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修改和删除DataGrid行——数据库访问


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关键字:ASP.NET 2006-8-31

 

本程序涉及到数据库的添加,修改和删除操作。
 
懒得写了,把界面贴出来,照着界面画就可以了。本例数据库:SqlServer2000附带的pubs数据库,看一下连接字符串就很清楚了。如果要在本机器上运行,把uid和pwd改成你自己SQL登陆用户名和密码。
 
创建一个WEB页面,命名为:Add.aspx。
界面设计如图:
 
Add.aspx代码:
<%@ Page language="c#" Codebehind="Add.aspx.cs" AutoEventWireup="false" Inherits="TeachShow.Charpter7.AccessDataBase.Add" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>Add</title>
<LINK href="../../Style.css" type="text/css" rel="stylesheet">
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<div align="center">
<center>
<table class="smallBlack" height="318" cellSpacing="0" cellPadding="0" width="429" border="0">
<tr>
<td class="title" vAlign="top" width="429" colSpan="2" height="31">添加一个新的发行者</td>
</tr>
<tr>
<td vAlign="top" width="79" height="23">发行者ID:</td>
<td vAlign="top" width="350" height="23"><asp:textbox id="TextBox1" runat="server" Height="18px" CssClass="smallRed"></asp:textbox><FONT face="宋体">(以99打头,共4位数字)</FONT></td>
</tr>
<tr>
<td vAlign="top" width="79" height="23"><FONT face="宋体">姓名:</FONT></td>
<td vAlign="top" width="350" height="23"><asp:textbox id="TextBox2" runat="server" Height="18px" CssClass="smallRed"></asp:textbox></td>
</tr>
<tr>
<td vAlign="top" width="79" height="23"><FONT face="宋体">城市:</FONT></td>
<td vAlign="top" width="350" height="23"><asp:textbox id="TextBox3" runat="server" Height="18px" CssClass="smallRed"></asp:textbox></td>
</tr>
<tr>
<td vAlign="top" width="79" height="23"><FONT face="宋体">省份:</FONT></td>
<td vAlign="top" width="350" height="23"><asp:textbox id="TextBox4" runat="server" Height="18px" CssClass="smallRed"></asp:textbox><FONT face="宋体">(2个字符)</FONT></td>
</tr>
<tr>
<td vAlign="top" width="79" height="24"><FONT face="宋体">国家:</FONT></td>
<td vAlign="top" width="350" height="24"><asp:textbox id="TextBox5" runat="server" Height="18px" CssClass="smallRed"></asp:textbox></td>
</tr>
<tr>
<td vAlign="top" align="center" width="429" colSpan="2" height="24"><asp:linkbutton id="LinkButton1" runat="server">提交到数据库</asp:linkbutton></td>
</tr>
<tr>
<td width="429" height="147" valign="top" colspan="2">
<asp:DataGrid id="DataGrid1" runat="server" Height="120px" CssClass="general" Width="428px">
<ItemStyle Width="50px"></ItemStyle>
<Columns>
<asp:EditCommandColumn ButtonType="LinkButton" UpdateText="更新" CancelText="取消" EditText="编辑">
<HeaderStyle Width="60px"></HeaderStyle>
</asp:EditCommandColumn>
<asp:ButtonColumn Text="删除" CommandName="Delete"></asp:ButtonColumn>
</Columns>
</asp:DataGrid></td>
</tr>
</table>
</center>
</div>
</form>
</body>
</HTML>
 
Add.asp.cs代码:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
 
namespace TeachShow.Charpter7.AccessDataBase
{
/// <summary>
/// Add 的摘要说明。
/// </summary>
public class Add : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.TextBox TextBox2;
protected System.Web.UI.WebControls.TextBox TextBox3;
protected System.Web.UI.WebControls.TextBox TextBox4;
protected System.Web.UI.WebControls.LinkButton LinkButton1;
protected System.Web.UI.WebControls.DataGrid DataGrid1;
protected System.Web.UI.WebControls.TextBox TextBox5;
 
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!this.IsPostBack)
{
this.BindGrid();
}
}
 
#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
 
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.LinkButton1.Click += new System.EventHandler(this.LinkButton1_Click);
this.DataGrid1.Disposed += new System.EventHandler(this.DataGrid1_Disposed);
this.DataGrid1.CancelCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_CancelCommand);
this.DataGrid1.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_EditCommand);
this.DataGrid1.UpdateCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_UpdateCommand);
this.DataGrid1.DeleteCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_DeleteCommand);
this.DataGrid1.SelectedIndexChanged += new System.EventHandler(this.DataGrid1_SelectedIndexChanged);
this.Load += new System.EventHandler(this.Page_Load);
 
}
#endregion
 
private void LinkButton1_Click(object sender, System.EventArgs e)
{
AddPublisher();
}
 
/// <summary>
/// 添加
/// </summary>
private void AddPublisher()
{
string sql="insert into publishers(pub_id,pub_name,city,state,country) values(@pubid,@pubname,@city,@state,@country)";
 
SqlConnection con=new SqlConnection("server=accp-lzh;uid=sa;pwd=sasa;database=pubs");
SqlCommand cmd=new SqlCommand(sql,con);
 
cmd.Parameters.Add(new SqlParameter("@pubid",SqlDbType.Char,4));
cmd.Parameters["@pubid"].Value=this.TextBox1.Text;
cmd.Parameters.Add(new SqlParameter("@pubname",SqlDbType.VarChar ,40));
cmd.Parameters["@pubname"].Value=this.TextBox2.Text;
cmd.Parameters.Add(new SqlParameter("@city",SqlDbType.Char,20));
cmd.Parameters["@city"].Value=this.TextBox3.Text;
cmd.Parameters.Add(new SqlParameter("@state",SqlDbType.Char,2));
cmd.Parameters["@state"].Value=this.TextBox4.Text;
cmd.Parameters.Add(new SqlParameter("@country",SqlDbType.VarChar ,30));
cmd.Parameters["@country"].Value=this.TextBox5.Text;
 
cmd.Connection.Open();
cmd.ExecuteNonQuery();
cmd.Connection.Close();
 
this.TextBox1.Text="";
this.TextBox2.Text="";
this.TextBox3.Text="";
this.TextBox4.Text="";
this.TextBox5.Text="";
 
this.BindGrid();
}
 
private void BindGrid()
{
SqlConnection con=new SqlConnection("server=accp-lzh;uid=sa;pwd=sasa;database=pubs");
SqlDataAdapter mysqlcom=new SqlDataAdapter("select * from publishers where pub_id like '99%'",con);
DataSet myds=new DataSet();
mysqlcom.Fill(myds,"publishers");
this.DataGrid1.DataSource=myds.Tables["publishers"].DefaultView ;
this.DataGrid1.DataBind();
}
 
/// <summary>
/// 点击编辑时触发事件
/// </summary>
/// <param name="source"></param>
/// <param name="e"></param>
private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
this.DataGrid1.EditItemIndex=(int)e.Item.ItemIndex;
this.BindGrid();
}
 
/// <summary>
/// 点击取消时触发该事件。
/// </summary>
/// <param name="source"></param>
/// <param name="e"></param>
private void DataGrid1_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
this.DataGrid1.Columns[0].HeaderText="已取消";
this.DataGrid1.EditItemIndex=-1;
this.BindGrid();
}
 
private void DataGrid1_SelectedIndexChanged(object sender, System.EventArgs e)
{
 
}
 
/// <summary>
/// 点击更新时触发该事件。
/// </summary>
/// <param name="source"></param>
/// <param name="e"></param>
private void DataGrid1_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
SqlConnection con=new SqlConnection("server=accp-lzh;uid=sa;pwd=sasa;database=pubs");
SqlCommand selectCmd=con.CreateCommand();
selectCmd.CommandType=CommandType.Text;
selectCmd.CommandText="select * from publishers where pub_id like '99%'";
 
SqlDataAdapter sqlAdatper=new SqlDataAdapter();
sqlAdatper.SelectCommand=selectCmd;
DataSet ds=new DataSet();
con.Open();
sqlAdatper.Fill(ds,"publishers");
con.Close();
 
SqlCommand updateCmd=con.CreateCommand();
updateCmd.CommandText="update publishers set pub_name=@pubname,city=@city,state=@state,country=@country where pub_id=@pub_id";
SqlParameter PubNamePar=new SqlParameter("@pubname",SqlDbType.VarChar,40,"pub_name");
updateCmd.Parameters.Add(PubNamePar);
SqlParameter CityPar=new SqlParameter("@city",SqlDbType.VarChar,20,"city");
updateCmd.Parameters.Add(CityPar);
SqlParameter StatePar=new SqlParameter("@state",SqlDbType.Char,2,"state");
updateCmd.Parameters.Add(StatePar);
SqlParameter CountryPar=new SqlParameter("@country",SqlDbType.VarChar,30,"country");
updateCmd.Parameters.Add(CountryPar);
SqlParameter PubIDPar=new SqlParameter("@pub_id",SqlDbType.Char,4,"pub_id");
PubIDPar.SourceVersion=DataRowVersion.Original;
updateCmd.Parameters.Add(PubIDPar);
 
sqlAdatper.UpdateCommand=updateCmd;
 
DataTable table=ds.Tables["publishers"];
table.PrimaryKey=new DataColumn[]
{
table.Columns["pub_id"]
};
DataRow row=table.Rows.Find(((TextBox)(e.Item.Cells[2].Controls[0])).Text);
row["pub_name"]=((TextBox)(e.Item.Cells[3].Controls[0])).Text;
row["city"]=((TextBox)(e.Item.Cells[4].Controls[0])).Text;
row["state"]=((TextBox)(e.Item.Cells[5].Controls[0])).Text;
row["country"]=((TextBox)(e.Item.Cells[6].Controls[0])).Text;
 
con.Open();
sqlAdatper.Update(table);
con.Close();
 
this.DataGrid1.EditItemIndex=-1;
this.BindGrid();
}
 
/// <summary>
/// 点击删除时触发该事件
/// </summary>
/// <param name="source"></param>
/// <param name="e"></param>
private void DataGrid1_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
SqlConnection con=new SqlConnection("server=accp-lzh;uid=sa;pwd=sasa;database=pubs");
SqlCommand selectCmd=con.CreateCommand();
selectCmd.CommandText="select * from publishers where pub_id like '99%'";
 
SqlCommand deleteCmd=con.CreateCommand();
deleteCmd.CommandText="delete from publishers where pub_id=@pub_id";
SqlParameter PubIdPar=new SqlParameter("@pub_id",SqlDbType.Char,4,"pub_id");
PubIdPar.SourceVersion=DataRowVersion.Original;
deleteCmd.Parameters.Add(PubIdPar);
 
SqlDataAdapter sqlAdapter=new SqlDataAdapter();
sqlAdapter.SelectCommand=selectCmd;
sqlAdapter.DeleteCommand=deleteCmd;
 
DataSet ds=new DataSet();
con.Open();
sqlAdapter.Fill(ds,"publishers");
DataTable table=new DataTable();
table=ds.Tables["publishers"];
table.PrimaryKey=new DataColumn[]//定义主键,便于查找
{
table.Columns["pub_id"]
};
DataRow row=table.Rows.Find(e.Item.Cells[2].Text);
row.Delete();
sqlAdapter.Update(table);
con.Close();
 
this.DataGrid1.EditItemIndex=-1;
this.BindGrid();
}
 
private void DataGrid1_Disposed(object sender, System.EventArgs e)
{
 
}
}
}

修改和删除DataGrid行——数据库访问

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修改和删除DataGrid行——数据库访问 num

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