Source-Eigenschaft (Beispiel) (VJ++)

Gilt für: Access 2013, Office 2013

Dieses Beispiel veranschaulicht die Source-Eigenschaft, indem drei Recordset-Objekte geöffnet werden, die auf unterschiedlichen Datenquellen basieren.

 
// BeginSourceJ 
import java.io.*; 
import com.ms.wfc.data.*; 
 
public class SourceX 
{ 
 // The main entry point of the application. 
 public static void main (String[] args) 
 { 
 SourceX(); 
 System.exit(0); 
 } 
 // SourceX Function 
 static void SourceX() 
 { 
 // Define string variables. 
 String strCnn = "Provider='sqloledb';Data Source='MySqlServer';" + 
 "Initial Catalog='Pubs';Integrated Security='SSPI';"; 
 String strSQL = "SELECT title_ID AS TitleID, title AS Title,"+ 
 "publishers.pub_id AS PubID, pub_name AS PubName "+ 
 "FROM publishers INNER JOIN Titles "+ 
 "ON publishers.pub_id=Titles.pub_id "+ 
 "ORDER BY Title"; 
 
 // Define ADO Objects. 
 Connection cnn1 = null; 
 Recordset rstTitles = null; 
 Recordset rstPublishers = null; 
 Recordset rstPublishersDirect = null; 
 Recordset rstTitlesPublishers = null; 
 Command cmdSQL = null; 
 
 // Declarations. 
 BufferedReader in = 
 new BufferedReader(new InputStreamReader(System.in)); 
 
 try 
 { 
 // Open a connection. 
 cnn1 = new Connection(); 
 cnn1.open(strCnn); 
 
 // Open a recordset based on a command object. 
 cmdSQL = new Command(); 
 cmdSQL.setActiveConnection(cnn1); 
 cmdSQL.setCommandText("Select title,type,pubdate " + 
 "FROM Titles ORDER BY title"); 
 
 rstTitles = new Recordset(); 
 rstTitles = cmdSQL.execute(); 
 
 // Open a recordset based on a table. 
 rstPublishers = new Recordset(); 
 rstPublishers.open("publishers", strCnn, 
 AdoEnums.CursorType.FORWARDONLY, AdoEnums.LockType.READONLY, 
 AdoEnums.CommandType.TABLE); 
 
 // Open a recordset based on a table. 
 rstPublishersDirect = new Recordset(); 
 rstPublishersDirect.open("publishers", strCnn, 
 AdoEnums.CursorType.FORWARDONLY, AdoEnums.LockType.READONLY, 
 AdoEnums.CommandType.TABLEDIRECT); 
 
 // Open a recordset based on an SQL String. 
 rstTitlesPublishers = new Recordset(); 
 
 rstTitlesPublishers.open(strSQL, strCnn, 
 AdoEnums.CursorType.FORWARDONLY, AdoEnums.LockType.READONLY, 
 AdoEnums.CommandType.TEXT); 
 
 // Use Source property to display the source of each recordset. 
 System.out.println("\nrstTitles source: \n"+ 
 rstTitles.getSource()); 
 System.out.println("\nrstPublishers source: \n"+ 
 rstPublishers.getSource()); 
 System.out.println("\nrstPublishersDirect source:\n" + 
 rstPublishersDirect.getSource() ); 
 System.out.println("\nrstTitlesPublishers source: \n" + 
 rstTitlesPublishers.getSource()); 
 
 System.out.println("\n\nPress <Enter> to continue.."); 
 in.readLine(); 
 } 
 catch(AdoException ae) 
 { 
 // Notify the user of any errors that result from ADO. 
 
 // As passing a recordset, check for null pointer first. 
 
 if(rstPublishers != null) 
 { 
 PrintProviderError(rstPublishers.getActiveConnection()); 
 } 
 else if(rstPublishersDirect != null) 
 { 
 PrintProviderError( 
 rstPublishersDirect.getActiveConnection()); 
 } 
 else if(rstTitles != null) 
 { 
 PrintProviderError(rstTitles.getActiveConnection()); 
 } 
 else if(rstTitlesPublishers != null) 
 { 
 PrintProviderError( 
 rstTitlesPublishers.getActiveConnection()); 
 } 
 else 
 System.out.println("Exception: " + ae.getMessage()); 
 
 } 
 // System read requires this catch. 
 catch(java.io.IOException je) 
 { 
 PrintIOError(je); 
 } 
 
 finally 
 { 
 // Cleanup objects before exit. 
 if (rstTitles != null) 
 if (rstTitles.getState() == 1) 
 rstTitles.close(); 
 if (rstPublishers != null) 
 if (rstPublishers.getState() == 1) 
 rstPublishers.close(); 
 if (rstPublishersDirect != null) 
 if (rstPublishersDirect.getState() == 1) 
 rstPublishersDirect.close(); 
 if (rstTitlesPublishers != null) 
 if (rstTitlesPublishers.getState() == 1) 
 rstTitlesPublishers.close(); 
 if (cnn1 != null) 
 if (cnn1.getState() == 1) 
 cnn1.close(); 
 } 
 
 } 
 // PrintProviderError Function 
 
 static void PrintProviderError( Connection Cnn1 ) 
 { 
 // Print Provider errors from Connection object. 
 // ErrItem is an item object in the Connections Errors collection. 
 com.ms.wfc.data.Error ErrItem = null; 
 long nCount = 0; 
 int i = 0; 
 
 nCount = Cnn1.getErrors().getCount(); 
 
 // If there are any errors in the collection, print them. 
 if( nCount > 0); 
 { 
 // Collection ranges from 0 to nCount - 1 
 for (i = 0; i< nCount; i++) 
 { 
 ErrItem = Cnn1.getErrors().getItem(i); 
 System.out.println("\t Error number: " + ErrItem.getNumber() 
 + "\t" + ErrItem.getDescription() ); 
 } 
 } 
 
 } 
 
 // PrintIOError Function 
 
 static void PrintIOError( java.io.IOException je) 
 { 
 System.out.println("Error \n"); 
 System.out.println("\tSource = " + je.getClass() + "\n"); 
 System.out.println("\tDescription = " + je.getMessage() + "\n"); 
 } 
} 
// EndSourceJ