精通C#數(shù)據(jù)庫(kù)編程及相關(guān)實(shí)例
針對(duì)數(shù)據(jù)庫(kù)編程始終是程序設(shè)計(jì)語(yǔ)言的一個(gè)重要方面的內(nèi)容,也是一個(gè)難點(diǎn)。數(shù)據(jù)庫(kù)編程的內(nèi)容十分豐富,但最為基本編程的也就是那么幾點(diǎn),譬如:連接數(shù)據(jù)庫(kù)、得到需要的數(shù)據(jù)和針對(duì)數(shù)據(jù)記錄的瀏覽、刪除、修改、插入等操作。其中又以后面針對(duì)數(shù)據(jù)記錄的數(shù)據(jù)操作為重點(diǎn)。本文就來(lái)著重探討一下如何精通C#數(shù)據(jù)庫(kù)編程,即:如何瀏覽記錄、修改記錄、刪除記錄和插入記錄。
一.程序設(shè)計(jì)和運(yùn)行的環(huán)境設(shè)置:
(1).視窗2000服務(wù)器版
(2).MicrosoftDataAcessComponent2.6以上版本(MDAC2.6)
(3)..NetFrameWorkSDKBeta2
為了更清楚的說(shuō)明問(wèn)題,在數(shù)據(jù)庫(kù)的選用上,采用了當(dāng)前比較典型的數(shù)據(jù)庫(kù),一個(gè)是本地?cái)?shù)據(jù)庫(kù)Access2000,另外一個(gè)是遠(yuǎn)程數(shù)據(jù)庫(kù)SqlServer2000。其中本地?cái)?shù)據(jù)庫(kù)名稱(chēng)為"db.mdb",在其中定義了一張數(shù)據(jù)表"person","person"表的數(shù)據(jù)結(jié)構(gòu)如下表:
字段名稱(chēng)字段類(lèi)型字段意思
id數(shù)字序號(hào)
xm文本姓名
<xb文本性別
nl文本年齡
zip文本郵政編碼
遠(yuǎn)程數(shù)據(jù)庫(kù)SqlServer2000的數(shù)據(jù)庫(kù)服務(wù)器名稱(chēng)為"Server1",數(shù)據(jù)庫(kù)名稱(chēng)為"Data1",登陸的ID為"sa",口令為空,在數(shù)據(jù)庫(kù)也定義了一張"person"表,數(shù)據(jù)結(jié)構(gòu)如上表。
二.精通C#數(shù)據(jù)庫(kù)編程之如何瀏覽數(shù)據(jù):
在《VisualC#的數(shù)據(jù)綁定》中,已經(jīng)了解了如何把數(shù)據(jù)集中的某些字段綁定到WinForm組件的某個(gè)屬性上,這樣程序員就可以根據(jù)以WinForm組件的來(lái)定制數(shù)據(jù)顯示的形式,并且此時(shí)的WinForm組件顯示內(nèi)容就可以隨著記錄指針的變化而改變。至此可見(jiàn),瀏覽數(shù)據(jù)記錄的關(guān)鍵就是如何改變記錄指針。要實(shí)現(xiàn)這種操作,就要使用到BindingManagerBase類(lèi),此類(lèi)的主要作用是管理對(duì)于那些實(shí)現(xiàn)了對(duì)同一個(gè)數(shù)據(jù)源進(jìn)行綁定的對(duì)象。說(shuō)的具體些,就是能夠使得Windows窗體上的已經(jīng)對(duì)同一數(shù)據(jù)源進(jìn)行數(shù)據(jù)綁定的組件保持同步。在BindingManagerBase類(lèi)中定義了一個(gè)屬性"Position",通過(guò)這個(gè)屬性就可以改變BindingManagerBase對(duì)象中的數(shù)據(jù)指針。創(chuàng)建BindingManagerBase對(duì)象必須要使用到BindingContext類(lèi),其實(shí)每一個(gè)由Control類(lèi)中繼承而得到的對(duì)象,都有單一的BindingContext對(duì)象,在大多數(shù)創(chuàng)建窗體中實(shí)現(xiàn)數(shù)據(jù)綁定組件的BindingManagerBase對(duì)象是使用Form類(lèi)的BindingContext來(lái)得到。下列代碼是以Access2000數(shù)據(jù)庫(kù)為模型,創(chuàng)建的一個(gè)名稱(chēng)為"myBind"的BindingManagerBase對(duì)象。
- //創(chuàng)建一個(gè)OleDbConnectionstringstrCon="Provider=Microsoft.Jet.OLEDB.4.0;
 - DataSource=db.mdb";OleDbConnectionmyConn=newOleDbConnection(strCon);
 - stringstrCom="SELECT*FROMperson";file://創(chuàng)建一個(gè)DataSetmyDataSet=newDataSet();
 - myConn.Open();file://用OleDbDataAdapter得到一個(gè)數(shù)據(jù)集OleDbDataAdaptermyCommand
 - =newOleDbDataAdapter(strCom,myConn);file:
 - //把Dataset綁定books數(shù)據(jù)表myCommand.Fill(myDataSet,"person");file:
 - //關(guān)閉此OleDbConnectionmyConn.Close();myBind=this.BindingContext[myDataSet,"person"];
 
下列代碼是以SqlServer2000數(shù)據(jù)庫(kù)為模型,創(chuàng)建一個(gè)名稱(chēng)為"myBind"的BindingManagerBase對(duì)象。
- //設(shè)定數(shù)據(jù)連接字符串,此字符串的意思是打開(kāi)Sqlserver數(shù)據(jù)庫(kù),//服務(wù)器名稱(chēng)為server1,數(shù)據(jù)庫(kù)為data1stringstrCon="Provider=SQLOLEDB.1;PersistSecurityInfo=False;
 - UserID=sa;InitialCatalog=data1;DataSource=server1";
 - OleDbConnectionmyConn=newOleDbConnection(strCon);myConn.Open();stringstrCom="SELECT*FROMperson";
 - file://創(chuàng)建一個(gè)DataSetmyDataSet=newDataSet();
 - file://用OleDbDataAdapter得到一個(gè)數(shù)據(jù)集OleDbDataAdaptermyCommand=newOleDbDataAdapter(strCom,myConn);
 - file://把Dataset綁定person數(shù)據(jù)表myCommand.Fill(myDataSet,"person");
 - file://關(guān)閉此OleDbConnectionmyConn.Close();
 - myBind=this.BindingContext[myDataSet,"person"];
 
得到了是同一數(shù)據(jù)源的BindingManagerBase對(duì)象,通過(guò)改變此對(duì)象的"Position"屬性值,這樣綁定數(shù)據(jù)的組件顯示的數(shù)據(jù)就隨之變化,從而實(shí)現(xiàn)導(dǎo)航數(shù)據(jù)記錄。
<I>.導(dǎo)航按鈕"上一條"實(shí)現(xiàn)方法:
- protectedvoidGoPrevious(objectsender,System.EventArgse)
 - {if(myBind.Position==0)MessageBox.Show("已經(jīng)到了第一條記錄!","信息提示!",
 - MessageBoxButtons.OK,MessageBoxIcon.Information);elsemyBind.Position-=1;}
 - <
 
<II>.導(dǎo)航按鈕"下一條"實(shí)現(xiàn)方法:
- protectedvoidGoNext(objectsender,System.EventArgse)
 - {if(myBind.Position==myBind.Count-1)MessageBox.Show("已經(jīng)到了最后一條記錄!","信息提示!",
 - MessageBoxButtons.OK,MessageBoxIcon.Information);elsemyBind.Position+=1;}
 
<III>.導(dǎo)航按鈕"至尾"實(shí)現(xiàn)方法:
- protectedvoidGoLast(objectsender,System.EventArgse){myBind.Position=myBind.Count-1;}
 - <IV>.導(dǎo)航按鈕"至首"實(shí)現(xiàn)方法:protectedvoidGoFirst(objectsender,System.EventArgse){myBind.Position=0;}
 
注釋?zhuān)?Count"是BindingManagerBase對(duì)象的另外一個(gè)重要的屬性,是數(shù)據(jù)集記錄的總數(shù)。
三.精通C#數(shù)據(jù)庫(kù)編程之實(shí)現(xiàn)刪除記錄:
在對(duì)數(shù)據(jù)記錄進(jìn)行操作的時(shí)候,有二點(diǎn)必須十分清晰:
其一:在對(duì)數(shù)據(jù)記錄進(jìn)行操作的時(shí)候,我想有一些程序員一定有這樣一個(gè)疑惑,當(dāng)對(duì)數(shù)據(jù)庫(kù)服務(wù)器請(qǐng)求數(shù)據(jù)集的時(shí)候,就會(huì)產(chǎn)生"DataSet"對(duì)象,用以管理數(shù)據(jù)集,這樣如果這些對(duì)數(shù)據(jù)庫(kù)服務(wù)器的請(qǐng)求非常多,同樣也就會(huì)產(chǎn)生很多的"DataSet"對(duì)象,達(dá)到一定時(shí)候必然會(huì)使得數(shù)據(jù)庫(kù)服務(wù)器崩潰。這種想法是自然的,但和實(shí)際并不相符,因?yàn)?DataSet"對(duì)象并不是在服務(wù)器端產(chǎn)生的,而是在客戶(hù)端產(chǎn)生的。所以面對(duì)眾多的數(shù)據(jù)請(qǐng)求的時(shí)候?qū)?shù)據(jù)庫(kù)服務(wù)器的影響并不十分太大。
其二:記得在用Delphi編寫(xiě)三層數(shù)據(jù)模型的時(shí)候的,每一次對(duì)數(shù)據(jù)庫(kù)的修改其實(shí)只是對(duì)第二層產(chǎn)生的數(shù)據(jù)集的修改,要真正修改數(shù)據(jù)庫(kù),還必須調(diào)用一個(gè)另外的方法。在用ADO.NET處理數(shù)據(jù)庫(kù)的時(shí)候,雖然處理的直接對(duì)象是數(shù)據(jù)庫(kù),但此時(shí)"DataSet"對(duì)象中的內(nèi)容并沒(méi)有隨之改變,而綁定的數(shù)據(jù)組件顯示的數(shù)據(jù)又來(lái)源于"DataSet"對(duì)象,這樣就會(huì)產(chǎn)生一個(gè)錯(cuò)覺(jué),就是修改了的記錄并沒(méi)有修改掉,刪除的記錄并沒(méi)有刪除掉。所以對(duì)數(shù)據(jù)記錄進(jìn)行操作的時(shí)候,在修改數(shù)據(jù)庫(kù)后,還要對(duì)"DataSet"對(duì)象進(jìn)行必要的修改,這樣才能保證"DataSet"對(duì)象和數(shù)據(jù)庫(kù)內(nèi)容一致、同步。下面代碼是刪除當(dāng)前綁定組件顯示的記錄的程序代碼,此代碼是以Access2000數(shù)據(jù)庫(kù)為模板的:
- protectedvoidDelete_record(objectsender,System.EventArgse){DialogResultr=MessageBox.Show("是否刪除當(dāng)前記錄!","刪除當(dāng)前記錄!",
 - MessageBoxButtons.YesNo,MessageBoxIcon.Question);
 - intss=(int)r;
 - if(ss==6)//按動(dòng)"確定"按鈕{try{file://連接到一個(gè)數(shù)據(jù)庫(kù)stringstrCon="Provider=Microsoft.Jet.OLEDB.4.0;DataSource=db.mdb";
 - OleDbConnectionmyConn=newOleDbConnection(strCon);
 - myConn.Open();stringstrDele="DELETEFROMpersonWHEREid="+t_id.Text;OleDbCommandmyCommand=newOleDbCommand(strDele,myConn);
 - file://從數(shù)據(jù)庫(kù)中刪除指定記錄myCommand.ExecuteNonQuery();
 - file://從DataSet中刪除指定記錄myDataSet.Tables["person"].Rows[myBind.Position].Delete();myDataSet.Tables["person"].AcceptChanges();myConn.Close();}
 - catch(Exceptioned){MessageBox.Show("刪除記錄錯(cuò)誤信息:"+ed.ToString(),"錯(cuò)誤!");}}}
 
四.精通C#數(shù)據(jù)庫(kù)編程之插入數(shù)據(jù)記錄:
對(duì)數(shù)據(jù)庫(kù)進(jìn)行插入記錄操作和刪除記錄操作基本的思路是一致的,就是通過(guò)ADO.NET首先插入數(shù)據(jù)記錄到數(shù)據(jù)庫(kù),然后對(duì)"DataSet"對(duì)象進(jìn)行必要的修改。下列代碼就是以Access2000數(shù)據(jù)庫(kù)為模型修改當(dāng)前記錄的代碼:
<
- protectedvoidUpdate_record(objectsender,System.EventArgse){inti=myBind.Position;try{file://連接到一個(gè)數(shù)據(jù)庫(kù)stringstrCon="Provider=Microsoft.Jet.OLEDB.4.0;DataSource=db.mdb";
 - OleDbConnectionmyConn=newOleDbConnection(strCon);myConn.Open();myDataSet.Tables["person"].Rows[myBind.Position].BeginEdit();
 - file://從數(shù)據(jù)庫(kù)中修改指定記錄stringstrUpdt="UPDATEpersonSETxm='"+t_xm.Text+"',xb='"+t_xb.Text+"',nl="+t_nl.Text+",zip="+t_books.Text+"WHEREid="+t_id.Text;OleDbCommandmyCommand=newOleDbCommand(strUpdt,myConn);myCommand.ExecuteNonQuery();
 - myDataSet.Tables["person"].Rows[myBind.Position].EndEdit();myDataSet.Tables["person"].AcceptChanges();myConn.Close();}
 - catch(Exceptioned){MessageBox.Show("修改指定記錄錯(cuò)誤:"+ed.ToString(),"錯(cuò)誤!");}myBind.Position=i;}
 
由于對(duì)SqlServer2000數(shù)據(jù)記錄修改操作和Access2000數(shù)據(jù)記錄修改操作的差異只在于不同的數(shù)據(jù)鏈接,具體的代碼可以參考"刪除數(shù)據(jù)記錄"中的代碼,在這里就不提供了。
五.精通C#數(shù)據(jù)庫(kù)編程之插入數(shù)據(jù)記錄
和前面二種操作在思路是一致的,就是通過(guò)ADO.NET首先插入數(shù)據(jù)記錄到數(shù)據(jù)庫(kù),然后對(duì)"DataSet"對(duì)象進(jìn)行必要的修改。下列代碼就是以Access2000數(shù)據(jù)庫(kù)為模型插入一條數(shù)據(jù)記錄的代碼
- protectedvoidInsert_record(objectsender,System.EventArgse){try{file://判斷所有字段是否添完,添完則執(zhí)行,反之彈出提示
 - if(t_id.Text!=""&&t_xm.Text!=""&&t_xb.Text!=""&&t_nl.Text!=""&&t_books.Text!="")
 - {stringmyConn1="Provider=Microsoft.Jet.OLEDB.4.0;DataSource=db.mdb";OleDbConnectionmyConn
 - =newOleDbConnection(myConn1);
 - myConn.Open();stringstrInsert="INSERTINTOperson(id,xm,xb,nl,zip)VALUES(";strInsert+=t_id.Text+",'";strInsert+=t_xm.Text+"','";strInsert+=t_xb.Text+"',";
 - strInsert+=t_nl.Text+",";strInsert+=t_books.Text+")";OleDbCommandinst=newOleDbCommand(strInsert,myConn);
 - inst.ExecuteNonQuery();myConn.Close();myDataSet.Tables["person"].Rows[myBind.Position].BeginEdit();
 - myDataSet.Tables["person"].Rows[myBind.Position].EndEdit();myDataSet.Tables["person"].AcceptChanges();}
 - else
 - {MessageBox.Show("必須填滿(mǎn)所有字段值!","錯(cuò)誤!");}}
 - catch(Exceptioned){MessageBox.Show("保存數(shù)據(jù)記錄發(fā)生"+ed.ToString(),"錯(cuò)誤!");}}
 
同樣對(duì)SqlServer2000數(shù)據(jù)庫(kù)進(jìn)行插入記錄操作和Access2000數(shù)據(jù)庫(kù)插入記錄操作的差異也只在于不同的數(shù)據(jù)鏈接,具體的代碼可以參考"刪除數(shù)據(jù)記錄"中的代碼,在這里就不提供了。
六.VisualC#數(shù)據(jù)庫(kù)編程的完成源代碼和程序運(yùn)行的主界面:
掌握了上面要點(diǎn),編寫(xiě)一個(gè)完整的數(shù)據(jù)庫(kù)編程的程序就顯得非常容易了,下面是VisualC#進(jìn)行數(shù)據(jù)庫(kù)編程的完整代碼(Data01.cs),此代碼是以Access2000數(shù)據(jù)庫(kù)為模型設(shè)計(jì)的,具體如下:
- using System ;
 - using System.Drawing ;
 - using System.ComponentModel ;
 - using System.Windows.Forms ;
 - using System.Data.OleDb ;
 - using System.Data ;
 - public class Data : Form
 - {
 - private System.ComponentModel.Container components = null ;
 - private Button lastrec ;
 - private Button nextrec ;
 - private Button previousrec ;
 - private Button firstrec ;
 - private TextBox t_books ;
 - private TextBox t_nl ;
 - private ComboBox t_xb ;
 - private TextBox t_xm ;
 - private TextBox t_id ;
 - private Label l_books ;
 - private Label l_nl ;
 - private Label l_xb ;
 - private Label l_xm ;
 - private Label l_id ;
 - private Label label1 ;
 - private DataSet myDataSet ;
 - private Button button1 ;
 - private Button button2 ;
 - private Button button3 ;
 - private Button button4 ;
 - private BindingManagerBase myBind ;
 - public Data ( )
 - {
 - file://連接到一個(gè)數(shù)據(jù)庫(kù)
 - GetConnected ( ) ;
 - // 對(duì)窗體中所需要的內(nèi)容進(jìn)行初始化
 - InitializeComponent ( ) ;
 - }
 - file://清除在程序中使用過(guò)的資源
 - protected override void Dispose( bool disposing )
 - {
 - if( disposing )
 - {
 - if ( components != null )
 - {
 - components.Dispose ( ) ;
 - }
 - }
 - base.Dispose( disposing ) ;
 - }
 - public static void Main ( )
 - {
 - Application.Run ( new Data ( ) ) ;
 - }
 - public void GetConnected ( )
 - {
 - try
 - {
 - file://創(chuàng)建一個(gè) OleDbConnection
 - string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = db.mdb" ;
 - OleDbConnection myConn = new OleDbConnection ( strCon ) ;
 - string strCom = " SELECT * FROM person " ;
 - file://創(chuàng)建一個(gè) DataSet
 - myDataSet = new DataSet ( ) ;
 - myConn.Open ( ) ;
 - file://用 OleDbDataAdapter 得到一個(gè)數(shù)據(jù)集
 - OleDbDataAdapter myCommand = new OleDbDataAdapter ( strCom , myConn ) ;
 - file://把Dataset綁定books數(shù)據(jù)表
 - myCommand.Fill ( myDataSet , "person" ) ;
 - file://關(guān)閉此OleDbConnection
 - myConn.Close ( ) ;
 - }
 - catch ( Exception e )
 - {
 - MessageBox.Show ( "連接錯(cuò)誤! " + e.ToString ( ) , "錯(cuò)誤" ) ;
 - }
 - }
 - private void InitializeComponent ( )
 - {
 - file://添加控件,略
 - this.Name = "Data" ;
 - this.Text = "Visual C#的數(shù)據(jù)庫(kù)編程!" ;
 - this.ResumeLayout(false) ;
 - myBind = this.BindingContext [ myDataSet , "person" ] ;
 - }
 - protected void New_record ( object sender , System.EventArgs e )
 - {
 - t_id.Text = ( myBind.Count + 1 ).ToString ( ) ;
 - t_xm.Text = "" ;
 - t_xb.Text = "" ;
 - t_nl.Text = "" ;
 - t_books.Text = "" ;
 - }
 - protected void Insert_record ( object sender , System.EventArgs e )
 - {
 - try
 - {
 - file://判斷所有字段是否添完,添完則執(zhí)行,反之彈出提示
 - if ( t_id.Text != "" && t_xm.Text != "" && t_xb.Text != "" &&
 - t_nl.Text != "" && t_books.Text != "" )
 - {
 - string myConn1 = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = db.mdb" ;
 - OleDbConnection myConn = new OleDbConnection ( myConn1 ) ;
 - myConn.Open ( ) ;
 - string strInsert = " INSERT INTO person ( id , xm , xb , nl , zip ) VALUES ( " ;
 - strInsert += t_id.Text + ", '" ;
 - strInsert += t_xm.Text + "', '" ;
 - strInsert += t_xb.Text + "', " ;
 - strInsert += t_nl.Text + ", " ;
 - strInsert += t_books.Text + ")" ;
 - OleDbCommand inst = new OleDbCommand ( strInsert , myConn ) ;
 - inst.ExecuteNonQuery ( ) ;
 - myConn.Close ( ) ;
 - myDataSet.Tables [ "person" ] . Rows [ myBind.Position ] . BeginEdit ( ) ;
 - myDataSet.Tables [ "person" ] . Rows [ myBind.Position ] . EndEdit ( ) ;
 - myDataSet.Tables [ "person" ] . AcceptChanges ( ) ;
 - }
 - else
 - {
 - MessageBox.Show ( "必須填滿(mǎn)所有字段值!" , "錯(cuò)誤!" ) ;
 - }
 - }
 - catch ( Exception ed )
 - {
 - MessageBox.Show ( "保存數(shù)據(jù)記錄發(fā)生 " + ed.ToString ( ) , "錯(cuò)誤!" ) ;
 - }
 - }
 - protected void Update_record ( object sender , System.EventArgs e )
 - {
 - int i = myBind.Position ;
 - try{
 - file://連接到一個(gè)數(shù)據(jù)庫(kù)
 - string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = db.mdb " ;
 - OleDbConnection myConn = new OleDbConnection ( strCon ) ;
 - myConn.Open ( ) ;
 - myDataSet.Tables [ "person" ] . Rows [ myBind.Position ] . BeginEdit ( ) ;
 - file://從數(shù)據(jù)庫(kù)中修改指定記錄
 - string strUpdt = " UPDATE person SET xm = '"
 - + t_xm.Text + "' , xb = '"
 - + t_xb.Text + "' , nl = "
 - + t_nl.Text + " , zip = "
 - + t_books.Text + " WHERE id = " + t_id.Text ;
 - OleDbCommand myCommand = new OleDbCommand ( strUpdt , myConn ) ;
 - myCommand.ExecuteNonQuery ( ) ;
 - myDataSet.Tables [ "person" ] . Rows [ myBind.Position ] . EndEdit ( ) ;
 - myDataSet.Tables [ "person" ] . AcceptChanges ( ) ;
 - myConn.Close ( ) ;
 - }
 - catch ( Exception ed )
 - {
 - MessageBox.Show ( "修改指定記錄錯(cuò)誤: " + ed.ToString ( ) , "錯(cuò)誤!" ) ;
 - }
 - myBind.Position = i ;
 - }
 - protected void Delete_record ( object sender , System.EventArgs e )
 - {
 - DialogResult r = MessageBox.Show ( "是否刪除當(dāng)前記錄!" , "刪除當(dāng)前記錄!" ,
 - MessageBoxButtons.YesNo, MessageBoxIcon.Question ) ;
 - int ss = ( int ) r ;
 - if ( ss == 6 ) // 按動(dòng)"確定"按鈕
 - {
 - try{
 - file://連接到一個(gè)數(shù)據(jù)庫(kù)
 - string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = db.mdb " ;
 - OleDbConnection myConn = new OleDbConnection ( strCon ) ;
 - myConn.Open ( ) ;
 - string strDele = "DELETE FROM person WHERE id= " + t_id.Text ;
 - OleDbCommand myCommand = new OleDbCommand ( strDele , myConn ) ;
 - file://從數(shù)據(jù)庫(kù)中刪除指定記錄
 - myCommand.ExecuteNonQuery ( ) ;
 - file://從DataSet中刪除指定記錄
 - myDataSet.Tables [ "person" ] . Rows [ myBind.Position ] . Delete ( ) ;
 - myDataSet.Tables [ "person" ] . AcceptChanges ( ) ;
 - myConn.Close ( ) ;
 - }
 - catch ( Exception ed )
 - {
 - MessageBox.Show ( "刪除記錄錯(cuò)誤信息: " + ed.ToString ( ) , "錯(cuò)誤!" ) ;
 - }
 - }
 - }
 - file://按鈕"尾記錄"對(duì)象事件程序
 - protected void GoLast ( object sender , System.EventArgs e )
 - {
 - myBind.Position = myBind.Count - 1 ;
 - }
 - file://按鈕"下一條"對(duì)象事件程序
 - protected void GoNext ( object sender , System.EventArgs e )
 - {
 - if ( myBind.Position == myBind.Count -1 )
 - MessageBox.Show ( "已經(jīng)到了最后一條記錄!", "信息提示!" ,
 - MessageBoxButtons.OK , MessageBoxIcon.Information
 - ) ;
 - else
 - myBind.Position += 1 ;
 - }
 - file://按鈕"上一條"對(duì)象事件程序
 - protected void GoPrevious ( object sender , System.EventArgs e )
 - {
 - if ( myBind.Position == 0 )
 - MessageBox.Show ( "已經(jīng)到了第一條記錄!" , "信息提示!" ,
 - MessageBoxButtons.OK , MessageBoxIcon.Information
 - ) ;
 - else
 - myBind.Position -= 1 ;
 - }
 - file://按鈕"首記錄"對(duì)象事件程序
 - protected void GoFirst ( object sender , System.EventArgs e )
 - {
 - myBind.Position = 0 ;
 - }
 - }
 
對(duì)于以SqlServer2000數(shù)據(jù)庫(kù)為模型的程序代碼,只要把Data01.cs中的數(shù)據(jù)鏈接,即:
stringmyConn1="Provider=Microsoft.Jet.OLEDB.4.0;DataSource=db.mdb";
改換成:
stringstrCon="Provider=SQLOLEDB.1;PersistSecurityInfo=False;UserID=sa;InitialCatalog=data1;DataSource=server1";
注釋?zhuān)捍藬?shù)據(jù)鏈接代表的意思是:打開(kāi)Sqlserver數(shù)據(jù)庫(kù),服務(wù)器名稱(chēng)為server1,數(shù)據(jù)庫(kù)為data1就可以得到VisualC#針對(duì)SqlServer2000數(shù)據(jù)庫(kù)為模板編程的完成源程序代碼了。所以本文就不再提供了。
七.精通C#數(shù)據(jù)庫(kù)編程總結(jié):
數(shù)據(jù)庫(kù)編程始終是程序編程內(nèi)容中的一個(gè)重點(diǎn)和難點(diǎn)。而以上介紹的這些操作又是數(shù)據(jù)庫(kù)編程中最為基本,也是最為重要的內(nèi)容。那些復(fù)雜的編程無(wú)非是以上這些處理的若干個(gè)疊加。
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