使用复选框过滤多个类别

Question

我对数据库是完全陌生的，但是当时我正在尝试使用复选框来实现具有多个类别的过滤器。 假设我有一个包含3个表的数据库：游戏，属性和值。 在这里，我正在尝试实现一些EAV数据库模型：

CREATE TABLE IF NOT EXISTS `games` (
 `id` int(255) NOT NULL,
 `game_name` varchar(50) NOT NULL,
  KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `games` (`id`, `game_name`) VALUES
(1, 'Grand Theft Auto Vice City'),
(2, 'Counter Strike 1.6'),
(3, 'Fallout 2'),
(4, 'Minecraft');

CREATE TABLE IF NOT EXISTS `attributes` (
  `attr_id` int(50) NOT NULL,
  `attribute_name` varchar(255) NOT NULL,
  KEY (`attr_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `attributes` (`attr_id`, `attribute_name`) VALUES
(1, 'release'),
(2, 'developer'),
(3, 'country');

CREATE TABLE IF NOT EXISTS `values` (
  `entity_id` int(255) NOT NULL,
  `attribute_id` int(50) NOT NULL,
  `value` varchar(255) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `values` (`entity_id`, `attribute_id`, `value`) VALUES
(1, 1, '2002'),
(1, 2, 'Rockstar'),
(1, 3, 'USA'),
(2, 1, '2000'),
(2, 2, 'Valve'),
(2, 3, 'USA'),
(3, 1, '1998'),
(3, 2, 'Black Isle Studios'),
(3, 3, 'USA'),
(4, 1, '2011'),
(4, 2, 'Mojang'),
(4, 3, 'Sweden');

ALTER TABLE `values`
  ADD CONSTRAINT `values_ibfk_1` FOREIGN KEY (`attribute_id`) REFERENCES `attributes` (`attr_id`),
  ADD CONSTRAINT `values_ibfk_2` FOREIGN KEY (`entity_id`) REFERENCES `games` (`id`);

我的index.html具有一些带有复选框的过滤器和三个过滤类别：发布日期，开发人员和开发国家/地区：

<form id="filter">
 <h2>Date of release:</h2>
  <input type="checkbox" id="1998" name="1988"><label for="1988">1988</label><br>
<input type="checkbox" id="2000" name="2000"><label for="2000">2000</label><br>
<input type="checkbox" id="2002" name="2002"><label for="2002">2002</label><br>
<input type="checkbox" id="2011" name="2011"><label for="2011">2011</label>

<h2>Developer:</h2>
  <input type="checkbox" id="rockstar" name="Rockstar"><label for="rockstar">Rockstar</label><br>
<input type="checkbox" id="valve" name="Valve"><label for="valve">Valve</label><br>
<input type="checkbox" id="black-isle-studios" name="Black Isle Studios"><label for="black-isle-studios">Black Isle Studios</label><br>
<input type="checkbox" id="mojang" name="Mojang"><label for="mojang">Mojang</label>

<h2>Country:</h2>
  <input type="checkbox" id="usa" name="USA"><label for="usa">USA</label><br>
<input type="checkbox" id="sweden" name="Sweden"><label for="sweden">Sweden</label><br>
</form>

这是一些我用来从客户端编译数据并通过ajax查询发送的JS：

var $checkboxes = $("input:checkbox");
$checkboxes.on("change", function(){
  var opts = getGamesFilterOptions();
  updateGames(opts);
});

function getGamesFilterOptions(){
  var opts = [];
  $checkboxes.each(function(){
    if(this.checked){
      opts.push(this.name);
    }
  });
  return opts;
}

function updateGames(opts){
 $.ajax({
  type: "POST",
  url: "submit.php",
  dataType : 'json',
  cache: false,
  data: {filterOpts: opts},
  success: function(records){
    //show games depending on which values have been checked//
    }
 });
}

我也尝试编写submit.php ，该文件将根据检查的属性过滤并返回游戏。 现在，它返回一个空数组。 这是主要问题，我不确定该如何正常工作

<?php 
$pdo = new PDO('mysql:host=localhost;dbname=games_db', 'root', '');
$opts = $_POST['filterOpts'];
$qMarks = str_repeat('?,', count($opts) - 1) . '?';

$statement = $pdo->prepare('SELECT games.game_name FROM games INNER JOIN values ON attribute_id = attributes.attr_id WHERE value IN ($qMarks)');
$statement->execute($opts);
$results = $statement->fetchAll(PDO::FETCH_ASSOC);
$json = json_encode($results);
echo($json);
?>

Answer 1

所以最后我想出了一个解决方案。 所以这是games.sql文件：

CREATE TABLE `attributes` (
  `attribute_id` int(255) UNSIGNED NOT NULL,
  `attribute_name` varchar(255) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

INSERT INTO `attributes` (`attribute_id`, `attribute_name`) VALUES
(1, 'release'),
(2, 'developer'),
(3, 'country');

CREATE TABLE `games` (
  `game_id` int(255) UNSIGNED NOT NULL,
  `game_name` varchar(50) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

INSERT INTO `games` (`game_id`, `game_name`) VALUES
(1, 'Grand Theft Auto Vice City'),
(2, 'Counter Strike 1.6'),
(3, 'Fallout 2'),
(4, 'Minecraft');

CREATE TABLE `games_values` (
  `game_id` int(255) UNSIGNED NOT NULL,
  `attribute_id` int(255) UNSIGNED NOT NULL,
  `value` varchar(255) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

INSERT INTO `games_values` (`game_id`, `attribute_id`, `value`) VALUES
(1, 1, '2002'),
(1, 2, 'Rockstar'),
(1, 3, 'USA'),
(2, 1, '2000'),
(2, 2, 'Valve'),
(2, 3, 'USA'),
(3, 1, '1998'),
(3, 2, 'Black Isle Studios'),
(3, 3, 'USA'),
(4, 1, '2011'),
(4, 2, 'Mojang'),
(4, 3, 'Sweden');

ALTER TABLE `games_values`
  ADD CONSTRAINT `games_values_ibfk_1` FOREIGN KEY (`attribute_id`) REFERENCES `attributes` (`attribute_id`),
  ADD CONSTRAINT `games_values_ibfk_2` FOREIGN KEY (`game_id`) REFERENCES `games` (`game_id`);

并submit.php ：

<?php 
$pdo = new PDO('mysql:host=localhost;dbname=games', 'root', '');
$opts = $_GET['filterOpts'];
$qMarks = str_repeat('?,', count($opts) - 1) . '?';

$statement = $pdo->prepare("SELECT DISTINCT games.game_name FROM games INNER JOIN games_values ON games.game_id = games_values.game_id WHERE value IN ($qMarks)");
$statement->execute($opts);
$results = $statement->fetchAll(PDO::FETCH_ASSOC);
$json = json_encode($results);
echo($json);
?>

本主题讨论了此多复选框过滤器的一般概念。

如果这种方法能产生足够的效果，将很高兴听到有经验的开发人员的意见。 谢谢。