在 codeigniter 中进行多个连接和分组

Question

我正在使用 Codeigniter，我想做的是按组查询 returns 用户。

一个群组可以有一个或多个用户，这里举例表格：

groups table        users table              users_by_groups table
    id                  id                    id_group   id_user
    1                   10                      1          10
    2                   11                      1          11
    3                   12                      1          12
                                                2          11
                                                3          12

我的查询：

public function getUsersByGroup(){
        $this->db->select('g.vgro_name,u.vusr_user');
        $this->db->from('vts_user_by_group b');
        $this->db->join('vts_groups g', 'b.vubg_vgro_id = g.vgro_id');
        $this->db->join('vts_users u', 'b.vubg_vusr_id = u.vusr_id');
        $this->db->group_by('g.vgro_name,vusr_user');
        // $this->db->order_by('u.vusr_user','asc');
        $query = $this->db->get();
        return $query->result();
    }

返回的内容：

      0 => 
object(stdClass)[28]
  public 'vgro_name' => string 'GROUP1' (length=4)
  public 'vusr_user' => string 'john' (length=9)
1 => 
object(stdClass)[29]
  public 'vgro_name' => string 'GROUP1' (length=4)
  public 'vusr_user' => string 'alice' (length=4)
2 => 
object(stdClass)[30]
  public 'vgro_name' => string 'GROUP2' (length=3)
  public 'vusr_user' => string 'mark' (length=3)

这不是我想要的。例如我假装的是：

 0 => 
object(stdClass)[31]
  public 'vgro_name' => string 'GROUP1' (length=7)
  public 'vusr_user' => string 'john' (length=7)
  public 'vusr_user' => string 'alice' (length=7)

    2 => 
object(stdClass)[30]
  public 'vgro_name' => string 'GROUP2' (length=3)
  public 'vusr_user' => string 'mark' (length=3)

我做错了什么？

Answer 1

您可以在 PHP 中执行 'grouping':

public function getUsersByGroup(){
    $this->db->select('g.vgro_name,u.vusr_user');
    $this->db->from('vts_user_by_group b');
    $this->db->join('vts_groups g', 'b.vubg_vgro_id = g.vgro_id');
    $this->db->join('vts_users u', 'b.vubg_vusr_id = u.vusr_id');
    $query = $this->db->get();

    $resultsByGroup = array();

    foreach($query->result_array() as $row) {
        $resultsByGroup[$row['vgro_name']][] = $row['vusr_user'];
    }

    return $resultsByGroup;
}

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