C#连接Access数据库的一个登陆程序源代码.doc

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Data.OleDb;namespace MyAccessConnectionTest public partial class Form1 : Form Form2 ShowInformationForm; public Form1() InitializeComponent(); private void button1_Click(object sender, EventArgs e) /接收文本框中输入的用户信息 string UserIDSave=textBox1 .Text.ToString () ; string UserKeySave=textBox2 .Text.ToString () ; /创建连接access数据库的连接字符串 string ConnectionWords = Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:UserslearicDesktopMyAccessConnectionTest.mdb; /连接数据库 OleDbConnection MyAccessConnect = new OleDbConnection(ConnectionWords); /打开数据库 MyAccessConnect.Open(); /数据库命令字符串 string CommandString = string.Format(SELECT UserID,UserKey FROM UserLogTable WHERE (UserLogTable.UserID=0) AND (UserLogTable.UserKey=1), UserIDSave, UserKeySave); /string CommandString = SELECT UserID,UserKey FROM UserLogTable WHERE UserID= + UserIDSave + AND UserKey= + UserKeySave + ; /string CommandString = SELECT UserID,UserKey FROM UserLogTable WHERE UserID= + UserIDSave + AND UserKey= + UserKeySave + ; /string CommandString = SELECT Count(*) FROM UserLogTable WHERE UserID= + UserIDSave + AND UserKey= + UserKeySave + ; /string CommandString = string.Format(select UserID,UserKey from UserLogTable where UserID=0); /OleDbCommand Cmd = new OleDbCommand(CommandString ,MyAccessConnect ); OleDbCommand Cmd = MyAccessConnect.CreateCommand(); /OleDbTransaction transaction = null; /transaction = MyAccessConnect.BeginTransaction(); /Cmd.Transaction = transaction; Cmd.CommandText = CommandString; /transaction.Commit(); /Access数据库适配器 OleDbDataAdapter GetInformationFromAccess = new OleDbDataAdapter(Cmd); /创建一个Access表空间 DataSet TempTable = new DataSet(); /将适配器中取出的信息存储到计算机中创建的表空间中去 GetInformationFromAccess.Fill(TempTable); /OleDbDataReader ReadMyaccess = Cmd.ExecuteReader(); /关闭数据库 MyAccessConnect.Close(); /if (ReadMyaccess.Read() = true) / / if (ReadMyaccess.GetInt32(0) 0) / / this.Hide(); / this.ShowInformationForm = new Form2(); / this.ShowInformationForm.ShowInformation.Text = 登录成功; / this.ShowInformationForm.ShowDialog(); / this.Dispose(); / / else / / this.Hide(); / this.ShowInformationForm = new Form2(); / this.ShowInformationForm.ShowInformation.Text = 用户名或者密码错误; / this.ShowInformationForm.ShowDialog(); / this.Dispose(); / / /else / / this.Hide(); / this.ShowInformationForm = new Form2(); / this.ShowInformationForm.ShowInformation.Text = 用户未注册; / this.ShowInformationForm.ShowDialog(); / this.textBox1.Text = ; / this.textBox2.Text = ; / this.ShowInformationForm.ShowDialog(); / this.Show(); / /ReadMyaccess.Close(); /判断创建的数据库表是否为空从而判断数据库中是否有该信息 if (TempTable != null & TempTable.Tables0.Rows.Count 0) this.Hide(); this.ShowInformationForm = new Form2(); this.ShowInformationForm.ShowInformation.Text = TempTable.Tables0.Rows0UserID.ToString(); this.ShowInformationForm.ShowDialog(); this.Dispose(); else this.Hide(); this.ShowInformationForm = new Form2(); this.ShowInformationForm.ShowInformation.Text = 登录失败; this.ShowI