WebForm组合查询

封转类

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

/// <summary>

/// Car 的摘要说明

/// </summary>

public class Car

{

    public int ids{get;set;}

    public string code{get;set;}

    public string name{get;set;}

    public string brand{get;set;}

    public decimal oil{get;set;}

    public int powers{get;set;}

    public decimal price{get;set;}

}

建立方法

using System;

using System.Collections;

using System.Collections.Generic;

using System.Data.SqlClient;

using System.Linq;

using System.Web;

/// <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();

    }

    /// <summary>

    /// 查询所有数据信息

    /// </summary>

    /// <returns>泛型集合</returns>

    public List<Car> Select()

    {

        List<Car> list = 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.ids = Convert.ToInt32(dr[]);

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

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

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

                c.oil = Convert.ToDecimal(dr["oil"]);

                c.powers = Convert.ToInt32(dr["powers"]);

                c.price = Convert.ToDecimal(dr["price"]);

                list.Add(c);

            }

        }

        conn.Close();

        return list;

    }

    public List<Car> Select(int PageCount, int PageNumber)

    {

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

        cmd.CommandText = "select top " + PageCount + " *from car where ids not in(select top "+(PageCount * (PageNumber - ))+" ids from car)";

        conn.Open();

        SqlDataReader dr = cmd.ExecuteReader();

        if (dr.HasRows)

        {

            while (dr.Read())

            {

                Car c = new Car();

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

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

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

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

                c.oil = Convert.ToDecimal(dr["oil"]);

                c.powers = Convert.ToInt32(dr["powers"]);

                c.price = Convert.ToDecimal(dr["price"]);

                list.Add(c);

            }

        }

        conn.Close();

        return list;

    }

    /// <summary>

    /// 查询符合SQl条件的所有信息

    /// </summary>

    /// <param name="Tsql">查询条件</param>

    /// <param name="hhh">防止字符串注入攻击，把字符串加入哈希表集合中</param>

    /// <returns></returns>

    public List<Car> Select(string Tsql,Hashtable hhh)

    {

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

        cmd.CommandText = Tsql;

        cmd.Parameters.Clear();

        foreach(string k in hhh.Keys)

        {

            cmd.Parameters.Add(k, hhh[k]);

        }

        conn.Open();

        SqlDataReader dr = cmd.ExecuteReader();

        if (dr.HasRows)

        {

            while (dr.Read())

            {

                Car c = new Car();

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

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

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

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

                c.oil = Convert.ToDecimal(dr["oil"]);

                c.powers = Convert.ToInt32(dr["powers"]);

                c.price = Convert.ToDecimal(dr["price"]);

                list.Add(c);

            }

        }

        conn.Close();

        return list;

    }

}

页面设置

<%@ 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">

        name：<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>&nbsp;

        oil：<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>&nbsp;

        price：<asp:DropDownList ID="DropDownList1" runat="server">

            <asp:ListItem>&gt;=</asp:ListItem>

            <asp:ListItem>&lt;=</asp:ListItem>

        </asp:DropDownList>

        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>&nbsp;

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

        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br /><br />

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

            <HeaderTemplate>

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

                    <tr style="color: white;">

                        <td>ids</td>

                        <td>code</td>

                        <td>name</td>

                        <td>brand</td>

                        <td>oil</td>

                        <td>powers</td>

                        <td>price</td>

                    </tr>

            </HeaderTemplate>

            <ItemTemplate>

                <tr style="background-color: white;">

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

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

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

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

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

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

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

                </tr>

            </ItemTemplate>

            <FooterTemplate>

                </table>

            </FooterTemplate>

        </asp:Repeater>

    </form>

</body>

</html>

方法事件（代码）

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 hs = new Hashtable();

        int count = ;//中间变量，查看前面是否有查询条件

        string Tsql = "select *from car";

        if (!String.IsNullOrEmpty(TextBox1.Text.Trim()))

        {

            Tsql += " where name like @a";

            hs.Add("@a", "%" + TextBox1.Text.Trim() + "%");

            count++;//如果该条件写入内容，就加1，表示这里有查询条件

        }

        if (!String.IsNullOrEmpty(TextBox2.Text.Trim()))

        {

            if (count == )//如果前面没有查询条件，就用where

            {

                Tsql += " where oil = @b";

            }

            else//如果前面有查询条件，就用and

            {

                Tsql += " and oil = @b";

            }

            hs.Add("@b", TextBox2.Text.Trim());

            count++;

        }

        if (!String.IsNullOrEmpty(TextBox3.Text.Trim()))

        {

            if (count == )

            {

                Tsql += " where price " + DropDownList1.SelectedValue + " @c";

            }

            else

            {

                Tsql += " and price " + DropDownList1.SelectedValue + " @c";

            }

            hs.Add("@c", TextBox3.Text.Trim());

            count++;

        }

        Label1.Text = Tsql;

        Repeater1.DataSource = new CarData().Select(Tsql, hs);//数据源重新指向

        Repeater1.DataBind();//数据绑定

    }

}

总之：组合查询还是拼接SQl查询语句。

完！！

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