retrieve and print values after comma separator from single field using join (codeigniter)

问题

I have one problem while retrieveing value from mysql using codeigniter.

I have one table name task and in that there is one field of assigneduserid.

Table - Task:

id  | title     | assigneduserid
-------------------------------------
1   | Workspace | 23,21

Table - User

id  | title 
-----------------
23  | Ashish
21  | Ritesh

In assigneduserid field there are two values in that field that is 23,21.

I want to print both usertitle like this : Ashish,Ritesh from usertable using that assigneduserid.

And also i want to set that value in ascending order which are in assigneduseid

I am trying to print that record on page using echo like following

Following is Code Where i am printing:

<?php echo $task_row->usertitle;?>

Above code is printing only Ashish.

but i would like to print Ashish,Ritesh

following is my model.

function getTask($id, $is_master_admin) 
        {
         $this->db->select('workspace.title as workspacetitle, user.title as usertitle,task.*');
        $this->db->join(WORKSPACE, WORKSPACE . '.id = ' . TASK . '.workspaceid', 'inner');
        $this->db->join(USER, USER . '.id = ' . TASK . '.assigneduserid', 'inner');
        $this->db->from(TASK);
        if (!$is_master_admin) {
            $this->db->where(USER . '.id', $id);
        }
        $this->db->where(TASK . '.tasktypeid', '1');
        $query = $this->db->get();
        if ($query->num_rows() > 0) {
            return $query->result();
        } else {
            return false;
        }
    }

Thank you in advanced

回答1:

use this

function getTask($id, $is_master_admin)
{

$this->db->select('task.*, workspace.title as workspacetitle, GROUP_CONCAT( user.title ) AS usertitle,task.assigneduserid,user.id',FALSE);
$this->db->join(WORKSPACE , WORKSPACE . '.id = ' . TASK . '.workspaceid', 'inner');
$this->db->join(USER,("FIND_IN_SET(USER .id , TASK.assigneduserid)"), 'inner');
$this->db->from(TASK);
$this->db->group_by("task.id");
if (!$is_master_admin)
{

$this->db->where ("FIND_IN_SET($id, task.assigneduserid)");
}
$this->db->where(TASK . '.tasktypeid', '1');
$query = $this->db->get();

if ($query->num_rows() > 0) {
return $query->result();
} else {
return false;
}

}

回答2:

Use FIND_IN_SET() & GROUP_CONCAT() functions

Try this:

SELECT t.id, t.title, GROUP_CONCAT(u.title) AS userTitle
FROM Task t 
INNER JOIN User u ON FIND_IN_SET(t.assigneduserid, u.id) 
GROUP BY t.id

EDIT::

SELECT t.id, t.title, GROUP_CONCAT(u.title) AS userTitle
FROM Task t 
INNER JOIN `User` u ON CONCAT(',', t.assigneduserid, ',') LIKE ('%,', u.id, ',%')
GROUP BY t.id

回答3:

@Ritesh: follow Saharsh Shah, you can put this query into this command $this->db->query(); or you can follow this link to do what you want http://ellislab.com/codeigniter/user-guide/database/active_record.html

来源：https://stackoverflow.com/questions/20878315/retrieve-and-print-values-after-comma-separator-from-single-field-using-join-co

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