组合查询与分页查询结合应用
Posted 张鑫4477
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using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class ZS : System.Web.UI.Page { Hashtable ht = new Hashtable(); int pcou = 2; protected void Page_Load(object sender, EventArgs e) { Button1.Click += Button1_Click; Button2.Click += Button2_Click; ////////////////////////////////////////////////////////////////////// if (!IsPostBack) { Repeater1.DataSource = new StusData().SelectTJ(TSQL(1), ht); Repeater1.DataBind(); //最大页数绑定 PageAll.Text = PageAAll().ToString(); ////下拉菜单绑定 for (int x = 1; x <= PageAAll(); x++) { ListItem li = new ListItem(x.ToString(), x.ToString()); DropDownPage.Items.Add(li); } } PageJump.Click += PageJump_Click; PageNext.Click += PageNext_Click; PageLast.Click += PageLast_Click; PageOld.Click += PageOld_Click; PageFirst.Click += PageFirst_Click; Select.Click += Select_Click; } //拼写TSQL语句查询所有信息***** public string TSQL(int zz) { ht.Clear(); int cc = 0;//记录下一条查询数据 string sql = "select top " + pcou + "* from Stus "; string t1 = ""; //1.将条件查询的语句拼完 if (Name.Text.Trim().Length > 0) { cc++; t1 += " where Name like @a "; ht.Add("@a", "%" + Name.Text.Trim() + "%"); } if (Sex.SelectedValue != "") { if (cc == 0) { t1 += " where " + Sex.SelectedValue; cc++; } else { t1 += " and " + Sex.SelectedValue; } } if (Score.Text.Trim().Length > 0) { if (cc == 0) { t1 += " where Score " + ScorePD.SelectedValue + " @b "; ht.Add("@b", Score.Text.Trim()); cc++; } else { t1 += " and Score " + ScorePD.SelectedValue + " @b "; ht.Add("@b", Score.Text.Trim()); } } //2.将分页的语句拼完 if (cc == 0) { sql += " where Ids not in (select top " + (pcou * (zz - 1)) + " Ids from Stus " + t1 + " )"; } else { sql += t1 + " and Ids not in (select top " + (pcou * (zz - 1)) + " Ids from Stus " + t1 + " )"; } return sql; } //拼写tsql1语句获取共有多少条信息***** public string tsql1() { ht.Clear(); int cc = 0;//记录下一条查询数据 string sql = "select count(*) from Stus"; string t1 = ""; //1.将条件查询的语句拼完 //string aa = " select *from Stus "; if (Name.Text.Trim().Length > 0) { cc++; t1 += " where Name like @a "; ht.Add("@a", "%" + Name.Text.Trim() + "%"); } if (Sex.SelectedValue != "") { if (cc == 0) { t1 += " where " + Sex.SelectedValue; cc++; } else { t1 += " and " + Sex.SelectedValue; } } if (Score.Text.Trim().Length > 0) { if (cc == 0) { t1 += " where Score " + ScorePD.SelectedValue + " @b "; ht.Add("@b", Score.Text.Trim()); } else { t1 += " and Score " + ScorePD.SelectedValue + " @b "; ht.Add("@b", Score.Text.Trim()); } } sql += t1; return sql; } //获取最大页数 public int PageAAll() { int cc = 0; Decimal bb = Convert.ToDecimal(new StusData().SelectPage(tsql1(), ht)); cc = Convert.ToInt32(Math.Ceiling(bb / pcou)); return cc; } // 查询按钮点击事件 void Select_Click(object sender, EventArgs e) { DropDownPage.Items.Clear(); Repeater1.DataSource = new StusData().SelectTJ(TSQL(1), ht); Repeater1.DataBind(); //最大页数绑定 PageAll.Text = PageAAll().ToString(); //下拉菜单绑定 for (int x = 1; x <= PageAAll(); x++) { ListItem li = new ListItem(x.ToString(), x.ToString()); DropDownPage.Items.Add(li); } } //首页**** void PageFirst_Click(object sender, EventArgs e) { Repeater1.DataSource = new StusData().SelectTJ(TSQL(1), ht); Repeater1.DataBind(); //当前页数变换 PageNow.Text = "1"; DropDownPage.SelectedValue = "1"; } //上一页**** void PageOld_Click(object sender, EventArgs e) { //获取上一页的页数 int n = Convert.ToInt32(PageNow.Text) - 1; //如果页数小于最小页数 if (n < 1) { return; } //绑定数据 Repeater1.DataSource = new StusData().SelectTJ(TSQL(n), ht); Repeater1.DataBind(); //当前页数变换 PageNow.Text = n.ToString(); DropDownPage.SelectedValue = n.ToString(); } //尾页**** void PageLast_Click(object sender, EventArgs e) { //绑定数据 Repeater1.DataSource = new StusData().SelectTJ(TSQL(PageAAll()), ht); Repeater1.DataBind(); //当前页数变换 PageNow.Text = PageAAll().ToString(); DropDownPage.SelectedValue = PageAAll().ToString(); } //下一页***** void PageNext_Click(object sender, EventArgs e) { //获取下一页的页数 int n = Convert.ToInt32(PageNow.Text) + 1; //如果页数超过了最大页数 if (n > PageAAll()) { return; } //绑定数据 Repeater1.DataSource = new StusData().SelectTJ(TSQL(n), ht); Repeater1.DataBind(); //当前页数变换 PageNow.Text = n.ToString(); DropDownPage.SelectedValue = n.ToString(); } //跳转按钮**** void PageJump_Click(object sender, EventArgs e) { int a = Convert.ToInt32(DropDownPage.SelectedValue); //绑定数据 Repeater1.DataSource = new StusData().SelectTJ(TSQL(a), ht); Repeater1.DataBind(); //当前页数变换 PageNow.Text = a.ToString(); } void Button2_Click(object sender, EventArgs e) { Response.Cookies["username"].Expires = DateTime.Now.AddDays(-10); Response.Redirect("DL.aspx"); } void Button1_Click(object sender, EventArgs e) { //Response.Redirect("TJXS.aspx"); Label2.Text = TSQL(1); } }
<span>当前第</span><asp:Label ID="PageNow" runat="server" Text="1"></asp:Label><span></span>页</span> <span>共</span><asp:Label ID="PageAll" runat="server" Text="1"></asp:Label><span>页</span> <asp:DropDownList ID="DropDownPage" runat="server"></asp:DropDownList> <asp:Button ID="PageJump" runat="server" Text="跳转" /> <asp:Button ID="PageFirst" runat="server" Text="首页" /> <asp:Button ID="PageOld" runat="server" Text="上一页" /> <asp:Button ID="PageNext" runat="server" Text="下一页" /> <asp:Button ID="PageLast" runat="server" Text="尾页" /> <span>查询筛选: 学生姓名:</span> <asp:TextBox ID="Name" runat="server"></asp:TextBox> <span>学生性别:</span> <asp:DropDownList ID="Sex" runat="server"> <asp:ListItem Text="男 和 女" Value=""></asp:ListItem> <asp:ListItem Text="男" Value="Sex = 1 "></asp:ListItem> <asp:ListItem Text="女" Value="Sex = 0 "></asp:ListItem> </asp:DropDownList> <span>学生成绩:</span> <asp:DropDownList ID="ScorePD" runat="server"> <asp:ListItem Text="大于等于" Value=">="></asp:ListItem> <asp:ListItem Text="小于" Value="<"></asp:ListItem> <asp:ListItem Text="等于" Value="="></asp:ListItem> </asp:DropDownList> <asp:TextBox ID="Score" runat="server"></asp:TextBox> <asp:Button ID="Select" runat="server" Text="查询" /> <div class="d1" style="font-size: 30px;"> 学生数据展示 </div> <div> <%--数据展示--%> <table class="d2"> <tr> <td>编号</td> <td>姓名</td> <td>性别</td> <td>民族</td> <td>年龄</td> <td>生日</td> <td>班级</td> <td>分数</td> <td>学生信息操作</td> </tr> <asp:Repeater ID="Repeater1" runat="server"> <%--循环展示的数据--%> <ItemTemplate> <tr style="background-color: white;"> <td><%#Eval("Ids") %></td> <td><%#Eval("Name") %></td> <td><%#Eval("Sexx") %></td> <td><%#Eval("Nationn") %></td> <td><%#Eval("Age") %></td> <td><%#Eval("Bir") %></td> <td><%#Eval("Classs") %></td> <td><%#Eval("Score") %></td> <td> <input type="button" value="修改" oo="<%#Eval("Ids")%>" class="btn1" /> <a href="SCXS.aspx?i=<%#Eval("Ids") %>"> <input type="button" value="删除" onclick="return confirm(‘是否要删除 <%#Eval("Name")%> ?‘);" /></a> </td> </tr> </ItemTemplate> </asp:Repeater> </table>
数据访问类:
//分页组合查询统一方法*** public List<Stus> SelectTJ(string s1, Hashtable ht) { List<Stus> ss = new List<Stus>(); cmd.CommandText = s1; foreach (string hh in ht.Keys) { cmd.Parameters.AddWithValue(hh, ht[hh]); } conn.Open(); SqlDataReader dr = cmd.ExecuteReader(); if (dr.HasRows) { ss = new List<Stus>(); while (dr.Read()) { Stus s = new Stus(); s.Ids = Convert.ToInt32(dr["Ids"]); s.Name = dr["Name"].ToString(); s.Sex = Convert.ToBoolean(dr["Sex"]); s.Birthday = Convert.ToDateTime(dr["Birthday"]); s.Nation = dr["Nation"].ToString(); s.Class = dr["Class"].ToString(); s.Score = Convert.ToInt32(dr["Score"]); ss.Add(s); } } conn.Close(); return ss; } //分页组合查询查询信息条数**** public int SelectPage(string s, Hashtable ht) { int a = 0; cmd.CommandText = s; foreach (string hh in ht.Keys) { cmd.Parameters.AddWithValue(hh, ht[hh]); } conn.Open(); SqlDataReader dr = cmd.ExecuteReader(); if (dr.HasRows) { dr.Read(); a = Convert.ToInt32(dr[0]); } conn.Close(); return a; }
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