Question

在我的应用程序中有一个dataTable，所以有搜索机制，dataTable中的一个列有一个int数据类型。以下是我进行服务器端搜索的方法：

private function _get_datatables_query()
{

    $this->db->from($this->table);

    $i = 0;

    foreach ($this->column_search as $item) // loop column
    {
        if($_POST['sSearch']) // if datatable send POST for search
        {    
            if($i===0) // first loop
            {
                $this->db->group_start(); // open bracket. query Where with OR clause better with bracket. because maybe can combine with other WHERE with AND.
                $this->db->like($item.'::varchar', $_POST['sSearch']);
            }
            else
            {
                $this->db->or_like($item.'::varchar', $_POST['sSearch']);
            }

            if(count($this->column_search) - 1 == $i) //last loop
                $this->db->group_end(); //close bracket
        }
        $i++;
    }

    if(isset($_POST['iSortCol_0'])) // here order processing
        $this->db->order_by($this->column_order[$_POST['iSortCol_0']], $_POST['sSortDir_0']);
    else if(isset($this->order))
    {
        $order = $this->order;
        $this->db->order_by(key($order), $order[key($order)]);
    }

}

在运行时我遇到错误，因为演员表是这样写的："some_column::varchar" like '%search_data%';它应该是这样的："some_column"::varchar like '%search_data%'

那么在调用$this->db->like时如何投射列？

Answer 1

当列是相关列时，我发现了一个to_char的技巧：

    foreach ($this->column_search as $item) // loop column
    {
        if($_POST['sSearch']) // if datatable send POST for search
        {

            if($i===0) // first loop
            {
                $this->db->group_start(); // open bracket. query Where with OR clause better with bracket. because maybe can combine with other WHERE with AND.
                if ($item == 'ladate')
                    $item = "ltrim(to_char(ladate,'99999999'))";
                $this->db->like($item, $_POST['sSearch']);
            }
            else
            {
                if ($item == 'ladate')
                    $item = "ltrim(to_char(ladate,'99999999'))";
                $this->db->or_like($item, $_POST['sSearch']);
            }

            if(count($this->column_search) - 1 == $i) //last loop
                $this->db->group_end(); //close bracket
        }
        $i++;
    }

使用$ this-＆gt; db-＆gt;时如何投射列？

1 个答案: