曾今的代码系列——自己的分页控件+存储过程实现分页

LoginByAjax

<title>Ajax登陆</title>
<script src="Scripts/common.js" type="text/javascript"></script>
<script type="text/javascript">
var xhr; window.onload = function () { xhr = new createXmlHttp(); gel("btnLogin").onclick = loginByAjax; } function loginByAjax() { gel("msgImg").src = "Images/load.gif"; var uName = gel("txtUserName").value; var uPwd = gel("txtPwd").value; var urlStr = "DoLogin.ashx"
var data = "uName=" + uName + "&uPwd=" + uPwd; xhr.open("POST", urlStr, true); xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); xhr.onreadystatechange = function () { if (xhr.readyState == 4) { if (xhr.status == 200) { var responseText = xhr.responseText; if (responseText == "1") { alert("登陆成功"); window.location = "Default.aspx"; } else { alert("登陆失败"); } } } } xhr.send(data); } </script>

登陆成功后Default.aspx

public partial class Default : System.Web.UI.Page { protected StringBuilder sbTableContent = new StringBuilder(); protected string PageHtml = string.Empty; protected int nextPage = 1; protected int nowPage = 1; BLL.StudentManager studentManager = new BLL.StudentManager(); protected void Page_Load(object sender, EventArgs e) { //加载 //加载之前先判断是否登陆
if (new WebHelper().IsLogin()) { LoadList(); } else { Response.Redirect("AjaxLogin.aspx"); } } private void LoadList() { int initRowCount=0; int initPageCount=0; MyPage page = new MyPage(); page.TryParseCurrentPageIndex(Request.QueryString["page"]); List<Model.Students> listStudents = studentManager.QueryListByPageIndexPro(page.CurrentPageIndex,page.PageSize , out initRowCount, out initPageCount); page.PageCount = initPageCount; page.TotalCount = initRowCount; page.UrlFormat = "Default.aspx?page={n}"; PageHtml = page.RenderToHTML(); int index = (page.CurrentPageIndex - 1) * page.PageSize + 1; if (listStudents!=null) { foreach (Model.Students model in listStudents) { sbTableContent.Append("<tr><td>" + index.ToString()+ "</td>"); sbTableContent.Append("<td>"+model.SClasses.CName+"</td>"); sbTableContent.Append("<td>"+model.SLoginName+"</td>"); sbTableContent.Append("<td>"+model.SCnName+"</td>"); sbTableContent.Append("<td>"+(model.SGender.Value?"男":"女")+"</td>"); sbTableContent.Append("<td>"+model.STel+"</td>"); sbTableContent.Append("<td>"+model.SAddtime.Value.ToShortDateString()+"</td>"); sbTableContent.Append("<td><a href='Modify.aspx?id="+model.SID.ToString()+"'>修改</a> <a href='javascript:doDel("+model.SID.ToString()+")'>删除</a>"); index++; } } } }

自绘分页控件

public class MyPage { public int TotalCount { get; set; } public int PageSize { get; set; } public int CurrentPageIndex { get; set; } public int MaxPageCount { get; set; } public string UrlFormat { get; set; } public int PageCount { get; set; } public MyPage() { PageSize = 4; MaxPageCount = 10; } private void Check() { System.Diagnostics.Debug.Assert(PageSize>0); System.Diagnostics.Debug.Assert(CurrentPageIndex>0); System.Diagnostics.Debug.Assert(!string.IsNullOrWhiteSpace(UrlFormat)); } public void TryParseCurrentPageIndex(string pn) { int temp; if (int.TryParse(pn,out temp)) { CurrentPageIndex = temp; } else { CurrentPageIndex = 1; } } public string RenderToHTML() { Check(); StringBuilder sb = new StringBuilder(); //double tempCount = (TotalCount+(0.0) )/ PageSize; //int pageCount = (int)Math.Ceiling(tempCount); int visibleStart = CurrentPageIndex - MaxPageCount / 2; if (visibleStart<1)//6还是没区别 { visibleStart = 1; } int visibleEnd = visibleStart + MaxPageCount; if (visibleEnd > PageCount) { visibleEnd = PageCount; } if (CurrentPageIndex>1) { sb.Append(GetPageLink(1,"首页")); sb.Append(GetPageLink(CurrentPageIndex-1,"上一页")); } else { sb.Append("<span>首页</span>"); sb.Append("<span>上一页</span>"); } for (int i = visibleStart; i <=visibleEnd; i++) { if (i==CurrentPageIndex) { sb.Append("<span>").Append(i).Append("</span>"); } else { sb.Append(GetPageLink(i,i.ToString())); } } if (CurrentPageIndex < PageCount) { sb.Append(GetPageLink(CurrentPageIndex+1,"下一页")); sb.Append(GetPageLink(PageCount, "末页")); } else { sb.Append("<span>下一页</span>"); sb.Append("<span>末页</span>"); } return sb.ToString(); } private string GetPageLink(int i,string text) { StringBuilder sb = new StringBuilder(); string url = UrlFormat.Replace("{n}",i.ToString()); sb.Append("<a href='").Append(url).Append("'>").Append(text).Append("</a>") ; return sb.ToString(); } }

数据访问层的调用存储过程代码:

public List<Model.Students> QueryListByPageIndexPro(int pageIndex,int pageSize,out int rowCount,out int pageCount) { Model.Students model = null; DataTable dt = dbHelper.ExecProForPageList(pageIndex, pageSize, out rowCount, out pageCount); List<Model.Students> list = null; if (dt.Rows.Count>0) { list = new List<Model.Students>(); foreach (DataRow dr in dt.Rows) { model = new Model.Students(); SetDr2Model(dr,model); list.Add(model); } } return list; }

public DataTable ExecProForPageList(int pageIndex, int pageSize, out int rowCount, out int pageCount) { SqlParameter[] parameters = { new SqlParameter("@PageIndex",SqlDbType.Int,4), new SqlParameter("@PageSize",SqlDbType.Int,4), new SqlParameter("@RowCount",SqlDbType.Int,4), new SqlParameter("@PageCount",SqlDbType.Int,4) }; parameters[0].Value = pageIndex; parameters[1].Value = pageSize; parameters[2].Direction = ParameterDirection.Output; parameters[3].Direction = ParameterDirection.Output; SqlCommand cmd = new SqlCommand(); cmd.CommandText = "GetPageDataOutRowPageCount"; cmd.CommandType = CommandType.StoredProcedure; cmd.Connection = Connection; cmd.Parameters.AddRange(parameters); SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataTable dt = new DataTable(); adapter.Fill(dt); rowCount = Convert.ToInt32(parameters[2].Value); pageCount = Convert.ToInt32(parameters[3].Value); return dt; }

存储过程代码：

Create PROCEDURE [dbo].[GetPageDataOutRowPageCount] ( @PageIndex int = 1,--当前页数
@PageSize  int = 1,--每页大小
@RowCount int output,--总行数(传出参数)
@PageCount int output--总页数(传出参数)
) AS
begin
DECLARE @sql NVARCHAR(225),@sqlCount NVARCHAR(225) select @RowCount =COUNT(SID),@PageCount=CEILING((COUNT(SID)+0.0)/@PageSize) FROM Students where SIsDel=0
SET @sql='SELECT TOP '+str(@PageSize) +' * FROM Students,Classes where SCID=CID and SIsDel=0 and SID not in(select top '+str((@PageIndex-1)*@PageSize) +' SID from Students where SIsDel=0)order by SID'
print @sql
EXEC(@sql) end

总结