datatable排序实现

前端页面的datatable如下

当点击表头时，会触发排序请求。在chrome浏览器中，F12,查看请求，发现如下：

1. order[0][column]:
   2 表示根据第3列进行排序
2. order[0][dir]:
   desc 表示降序排列

JS中datatable的定义如下

var listDataTable = $('#listDataTable').dataTable({
        "paging": true,
        "ordering": true,
        "info": true,
        "searching": true,
        "aLengthMenu": [10, 25, 50, 100],
        "oLanguage": {
            "sLengthMenu": "每页显示 _MENU_ 条记录",
            "sZeroRecords": "抱歉， 没有找到",
            "sInfo": "从 _START_ 到 _END_ /共 _TOTAL_ 条数据",
            "sInfoEmpty": "",
            "sInfoFiltered": "(从 _MAX_ 条数据中检索)",
            "sZeroRecords": "无数据",
            "sSearch": "",
            "sProcessing": "查询中...",
            "oPaginate": {
                "sFirst": "首页",
                "sPrevious": "前一页",
                "sNext": "后一页",
                "sLast": "尾页"
            }

        },
        "bProcessing": true,
        "bServerSide": true,
        "iDisplayLength": 10,
        "iDisplayStart": 0,
        /*"order": [[3, "desc"]],*/

        /*会弹出提示Cannot reinitialise DataTable 把提示关掉  http://datatables.club/faqs/  */
        "retrieve": true,
        "destroy": true,

        "drawCallback": function (settings) {
            $('input[name="idCheck"]').iCheck({
                checkboxClass: 'icheckbox_minimal-blue'
            });
        },
        "ajax": {
            "url": serchURL,
            "data":{
                "beginTime":$("#beginTime").val(),
                "endTime":$("#endTime").val()
            }
        },
        "columnDefs": [
            {
                "targets": 0,
                "orderable": false,
                "render": function (data, type, full, meta) {
                    return '<input type="checkbox" name="idCheck" value="' + data + '">'
                }
            },
            {
                "type": "date",
                "targets": 3,
                "orderData": [ 3, 0 ],
                "render": function (data, type, full, meta) {
                    if (data == null || data == '') {
                        return '';
                    }
                    return new Date(data)
                        .Format('yyyy-MM-dd');
                }
            }
        ],
        "aoColumns": [
            {"mData": "id"},
            /*{"mData": "clusterId"},*/
            {"mData": "clusterName"},
            {"mData": "docNum"},
            {"mData": "date"}
        ]
    });

后台controller层获取datatable传递进来的排序参数

@PrivilegeRequire(code = "/system")
    @RequestMapping(value = "/listClusterIncrementDoc", method = {RequestMethod.GET, RequestMethod.POST}, produces = "application/json")
    @ResponseBody
    public JSONObject listClusterIncrementDoc(HttpServletRequest req, Pagination pagination, String clusterId,String beginTime,String endTime) {

        try {
            Pagination pg = buildPaginationFromReq(req, pagination);


            //排序参数
            String order = req.getParameter("order[0][column]");//排序的列号
            String orderDir = req.getParameter("order[0][dir]");//排序的顺序asc or desc
            String orderColumn = req.getParameter("columns["+order+"][data]");//排序的列。注意，我认为页面上的列的名字要和表中列的名字一致，否则，会导致SQL拼接错误
            if(orderDir != null && !orderDir.isEmpty() && orderColumn != null && !orderColumn.isEmpty()){
                if(orderColumn.equals("clusterName")){//数据库中没有clusterName这个字段，换成clusterId
                    orderColumn = "clusterId";
                }
                pg.getParams().put("orderDir", orderDir);//排序方向
                pg.getParams().put("orderColumn", orderColumn);//排序的列
            }

            if (clusterId != null && !clusterId.isEmpty()) {
                pg.getParams().put("clusterId", clusterId);
            }
            if (beginTime != null && !beginTime.isEmpty()) {
                pg.getParams().put("beginTime", beginTime);
            }
            if (endTime != null && !endTime.isEmpty()) {
                pg.getParams().put("endTime", endTime);
            }

            logger.info("pg.getParams():" + pg.getParams());

            List<ClusterDocOfDay> clusterDocOfDayList = docService.query(pg);
            int count = docService.count(pg);

            //获取集群名
            for (ClusterDocOfDay indexDeleteApply : clusterDocOfDayList) {
                try {
                    indexDeleteApply.setClusterName(clusterService.selectById(indexDeleteApply.getClusterId() + "").getName());
                } catch (Exception e) {
                    logger.error(e.getMessage(), e);
                }
            }

            JSONObject result = new JSONObject();
            result.put("iTotalDisplayRecords", count);
            result.put("iTotalRecords", count);
            result.put("aaData", clusterDocOfDayList);

            return result;
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
        }
        return new JSONObject();
    }

Mybatis根据参数构造sql语句

    <select id="query" resultMap="BaseResultMap">
        select <include refid="Base_Column_List"/>
        from es_cluster_doc_statistics
        <include refid="whereSQL" />
        <if test="params.orderColumn != null and params.orderColumn != ''">
            order by ${params.orderColumn} ${params.orderDir}
        </if>
        limit #{offset}, #{size}
    </select>