {
$statement->bindParam(":$key", $params[$key]);
}
}
if (isset($_POST['merk'])) {
$merk = implode(',', $_POST['merk']);
if (preg_replace('/[^A-Za-z0-9\-]/', '', $merk)) {
$data = explode(',', $merk);
$sql = createInParam($data, 'merk', $sql, $params);
}
}
if (isset($_POST['brandstof'])) {
$brandstof = implode(',', $_POST['brandstof']);
if (preg_replace('/[^A-Za-z0-9\-]/', '', $brandstof)) {
$data = explode(',', $brandstof);
$sql = createInParam($data, 'brandstof', $sql, $params);
}
}
if (isset($_POST['carrosserie'])) {
$carrosserie = implode(',', $_POST['carrosserie']);
if (preg_replace('/[^A-Za-z0-9\-]/', '', $carrosserie)) {
$data = explode(',', $carrosserie);
$sql = createInParam($data, 'carrosserie', $sql, $params);
}
}
// Then bind all parameters and execute
bindParams($statement, $params);
if ($statement->execute()) {
// Success
}
做同样事情的另一种方法是:
$params = array();
if (isset($_POST['merk'])) {
$merk = implode(',', $_POST['merk']);
if (preg_replace('/[^A-Za-z0-9\-]/', '', $merk)) {
$inClause = implode(',', array_fill(0, count($_POST['merk']), '?'));
$sql .= " AND merk IN ($inClause)";
$params = array_merge($params, explode(',', $merk));
}
}
if (isset($_POST['brandstof'])) {
$brandstof = implode(',', $_POST['brandstof']);
if (preg_replace('/[^A-Za-z0-9\-]/', '', $brandstof)) {
$inClause = implode(',', array_fill(0, count($_POST['brandstof']), '?'));
$sql .= " AND brandstof IN ($inClause)";
$params = array_merge($params, explode(',', $brandstof));
}
}
if (isset($_POST['carrosserie'])) {
$carrosserie = implode(',', $_POST['carrosserie']);
if (preg_replace('/[^A-Za-z0-9\-]/', '', $carrosserie)) {
$inClause = implode(',', array_fill(0, count($_POST['carrosserie']), '?'));
$sql .= " AND carrosserie IN ($inClause)";
$params = array_merge($params, explode(',', $carrosserie));
}
}
if ($statement->execute($params)) {
// Success
}