我尝试使用ONE查询将表连接到子列中,列名为=>列值..
短表(1)"用户"结构与数据:
user_id email ...
1 xxx@xx.xx ...
2 yyy@yy.yy ...
短表(2)" users_permissions"结构与数据:
user_id plugin_enter offers_view ...
1 1 0 ...
2 1 1 ...
如果我使用经典方法 - 加入左侧
SELECT `uperms`.*, `u`.*
FROM (`users` as u)
LEFT JOIN `users_permissions` as uperms ON `u`.`user_id` = `uperms`.`user_id`
我得到经典输出
[0] = array(
'user_id' => 1,
'email' => xxx@xx.xx,
'plugin_enter' => 1,
'offers_view' => 0
),
[1] = array(
'user_id' => 2,
'email' => yyy@yy.yy,
'plugin_enter' => 1,
'offers_view' => 1,
...
),
我需要的只是输出到子阵列中:
[0] = array(
'user_id' => 1,
'email' => xxx@xx.xx,
'permissions => array(
'plugin_enter' => 1,
'offers_view' => 0
),
),
...
这可能与一个查询有关吗?
表2(权限)包含大约60列。是否可以使用列值将CONCAT列的名称,如果只连接到Table1的一行?
答案 0 :(得分:1)
MySQL没有数组或嵌套结构,因此无法在SQL中执行此操作。
更改您的查询,以便为users_permissions
的所有字段提供一致的命名方式。然后,您可以使用PHP循环将其键与该模式匹配的所有数组元素收集到permissions
数组中。
查询:
SELECT u.*, up.plugin_enter AS perm_plugin_enter, up.offers_view AS perm_offers_view, ...
FROM users AS u
JOIN users_permissions AS up ON u.user_id = up.user_id
PHP:
foreach ($all_results as &$row) {
$permissions = array();
foreach ($row as $key => $value) {
if (strpos($key, 'perm_') === 0) {
$permission[substr($key, 5)] = $value;
unset($row[$key]);
}
}
$row['permissions'] = $permissions;
}
您可以通过连接表中的所有列名和值来实现:
SELECT u.*, CONCAT_WS(',', CONCAT('plugin_enter:', plugin_enter), CONCAT('offers_view:', offers_view), ...) AS permissions
FROM users AS u
JOIN users_permissions AS up ON u.user_id = up.user_id
然后您的PHP代码可以使用explode()
将$row['permissions']
拆分为name:value
对数组,然后将它们转换为PHP数组中的key=>value
。
另一种解决方案是重新设计users_permissions
表:
user_id permission_type value
1 plugin_enter 1
1 offers_view 0
...
2 plugin_enter 1
2 offers_view 1
...
然后你可以查询:
SELECT u.*, GROUP_CONCAT(permission_type, ':', value) AS permission
FROM users AS u
JOIN users_permissions AS up on u.user_id = up.user_id
答案 1 :(得分:0)
另一种可能的解决方法是在查询中添加前缀 灵感来自帖子:https://stackoverflow.com/a/9926134/2795923
SELECT `u`.*, ':prefix_start:', `uperms`.*, ':prefix_end:'
FROM (`users` as u)
LEFT JOIN `users_permissions` as uperms ON `u`.`user_id` = `uperms`.`user_id`
输出数组如下所示:
[0] => array(
'user_id' => 1
'email' => xxx@xx.xx,
'prefix_start' =>
'plugin_enter' => 1,
'offers_view' => 0
'prefix_end' =>
)
...
然后简单的PHP脚本将prefix_start和prefix_end之间的所有数组数据添加到自己的子数组中。