一,ligerGrid是如何工作的。
在没有开始做之前,需要先了解一下ligerGrid是如何工作的。简单来说,liger grid 就是提交准备好的数据到指定的目标请求数据,拿到数据以后,显示出来。
所以问题在于发送什么数据,拿到什么数据。先来看看ligerGrid的参数:
url: null, pageSize: 10, sortName : null, sortOrder:null, root :'Rows', //数据源字段名 record:'Total', //数据源记录数字段名 pageParmName :'page', //页索引参数名,(提交给服务器) pagesizeParmName:'pagesize', //页记录数参数名,(提交给服务器) sortnameParmName:'sortname', //页排序列名(提交给服务器) sortorderParmName:'sortorder', //页排序方向(提交给服务器)
发送什么数据
page、pagesize、sortname、sortorder 这几个是默认发送到服务器的参数,可用于正确返回分页、排序后的数据。 如果需要查询,可能需要配置一下parms,格式如 parms:[{name:'wherestr',value:'status="active"'}] ,这样后台就可以收到这个参数了
比如我在页面上这样配置:
后台收到的数据,将会是:
拿到什么数据
Rows、Total这两个是返回数据的默认字段名,Rows是数据的json格式,Total是记录的总数,需要的数据类似这样的:
效果如下:
二,存储过程
CREATE PROCEDURE [dbo].[P_GridViewPager] ( @recordTotal INT OUTPUT, --输出记录总数 @viewName VARCHAR(800), --表名 @fieldName VARCHAR(800) = '*', --查询字段 @keyName VARCHAR(200) = 'Id', --索引字段 @pageSize INT = 20, --每页记录数 @pageNo INT =1, --当前页 @orderString VARCHAR(200), --排序条件 @whereString VARCHAR(800) = '1=1' --WHERE条件 ) AS BEGIN DECLARE @beginRow INT DECLARE @endRow INT DECLARE @tempLimit VARCHAR(200) DECLARE @tempCount NVARCHAR(1000) DECLARE @tempMain VARCHAR(1000) SET @beginRow = (@pageNo - 1) * @pageSize + 1 SET @endRow = @pageNo * @pageSize SET @tempLimit = 'rows BETWEEN ' + CAST(@beginRow AS VARCHAR) +' AND '+CAST(@endRow AS VARCHAR) --输出参数为总记录数 SET @tempCount = 'SELECT @recordTotal = COUNT(*) FROM (SELECT '+@keyName+' FROM '+@viewName+' WHERE '+@whereString+') AS my_temp' EXECUTE sp_executesql @tempCount,N'@recordTotal INT OUTPUT',@recordTotal OUTPUT --主查询返回结果集 SET @tempMain = 'SELECT * FROM (SELECT ROW_NUMBER() OVER ('+@orderString+') AS rows ,'+@fieldName+' FROM '+@viewName+' WHERE '+@whereString+') AS main_temp WHERE '+@tempLimit --PRINT @tempMain EXECUTE (@tempMain) END GO
三,准备一个通用的ashx页面
<%@ WebHandler Language="C#" Class="BillListData" %> using System; using System.Web; using ligerUI.Utility.Common; using ligerUI.Utility.LigerGrid; public class BillListData : IHttpHandler { public void ProcessRequest (HttpContext context) { context.Response.ContentType = "text/plain"; try { TryGetGridViewData(); } catch (Exception err) { context.Response.Write("null"); } context.Response.End(); } public void TryGetGridViewData() { System.Web.HttpContext context = System.Web.HttpContext.Current; GridViewPager pager = new GridViewPager(); string datajson = pager.GetDataJSON(); context.Response.Write(datajson); } public bool IsReusable { get { return false; } } }
四,实现处理方法(接收分页排序信息,并返回正确的数据)
public DataTable GetGridView(string gridViewName, string fieldName, string gridKeyName, int pageNo, int pageSize, string orderStr, string whereStr, ref int recordTotal) { string sqlCommad = "P_GridViewPager"; SqlParameter[] parms = new SqlParameter[]{ new SqlParameter("viewName",SqlDbType.VarChar,50), new SqlParameter("fieldName",SqlDbType.VarChar,50), new SqlParameter("keyName",SqlDbType.VarChar,50), new SqlParameter("pageNo",SqlDbType.Int), new SqlParameter("pageSize",SqlDbType.Int), new SqlParameter("orderString",SqlDbType.VarChar,50), new SqlParameter("whereString",SqlDbType.VarChar,50), new SqlParameter("recordTotal",SqlDbType.VarChar,50) }; parms[0].Value = gridViewName; parms[1].Value = fieldName; parms[2].Value = gridKeyName; parms[3].Value = pageNo; parms[4].Value = pageSize; parms[5].Value = orderStr; parms[6].Value = whereStr; parms[7].Direction = ParameterDirection.Output; DataTable dt = SqlHelper.ExecuteDataset(DataBaseHelper.connectionstring, CommandType.StoredProcedure, sqlCommad, parms).Tables[0]; recordTotal = CommonHelper.ObjToInt(parms[7].Value); return dt; }
public string GetDataJSON() { System.Web.HttpContext ctx = System.Web.HttpContext.Current; int pageno = CommonHelper.ObjToInt(ctx.Request.Params["page"]); int pagesize = CommonHelper.ObjToInt(ctx.Request.Params["pagesize"]); string sortname = CommonHelper.ObjToStr(ctx.Request.Params["sortname"]); string sortorder = CommonHelper.ObjToStr(ctx.Request.Params["sortorder"]); string gridviewname = CommonHelper.ObjToStr(ctx.Request.Params["gridviewname"]); string gridsearch = CommonHelper.ObjToStr(ctx.Request.Params["gridsearch"]); if (string.IsNullOrEmpty(gridviewname)) throw new ArgumentNullException("Grid视图名[gridsearch]不能为空"); if (pageno == 0 || pagesize == 0) { if (string.IsNullOrEmpty(sortorder) && string.IsNullOrEmpty(gridsearch)) { return GetDataJSON(gridviewname); } if(string.IsNullOrEmpty(sortorder)) return GetDataJSON(gridviewname, gridsearch); if (string.IsNullOrEmpty(gridsearch)) return GetDataJSONUseSQL(string.Format("select * from {0} order by {1} {2}", gridviewname, sortname, sortorder.ToLower() == "asc" ? "asc" : "desc")); return GetDataJSON(gridviewname, gridsearch, string.Format("order by {0} {1}", sortname, sortorder)); } if (string.IsNullOrEmpty(gridsearch) && string.IsNullOrEmpty(sortname)) { return GetDataJSON(gridviewname, pageno, pagesize); } if (string.IsNullOrEmpty(gridsearch) && !string.IsNullOrEmpty(sortname)) { return GetDataJSON(gridviewname, pageno, pagesize, sortname, sortorder); } if (!string.IsNullOrEmpty(gridsearch) && string.IsNullOrEmpty(sortname)) { return GetDataJSON(gridviewname, pageno, pagesize, gridsearch); } if (!string.IsNullOrEmpty(gridsearch) && !string.IsNullOrEmpty(sortname)) { return GetDataJSON(gridviewname, pageno, pagesize, sortname, sortorder, gridsearch); } return @"{""Rows"":[],""Total"":""0""}"; }