发信人: cataract (大瀑布来啦), 信区: DotNET
标 题: 用Visual C＃来增加数据记录(1)
发信站: BBS 水木清华站 (Mon Dec 10 18:12:58 2001)
发信人: xixixi (wenwen), 信区: dotNET
标 题: 用Visual C＃来增加数据记录(1)
发信站: 飘渺水云间 (Sun Dec 9 21:13:10 2001), 转信
在本篇文章中，我们将介绍Visual C#对数据库的一个基本操作，即：如何往数据
库中
添加记录。我们将通过一些数据库操作的例子，来具体说明一下。为了更清楚的说
明这
个问题，在选用数据库方面采用了二种当前比较典型的数据库，其一是本地数据库
--Ac
cess 2000，另外一个是远程数据库--SQL SERVER 7.0。首先介绍如何用Visual
C#来添
加Access 2000数据库的记录。
一．用Visual C#来添加Access 2000数据库的记录
（一）.程序设计和运行的环境设置：
（1）视窗2000服务器版
（2）Microsoft Data Acess Component 2.6 以上版本 ( MDAC 2.6 )
（3）本文程序使用的数据库的介绍：
程序中使用的数据库名称为sample.mdb，在此数据库中有一张数据表books。此数
据表的
结构如下：
字段名称 字段类型 代表意思
Bookid 数字 序号
booktitle 文本 书籍名称
bookauthor 文本 书籍作者
bookprice 数字 价格
bookstock 数字 书架号
（二）.程序设计难点和应该注意的问题：
如何正确的往数据库中添加记录是本文要讨论的一个重点和难点，下面就是解决这
一问
题的具体思路：
（1）创建并打开一个 OleDbConnection对象。
（2）创建一个插入一条记录的SQL语句。
（3）创建一个OleDbCommand对象。
（4）通过此OleDbCommand对象完成对插入一条记录到数据库的操作。
以下是在程序中实现的具体语句：
string strConn = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =
sample
.mdb " ;
OleDbConnection myConn = new OleDbConnection ( strConn ) ;
myConn.Open ( ) ;
string strInsert = " INSERT INTO books ( bookid , booktitle , bookauthor
, b
ookprice , bookstock ) VALUES ( " ;
strInsert += t_bookid.Text + ", '" ;
strInsert += t_booktitle.Text + "', '" ;
strInsert += t_bookauthor.Text + "', " ;
strInsert += t_bookprice.Text + ", " ;
strInsert += t_bookstock.T
bookauthor 文本 书籍作者
bookprice 数字 价格
bookstock 数字 书架号
（二）.程序设计难点和应该注意的问题：
如何正确的往数据库中添加记录是本文要讨论的一个重点和难点，下面就是解决这
一问
题的具体思路：
（1）创建并打开一个 OleDbConnection对象。
（2）创建一个插入一条记录的SQL语句。
（3）创建一个OleDbCommand对象。
（4）通过此OleDbCommand对象完成对插入一条记录到数据库的操作。
以下是在程序中实现的具体语句：
string strConn = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =
sample
.mdb " ;
OleDbConnection myConn = new OleDbConnection ( strConn ) ;
myConn.Open ( ) ;
string strInsert = " INSERT INTO books ( bookid , booktitle , bookauthor
, b
ookprice , bookstock ) VALUES ( " ;
strInsert += t_bookid.Text + ", '" ;
strInsert += t_booktitle.Text + "', '" ;
strInsert += t_bookauthor.Text + "', " ;
strInsert += t_bookprice.Text + ", " ;
strInsert += t_bookstock.Text + ")" ;
OleDbCommand inst = new OleDbCommand ( strInsert , myConn ) ;
inst.ExecuteNonQuery ( ) ;
myConn.Close ( ) ;
（三）.用Visual C#来插入记录的程序源代码( add.cs )和执行后的界面：
下图是add.cs编译后的执行界面：
add.cs源程序代码：
using System ;
using System.Drawing ;
using System.ComponentModel ;
using System.Windows.Forms ;
using System.Data.OleDb ;
using System.Data ;
//导入程序中使用到的名称空间
public class DataAdd : Form {
private Button lastrec ;
private Button nextrec ;
private Button previousrec ;
private Button firstrec ;
private Container components ;
private Label title ;
private Button t_new ;
private Button save ;
private TextBox t_bookstock ;
private TextBox t_bookprice ;
private TextBox t_bookauthor ;
private TextBox t_booktitle ;
下图是add.cs编译后的执行界面：
add.cs源程序代码：
using System ;
using System.Drawing ;
using System.ComponentModel ;
using System.Windows.Forms ;
using System.Data.OleDb ;
using System.Data ;
//导入程序中使用到的名称空间
public class DataAdd : Form {
private Button lastrec ;
private Button nextrec ;
private Button previousrec ;
private Button firstrec ;
private Container components ;
private Label title ;
private Button t_new ;
private Button save ;
private TextBox t_bookstock ;
private TextBox t_bookprice ;
private TextBox t_bookauthor ;
private TextBox t_booktitle ;
}
public void GetConnected ( )
{
try{
//创建一个 OleDbConnection对象
string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =
sample.
mdb" ;
OleDbConnection myConn = new OleDbConnection ( strCon ) ;
string strCom = " SELECT * FROM books " ;
//创建一个 DataSet
myDataSet = new DataSet ( ) ;
myConn.Open ( ) ;
//用 OleDbDataAdapter 得到一个数据集
OleDbDataAdapter myCommand = new OleDbDataAdapter ( strCom , myConn ) ;
//把Dataset绑定books数据表
myCommand.Fill ( myDataSet , "books" ) ;
//关闭此OleDbConnection
myConn.Close ( ) ;
}
catch ( Exception e )
{
MessageBox.Show ( "连接错误! " + e.ToString ( ) , "错误" ) ;
}
}
private void InitializeComponent ( )
{
components = new System.ComponentModel.Container ( ) ;
nextrec = new Button ( ) ;
lastrec = new Button ( ) ;
previousrec = new Button ( ) ;
firstrec = new Button ( ) ;
t_bookprice = new TextBox ( ) ;
l_booktitle = new Label ( ) ;
l_bookprice = new Label ( ) ;
l_bookauthor = new Label ( ) ;
t_bookid = new TextBox ( ) ;
save = new Button ( ) ;
title = new Label ( ) ;
t_bookauthor = new TextBox ( ) ;
t_booktitle = new TextBox ( ) ;
t_new = new Button ( ) ;
l_bookstock = new Label ( ) ;
t_bookstock = new TextBox ( ) ;
l_bookid = new Label ( ) ;
//以下是对数据浏览的四个按钮进行初始化
firstrec.Location = new System.Drawing.Point ( 65 , 312 ) ;
firstrec.ForeColor = System.Drawing.Color.Black ;
firstrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
firstrec.Font = new System.Drawing.Font("仿宋", 8f );
firstrec.Text = "首记录";
firstrec.Click += new System.EventHandler(GoFirst);
previousrec.Location = new System.Drawing.Point ( 135 , 312 ) ;
previousrec.ForeColor = System.Drawing.Color.Black ;
previousrec.Size = new System.Drawing.Size(40, 24) ;
previousrec.Font = new System.Drawing.Font ( "仿宋" , 8f ) ;
previousrec.Text = "上一条" ;
previousrec.Click += new System.EventHandler ( GoPrevious ) ;
nextrec.Location = new System.Drawing.Point ( 205 , 312 );
nextrec.ForeColor = System.Drawing.Color.Black ;
nextrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
nextrec.Font = new System.Drawing.Font ( "仿宋" , 8f ) ;
nextrec.Text = "下一条" ;
nextrec.Click += new System.EventHandler ( GoNext );
lastrec.Location = new System.Drawing.Point ( 275 , 312 ) ;
lastrec.ForeColor = System.Drawing.Color.Black ;
lastrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
lastrec.Font = new System.Drawing.Font ( "仿宋" , 8f ) ;
lastrec.Text = "尾记录" ;
lastrec.Click += new System.EventHandler ( GoLast ) ;
//以下是对显示标签进行初始化
l_bookid.Location = new System.Drawing.Point ( 24 , 56 ) ;
l_bookid.Text = "书本序号：" ;
l_bookid.Size = new System.Drawing.Size ( 112, 20 ) ;
l_bookid.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
l_bookid.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
l_booktitle.Location = new System.Drawing.Point ( 24 , 108 ) ;
l_booktitle.Text = "书 名：";
l_booktitle.Size = new System.Drawing.Size ( 112 , 20 ) ;
l_booktitle.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
l_booktitle.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
l_bookprice.Location = new System.Drawing.Point ( 24 , 2
nextrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
nextrec.Font = new System.Drawing.Font ( "仿宋" , 8f ) ;
nextrec.Text = "下一条" ;
nextrec.Click += new System.EventHandler ( GoNext );
lastrec.Location = new System.Drawing.Point ( 275 , 312 ) ;
lastrec.ForeColor = System.Drawing.Color.Black ;
lastrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
l_bookstock.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
l_bookstock.TabIndex = 16 ;
l_bookstock.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
l_bookauthor.Location = new System.Drawing.Point ( 24 , 160 ) ;
l_bookauthor.Text = "作 者：" ;
l_bookauthor.Size = new System.Drawing.Size ( 112 , 20 ) ;
l_bookauthor.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
l_bookauthor.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
title.Location = new System.Drawing.Point ( 32 , 16 ) ;
title.Text = "利用Vsiual C#来增加数据记录！" ;
title.Size = new System.Drawing.Size ( 336 , 24 ) ;
title.ForeColor = System.Drawing.Color.Green ;
title.Font = new System.Drawing.Font ( "仿宋" , 14f , System.Drawing.
FontSty
le.Bold ) ;
//以下是对为显示数据记录而设定的标签和文本框进行初始化，并把记录绑定在不
同的
绑定到文本框"Text"属性上
t_bookid.Location = new System.Drawing.Point ( 184 , 56 ) ;
t_bookid.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_bookid.DataBindings.Add ( "Text" , myDataSet , "books.bookid" ) ;
t_bookstock.Location = new System.Drawing.Point ( 184 , 264 ) ;
t_bookstock.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_bookstock.DataBindings.Add ( "Text" , myDataSet , "books.bookstock"
) ;
t_booktitle.Location = new System.Drawing.Point ( 184 , 108 ) ;
t_booktitle.Size = new System.Drawing.Size ( 176 , 20 ) ;
t_booktitle.DataBindings.Add( "Text" , myDataSet , "books.booktitle" )
;
t_bookprice.Location = new System.Drawing.Point ( 184 , 212 ) ;
t_bookprice.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_bookprice.DataBindings.Add ( "Text" , myDataSet , "books.bookprice"
) ;
t_bookauthor.Location = new System.Drawing.Point ( 184 , 160 ) ;
t_bookauthor.Size = new System.Drawing.Size ( 128 , 20 ) ;
t_bookauthor.DataBindings.Add ( "Text" , myDataSet , "books.
bookauthor" ) ;
t_new.Location = new System.Drawing.Point ( 62 , 354 ) ;
t_new.Size = new System.Drawing.Size ( 96 , 32 ) ;
t_new.Text = "新建记录" ;
t_new.Click += new System.EventHandler ( t_newClick ) ;
save.Location = new System.Drawing.Point ( 222 , 354 ) ;
save.Size = new System.Drawing.Size ( 96 , 32 ) ;
save.TabIndex = 4 ;
save.Text = "保存记录" ;
save.Click += new System.EventHandler ( saveClick ) ;
this.Text = "利用Vsiual C#来增加数据记录的程序窗口！" ;
this.AutoScaleBaseSize = new System.Drawing.Size ( 5 , 13 ) ;
thisokstock.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_bookstock.DataBindings.Add ( "Text" , myDataSet , "books.bookstock"
) ;
t_booktitle.Location = new System.Drawing.Point ( 184 , 108 ) ;
t_booktitle.Size = new System.Drawing.Size ( 176 , 20 ) ;
t_booktitle.DataBindings.Add( "Text" , myDataSet , "books.booktitle" )
;
t_bookprice.Location = new System.Drawing.Point ( 184 , 212 ) ;
t_bookprice.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_bookprice.DataBindings.Add ( "Text" , myDataSet , "books.bookprice"
) ;
t_bookauthor.Location = new System.Drawing.Point ( 184 , 160 ) ;
t_bookauthor.Size = new System.Drawing.Size ( 128 , 20 ) ;
t_bookauthor.DataBindings.Add ( "Text" , myDataSet , "books.
bookauthor" ) ;
t_new.Location = new System.Drawing.Point ( 62 , 354 ) ;
t_new.Size = new System.Drawing.Size ( 96 , 32 ) ;
t_new.Text = "新建记录" ;
t_new.Click += new System.EventHandler ( t_newClick ) ;
save.Location = new System.Drawing.Point ( 222 , 354 ) ;
save.Size = new System.Drawing.Size ( 96 , 32 ) ;
save.TabIndex = 4 ;
save.Text = "保存记录" ;
save.Click += new System.EventHandler ( saveClick ) ;
this.Text = "利用Vsiual C#来增加数据记录的程序窗口！" ;
this.AutoScaleBaseSize = new System.Drawing.Size ( 5 , 13 ) ;
this.FormBorderStyle = FormBorderStyle.Fixed3D ;
this.ClientSize = new System.Drawing.Size ( 390 , 400 ) ;
{
try
{
//判断所有字段是否添完，添完则执行，反之弹出提示
if ( t_bookid.Text != "" && t_booktitle.Text != "" &&
this.Controls.Add ( title ) ;
this.Controls.Add ( t_new ) ;
this.Controls.Add ( save ) ;
this.Controls.Add ( t_bookstock ) ;
this.Controls.Add ( t_bookprice ) ;
this.Controls.Add ( t_bookauthor ) ;
this.Controls.Add ( t_booktitle ) ;
this.Controls.Add ( t_bookid ) ;
this.Controls.Add ( l_bookstock ) ;
this.Controls.Add ( l_bookprice ) ;
this.Controls.Add ( l_bookauthor ) ;
this.Controls.Add ( l_booktitle ) ;
this.Controls.Add ( l_bookid ) ;
//把对象DataSet和"books"数据表绑定到此myBind对象
myBind= this.BindingContext [ myDataSet , "books" ] ;
}
protected void saveClick ( object sender , System.EventArgs e )
{
try
{
//判断所有字段是否添完，添完则执行，反之弹出提示
if ( t_bookid.Text != "" && t_booktitle.Text != "" && t_bookauthor.
Text != "
" && t_bookprice.Text != "" && t_bookstock.Text != "" )
{
string strConn = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =
sample
.mdb " ;
OleDbConnection myConn = new OleDbConnection ( strConn ) ;
myConn.Open ( ) ;
string strInsert = " INSERT INTO books ( bookid , booktitle , bookauthor
, b
ookprice , bookstock ) VALUES ( " ;
strInsert += t_bookid.Text + ", '" ;
strInsert += t_booktitle.Text + "', '" ;
strInsert += t_bookauthor.Text + "', " ;
strInsert += t_bookprice.Text + ", " ;
strInsert += t_bookstock.Text + ")" ;
OleDbCommand inst = new OleDbCommand ( strInsert , myConn ) ;
inst.ExecuteNonQuery ( ) ;
myConn.Close ( ) ;
}
}
//按钮"下一条"对象事件程序
protected void GoNext ( object sender , System.EventArgs e )
{
if ( myBind.Position == myBind.Count -1 )
MessageBox.Show ( "已经到了最后一条记录！" ) ;
else
myBind.Position += 1 ;
}
//按钮"上一条"对象事件程序
protected void GoPrevious ( object sender , System.EventArgs e )
{
if ( myBind.Position == 0 )
MessageBox.Show ( "已经到了第一条记录?
t_bookauthor.Text = "" ;
t_bookprice.Text = "" ;
t_bookstock.Text = "" ;
}
//按钮"尾记录"对象事件程序
protected void GoLast ( object sender , System.EventArgs e )
{
myBind.Position = myBind.Count - 1 ;
}
//按钮"下一条"对象事件程序
protected void GoNext ( object sender , System.EventArgs e )
{
if ( myBind.Position == myBind.Count -1 )
MessageBox.Show ( "已经到了最后一条记录！" ) ;
else
myBind.Position += 1 ;
}
//按钮"上一条"对象事件程序
protected void GoPrevious ( object sender , System.EventArgs e )
{
if ( myBind.Position == 0 )
MessageBox.Show ( "已经到了第一条记录！" ) ;
else
myBind.Position -= 1 ;
}
//按钮"首记录"对象事件程序
protected void GoFirst ( object sender , System.EventArgs e )
{
myBind.Position = 0 ;
}
标 题: 用Visual C＃来增加数据记录(2)
发信站: 飘渺水云间 (Sun Dec 9 21:13:35 2001), 转信
二．用Visual C#往SQL SERVER数据库中插入记录：
（1）用Visual C#往Access 2000和SQL SERVER添加记录的主要区别在于使用了不
同的数
据库引擎。在编写程序之前，首先假设数据库服务器名称为：server1，要访问的
数据库
名称为：data1，数据表名称为：books。用户名为：sa。其中数据表的数据结构和
Acce
ss 2000的表的结构相同。下面是程序中打开SQL SERVER的数据引擎程序代码：
// 设定数据连接字符串，此字符串的意思是打开Sql server数据库，服务器名称
为ser
ver1,数据库为data1
string strCon = "Provider = SQLOLEDB.1 ; Persist Security Info = False ;
Use
r ID = sa ; Initial Catalog = data1 ; Data Source = server1 " ;
OleDbConnection myConn = new OleDbConnection ( strCon ) ;
myConn.Open ( ) ;
（2）.用Visual C#往SQL SERVER 数据库中插入记录的源程序代码( add02.cs )：
using System ;
using System.Drawing ;
using System.ComponentModel ;
using System.Windows.Forms ;
using System.Data.OleDb ;
using System.Data ;
//导入程序中使用到的名称空间
public class DataAdd : Form {
private Button lastrec ;
private Button nextrec ;
private Button previousrec ;
private Button firstrec ;
private Container components ;
private Label title ;
private Button t_new ;
private Button save ;
private TextBox t_bookstock ;
private TextBox t_bookprice ;
private TextBox t_bookauthor ;
private TextBox t_booktitle ;
private TextBox t_bookid ;
private Label l_bookstock ;
private Label l_bookprice ;
private Label l_bookauthor ;
private Label l_booktitle ;
private Label l_bookid ;
private DataSet myDataSet ;
private BindingManagerBase myBind ;
//定义在程序中要使用的组件
public DataAdd ( ) {
//连接到一个数据库
GetConnected ( ) ;
// 对窗体中所需要的内容进行初始化
InitializeComponent ( );
}
//释放程序使用过的所以资源
public override void Dispose ( ) {
base.Dispose ( ) ;
components.Dispose ( ) ;
}
public static void Main ( ) {
Application.Run ( new DataAdd ( ) ) ;
}
public void GetConnected ( )
{
try{
// 设定数据连接字符串，此字符串的意思是打开Sql server数据库，服务器名称
为ser
ver1,数据库为data1，用户名为sa。
string strCon = "Provider = SQLOLEDB.1 ; Persist Security Info = False ;
Use
r ID = sa ; Initial Catalog = data1 ; Data Source = server1 " ;
OleDbConnection myConn = new OleDbConnection ( strCon ) ;
myConn.Open ( ) ;
string strCom = " SELECT * FROM books " ;
//创建一个 DataSet
myDataSet = new DataSet ( ) ;
//用 OleDbDataAdapter 得到一个数据集
OleDbDataAdapter myCommand = new OleDbDataAdapter ( strCom , myConn ) ;
//把Dataset绑定books数据表
myCommand.Fill ( myDataSet , "books" ) ;
//关闭此OleDbConnection
myConn.Close ( ) ;
}
catch ( Exception e )
{
MessageBox.Show ( "连接错误! " + e.ToString ( ) , "错误" ) ;
}
}
private void InitializeComponent ( )
{
components = new System.ComponentModel.Container ( ) ;
nextrec = new Button ( ) ;
lastrec = new Button ( ) ;
previousrec = new Button ( ) ;
firstrec = new Button ( ) ;
t_bookprice = new TextBox ( ) ;
l_booktitle = new Label ( ) ;
l_bookprice = new Label ( ) ;
l_bookauthor = new Label ( ) ;
t_bookid = new TextBox ( ) ;
save = new Button ( ) ;
title = new Label ( ) ;
t_bookauthor = new TextBox ( ) ;
t_booktitle = new TextBox ( ) ;
t_new = new Button ( ) ;
l_bookstock = new Label ( ) ;
t_bookstock = new TextBox ( ) ;
l_bookid = new Label ( ) ;
//以下是对数据浏览的四个按钮进行初始化
firstrec.Location = new System.Drawing.Point ( 65 , 312 ) ;
firstrec.ForeColor = System.Drawing.Color.Black ;
firstrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
firstrec.Font = new System.Drawing.Font("仿宋", 8f );
firstrec.Text = "首记录";
firstrec.Click += new System.EventHan
previousrec = new Button ( ) ;
firstrec = new Button ( ) ;
t_bookprice = new TextBox ( ) ;
l_booktitle = new Label ( ) ;
l_bookprice = new Label ( ) ;
l_bookauthor = new Label ( ) ;
t_bookid = new TextBox ( ) ;
save = new Button ( ) ;
title = new Label ( ) ;
t_bookauthor = new TextBox ( ) ;
t_booktitle = new TextBox ( ) ;
t_new = new Button ( ) ;
l_bookstock = new Label ( ) ;
t_bookstock = new TextBox ( ) ;
l_bookid = new Label ( ) ;
//以下是对数据浏览的四个按钮进行初始化
firstrec.Location = new System.Drawing.Point ( 65 , 312 ) ;
firstrec.ForeColor = System.Drawing.Color.Black ;
firstrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
firstrec.Font = new System.Drawing.Font("仿宋", 8f );
firstrec.Text = "首记录";
firstrec.Click += new System.EventHandler(GoFirst);
previousrec.Location = new System.Drawing.Point ( 135 , 312 ) ;
previousrec.ForeColor = System.Drawing.Color.Black ;
previousrec.Size = new System.Drawing.Size(40, 24) ;
previousrec.Font = new System.Drawing.Font ( "仿宋" , 8f ) ;
previousrec.Text = "上一条" ;
previousrec.Click += new System.EventHandler ( GoPrevious ) ;
nextrec.Location = new System.Drawing.Point ( 205 , 312 );
nextrec.ForeColor = System.Drawing.Color.Black ;
nextrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
nextrec.Font = new System.Drawing.Font ( "仿宋" , 8f ) ;
nextrec.Text = "下一条" ;
nextrec.Click += new System.EventHandler ( GoNext );
lastrec.Location = new System.Drawing.Point ( 275 , 312 ) ;
lastrec.ForeColor = System.Drawing.Color.Black ;
lastrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
lastrec.Font = new System.Drawing.Font ( "仿宋" , 8f ) ;
lastrec.Text = "尾记录" ;
lastrec.Click += new System.EventHandler ( GoLast ) ;
//以下是对显示标签进行初始化
l_bookid.Location = new System.Drawing.Point ( 24 , 56 ) ;
l_bookid.Text = "书本序号：" ;
l_bookid.Size = new System.Drawing.Size ( 112, 20 ) ;
l_bookid.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
title.Location = new System.Drawing.Point ( 32 , 16 ) ;
title.Text = "利用Vsiual C#来增加数据记录！" ;
title.Size = new System.Drawing.Size ( 336 , 24 ) ;
title.ForeColor = System.Drawing.Color.Green ;
title.Font = new System.Drawing.Font ( "仿宋" , 14f , System.Drawing.
FontSty
le.Bold ) ;
//以下是对为显示数据记录而设定的标签和文本框进行初始化，并把记录绑定在不
同的
绑定到文本框"Text"属性上
t_bookid.Location = new System.Drawing.Point ( 184 , 56 ) ;
t_bookid.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_bookid.DataBindings.Add ( "Text" , myDataSet , "books.bookid" ) ;
t_bookstock.Location = new System.Drawing.Point ( 184 , 264 ) ;
t_bookstock.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_bookstock.DataBindings.Add ( "Text" , myDataSet , "books.bookstock"
) ;
t_booktitle.Location = new System.Drawing.Point ( 184 , 108 ) ;
t_booktitle.Size = new System.Drawing.Size ( 176 , 20 ) ;
t_booktitle.DataBindings.Add( "Text" , myDataSet , "books.booktitle" )
;
t_bookprice.Location = new System.Drawing.Point ( 184 , 212 ) ;
t_bookprice.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_bookprice.DataBindings.Add ( "Text" , myDataSet , "books.bookprice"
) ;
t_bookauthor.Location = new System.Drawing.Point ( 184 , 160 ) ;
t_bookauthor.Size = new System.Drawing.Size ( 128 , 20 ) ;
t_bookauthor.DataBindings.Add ( "Text" , myDataSet , "books.
bookauthor" ) ;
t_new.Location = new System.Drawing.Point ( 62 , 354 ) ;
t_new.Size = new System.Drawing.Size ( 96 , 32 ) ;
t_new.Text = "新建记录" ;
t_new.Click += new System.EventHandler ( t_newClick ) ;
save.Location = new System.Drawing.Point ( 222 , 354 ) ;
save.Size = new System.Drawing.Size ( 96 , 32 ) ;
save.TabIndex = 4 ;
save.Text = "保存记录" ;
save.Click += new System.EventHandler ( saveClick ) ;
this.Text = "利用Vsiual C#来增加数据记录的程序窗口！" ;
this.AutoScaleBaseSize = new System.Drawing.Size ( 5 , 13 ) ;
this.FormBorderStyle = FormBorderStyle.Fixed3D ;
this.ClientSize = new System.Drawing.Size ( 390 , 400 ) ;
//在窗体中加入下列组件
this.Controls.Add ( lastrec ) ;
this.Controls.Add ( nextrec ) ;
this.Controls.Add ( previousrec ) ;
this.Controls.Add ( firstrec ) ;
this.Controls.Add ( title ) ;
this.Controls.Add ( t_new ) ;
this.Controls.Add ( save ) ;
this.Controls.Add ( t_bookstock ) ;
this.Controls.Add ( t_bookprice ) ;
this.Controls.Add ( t_bookauthor ) ;
this.Controls.Add ( t_booktitle ) ;
this.Controls.Add ( t_bookid ) ;
this.Controls.Add ( l_bookstock ) ;
this.Controls.Add ( l_bookprice ) ;
this.Controls.Add ( l_bookauthor ) ;
this.Controls.Add ( l_booktitle ) ;
this.Controls.Add ( l_bookid ) ;
//把对象DataSet和"books"数据表绑定到此myBind对象
myBind= this.BindingContext [ myDataSet , "books" ] ;
}
protected void saveClick ( object sender , System.EventArgs e )
{
try
{
//判断所有字段是否添完，添完则执行，反之弹出提示
if ( t_bookid.Text != "" && t_booktitle.Text != "" && t_bookauthor.
Text != "
" && t_bookprice.Text != "" && t_bookstock.Text != "" )
{
this.Controls.Add ( save ) ;
this.Controls.Add ( t_bookstock ) ;
this.Controls.Add ( t_bookprice ) ;
this.Controls.Add ( t_bookauthor ) ;
this.Controls.Add ( t_booktitle ) ;
this.Controls.Add ( t_bookid ) ;
this.Controls.Add ( l_bookstock ) ;
this.Controls.Add ( l_bookprice ) ;
this.Controls.Add ( l_bookauthor ) ;
this.Controls.Add ( l_booktitle ) ;
this.Controls.Add ( l_bookid ) ;
//把对象DataSet和"books"数据表绑定到此myBind对象
myBind= this.BindingContext [ myDataSet , "books" ] ;
}
protected void saveClick ( object sender , System.EventArgs e )
{
try
{
//判断所有字段是否添完，添完则执行，反之弹出提示
if ( t_bookid.Text != "" && t_booktitle.Text != "" && t_bookauthor.
Text != "
" && t_bookprice.Text != "" && t_bookstock.Text != "" )
{
// 设定数据连接字符串，此字符串的意思是打开Sql server数据库，服务器名称
为ser
{
MessageBox.Show ( "保存数据记录发生 " + ed.ToString ( ) , "错误！" ) ;
}
}
protected void t_newClick ( object sender , System.EventArgs
string strInsert = " INSERT INTO books ( bookid , booktitle , bookauthor
, b
ookprice , bookstock ) VALUES ( " ;
strInsert += t_bookid.Text + ", '" ;
strInsert += t_booktitle.Text + "', '" ;
strInsert += t_bookauthor.Text + "', " ;
strInsert += t_bookprice.Text + ", " ;
strInsert += t_bookstock.Text + ")" ;
OleDbCommand inst = new OleDbCommand ( strInsert , myConn ) ;
inst.ExecuteNonQuery ( ) ;
myConn.Close ( ) ;
}
else
{
MessageBox.Show ( "必须填满所有字段值！" , "错误！" ) ;
}
}
catch ( Exception ed )
{
MessageBox.Show ( "保存数据记录发生 " + ed.ToString ( ) , "错误！" ) ;
}
}
protected void t_newClick ( object sender , System.EventArgs e )
{
t_bookid.Text = "" ;
t_booktitle.Text = "" ;
t_bookauthor.Text = "" ;
t_bookprice.Text = "" ;
t_bookstock.Text = "" ;
}
//按钮"尾记录"对象事件程序
protected void GoLast ( object sender , System.EventArgs e )
{
myBind.Position = myBind.Count - 1 ;
}
//按钮"下一条"对象事件程序
protected void GoNext ( object sender , System.EventArgs e )
{
if ( myBind.Position == myBind.Count -1 )
MessageBox.Show ( "已经到了最后一条记录！" ) ;
else
myBind.Position += 1 ;
}
//按钮"上一条"对象事件程序
protected void GoPrevious ( object sender , System.EventArgs e )
{
if ( myBind.Position == 0 )
MessageBox.Show ( "已经到了第一条记录！" ) ;
else
myBind.Position -= 1 ;
}
//按钮"首记录"对象事件程序
protected void GoFirst ( object sender , System.EventArgs e )
{
myBind.Position = 0 ;
}
}
三．总结：
本文主要是通过二个程序的例子来具体说明用Visual C#如何往远程数据库--SQL
SERVE
R和本地数据库-- Access 2000中插入记录。对于其他类型的数据库也可以比照这
二个这
二个数据库来处理，一般来说，用Visual C#处理数据库只是在选用数据库引擎上
有较大
的差别，在程序中的具体设计和处理上，还是很类似的。最后希望此篇文章能对你
的数
标 题: 用Visual C＃中轻松浏览数据库记录
发信站: 飘渺水云间 (Sun Dec 9 21:14:00 2001), 转信
用Delphi或者VB编程，在对数据库中的记录进行操作的时候，经常用到一个名称为
数据
导航器的组件，通过这个组件，可以非常方便的实现对已经绑定到此组件的数据表
中的
记录进行浏览。就是所谓的上一条记录、下一条记录、首记录、尾记录等。那么在
Visu
al C#是否也存在这样的组件呢？答案是否定的。但由于Visual C#有着强大的数据
库处
理能力，所以可以比较方便的做一个类似于此组件的程序。本文就是来介绍此程序
的具
体制作过程。
一、 程序的主要功能介绍：
程序打开本地Acess数据库（sample.mdb）中的book数据表，然后把book数据表中
的
字段绑定到程序提供的文本框中，显示出来。通过程序中的四个按钮"首记录"、"
尾记录
"、"上一条"、"下一条"，实现对book数据表中的记录浏览。程序的运行界面如下
：
图01：对数据表中记录浏览程序的运行界面
二、程序设计和运行的环境设置：
（1）视窗2000服务器版
（2）Microsoft Acess Data Component 2.6 ( MADC 2.6 )
三、程序设计难点和应该注意的问题：
（1）如何实现把数据表中的字段用文本框来显示：
如果直接把字段的值赋值给文本框，这时如果用"下一条"等按钮来浏览数据记录的
时候
，文本框的值是不会变化的。如何让文本框根据数据表中的记录指针来动态的显示
要字
段值，这是本文的一个重点，也是一个难点。
本文是通过把数据表中的字段值绑定到文本框的"Text"属性上，来实现动态显示字
段数
值的。实现这种处理要用到文本框的DataBindings属性和其中的Add方法。具体语
法如下
：
文本组件名称.DataBindings.Add ( "Text" , DataSet对象 , 数据表和字段名称
) ;
在程序具体如下：
t_bookid.DataBindings.Add ( "Text" , myDataSet , "books.bookid" ) ;
这样就可以根据记录指针来实现要显示的字段值了。
（2）如何改变记录指针：
只有掌握如何改变记录指针，才可以随心所欲的浏览记录。Visual C#改变记录指
针是通
过一个命叫BindingManagerBase对象来实现的。此对象封装在名称空间System.
Windows
.Froms中。BindingManagerBase对象是一个抽象的对象，管理所有绑定的同类的数
据源
和数据成员。在程序设计中主要用到BindingManagerBase对象中的二个属性，即：
Posi
tion属性和Count属性。第一个属性是记录了数据集的当前指针，后一个属性是当
前数据
集中的记录总数。由此可以得到改变记录指针的四个按钮对应的程序代码：
i>.首记录：
myBind.Position = 0 ;
ii>.尾记录：
myBind.Position = myBind.Count - 1 ;
iii>.下一条记录和操作后运行界面：
if ( myBind.Position == myBind.Count -1 )
MessageBox.Show ( "已经到了最后一条记录！" ) ;
else
myBind.Position += 1 ;
iV>.上一条记录和操作后运行界面：
if ( myBind.Position == 0 )
MessageBox.Show ( "已经到了第一条记录！" ) ;
else
myBind.Position -= 1 ;
四.程序源代码:
using System ;
using System.Drawing ;
using System.ComponentModel ;
using System.Windows.Forms ;
using System.Data.OleDb ;
using System.Data ;
public class DataView : Form {
private System.ComponentModel.Container components ;
private Button lastrec ;
private Button nextrec ;
private Button previousrec ;
private Button firstrec ;
private TextBox t_books ;
private TextBox t_bookprice ;
private TextBox t_bookauthor ;
private TextBox t_booktitle ;
private TextBox t_bookid ;
private Label l_books ;
private Label l_bookprice ;
private Label l_bookauthor ;
private Label l_booktitle ;
private Label l_bookid ;
private Label label1 ;
private System.Data.DataSet myDataSet ;
private BindingManagerBase myBind ;
public DataView ( )
{
//连接到一个数据库
GetConnected ( ) ;
// 对窗体中所需要的内容进行初始化
InitializeComponent ( );
}
public override void Dispose ( ) {
base.Dispose ( ) ;
components.Dispose ( ) ;
}
public static void Main ( ) {
Application.Run ( new DataView ( ) ) ;
}
public void GetConnected ( )
{
try{
//创建一个 OleDbConnection
string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =
sample.
mdb" ;
OleDbConnection myConn = new OleDbConnection ( strCon ) ;
string strCom = " SELECT * FROM books " ;
//创建一个 DataSet
myDataSet = new DataSet ( ) ;
myConn.Open ( ) ;
//用 OleDbDataAdapter 得到一个数据集
OleDbDataAdapter myCommand = new OleDbDataAdapter ( strCom , myConn ) ;
//把Dataset绑定books数据表
myCommand.Fill ( myDataSet , "books" ) ;
//关闭此OleDbConnection
myConn.Close ( ) ;
}
catch ( Exception e )
{
MessageBox.Show ( "连接错误! " + e.ToString ( ) , "错误" ) ;
}
}
private void InitializeComponent ( )
{
this.components = new System.ComponentModel.Container ( ) ;
this.t_bookid = new TextBox ( ) ;
this.nextrec = new Button ( ) ;
this.lastrec = new Button ( ) ;
this.l_bookid = new Label ( ) ;
this.t_books = new TextBox ( ) ;
this.t_booktitle = new TextBox ( ) ;
this.t_bookprice = new TextBox ( ) ;
this.firstrec = new Button ( ) ;
this.l_booktitle = new Label ( ) ;
this.l_bookprice = new Label ( ) ;
this.l_books = new Label ( ) ;
this.previousrec = new Button ( ) ;
this.l_bookauthor = new Label ( ) ;
this.t_bookauthor = new TextBox ( ) ;
this.label1 = new Label ( ) ;
//以下是对数据浏览的四个按钮进行初始化
firstrec.Location = new System.Drawing.Point ( 55 , 312 ) ;
firstrec.ForeColor = System.Drawing.Color.Black ;
firstrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
firstrec.TabIndex = 5 ;
firstrec.Font = new System.Drawing.Font("仿宋", 8f );
firstrec.Text = "首记录";
firstrec.Click += new System.EventHandler(GoFirst);
previousrec.Location = new System.Drawing.Point ( 125 , 312 ) ;
previousrec.ForeColor = System.Drawing.Color.Black ;
previousrec.Size = new System.Drawing.Size(40, 24) ;
previousrec.TabIndex = 6 ;
previousrec.Font = new System.Drawing.Font ( "仿宋" , 8f ) ;
previousrec.Text = "上一条" ;
previousrec.Click += new System.EventHandler ( GoPrevious ) ;
nextrec.Location = new System.Drawing.Point ( 195 , 312 );
nextrec.ForeColor = System.Drawing.Color.Black ;
nextrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
nextrec.TabIndex = 7 ;
nextrec.Font = new System.Drawing.Font ( "仿宋" , 8f ) ;
nextrec.Text = "下一条" ;
nextrec.Click += new System.EventHandler ( GoNext );
lastrec.Location = new System.Drawing.Point ( 265 , 312 ) ;
lastrec.ForeColor = System.Drawing.Color.Black ;
lastrec.Size = new System.Drawing.Size ( 40 , 24 ) ;
lastrec.TabIndex = 8 ;
lastrec.Font = new System.Drawing.Font ( "仿宋" , 8f ) ;
lastrec.Text = "尾记录" ;
lastrec.Click += new System.EventHandler ( GoLast ) ;
//以下是对为显示数据记录而设定的标签和文本框进行初始化，并把记录绑定在不
同的
绑定到文本框"Text"属性上
t_bookid.Location = new System.Drawing.Point ( 184 , 56 ) ;
t_bookid.TabIndex = 9 ;
t_bookid.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_bookid.DataBindings.Add ( "Text" , myDataSet , "books.bookid" ) ;
t_books.Location = new System.Drawing.Point ( 184 , 264 ) ;
t_books.TabIndex = 10 ;
t_books.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_books.DataBindings.Add ( "Text" , myDataSet , "books.bookstock" ) ;
t_booktitle.Location = new System.Drawing.Point ( 184 , 108 ) ;
t_booktitle.TabIndex = 11 ;
t_booktitle.Size = new System.Drawing.Size ( 176 , 20 ) ;
t_booktitle.DataBindings.Add( "Text" , myDataSet , "books.booktitle" )
;
t_bookprice.Location = new System.Drawing.Point ( 184 , 212 ) ;
t_bookpriccation = new System.Drawing.Point ( 265 , 312 ) ;
t_bookprice.Size = new System.Drawing.Size ( 80 , 20 ) ;
t_bookprice.DataBindings.Add ( "Text" , myDataSet , "books.bookprice"
) ;
t_bookauthor.Location = new System.Drawing.Point ( 184 , 160 ) ;
t_bookauthor.TabIndex = 18 ;
t_bookauthor.Size = new System.Drawing.Size ( 128 , 20 ) ;
t_bookauthor.DataBindings.Add ( "Text" , myDataSet , "books.
bookauthor" ) ;
l_bookid.Location = new System.Drawing.Point ( 24 , 56 ) ;
l_bookid.Text = "书本序号：" ;
l_bookid.Size = new System.Drawing.Size ( 112, 20 ) ;
l_bookid.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
l_bookid.TabIndex = 13 ;
l_bookid.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
l_booktitle.Location = new System.Drawing.Point ( 24 , 108 ) ;
l_booktitle.Text = "书 名：";
l_booktitle.Size = new System.Drawing.Size ( 112 , 20 ) ;
l_booktitle.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
l_booktitle.TabIndex = 14 ;
l_booktitle.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
l_bookprice.Location = new System.Drawing.Point ( 24 , 212 ) ;
l_bookprice.Text = "价 格：" ;
l_bookprice.Size = new System.Drawing.Size ( 112 , 20 ) ;
l_bookprice.Font = new 12 ;
l_bookprice.TabIndex = 15 ;
l_bookprice.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
l_books.Location = new System.Drawing.Point ( 24 , 264 ) ;
l_books.Text = "书 架 号：" ;
l_books.Size = new System.Drawing.Size ( 112 , 20 ) ;
l_books.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
l_books.TabIndex = 16 ;
l_books.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
l_bookauthor.Location = new System.Drawing.Point ( 24 , 160 ) ;
l_bookauthor.Text = "作 者：" ;
l_bookauthor.Size = new System.Drawing.Size ( 112 , 20 ) ;
l_bookauthor.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
l_bookauthor.TabIndex = 17 ;
l_bookauthor.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
label1.Location = new System.Drawing.Point ( 49 , 8 ) ;
label1.Text = "浏览书籍信息" ;
label1.Size = new System.Drawing.Size ( 296 , 24 ) ;
label1.ForeColor = System.Drawing.Color.Green ;
label1.Font = new System.Drawing.Font ( "仿宋" , 15f ) ;
label1.TabIndex = 19 ;
//对窗体进行设定
this.Text = "用C#做浏览数据库中记录的程序！";
l_bookprice.TabIndex = 15 ;
l_bookprice.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
l_books.Location = new System.Drawing.Point ( 24 , 264 ) ;
l_books.Text = "书 架 号：" ;
l_books.Size = new System.Drawing.Size ( 112 , 20 ) ;
l_books.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
l_books.TabIndex = 16 ;
l_books.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
l_bookauthor.Location = new System.Drawing.Point ( 24 , 160 ) ;
l_bookauthor.Text = "作 者：" ;
l_bookauthor.Size = new System.Drawing.Size ( 112 , 20 ) ;
l_bookauthor.Font = new System.Drawing.Font ( "仿宋" , 10f ) ;
l_bookauthor.TabIndex = 17 ;
l_bookauthor.TextAlign = System.Drawing.ContentAlignment.MiddleCenter ;
label1.Location = new System.Drawing.Point ( 49 , 8 ) ;
label1.Text = "浏览书籍信息" ;
label1.Size = new System.Drawing.Size ( 296 , 24 ) ;
label1.ForeColor = System.Drawing.Color.Green ;
label1.Font = new System.Drawing.Font ( "仿宋" , 15f ) ;
label1.TabIndex = 19 ;
//对窗体进行设定
this.Text = "用C#做浏览数据库中记录的程序！";
this.AutoScaleBaseSize = new System.Drawing.Size ( 5 , 13 ) ;
this.FormBorderStyle = FormBorderStyle.FixedSingle ;
this.ClientSize = new System.Drawing.Size ( 394 , 375 ) ;
//在窗体中加入组件
this.Controls.Add ( lastrec ) ;
this.Controls.Add ( nextrec ) ;
this.Controls.Add ( previousrec ) ;
this.Controls.Add ( firstrec ) ;
this.Controls.Add ( t_books ) ;
this.Controls.Add ( t_bookprice ) ;
this.Controls.Add ( t_bookauthor ) ;
this.Controls.Add ( t_booktitle ) ;
this.Controls.Add ( t_bookid ) ;
this.Controls.Add ( l_books ) ;
this.Controls.Add ( l_bookprice ) ;
this.Controls.Add ( l_bookauthor ) ;
this.Controls.Add ( l_booktitle ) ;
this.Controls.Add ( l_bookid ) ;
this.Controls.Add ( label1 ) ;
//把对象DataSet和"books"数据表绑定到此myBind对象
myBind= this.BindingContext [ myDataSet , "books" ] ;
}
//按钮"首记录"对象事件程序
protected void GoFirst ( object sender , System.EventArgs e )
{
myBind.Position = 0 ;
}
}
五.总结：
本文的重点就在于如何用Visual C#改变数据集的记录指针和如何让文本框根据记
录指针
的变化而改变显示内容。虽然此类处理在Visual C#比起用其他语言要显得麻烦些
。但对
于程序设计人员却更灵活了，使得程序设计人员有了更大的发展空间。
--
我早已习惯无情的风雨
但不能没有你……
※ 来源:·飘渺水云间 Freecity.dhs.org·[FROM: xixixi]
--
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