| 作者：徐长友 主页:http://yousoft.hi.com.cn本文主要介绍用C# Builder通过ODBC访问数据。并将数据导出到Excel,下面以C# Builder Enterprise+Microsoft Access 2000+Microsoft Excel 2000为例。1.建立数据库mydb，内建一表：联系人联系人ID名字姓氏地址城市省份 [ 相关贴图 ]2.建立ODBC(mydb)3.编写程序点击菜单 File - New - C# Application,输入应用程序名称 [ 相关贴图 ] [ 相关贴图 ]如果还没有安装ODBC组件，你还需要装上它们。点击菜单Component - Installed .Net components，在Installed .Net components窗口中确定ODBC组件已经选上。确定后，看tool Palette上是否有ODBC几个组件在上面。图示 [ 相关贴图 ] [ 相关贴图 ]加上一个OdbcConnection和一个OdbcCommand [ 相关贴图 ]选中odbcConnection1，在ConnectionString输入：DSN=mydb;Uid=admin;Pwd=;选中odbcCommand1,Connection选择odbcConnection1,CommandText输入：select * from 联系人 WinForm窗口加上两个Button和ListBox，其中ListBox的Dock设为Bottom双击按钮，输入代码： listBox1.Items.Clear(); odbcConnection1.Open(); OdbcDataReader myreader=odbcCommand1.ExecuteReader(); try{ while (myreader.Read()) { listBox1.Items.Add(myreader.GetString(0)+","+myreader.GetString(1)+" "+myreader.GetString(2)); } } finally{ myreader.Close(); odbcConnection1.Close(); }对于.NET对ODBC的一些使用方法，可以查看帮助。上面写得很详细。 [ 相关贴图 ]通过Com组件来完成数据导出Excel：为了在C#中使用Excel，我们要先做一点准备工作，在你的计算机中找到TlbImp和Excel9.olb，将他们复制到一个文件夹中，在DOS窗口中执行 TlbImp Excel9.olb，这时会产生以下三个文件：Excel.dll、Office.dll和VBIDE.dll。通过菜单 project->Add reference ，弹出的对话框中选择COM imports，点击Browser按钮,选中前面生成的三个DLL文件，OK导出代码如下： //创建一个Excel文件 int i; Excel.Application myExcel = new Excel.Application ( ) myExcel.Application.Workbooks.Add ( true ) //让Excel文件可见 myExcel.Visible=true; //第一行为报表名称 myExcel.Cells[1,4]="联系人"; myExcel.Cells[2,1]="联系人ID"; myExcel.Cells[2,2]="名字"; myExcel.Cells[2,3]="姓氏"; myExcel.Cells[2,4]="地址"; myExcel.Cells[2,5]="城市"; myExcel.Cells[2,6]="省份"; //逐行写入数据， listBox1.Items.Clear(); odbcConnection1.Open(); OdbcDataReader myreader=odbcCommand1.ExecuteReader(); try{ i=2; while (myreader.Read()) { i=i+1; myExcel.Cells[i,1]=myreader.GetString(0); myExcel.Cells[i,2]=myreader.GetString(1); myExcel.Cells[i,3]=myreader.GetString(2); myExcel.Cells[i,4]=myreader.GetString(3); myExcel.Cells[i,5]=myreader.GetString(4); myExcel.Cells[i,6]=myreader.GetString(5); } } finally{ myreader.Close(); odbcConnection1.Close(); }程序完整的代码如下：using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using System.Data.Odbc;using System.IO;using System.Reflection;namespace DBApp{ /// <summary> /// Summary description for WinForm. /// </summary> public class WinForm : System.Windows.Forms.Form { /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.Container components = null; private System.Data.Odbc.OdbcConnection odbcConnection1; private System.Data.Odbc.OdbcCommand odbcCommand1; private System.Windows.Forms.ListBox listBox1; private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; public WinForm() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } /// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose (bool disposing) { if (disposing) { if (components != null) { components.Dispose(); } } base.Dispose(disposing); } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.odbcConnection1 = new System.Data.Odbc.OdbcConnection(); this.listBox1 = new System.Windows.Forms.ListBox(); this.button1 = new System.Windows.Forms.Button(); this.odbcCommand1 = new System.Data.Odbc.OdbcCommand(); this.button2 = new System.Windows.Forms.Button(); this.SuspendLayout(); // // odbcConnection1 // this.odbcConnection1.ConnectionString = "DSN=mydb;Uid=admin;Pwd=;"; // // listBox1 // this.listBox1.Dock = System.Windows.Forms.DockStyle.Bottom; this.listBox1.ItemHeight = 12; this.listBox1.Location = new System.Drawing.Point(0, 53); this.listBox1.Name = "listBox1"; this.listBox1.Size = new System.Drawing.Size(368, 184); this.listBox1.TabIndex = 0; // // button1 // this.button1.Location = new System.Drawing.Point(16, 16); this.button1.Name = "button1"; this.button1.TabIndex = 1; this.button1.Text = "查询"; this.button1.Click += new System.EventHandler(this.button1_Click); // // odbcCommand1 // this.odbcCommand1.CommandText = "select * from 联系人 "; this.odbcCommand1.Connection = this.odbcConnection1; // // button2 // this.button2.Location = new System.Drawing.Point(245, 14); this.button2.Name = "button2"; this.button2.TabIndex = 2; this.button2.Text = "导出"; this.button2.Click += new System.EventHandler(this.button2_Click); // // WinForm // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(368, 237); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.Controls.Add(this.listBox1); this.Name = "WinForm"; this.Text = "WinForm"; this.Load += new System.EventHandler(this.WinForm_Load); this.ResumeLayout(false); } #endregion /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.Run(new WinForm()); } private void WinForm_Load(object sender, System.EventArgs e) { } private void button1_Click(object sender, System.EventArgs e) { listBox1.Items.Clear(); odbcConnection1.Open(); OdbcDataReader myreader=odbcCommand1.ExecuteReader(); try{ while (myreader.Read()) { listBox1.Items.Add(myreader.GetString(0)+","+myreader.GetString(1)+" "+myreader.GetString(2)); } } finally{ myreader.Close(); odbcConnection1.Close(); } } private void button2_Click(object sender, System.EventArgs e) { //创建一个Excel文件 int i; Excel.Application myExcel = new Excel.Application ( ) myExcel.Application.Workbooks.Add ( true ) //让Excel文件可见 myExcel.Visible=true; //第一行为报表名称 myExcel.Cells[1,4]="联系人"; myExcel.Cells[2,1]="联系人ID"; myExcel.Cells[2,2]="名字"; myExcel.Cells[2,3]="姓氏"; myExcel.Cells[2,4]="地址"; myExcel.Cells[2,5]="城市"; myExcel.Cells[2,6]="省份"; //逐行写入数据， listBox1.Items.Clear(); odbcConnection1.Open(); OdbcDataReader myreader=odbcCommand1.ExecuteReader(); try{ i=2; while (myreader.Read()) { i=i+1; myExcel.Cells[i,1]=myreader.GetString(0); myExcel.Cells[i,2]=myreader.GetString(1); myExcel.Cells[i,3]=myreader.GetString(2); myExcel.Cells[i,4]=myreader.GetString(3); myExcel.Cells[i,5]=myreader.GetString(4); myExcel.Cells[i,6]=myreader.GetString(5); } } finally{ myreader.Close(); odbcConnection1.Close(); } } }}4.运行程序按F9运行程序 [ 相关贴图 ] [ 相关贴图 ]示例代码： [ 点击下载 ] |
