jquery easyui datagrid分页显示数据

本datagrid分页显示数据方法在每一次分页操作中只从数据库中获取pageSize个数据（后台分页）(-2144182054)
1》前台jquery代码
//初始化代码
$(function () {

var dg = $('#tableModule');

var opts = dg.datagrid('options');

var pager = dg.datagrid('getPager');

pager.pagination({

onSelectPage: function (pageNum, pageSize) {

opts.pageNumber = pageNum;

opts.pageSize = pageSize;

pager.pagination('refresh', {

pageNumber: pageNum,

pageSize: pageSize

});

Search(); //从数据库中获取数据，并加载

},

pageList: [10, 30, 50, 100], //可以设置每页记录条数的列表

beforePageText: '第', //页数文本框前显示的汉字

afterPageText: '页 共 {pages} 页',

displayMsg: '当前显示 {from} - {to} 条记录 共 {total} 条记录'

});

})
//从数据库中获取数据，并加载
function Search() {

var page_Number = $('#tableModule').datagrid('options').pageNumber; //pageNumber为datagrid的当前页码

var page_Size = $('#tableModule').datagrid('options').pageSize; //pageSize为datagrid的每页记录条数

var name = $('#inputName').val(); //得到查询关键字

$.post('Ajax/GetModuleListHandler.ashx', { Name: name, PageNumber: page_Number, PageSize: page_Size }, function (data) {

var data = $.parseJSON(data);

if (data != undefined && data != null) {

if (data.rows != undefined && data.rows != null && data.rows.length > 0 && data.rows[0].TotalCount != undefined && data.rows[0].TotalCount!=null)
{
data.total = Number(data.rows[0].TotalCount);

$('#tableModule').datagrid('loadData', data);

}

}

})

}
2》一般处理程序中的代码
public class GetModuleListHandler : IHttpHandler

{

public void ProcessRequest(HttpContext context)

{

context.Response.ContentType = "text/plain";

string searchModuleName = "", json = "[]",pageNumberStr,pageSizeStr; //searchModuleName为查询条件

int pageNumber = 0, pageSize = 0;

searchModuleName = context.Request["Name"];

pageNumberStr = context.Request["PageNumber"];

pageSizeStr = context.Request["PageSize"];

if (int.TryParse(pageNumberStr, out pageNumber) && int.TryParse(pageSizeStr, out pageSize))

{

string strWhere = " ";
if (!string.IsNullOrWhiteSpace(searchModuleName)) //如果搜索模块名不空，则将该模块及其子模块显示出来

{

strWhere = " LEFT(ModuleCode,(select top 1 LEN(ModuleCode) from SYS_Module where";

strWhere += string.Format(" Name='{0}'))=(select top 1 ModuleCode from SYS_Module where Name='{0}')", searchModuleName);

}

DataSet ds=new DataSet();

string cacheKey=new StringBuilder().Append("SYS_ModulePage").Append(pageNumber).ToString();

if (context.Cache[cacheKey] == null)

{

//从业务工厂得到模块处理对象

IBLL_SYS_Module iBLL_Module = BLLFactory.Factory.Get_BLL_SYS_Module();

ds = iBLL_Module.GetListByPage(strWhere, pageSize, pageNumber);

if (ds != null && ds.Tables.Count > 0)

{

context.Cache[cacheKey] = ds;

}

}

else

ds = context.Cache[cacheKey] as DataSet;

json = JsonType.DataTableToJson(ds.Tables[0]);

}

if (string.IsNullOrWhiteSpace(json)) json = "{\"total\":0,\"rows\":[]}";

context.Response.Write(json);

}

public bool IsReusable

{

get

{

return false;

}

}

}

3》业务逻辑

/// <summary>

/// 分页获取数据列表

/// </summary>

public DataSet GetListByPage(string strWhere, int pageSize, int pageIndex)

{

int startIndex = 0, endIndex = 0;

if (pageSize > 0 && pageIndex > 0)

{

startIndex = (pageIndex - 1) * pageSize + 1;

endIndex = pageSize * pageIndex;

}

if (startIndex > 0 && endIndex > startIndex)

return GetListByPage2(strWhere, "ModuleCode", startIndex, endIndex);

else

return null;

}

/// <summary>

/// 分页获取数据列表

/// </summary>

public DataSet GetListByPage2(string strWhere, string orderby, int startIndex, int endIndex)

{

StringBuilder strSql = new StringBuilder();

strSql.Append("SELECT * FROM ( ");

strSql.Append(" SELECT ROW_NUMBER() OVER (");

if (!string.IsNullOrEmpty(orderby.Trim()))

{

strSql.Append("order by T." + orderby);

}

else

{

strSql.Append("order by T.ModuleID desc");

}

strSql.Append(")AS Row, T.*,(select count(1) from SYS_Module ");

if (!string.IsNullOrEmpty(strWhere.Trim()))

{

strSql.Append(" WHERE " + strWhere);

strSql.Append(") as TotalCount from SYS_Module T ");

strSql.Append(" WHERE " + strWhere);

}

else

strSql.Append(") as TotalCount from SYS_Module T ");

strSql.Append(" ) TT");

strSql.AppendFormat(" WHERE TT.Row between {0} and {1}", startIndex, endIndex);

return DbHelperSQL.Query(strSql.ToString());

}
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