Question

我对数据库完全陌生，但当时我正尝试使用复选框实现包含多个类别的过滤器。让我们说我有一些包含3个表的数据库：游戏，属性和值。在这里，我试图实现一些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有一些过滤器，带有复选框和三类过滤：发布日期，开发者和开发国家：

<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>

这是我用来从客户端编译数据并使用ajax查询发送它的一些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//
    }
 });
}

此外，我还尝试编写submit.php，根据选中的属性过滤和返回游戏。现在它返回一个空数组。这是主要问题，我不太确定它应该如何正常工作

<?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。所以这里是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`);

和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);
?>

this topic.

中讨论了多个复选框过滤器问题的一般概念

如果这种方法足够有效，那么很高兴听到有经验的开发人员的意见。感谢。

多个类别使用复选框进行过滤

1 个答案: