[转载](ASP.NET)修改和删除DataGrid行——数据库访问
(ASP.NET)修改和删除DataGrid行——数据库访问
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" %>
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
{
///
/// Add 的摘要说明。
///
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);
}
///
/// 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。
///
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();
}
///
/// 添加
///
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();
}
///
/// 点击编辑时触发事件
///
///
///
private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
this.DataGrid1.EditItemIndex=(int)e.Item.ItemIndex;
this.BindGrid();
}
///
/// 点击取消时触发该事件。
///
///
///
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)
{
}
///
/// 点击更新时触发该事件。
///
///
///
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();
}
///
/// 点击删除时触发该事件
///
///
///
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)
{
}
}
}
下面是修改时的截图: