实现按照各种条件对数据库进行综合查询
基本功能：可以根据用户需要灵活查询
重难点：各种条件的可能、限制。
public List<users> selectA( string str,Hashtable h)
{ List<users> ulist = new List<users>(); cmd.CommandText = str;
conn.Open();
foreach (string s in h.Keys)
{
cmd.Parameters.Add(s, h[s]);
} SqlDataReader dr = cmd.ExecuteReader(); if (dr.HasRows)
{
while (dr.Read())
{
users u = new users(); u.Ids = Convert.ToInt32(dr[]);
u.Username = dr[].ToString();
u.Password = dr[].ToString();
u.Nickname = dr[].ToString();
u.Sex = Convert.ToBoolean(dr[]);
u.Birthday = Convert.ToDateTime(dr[]);
u.Nation = dr[].ToString();
ulist.Add(u); } }
conn.Close(); return ulist; } //查询共有多少条信息————— 条件查询用
public int selectAllline(string str, Hashtable h)
{ int a = ; cmd.CommandText = str;
conn.Open();
foreach (string s in h.Keys)
{
cmd.Parameters.Add(s, h[s]);
} SqlDataReader dr = cmd.ExecuteReader(); if (dr.HasRows)
{
dr.Read(); a = Convert .ToInt32( dr[]); } conn.Close(); return a; }
方法
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title> <style type="text/css">
.div1 {
width: %;
height: 80px;
text-align: center;
line-height: 80px;
font-size: 30px;
} /*表格样式*/
.tab {
width: %;
background-color: blue;
text-align: center;
}
</style> </head>
<body>
<form id="form1" runat="server">
<div class="div1">奇点0216班学生信息</div> <div>
用户名：<asp:TextBox ID="Text_name" runat="server"></asp:TextBox>
性别：<asp:DropDownList ID="Dr_sex" runat="server">
<asp:ListItem Value="null" Text =""> </asp:ListItem>
<asp:ListItem Value="">男</asp:ListItem>
<asp:ListItem Value="">女</asp:ListItem>
</asp:DropDownList> 生日：<asp:DropDownList ID="Dr_bir" runat="server">
<asp:ListItem Value ="null" Text="" > </asp:ListItem>
</asp:DropDownList>
民族：<asp:DropDownList ID="Dr_nation" runat="server">
<asp:ListItem Value="null">===所有===</asp:ListItem>
</asp:DropDownList> <asp:Button ID="But_tj" runat="server" Text="查询" />
<asp:Button ID="But_qubu" runat="server" Text="查询全部" />
</div> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<br />
<br />
<br />
<br />
<%--使用 Repeater 添加数据--%>
<asp:Repeater ID="Repeater1" runat="server"> <HeaderTemplate>
<%-- 头模板--%> <table class="tab">
<tr style="color: white; height: 30px;">
<td>编号</td>
<td>用户名</td>
<td>密码</td>
<td>昵称</td>
<td>性别</td>
<td>生日</td>
<td>年龄</td>
<td>民族</td>
<td>设置</td>
</tr>
</HeaderTemplate> <ItemTemplate>
<%-- 项模板--%> <tr style="background-color: white;">
<td><%#Eval("Ids") %></td>
<td><%#Eval("Username") %></td>
<td><%#Eval("Password") %></td>
<td><%#Eval("Nickname") %></td>
<td><%#Eval("Sexstr") %></td>
<td><%#Eval("Birthdaystr") %></td>
<td><%#Eval("Age") %></td>
<td><%#Eval("NationName") %></td>
<td>
<a href="xiugai.aspx?i=<%#Eval("Ids") %>">编辑 </a>
<a onclick="return confirm('是否要删除<%#Eval("NickName") %>？');" href="shanchu.aspx?i=<%#Eval("Ids") %>">删除</a>
</td>
</tr> </ItemTemplate> <FooterTemplate>
<%--脚模板--%> <tr style="color: white; height: 30px;">
<td>本次查询共有[
<asp:Literal ID="Literal1" runat="server"></asp:Literal>]条
</td> <%-- 在这里取不到控件--%>
</tr>
</table>
</FooterTemplate> </asp:Repeater>
本次查询共有[ <asp:Literal ID="Literal2" runat="server"></asp:Literal> ]条记录 <a href="zhuce.aspx" target="_blank">添加新同学</a> </form>
</body>
</html>
前台展示
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 _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//绑定生日
for (int i = DateTime.Now.Year; i >= ; i--)
{
ListItem li = new ListItem();
li.Text = i.ToString();
li.Value = i.ToString();
Dr_bir.Items.Add(li);
} //绑定民族
List<usernation> ulist = new usernationData().selectAll();
foreach (usernation u in ulist)
{
ListItem li = new ListItem();
li.Text = u.NationName;
li.Value = u.NationCode; Dr_nation.Items.Add(li); } }
But_tj.Click += But_tj_Click;
But_qubu.Click += But_qubu_Click; Repeater1.DataSource = new usersData().selectAll();
Repeater1.DataBind(); Literal2.Text = new usersData().selectAll().Count.ToString(); } //查全部
void But_qubu_Click(object sender, EventArgs e)
{
Repeater1.DataSource = new usersData().selectAll();
Repeater1.DataBind(); Literal2.Text = new usersData().selectAll().Count.ToString(); } //组合查
void But_tj_Click(object sender, EventArgs e)
{
Hashtable hs = new Hashtable(); //哈希表集合 string sql = " select * from users "; int count = ; //匹配用户名
if (Text_name.Text.Length > )
{
sql += "where Username like @a"; hs.Add("@a", "%" + Text_name.Text.Trim() + "%"); //用哈希表集合装 @a count++; // 如果用户名填写了 记一下，为后面连接字符准备
} //匹配性别 if (Dr_sex.SelectedValue != "null")
{
if (count > )
{ sql += " and Sex=" + Dr_sex.SelectedValue;
}
else
{
sql += "where Sex=" + Dr_sex.SelectedValue;
}
count++;
} //匹配生日
if (Dr_bir.SelectedValue !="null")
{
if (count > )
{ sql += " and YEAR( Birthday)= '" + Dr_bir.SelectedValue+"'";
}
else
{
sql += "where YEAR( Birthday)=' " + Dr_bir.SelectedValue+"'";
}
count++; } //匹配民族 if (Dr_nation.SelectedValue != "null")
{
if (count > )
{ sql += " and Nation= '" + Dr_nation.SelectedValue+"'";
}
else
{
sql += "where Nation= '" + Dr_nation.SelectedValue+"'";
}
count++;
} List < users> u =new usersData().selectA(sql , hs);
Repeater1.DataSource = u;
Repeater1.DataBind(); //Literal1.Text = u.Count.ToString ();
//无法对Literal1 进行定位 Literal2.Text = u.Count.ToString(); Label1.Text = sql; } }
后台代码
效果图
