如何使用DataSet更新数据库??
我想通过DataSet更新数据库,可是程序执行后没起作用,请高手指点一下,看我哪里弄错了。 谢谢
我的程序很简单,整个代码如下:(我是想把tab1表里的数据全部覆盖到tab2里,这两个表在两个数据库中)
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.OracleClient;
namespace DSCopy
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows 窗体设计器生成的代码
/// <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.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(336, 48);
this.button1.Name = "button1";
this.button1.TabIndex = 0;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(880, 526);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void button1_Click(object sender, System.EventArgs e)
{
string ConnectionString1 = "Data Source=mydb1;user=myuser;password=mypasswd;";
string ConnectionString2 = "Data Source=mydb2;user=myuser;password=mypasswd;";
string Sql1 = "select * from tab1";
string Sql2 = "select * from tab2";
DataSet dataset1 = new DataSet();
DataSet dataset2 = new DataSet();
OracleConnection conn1 = new OracleConnection(ConnectionString1);
OracleConnection conn2 = new OracleConnection(ConnectionString2);
OracleDataAdapter adapter1 = new OracleDataAdapter();
OracleDataAdapter adapter2 = new OracleDataAdapter();
adapter1.SelectCommand = new OracleCommand(Sql1, conn1);
conn1.Open();
adapter1.Fill(dataset1, "aaa");
adapter2.SelectCommand = new OracleCommand(Sql2, conn2);
conn2.Open();
adapter2.Fill(dataset2, "bbb");
adapter2.Update(dataset1, "aaa");
conn1.Close();
conn2.Close();
}
}
}