drozdo drozdo - 1 year ago 69
MySQL Question

Php mysql join to subarray with field names

I trying to join table using ONE query into sub array with column name => column value..

Short table(1) "users" structure with data:

user_id email ...
1 [email protected] ...
2 [email protected] ...


Short table(2) "users_permissions" structure with data:

user_id plugin_enter offers_view ...
1 1 0 ...
2 1 1 ...


If i use classic method - join left

SELECT `uperms`.*, `u`.*
FROM (`users` as u)
LEFT JOIN `users_permissions` as uperms ON `u`.`user_id` = `uperms`.`user_id`


I get classic output

[0] = array(
'user_id' => 1,
'email' => [email protected],
'plugin_enter' => 1,
'offers_view' => 0
),
[1] = array(
'user_id' => 2,
'email' => [email protected],
'plugin_enter' => 1,
'offers_view' => 1,
...
),


All i need is output into subarray as this:

[0] = array(
'user_id' => 1,
'email' => [email protected],
'permissions => array(
'plugin_enter' => 1,
'offers_view' => 0
),
),
...


Is this possible to do with ONE query?

Table2 (permissions) contains about 60 columns. Is possible to CONCAT column's names with column value, if is joined to Table1 only one row?

Answer Source

MySQL doesn't have arrays or nested structures, so it's not possible to do this in SQL.

Change your query so you give all the fields from users_permissions a consistent naming style. Then you can use a PHP loop to collect all the array elements whose keys match that pattern into the permissions array.

Query:

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;
}

You could do it by concatenating all the column names and values in the table:

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

Then your PHP code can use explode() to split $row['permissions'] into array of name:value pairs, and then convert those to key=>value in the PHP array.

Another solution is to redesign your users_permissions table:

user_id permission_type value
1       plugin_enter    1
1       offers_view     0
...
2       plugin_enter    1
2       offers_view     1
...

Then you can query:

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
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