高级查询--asp.net(C#)

为了更好的去重用高级查询控件，将此控件做成用户控件。利用VS2005新建一个用控件扩展名为.ascx的文件，参考下图：


本高级查询的原理是：当用户选择选择内容时，相应的筛选条件，筛选范围进行动态的变化。将筛选条件保存在lblFilter标签中。利用DataView的RowFilter，对数据进行筛选，但为了更好的管理，将这些配置信息保存在表中。注：以下是对应的html源代码：






<%...@ Control Language="C#" AutoEventWireup="true" CodeFile="Advance_Query.ascx.cs"


Inherits="Public_AdvanceQuery" %>


<br />


<table border="1" bordercolor="#ffffff" cellpadding="0" cellspacing="1" width="100%">


<tr>





<td style="height: 15px">


筛选内容：</td>


<td style="height: 15px">


<asp:DropDownList ID="ddlContent" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlContent_SelectedIndexChanged">


</asp:DropDownList></td>


<td style="height: 15px">


筛选条件：</td>


<td style="height: 15px">


<asp:DropDownList ID="ddlCondition" runat="server">


</asp:DropDownList></td>


<td style="height: 15px">


筛选范围：</td>


<td style="height: 15px">


 <asp:DropDownList ID="ddlArea" runat="server">


</asp:DropDownList>


<asp:TextBox ID="txtArea" runat="server"></asp:TextBox>


<asp:Label ID="lblFilter" runat="server" Visible="False"></asp:Label>


</td>


<td style="height: 15px">


<asp:Button ID="btnSel" runat="server" OnClick="btnSel_Click" Text="筛选" />


<asp:Button ID="btnCancel" runat="server" OnClick="btnCancel_Click"


Text="取消" /></td>


</tr>


</table>


<br />

以下是本页面对应的后台代码，主要是事件，属性，方法


using System;


using System.Data;


using System.Configuration;


using System.Collections;


using System.Web;


using System.Web.Security;


using System.Web.UI;


using System.Web.UI.WebControls;


using System.Web.UI.WebControls.WebParts;


using System.Web.UI.HtmlControls;




/**//// <summary>


/// 高级查询用户控件


/// 创建人：AAA


/// 创建日期：2006-08-29


/// </summary>


public partial class Public_AdvanceQuery : System.Web.UI.UserControl




...{


//定义类


WebClass.Query query;


protected void Page_Load(object sender, EventArgs e)




...{


if (!Page.IsPostBack)




...{


this._gv.DataSource = this._dv;


this._gv.DataBind();


//设置筛选内容


this.Load_ddlContent();


}


}


protected void ddlContent_SelectedIndexChanged(object sender, EventArgs e)




...{


query = new WebClass.Query(this._form);


if (query.Get_Content_Flag(this.ddlContent.SelectedValue) == "0")




...{


this.ddlArea.Items.Clear();


this.ddlArea.DataSource = query.DataSet_Area(ddlContent.SelectedValue);


this.ddlArea.DataTextField = "Name";


this.ddlArea.DataValueField = "Code";


this.ddlArea.DataBind();


//文本框不可见


this.txtArea.Visible = false;


this.ddlArea.Visible = true;


}


else




...{


this.txtArea.Text = "";


this.txtArea.Visible = true;


this.ddlArea.Visible = false;


}


query.Set_Condition(this.ddlContent.SelectedValue, this.ddlCondition);


}


protected void btnSel_Click(object sender, EventArgs e)




...{


query = new WebClass.Query(this._form);


//将筛选范围的值存储在文本框里


if (this.txtArea.Text == "")


this.txtArea.Text = this.ddlArea.SelectedValue;


if (btnSel.Text == "筛选")




...{


this.btnSel.Text = "继续进行筛选";


this.btnCancel.Text = "取消筛选";


}


if (this.lblFilter.Text == "")


this.lblFilter.Text = query.Filter(this.ddlContent.SelectedValue, this.ddlCondition.SelectedValue, this.txtArea.Text);


else


this.lblFilter.Text += " AND " + query.Filter(this.ddlContent.SelectedValue, this.ddlCondition.SelectedValue, this.txtArea.Text);


//定义DataView


DataView dv = new DataView();


dv = this._dv;


dv.RowFilter = this.lblFilter.Text;


this._gv.DataSource = dv;


this._gv.DataBind();


//清空文本框里的内容


this.txtArea.Text = "";


}


protected void btnCancel_Click(object sender, EventArgs e)




...{


DataView dv = new DataView();


this.btnSel.Text = "筛选";


this.btnCancel.Text = "取消";


this.lblFilter.Text = "";


dv = this._dv;


this._gv.DataSource = dv;


this._gv.DataBind();


}


public void Load_ddlContent()




...{




query = new WebClass.Query(this._form);


//设置筛选内容


this.ddlContent.Items.Clear();


this.ddlContent.DataSource = query.DataSet_Content();


this.ddlContent.DataTextField = "By_Name";


this.ddlContent.DataValueField = "Field";


this.ddlContent.DataBind();


//设置筛选条件


query.Set_Condition(ddlContent.SelectedValue, this.ddlCondition);


//设置筛选范围


if (query.Get_Content_Flag(ddlContent.SelectedValue) == "0")




...{


this.ddlArea.Items.Clear();


this.ddlArea.DataSource = query.DataSet_Area(ddlContent.SelectedValue);


this.ddlArea.DataTextField = "Name";


this.ddlArea.DataValueField = "Code";


this.ddlArea.DataBind();


//文本框不可见


this.txtArea.Visible = false;


this.ddlArea.Visible = true;


}


else




...{


this.txtArea.Text = "";


this.txtArea.Visible = true;


this.ddlArea.Visible = false;


}


query.Set_Condition(this.ddlContent.SelectedValue, this.ddlCondition);


}




/**//// <summary>


/// 当前的窗体


/// </summary>


private string _form;




/**//// <summary>


/// 数据源


/// 注：数据类型 DataView


/// </summary>


private DataView _dv;




/**//// <summary>


/// GridView控件


/// </summary>


private GridView _gv;




/**//// <summary>


/// 设置窗体名称


/// 注：只写属性


/// </summary>


public string strForm




...{


set




...{


this._form = value;


}


}




/**//// <summary>


/// 设置查询的数据源


/// 注：只写属性 类型：DataView


/// </summary>


public DataView DataSource




...{


set




...{


this._dv = value;


}


}




/**//// <summary>


/// 设置GridView控件


/// </summary>


public GridView GridViewID




...{


set




...{


this._gv = value;


}


}




/**//// <summary>


/// 获取筛选字符串/设置筛选条件


/// </summary>


public string Filter




...{


get




...{


if (this.lblFilter.Text == "")


return "";


else


return this.lblFilter.Text;


}


set




...{


this.lblFilter.Text = value;


}


}


public delegate void ButtonClickEventHandler(object sender, System.EventArgs e);


//public event ButtonClickEventHandler SelClick;


public delegate void eventhandler(object sender, EventArgs e);


//public event eventhandler CalClick;


}



另外，本用户控件还需要调用后台的类库，进行一些业务逻辑上的处理代码如下：


using System;


using System.Collections.Generic;


using System.Text;


using System.Web.UI.WebControls;


using System.Data;


using System.Data.SqlClient;




namespace WebClass




...{




/**//// <summary>


/// 高级查询


/// 书写人：AAA


/// 创建日期：2006-08-28


/// </summary>


public class Query:DBClass.DBClass




...{




/**//// <summary>


/// 当前的窗体名称


/// </summary>


private string _strQueryForm;




/**//// <summary>


/// 构造函数


/// </summary>


/// <param name="QueryForm">高级查询对应的窗体</param>


/// <param name="ECode">当前的企业编号</param>


public Query (string QueryForm)




...{


_strQueryForm = QueryForm;


}




/**//// <summary>


/// 获取当前窗体对应的筛选内容的数据集


/// </summary>


/// <returns>数据集</returns>


public DataSet DataSet_Content()




...{


string mysql = string.Format("SELECT By_Name,Field FROM Advance_Query WHERE form='{0}'", this._strQueryForm);




return base.ExecuteSqlDs(mysql, "Content");


}




/**//// <summary>


/// 设置筛选条件


/// </summary>


/// <param name="content">当前筛选内容的Value值</param>


/// <param name="ddlCondition">当前筛选条件对应的下拉框控件的ID</param>


public void Set_Condition(string content,DropDownList ddlCondition)




...{


switch (Get_Content_Type(content))




...{


case "S":


switch (Get_Content_Flag(content))




...{


case "1":


ddlCondition.Items.Clear();


ddlCondition.Items.Add(new ListItem("包含", " = "));


break;


case "0":


ddlCondition.Items.Clear();


ddlCondition.Items.Add(new ListItem("包含", " = "));


ddlCondition.Items.Add(new ListItem("不包含", " <> "));


break;


}


break;


case "D":


ddlCondition.Items.Clear();


ddlCondition.Items.Add(new ListItem("等于", " = "));


ddlCondition.Items.Add(new ListItem("大于", " > "));


ddlCondition.Items.Add(new ListItem("大于等于", " >= "));


ddlCondition.Items.Add(new ListItem("小于", " < "));


ddlCondition.Items.Add(new ListItem("小于等于", " <= "));


ddlCondition.Items.Add(new ListItem("不等于", " <> "));


break;


case "N":


ddlCondition.Items.Clear();


ddlCondition.Items.Add(new ListItem("等于", " = "));


ddlCondition.Items.Add(new ListItem("大于", " > "));


ddlCondition.Items.Add(new ListItem("大于等于", " >= "));


ddlCondition.Items.Add(new ListItem("小于", " < "));


ddlCondition.Items.Add(new ListItem("小于等于", " <= "));


ddlCondition.Items.Add(new ListItem("不等于", " <> "));


break;


}


}




/**//// <summary>


/// 获取当前筛选内容对应的类型


/// 注：D:日期类型 N:数值类型 S:字符类型


/// </summary>


/// <param name="content">当前筛选内容的Value值</param>


/// <returns>筛选内容的类型</returns>


private string Get_Content_Type(string content)




...{


string strSql = string.Format("SELECT Type FROM Advance_Query WHERE Form='{0}' AND Field='{1}'",


this._strQueryForm,content);


return base.ExecuteSqlValue(strSql).ToString();


}




/**//// <summary>


/// 获取当前筛选内容对应的筛选范围


/// </summary>


/// <param name="content">当前筛选内容的Value值</param>


/// <returns>数据集</returns>


public DataSet DataSet_Area(string content)




...{


if (Get_Content_Flag(content)=="0")




...{


string strSql = string.Format("SELECT AreaSQL FROM Advance_Query WHERE Form='{0}' AND Field='{1}'",


this._strQueryForm,content);


return base.ExecuteSqlDs(base.ExecuteSqlValue(strSql).ToString(),"area");


}


else


return null;


}




/**//// <summary>


/// 获取筛选内容对应的标记


/// 注：0：利用的是下拉框；1：利用的是文本框


/// </summary>


/// <param name="content">当前选择的筛选内容的Value值</param>


/// <returns>字符串 0：利用的是下拉框；1：利用的是文本框</returns>


public string Get_Content_Flag(string content)




...{


//查询语句，判断数据库中该字段对应的标志信息


string strSql = string.Format("SELECT Flag From Advance_Query WHERE Form='{0}' AND Field='{1}'",


this._strQueryForm,content);


return base.ExecuteSqlValue(strSql).ToString();


}




/**//// <summary>


/// 获取筛选字符串


/// </summary>


/// <param name="content">筛选内容</param>


/// <param name="Condition">筛选条件</param>


/// <param name="myValue">筛选范围</param>


/// <returns>字符串</returns>


public string Filter(string content, string Condition, string myValue)




...{


switch (Get_Content_Type(content))




...{


case "S":




...{


if (this.Get_Content_Flag(content) == "0")




...{//当为下拉框时，进行全匹配


return string.Format("{0}{1}'{2}'", content, Condition, myValue);


}


else




...{//当为文本框时，进行内容部分匹配


return string.Format("{0} LIKE '%{1}%'", content, myValue);


}


}


case "N":


return string.Format("{0}{1}{2}", content,Condition,myValue);


case "D":


return string.Format("{0}{1}'{2}'", content,Condition,myValue);


default:


return string.Format("{0}{1}'{2}'", content,Condition,myValue);


}


}




/**//// <summary>


/// 获取进行查询的表名称


/// </summary>


/// <param name="content">筛选内容</param>


/// <returns>需要进行查询的表名称</returns>


private string Get_Tabel_Name(string content)




...{


string strSql = string.Format("SELECT tbl FROM Advance_Query WHERE FORM='{0}' AND field='{1}'", this._strQueryForm, content);


return base.ExecuteSqlValue(strSql).ToString();


}




/**//// <summary>


/// 获取DateView


/// </summary>


/// <returns></returns>


public DataView Dv_SQl(string content)




...{


return base.ExecuteSqlDs(string.Format("SELECT * FROM {0}", this.Get_Tabel_Name(content)),"SR_EOS").Tables[0].DefaultView;


}


}


}



在本类库需要调用最基层的DBClass，是对数据库的最基村的操作，主要是进行读取数据，获取数据集的操作，在这里，不做详细书写。
经过编译成功后，新建网页，将此用户控件拖动到需要进行的页面。进行以下的编码，主要是设置GridView控件的ID,数据源注意使DataView，在这里可以将DataSet转换成DataView,可以在页面上一个按钮,高级查询，单击后，加载用户控件如下图所示：



我们可以看到，在它的下面是个GridView控件
这后我们对PageLoad,和图片中的高级查询按钮进行编写代码，如下：


public WebClass.Customer myCustomer = new WebClass.Customer();


protected void Page_Load(object sender, EventArgs e)




...{


if (!Page.IsPostBack)




...{


this.tvCustomer.Nodes.Add(new WebClass.TreeShow().CustomerType());


this.gvCustomer.DataSource = myCustomer.DataSet_Customer();


this.gvCustomer.DataBind();


gvStat.DataSource = myCustomer.DataSet_Customer_Stat();


gvStat.DataBind();


this.btnAdd.Attributes.Add("OnClick", "window.showModalDialog('customeradd.aspx'),'','resizable:yes;status:no;'");


}


Advance_Query1.strForm = "Customer";


Advance_Query1.GridViewID = this.gvCustomer;


Advance_Query1.DataSource = this.dv("");


}


... ...


protected void btnAdvSel_Click(object sender, EventArgs e)




...{


if (this.Panel1.Visible)




...{


this.Panel1.Visible = false;


this.btnAdvSel.Text = "显示高级查询";


this.gvCustomer.DataSource = myCustomer.DataSet_Customer();


this.gvCustomer.DataBind();


}


else




...{


this.Panel1.Visible = true;


this.btnAdvSel.Text = "隐藏高级查询";


}


}

注：本高级查询的配置信息存储在数据表中（Advance_Query）：


DROP TABLE Advance_Query;


CREATE TABLE Advance_Query


(


Tbl VARCHAR2(30) NOT NULL, --表名称 PK


Form VARCHAR2(30) NOT NULL, --所属窗体名称 pk


Field VARCHAR2(30) NOT NULL, --字段名称 pk


By_Name VARCHAR2(30) NOT NULL, --字段别名


Type VARCHAR2(1) NOT NULL, --字段类型名称


Flag VARCHAR2(1) NOT NULL, --标示 0：利用下拉框 1：用文本框


AreaSQL VARCHAR2(150), --当前值对应的查询语句 适合于：flag=0时使用


CONSTRAINT PK_Text PRIMARY KEY(Tbl,Form,Field)


);

这样，运行的你的页面，就可以做到高级查询。