Where 子句基于多个动态值，CodeIgniter

Question

下拉框是根据用户分配给的客户动态填充的。问题是，当我想搜索分配给用户的客户时（如果他们选择查看All 客户的选项），我必须执行如下查询：

查询 1：

SELECT * FROM LotDispDashBoardDB.disp_dummy where (customer = 'DL1' or customer = 'BC1') and stage like 'T%' and lot_status like 'close%';

我不想做

查询 2：

SELECT * FROM LotDispDashBoardDB.disp_dummy where stage like 'T%' and lot_status like 'close%';

因为我希望用户只能看到他们自己分配的客户，所以我不希望他们看到所有可用的客户。

下拉框只有一个固定值All，其余为个别客户名称。如果用户选择All 表示他想查看All 他分配的客户。在下面的控制器中，如果他选择所有我会得到$all_customer 数组。如果不是，我只会选择客户。

在模型中知道它是否全部，我检测接收到的值是否是一个数组。如果它是一个数组，我会遍历它并使用 CodeIgniter 的活动记录$this->db->or_where('customer', $customer); 进行查询。 主要问题是查询。如前所述，我尝试像查询 1 一样。如何放置括号并动态编写 where 子句？

控制器：

public function load_lot_table()
{
    // Get customers from session
    $customer_session = $this->session->userdata['logged_in']['customers'];

    foreach($customer_session as $cust_object)
    {
        $all_customer[] = $cust_object->customer;
    }

    // Get form values
    if($this->input->get())
    {
        $selected_customer = $this->input->get('cust_drop_down');
        $stage = $this->input->get('area_drop_down');
        $lot_status = $this->input->get('status_drop_down');
        $search_lot = ltrim( $this->input->get('search_lot') );

        if($selected_customer == 'all')
        {
            $customer = $all_customer;
        }
        else
        {
            $customer = $selected_customer;
        }
    }
    else
    {
        // Default values when page is loaded because form is not submitted yet
        $customer = $all_customer;
        $stage = 'all';
        $lot_status = 'all';
        $search_lot = '';
    }

    // Keys are the column names
    $search = array(
    'customer' => $customer,
    'stage' => $stage,
    'lot_status' => $lot_status,
    'search_lot' => $search_lot
    );

    // Paginate retrieved lots
    $results = $this->paginate_create_table($search);

    /*** other codes ***/

}

private function paginate_create_table($search = null)
{
    if( is_array( $search['customer'] ) )
    {
        $customer = 'all';
    }
    else
    {
        $customer = $search['customer'];
    }

    // Set pagination configuration
    $config = array();
    $config['base_url'] = base_url()."index.php/Home/on_hold_lot";
    $config['suffix'] = '?cust_drop_down='.$customer.'&area_drop_down='.$search['stage'].'&status_drop_down='.$search['lot_status'].'&search_lot='.$search['search_lot'];
    $config['first_url'] = $config['base_url'].$config['suffix'];
    $config['total_rows'] = $this->home_model->fetch_lots('rows', $search);
    $config['per_page'] = 10;
    $config['uri_segment'] = 3;

    /*** Other codes ****/
}

型号：

public function fetch_lots($return, $search = null, $limit = null, $start = 0)
{
    if($limit != null)
    {
        $this->db->limit($limit, $start);
    }

    if($search != null)
    {
        if( $search['customer'] != 'all' && !is_array( $search['customer'] ) )
        {
            $this->db->where('customer', $search['customer']);
        }
        elseif( is_array( $search['customer'] ) )
        {
            foreach($search['customer'] as $customer)
            {
                $this->db->or_where('customer', $customer);
            }
        }

        if($search['stage'] != 'all')
        {
            $this->db->like('stage', $search['stage'], 'after');
        }

        if($search['lot_status'] != 'all')
        {
            $this->db->like('lot_status', $search['lot_status'], 'after');
        }

        if($search['search_lot'] != '')
        {
            $this->db->where('utac_lot', $search['search_lot']);
        }
    }
    /*** Other codes ***/
}

Answer 1

Codeigniter 允许您将pass a string 转换为$this->db->where()

例子：

$where = "(this = $that)";
$this->db->where($where);

当您遍历$search['customer'] 时，您可以构建一个字符串以用作您的where 查询。

if( $search['customer'] != 'all' && !is_array( $search['customer'] ) )
    {
        $this->db->where('customer', $search['customer']);
    }
    elseif( is_array( $search['customer'] ) )
    {
        for($i = 0, $i <= count($search['customer'], $i++)
        {
            // Use a FOR instead of FOREACH so we can count the loops.
            // 'WHERE' will be used on the first loop,
            // subsequent loops use 'OR'.
            if($i == 0) 
            {
                $where = "( WHERE customer = $search['customer'][$i] ";
            } else {
                $where .= " OR customer` = $search['customer'][$i] ";
            }
            if($i == count($search['customer']))
            {
                $where .= " ) ";
            }
        }
        $this->db->where($where);
    }
//... etc..
}

Answer 2

这是我想出的解决方案。

// If user selects a customer
if( $search['customer'] != 'all' && !is_array( $search['customer'] ) )
{
    $this->db->where('customer', $search['customer']);
}
// If user selects ALL
elseif( is_array( $search['customer'] ) )
{
    foreach($search['customer'] as $customer)
    {
        $all_customer[] = "customer = '$customer'";
    }

    // Example query would form: (customer = 'ABC' OR customer = 'BCD')
    $where_customer = "(";
    $where_customer .= implode(' OR ', $all_customer);
    $where_customer .= ")";

    $this->db->where($where_customer);
}