webform 组合查询

界面：

 <%@ 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>

 </head>

 <body>

     <form id="form1" runat="server">

     <div>

         名称：<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

         油耗：<asp:DropDownList ID="DropDownList1" runat="server" EnableViewState="True">

             <asp:ListItem Value="=">等于</asp:ListItem>

             <asp:ListItem Value="&gt;=">大于等于</asp:ListItem>

             <asp:ListItem Value="&lt;=">小于等于</asp:ListItem>

         </asp:DropDownList><asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

         价格：<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>-<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>

         <asp:Button ID="Button1" runat="server" Text="提交" /><br /><br />

         <asp:Repeater ID="Repeater1" runat="server">

                 <HeaderTemplate>

                     <table style="background-color: blue; width: 100%; text-align:center">

                         <thead>

                             <tr style="color: white;">

                                 <td>编号</td>

                                 <td>名称</td>

                                 <td>品牌</td>

                                 <td>上市时间</td>

                                 <td>油耗</td>

                                 <td>动力</td>

                                 <td>排量</td>

                                 <td>价格</td>

                                 <td>图片</td>

                             </tr>

                         </thead>

                         <tbody>

                 </HeaderTemplate>

                 <ItemTemplate>

                     <tr style="background-color: #808080">

                         <td><%#Eval("Code") %></td>

                         <td><%#Eval("Name") %></td>

                         <td><%#Eval("Brand") %></td>

                         <td><%#Eval("Time") %></td>

                         <td><%#Eval("Oil") %></td>

                         <td><%#Eval("Power") %></td>

                         <td><%#Eval("Exhaust") %></td>

                         <td><%#Eval("Price") %></td>

                         <td><%#Eval("Pic") %></td>

                     </tr>

                 </ItemTemplate>

                 <FooterTemplate>

                     </tbody>

             </table>

                 </FooterTemplate>

             </asp:Repeater>

     </div>

     </form>

 </body>

 </html>

界面

后台：

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 /// <summary>

 /// Car 的摘要说明

 /// </summary>

 public class Car

 {

     public Car()

     {

         //

         // TODO: 在此处添加构造函数逻辑

         //

     }

     public string Code { get; set; }

     public string Name { get; set; }

     public string Brand { get; set; }

     public DateTime Time { get; set; }

     public decimal Oil { get; set; }

     public int Power { get; set; }

     public decimal Exhaust { get; set; }

     public decimal Price { get; set; }

     public string Pic { get; set; }

 }

封装实体类

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 using System.Data.SqlClient;

 using System.Collections;

 /// <summary>

 /// CarData 的摘要说明

 /// </summary>

 public class CarData

 {

     SqlConnection conn = null;

     SqlCommand cmd = null;

     public CarData()

     {

         conn = new SqlConnection("server=.;database=mydb;user=sa;pwd=123");

         cmd = conn.CreateCommand();

     }

     public List<Car> Select()

     {

         List<Car> clist = new List<Car>();

         cmd.CommandText = "select *from Car";

         conn.Open();

         SqlDataReader dr = cmd.ExecuteReader();

         if (dr.HasRows)

         {

             while (dr.Read())

             {

                 Car c = new Car();

                 c.Code = dr[].ToString();

                 c.Name = dr[].ToString();

                 c.Brand = dr[].ToString();

                 c.Time = Convert.ToDateTime(dr[]);

                 c.Oil = Convert.ToDecimal(dr[]);

                 c.Power = Convert.ToInt32(dr[]);

                 c.Exhaust = Convert.ToInt32(dr[]);

                 c.Price = Convert.ToDecimal(dr[]);

                 c.Pic = dr[].ToString();

                 clist.Add(c);

             }

         }

         conn.Close();

         return clist;

     }

     public List<Car> Select(int count,int nowpage)

     {

         List<Car> clist = new List<Car>();

         cmd.CommandText = "select top "+count+" *from Car where Code not in (select top "+((nowpage-)*count)+" Code from Car) ";

         conn.Open();

         SqlDataReader dr = cmd.ExecuteReader();

         if (dr.HasRows)

         {

             while (dr.Read())

             {

                 Car c = new Car();

                 c.Code = dr[].ToString();

                 c.Name = dr[].ToString();

                 c.Brand = dr[].ToString();

                 c.Time = Convert.ToDateTime(dr[]);

                 c.Oil = Convert.ToDecimal(dr[]);

                 c.Power = Convert.ToInt32(dr[]);

                 c.Exhaust = Convert.ToInt32(dr[]);

                 c.Price = Convert.ToDecimal(dr[]);

                 c.Pic = dr[].ToString();

                 clist.Add(c);

             }

         }

         conn.Close();

         return clist;

     }

     public List<Car> Select(string sql,Hashtable hat)

     {

         List<Car> clist = new List<Car>();

         cmd.CommandText = sql;

         cmd.Parameters.Clear();

         foreach(string s in hat.Keys)

         {

             cmd.Parameters.AddWithValue(s,hat[s]);

         }

         conn.Open();

         SqlDataReader dr = cmd.ExecuteReader();

         if (dr.HasRows)

         {

             while (dr.Read())

             {

                 Car c = new Car();

                 c.Code = dr[].ToString();

                 c.Name = dr[].ToString();

                 c.Brand = dr[].ToString();

                 c.Time = Convert.ToDateTime(dr[]);

                 c.Oil = Convert.ToDecimal(dr[]);

                 c.Power = Convert.ToInt32(dr[]);

                 c.Exhaust = Convert.ToInt32(dr[]);

                 c.Price = Convert.ToDecimal(dr[]);

                 c.Pic = dr[].ToString();

                 clist.Add(c);

             }

         }

         conn.Close();

         return clist;

     }

 }

数据访问类

 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)

         {

             Repeater1.DataSource = new CarData().Select();

             Repeater1.DataBind();

         }

         Button1.Click += Button1_Click;

     }

     void Button1_Click(object sender, EventArgs e)

     {

         Hashtable has=new Hashtable ();

         string tsql="select *from Car";

         //判断文本框中是否有内容需要查询

         if (TextBox1.Text.Trim().Length > )

         {//如果有内容，那么就拼接到Tsql语句中去

             tsql += " where name like @name";

             has.Add("@name","%"+TextBox1.Text.Trim().ToUpper()+"%");

         }

         else

         {

             tsql += " where 1=1";

         }

         if (TextBox2.Text.Trim().Length > )

         {

             tsql += " and oil "+DropDownList1.SelectedValue+"@oil";

             has.Add("@oil", TextBox2.Text.Trim());

         }

         else

         {

             tsql += " and 1=1";

         }

         if (TextBox3.Text.Trim().Length > )

         {

             tsql += " and price>=@price1";

             has.Add("@price1", TextBox3.Text.Trim());

         }

         else

         {

             tsql += " and 1=1";

         }

         if (TextBox4.Text.Trim().Length > )

         {

             tsql += " and price<=@price2";

             has.Add("@price2", TextBox4.Text.Trim());

         }

         //将拼接好的Tsql语句执行后进行数据绑定

         Repeater1.DataSource = new CarData().Select(tsql,has);

         Repeater1.DataBind();

     }

 }

Default.aspx.cs 思路一：

 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)

         {

             Repeater1.DataSource = new CarData().Select();

             Repeater1.DataBind();

         }

         Button1.Click += Button1_Click;

     }

     void Button1_Click(object sender, EventArgs e)

     {

         Hashtable has = new Hashtable();

         string tsql = "select *from Car";

         int count = ;

         //判断文本框中是否有内容需要查询

         if (TextBox1.Text.Trim().Length > )

         {//如果有内容，那么就拼接到Tsql语句中去

             tsql += " where name like @name";

             has.Add("@name", "%" + TextBox1.Text.Trim().ToUpper() + "%");

             count++;

         }

         if (TextBox2.Text.Trim().Length > )

         {

             if (count > )

                 tsql += " and oil " + DropDownList1.SelectedValue + "@oil";

             else

                 tsql += " where oil " + DropDownList1.SelectedValue + "@oil";

             has.Add("@oil", TextBox2.Text.Trim());

             count++;

         }

         if (TextBox3.Text.Trim().Length > )

         {

             if (count > )

                 tsql += " and price>=@price1";

             else

                 tsql += " where price>=@price1";

             has.Add("@price1", TextBox3.Text.Trim());

             count++;

         }

         if (TextBox4.Text.Trim().Length > )

         {

             if (count > )

                 tsql += " and price<=@price2";

             else

                 tsql += " where price<=@price2";

             has.Add("@price2", TextBox4.Text.Trim());

         }

         //将拼接好的Tsql语句执行后进行数据绑定

         Repeater1.DataSource = new CarData().Select(tsql, has);

         Repeater1.DataBind();

     }

 }

Default.aspx.cs 思路二：

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