如何从codeigniter中的多行获取相同的foreign_key记录

Question

我试图在阵列中获得具有相同ID的记录.我尝试了"Group_by"查询,但结果是单个数组.请参阅下图中的记录.

查询:

$this->db->select('typeID,projectID,typeName,typeSize,dimensionWidth,dimensionHeight');
$this->db->from('propertytype');
$this->db->group_by('projectID');
$rec=$this->db->get()->result();

echo "<pre>";print_r($rec);exit();

结果:

Array
(
   [0] => stdClass Object
    (
        [typeID] => 1
        [projectID] => 1
        [typeName] => Residential
        [typeSize] => 5 MARLA
        [dimensionWidth] => 125
        [dimensionHeight] => 125
    )

   [1] => stdClass Object
    (
        [typeID] => 7
        [projectID] => 2
        [typeName] => Residential
        [typeSize] => 5 MARLA
        [dimensionWidth] => 26
        [dimensionHeight] => 50
    )

)

我希望结果像二维数组一样.

Array(
  [0]=> stdClass object(
      Array(...)
      Array(...)
      Array(...)
      Array(...)
  )

  [1]=> stdClass object(
      Array(...)
      Array(...)
      Array(...)
      Array(...)
  )
)

告诉我我在哪里弄错了？任何人都可以帮助我.我会非常感激的.

Answer 1

该GROUP BY子句通常用于Aggregate Functions返回每个组的汇总值.GROUP BY没有聚合的子句与使用类似SELECT DISTINCT.......该GROUP BY条款不订购数据.

我希望这可以帮到你:

$this->db->select('projectID');
$this->db->from('propertytype');
$this->db->distinct('projectID');
$rec=$this->db->get()->result();
$arr=array();

foreach ($rec as $r) {
    $this->db->select('typeID,projectID,typeName,typeSize,dimensionWidth,dimensionHeight');
    $this->db->from('propertytype');
    $this->db->where('projectID',$r->projectID);
    $rec=$this->db->get()->result();
    $arr[]=$rec;    
}

echo "<pre>";print_r($arr);exit();