知识大全 Visual C＃中轻松浏览数据库记录

Posted 2022-07-16 知

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　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Visual 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

　　二程序设计和运行的环境设置 　　（）视窗服务器版　　（）Microsoft Acess Data Component ( MADC )

　　三程序设计难点和应该注意的问题 　　（）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　　（）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名叫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 Position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 = ;　　ii> 尾记录 myBind Position = myBind Count ;　　iii> 下一条记录和操作后运行界面 if ( myBind Position == myBind Count )MessageBox Show ( 已经到了最后一条记录！ ) ;elsemyBind Position += ;

　　iV> 上一条记录和操作后运行界面 if ( myBind Position == )MessageBox Show ( 已经到了第一条记录！ ) ;elsemyBind Position = ;

　　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 ponents ;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 label ;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 ( ) ;ponents Dispose ( ) ;public static void Main ( ) Application Run ( new DataView ( ) ) ;public void GetConnected ( )try//创建一个 OleDbConnectionstring strCon = Provider = Microsoft Jet OLEDB ; Data Source = sample mdb ;OleDbConnection myConn = new OleDbConnection ( strCon ) ;string strCom = SELECT * FROM books ;//创建一个 DataSetmyDataSet = 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OleDbConnectionmyConn Close ( ) ;catch ( Exception e )MessageBox Show ( 连接错误! + e ToString ( ) 错误 ) ;private void InitializeComponent ( )this ponents = 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 label = 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 ( ) ;firstrec ForeColor = System Drawing Color Black ;firstrec Size = new System Drawing Size ( ) ;firstrec TabIndex = ;firstrec Font = new System Drawing Font( 仿宋 f );firstrec Text = 首记录 ;firstrec Click += new System EventHandler(GoFirst);previousrec Location = new System Drawing Point ( ) ;previousrec ForeColor = System Drawing Color Black ;previousrec Size = new System Drawing Size( ) ;previousrec TabIndex = ;previousrec Font = new System Drawing Font ( 仿宋 f ) ;previousrec Text = 上一条 ;previousrec Click += new System EventHandler ( GoPrevious ) ;nextrec Location = new System Drawing Point ( );nextrec ForeColor = System Drawing Color Black ;nextrec Size = new System Drawing Size ( ) ;nextrec TabIndex = ;nextrec Font = new System Drawing Font ( 仿宋 f ) ;nextrec Text = 下一条 ;nextrec Click += new System EventHandler ( GoNext );

lastrec Location = new System Drawing Point ( ) ;lastrec ForeColor = System Drawing Color Black ;lastrec Size = new System Drawing Size ( ) ;lastrec TabIndex = ;lastrec Font = new System Drawing Font ( 仿宋 f ) ;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 ( ) ;t_bookid TabIndex = ;t_bookid Size = new System Drawing Size ( ) ;t_bookid DataBindings Add ( Text myDataSet books bookid ) ;

t_books Location = new System Drawing Point ( ) ;t_books TabIndex = ;t_books Size = new System Drawing Size ( ) ;t_books DataBindings Add ( Text myDataSet books bookstock ) ;

t_booktitle Location = new System Drawing Point ( ) ;t_booktitle TabIndex = ;t_booktitle Size = new System Drawing Size ( ) ;t_booktitle DataBindings Add( Text myDataSet books booktitle ) ;

t_bookprice Location = new System Drawing Point ( ) ;t_bookprice TabIndex = ;t_bookprice Size = new System Drawing Size ( ) ;t_bookprice DataBindings Add ( Text myDataSet books bookprice ) ;

t_bookauthor Location = new System Drawing Point ( ) ;t_bookauthor TabIndex = ;t_bookauthor Size = new System Drawing Size ( ) ;t_bookauthor DataBindings Add ( Text myDataSet books bookauthor ) ;l_bookid Location = new System Drawing Point ( ) ;l_bookid Text = 书本序号 ;l_bookid Size = new System Drawing Size ( ) ;l_bookid Font = new System Drawing Font ( 仿宋 f ) ;l_bookid TabIndex = ;l_bookid TextAlign = System Drawing ContentAlignment MiddleCenter ;l_booktitle Location = new System Drawing Point ( ) ;l_booktitle Text = 书名 ;l_booktitle Size = new System Drawing Size ( ) ;l_booktitle Font = new System Drawing Font ( 仿宋 f ) ;l_booktitle TabIndex = ;l_booktitle TextAlign = System Drawing ContentAlignment MiddleCenter ;

l_bookprice Location = new System Drawing Point ( ) ;l_bookprice Text = 价格 ;l_bookprice Size = new System Drawing Size ( ) ;l_bookprice Font = new System Drawing Font ( 仿宋 f ) ;l_bookprice TabIndex = ;l_bookprice TextAlign = System Drawing ContentAlignment MiddleCenter ;

l_books Location = new System Drawing Point ( ) ;l_books Text = 书架号 ;l_books Size = new System Drawing Size ( ) ;l_books Font = new System Drawing Font ( 仿宋 f ) ;l_books TabIndex = ;l_books TextAlign = System Drawing ContentAlignment MiddleCenter ;

l_bookauthor Location = new System Drawing Point ( ) ;l_bookauthor Text = 作者 ;l_bookauthor Size = new System Drawing Size ( ) ;l_bookauthor Font = new System Drawing Font ( 仿宋 f ) ;l_bookauthor TabIndex = ;l_bookauthor TextAlign = System Drawing ContentAlignment MiddleCenter ;

label Location = new System Drawing Point ( ) ;label Text = 浏览书籍信息 ;label Size = new System Drawing Size ( ) ;label ForeColor = System Drawing Color Green ;label Font = new System Drawing Font ( 仿宋 f ) ;label TabIndex = ;//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 ( ) ;this FormBorderStyle = FormBorderStyle FixedSingle ;this ClientSize = new System Drawing Size ( ) ;//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 ( label ) ;//把对象DataSet和 books 数据表绑定到此myBind对象myBind= this BindingContext [ myDataSet books ] ;//按钮尾记录对象事件程序protected void GoLast ( object sender System EventArgs e )myBind Position = myBind Count ;

//按钮下一条对象事件程序protected void GoNext ( object sender System EventArgs e )if ( myBind Position == myBind Count )MessageBox Show ( 已经到了最后一条记录！ ) ;elsemyBind Position += ;//按钮上一条对象事件程序protected void GoPrevious ( object sender System EventArgs e )if ( myBind Position == )MessageBox Show ( 已经到了第一条记录！ ) ;elsemyBind Position = ;//按钮首记录对象事件程序protected void GoFirst ( object sender System EventArgs e )myBind Position = ;

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