Remove particular id from database field - php

Question

Am storing a string separated using |, which lists the groups allowed, now my issue is if I delete a group than I am not able to remove the ID from that particular field, for example
allowed_group_id
+---------------+
1332|4545|5646|7986
So for example am deleting the group say no 5646, so how do I alter the scripts and remove that particular group from the allowed_group_id in script table?

Answer 1

I recommend taking the entry, exploding it by "|", removing the appropriate entry, imploding it back and updating.
$allowedGroupId = '1332|4545|5646|7986';
$parts = explode('|', $allowedGroupId);
if(($key = array_search($deleteGroup, $allowedGroupId)) !== false) {
unset($allowedGroupId[$key]);
}
$update = " ... "; //update with the new imploded values
Hope it helps

Answer 2

You can try this-
update table tableName set allowed_group_id = REPLACE(allowed_group_id, '5646', '');

Answer 3

Use explode:
$allowed_ids = explode('|', $current_allowed_group_ids);
if($remove_key = array_search($remove_id, $allowed_ids) !== false) {
unset($allowed_ids[$remove_key]);
}
$update_query = 'UPDATE table_name SET allowed_group_id = "'. implode('|', $allowed_ids) .'" WHERE id= ...';
But you might want to alter your database design slightly, creating a pivot table to check for allowed ids. Example:
+------------+
| GROUPS |
+----+-------+
| id | name |
+----+-------+
| 1 | grp_1 |
| 2 | grp_2 |
...
+--------------------+
| ALLOWED_GROUPS |
+--------------------+
| user_id | group_id |
+---------+----------+
| 2 | 1 |
| 2 | 2 |
| 5 | 2 |
...

Answer 4

Using Suresh response and improving it:
UPDATE TABLE tableName SET allowed_group_id = REPLACE(
REPLACE(allowed_group_id, '5646', ''),
'||',
'|');
First you search for '5646' string in allowed_group_id and replace it with empty string ''. Secondly you search and replace two bars from your result '||' with only one bar '|'. This will avoid having '1332|4545||7986' in your allowed_group_id.

Answer 5

Or you should have a table with 2 columns 1 with the id of the action you whant to allow and one with the id of a group.

Answer 6

Whilst the other answers will solve your problem as-is: you might want to consider normalising your database.
For example, if you currently have a table table_name containing id and allowed_group_id, then you would create a new table allowed_group containing multiple rows for each allowed group:
foreign_id | group_id
-----------+---------
1 | 1332
1 | 4545
1 | 5646
1 | 7986
...and so on. Here, foreign_id is the ID of the row in your existing table_name table. Now, instead of your above problem, you can simply DELETE FROM allowed_group WHERE foreign_id = 1 AND groupId = 5646.
This is called putting your data in first normal form.