具有两个规则的数据表表顺序答案

【问题标题】：Datatables table order with two rules具有两个规则的数据表表顺序
【发布时间】：2017-10-15 16:29:41
【问题描述】：

我正在按照here 中的示例制作表格，除了我无法弄清楚的一件事之外，我已经全部运行了：

当这些值为“XXX/YY”时，我如何使用“numeroregisto”列的值来订购和设置表格的初始顺序 - 我需要它以便它对数字进行排序首先是斜线的右边，然后是左边的。右边的数字总是两位数，左边的数字可以从一到五位不等。

在另一个场合，使用不同的方法，我被告知这样做：

ORDER BY cast(substring_index(numeroregisto, '/', - 1) AS signed INTEGER), cast(substring_index(numeroregisto, '/', 1) AS signed INTEGER) ASC

但我似乎无法弄清楚如何使用这种方法来实现这一点：

var $table_registos = 'registos';
    var $column_order_registos = array('numeroregisto','dataregisto','amostra','especies.especie','requisitante',null); //set column field database for datatable orderable
    var $column_search_registos = array('registos.numeroregisto','registos.dataregisto','registos.amostra','especies.especie','requisitante'); //set column field database for datatable searchable just firstname , lastname , address are searchable
    var $order_registos = array('numeroregisto' => 'ASC'); // default order 


private function _get_datatables_query_registos()
    {
        $this->db->select('registos.*, origemmaterial.id AS omid, origemmaterial.origem, meioconservacao.id AS mcid, meioconservacao.meio, especies.id AS esid, especies.especie');
        $this->db->from('registos, origemmaterial, meioconservacao, especies');
        $this->db->where('registos.origemid=origemmaterial.id AND registos.meioid=meioconservacao.id AND registos.especieid=especies.id');


        $i_registos = 0;

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

                if($i_registos===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, $_POST['search']['value']);
                }
                else
                {
                    $this->db->or_like($item, $_POST['search']['value']);
                }

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

        if(isset($_POST['order'])) // here order processing
        {
            $this->db->order_by($this->column_order_registos[$_POST['order']['0']['column']], $_POST['order']['0']['dir']);
        } 
        else if(isset($this->order_registos))
        {
            $order_registos = $this->order_registos;
            $this->db->order_by(key($order_registos), $order_registos[key($order_registos)]);
        }
    }

任何帮助将不胜感激，在此先感谢！

【问题讨论】：

当前代码有什么问题？您能否将自己的代码缩小到您认为问题所在的部分？
我已按照您的建议编辑了帖子以缩小范围，认为现在应该清楚了。谢谢！

标签： php jquery mysql codeigniter datatables

【解决方案1】：

问题已解决，完全由我自己解决！只是希望我能想出一个更优雅的解决方案：

private function _get_datatables_query_registos()
    {
        $this->db->select('registos.*, origemmaterial.id AS omid, origemmaterial.origem, meioconservacao.id AS mcid, meioconservacao.meio, especies.id AS esid, especies.especie');
        $this->db->from('registos, origemmaterial, meioconservacao, especies');
        $this->db->where('registos.origemid=origemmaterial.id AND registos.meioid=meioconservacao.id AND registos.especieid=especies.id');


        $i_registos = 0;

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

                if($i_registos===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, $_POST['search']['value']);
                }
                else
                {
                    $this->db->or_like($item, $_POST['search']['value']);
                }

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

        if(isset($_POST['order'])) // here order processing
        {
            if($_POST['order']['0']['column']=='0' && $_POST['order']['0']['dir']=='asc'){

            $this->db->order_by('substring(numeroregisto,-2,2) ASC');


        }
        elseif($_POST['order']['0']['column']=='0' && $_POST['order']['0']['dir']=='desc'){

            $this->db->order_by('substring(numeroregisto,-2,2) DESC');


        }
            else{
            $this->db->order_by($this->column_order_registos[$_POST['order']['0']['column']], $_POST['order']['0']['dir']);
            }
        } 
        else if(isset($this->order_registos))
        {
            $order_registos = $this->order_registos;
            $this->db->order_by('substring(numeroregisto,-2,2) ASC');
        }
    }

【讨论】：