Question

我真的在努力尝试将这两个查询（下面）和INNER JOIN一起使用。我在_GET中传递一个数组。我想从两个不同的mysql表中选择。

网址数组_GET示例： www.mysite.com/users_slideshows[]=one&users_slideshows[]=two&users_slideshows[]=three

以下是我尝试合并的两个问题：

$mysqli = new mysqli('localhost','root','1234','root');
$records = array();

foreach ($_GET["users_slideshows"] as $djahjkdsh) {
    $result = $mysqli->query("SELECT * FROM playlist_builder WHERE playlist_builder.volume IN ('".$djahjkdsh."') ");
    while($row = $result->fetch_array(MYSQL_ASSOC)) {
            $records[] = array('tags' => array($row));
    }
    $json = json_encode($records, JSON_PRETTY_PRINT);

}

foreach ($_GET["users_slideshows"] as $djahjkdsh) {
    $result = $mysqli->query("SELECT * FROM custom_slideshow WHERE custom_slideshow.volume IN ('".$djahjkdsh."') ");
    while($row = $result->fetch_array(MYSQL_ASSOC)) {
            $records[] = array('tags' => array($row));
    }
    $json = json_encode($records, JSON_PRETTY_PRINT);

}

如果我只从一张桌子中选择，它就会很完美，但只有当我将两者结合在一起时才能完美。

我已尝试过以下内容......没有发生

SELECT * FROM playlist_builder INNER JOIN custom_slideshow ON custom_slideshow.volume = playlist_builder.volume IN ('".$djahjkdsh."')

如果有人能帮我解决我做错的事情，我会非常感激。谢谢！

Answer 1

您的SQL语法不正确，因为您在同一逻辑ON子句中运行了两个表达式。只需将ON子句分成多个表达式即可。此外，使用一个值，使用IN上的等式。

SELECT * FROM playlist_builder 
INNER JOIN custom_slideshow ON custom_slideshow.volume = playlist_builder.volume 
AND playlist_builder.volume = ?)

或者，使用WHERE子句：

SELECT * FROM playlist_builder 
INNER JOIN custom_slideshow ON custom_slideshow.volume = playlist_builder.volume 
WHERE playlist_builder.volume = ?)

PHP （使用parameterization和表别名）

$sql = 'SELECT * FROM playlist_builder p 
        INNER JOIN custom_slideshow c ON c.volume = p.volume AND p.volume = ?';

foreach ($_GET["users_slideshows"] as $djahjkdsh) {

    $stmt = $mysqli->prepare($sql);
    $stmt->bind_param("s", $djahjkdsh);
    $stmt->execute();

    $result = $stmt->get_result();
    while($row =  $result->fetch_assoc()) {
         $records[] = array('tags' => array($row));
    }
    $json = json_encode($records, JSON_PRETTY_PRINT);    

    $stmt->close();
}

PHP - 从数组中查询多个表

1 个答案: