php - Codeigniter:将查询结果存入关联数组

Question

我的数据库中有两个表

1.main_category字段(id,main_name);

2.sub_category字段(id,main_id, sub_name)

这里main_id用于连接两个表，我想得到如下数组的结果

Array
(
    [CCTV] => Array
        (
            [0] => Array
                (
                    [id] => 1
                    [main_id] => 4
                    [name] => first
                )

            [1] => Array
                (
                    [id] => 3
                    [main_id] => 4
                    [name] => second
                )

            [2] => Array
                (
                    [id] => 4
                    [main_id] => 4
                    [name] => second
                )

        )

    [Security Camera] => Array
        (
            [0] => Array
                (
                    [id] => 5
                    [main_id] => 5
                    [name] => first
                )

            [1] => Array
                (
                    [id] => 6
                    [main_id] => 5
                    [name] => second
                )

            [2] => Array
                (
                    [id] => 7
                    [main_id] => 5
                    [name] => second
                )

        )

)

这里数组的key是来自main_category表的main_name字段，每个键的关联数组包含>符合条件的行

其中 main_category.id=sub_category.main_id

我希望数据库查询达到上述结果。是否可以使用连接查询？

Answer 1

这是连接查询的结构，您可以根据自己的要求更改它。

function myfun($id){
  $query = "select main_cat.*, sub_cat.* from main_category main_cat
  Join sub_category sub_cat 
  ON main_cat.id = sub_cat.main_id
  where main_cat.id = $id";
  $data = $this->db->query($query);
  return $data->result_array();
}

希望这对您有帮助。