如何使用Codeigniter从数据库列显示特定字段的总数？

Question

我想在“查看来自数据库的特定字段值”中显示。

例如我的桌子：

                            id  |  rec_scope  |  rec_category
                            --------------------------
                            1   |  Product      |  New
                            2   |  Process      |  Enhance
                            3   |  Process      |  New
                            4   |  System       |  Enhance
                            5   |  Product      |  New
                            6   |  Process      |  New
                            7   |  Product      |  Enhance
                            8   |  System       |  New
                            9   |  Product      |  New
                            10  |  Prcduct      |  New

我从以下方面得到灵感

COUNT / GROUP BY with active record?和Count and display how many of specific column result

控制器：

                            public function index()
                            {

                                $data['records_count']= $this->dashboard_m->records_count();
                                $data['records_scope']= $this->dashboard_m->records_scope();


                                $this->template->load('template', 'dashboard', $data);


                            }

型号：

                            public function records_scope() {
                                 $this->db->select('rec_scope, COUNT(rec_scope) as total');
                                 $this->db->group_by('rec_scope');
                                 $this->db->order_by('total', 'desc');
                                 $query = $this->db->get('records');


                                foreach ($query->result() as $row) 
                                    $data[] = array(
                                        'rec_scope'  => $row->rec_scope,
                                        'total'  => $row->total
                                    );



                                return $data;

                            }

如何在html视图中仅显示具有特定值的特定字段的总数？谢谢。

示例：

产品总数为5。

新产品总数为4。

“增强”产品的总分类类别为1。

Answer 1

这可能会产生您想要的结果：

    $this->db->select('*, COUNT(rec_scope) as count');
    $this->db->from('test');
    $this->db->group_by('rec_category, rec_scope');
    $this->db->order_by('rec_scope');
    $res = $this->db->get()->result();
    $data = array();
    foreach ($res as $item) {
        // initialize total
        if (!isset($data[$item->rec_scope]['Total'])) {
            $data[$item->rec_scope]['Total'] = 0;
        }
        $data[$item->rec_scope]['Total'] += $item->count;
        $data[$item->rec_scope][$item->rec_category] = $item->count;
    }
    echo '<pre>';
    print_r($data);