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Applies to: Access 2013, Office 2013
This example demonstrates the Prepared property by opening two Command objects — one prepared and one not prepared.
// BeginPreparedJ
import com.ms.wfc.data.*;
import java.io.* ;
public class PreparedX
{
// The main entry point for the application.
public static void main (String[] args)
{
PreparedX();
System.exit(0);
}
// PreparedX function
static void PreparedX()
{
// Define string variables.
String strCnn = "Provider='sqloledb';Data Source='MySqlServer';"
+ "Initial Catalog='Pubs';Integrated Security='SSPI';";
String strCmd = "SELECT title, type FROM Titles ORDER BY type";
// Define ADO Objects.
Connection cnConn1 = null;
Command cmd1 = null;
Command cmd2 = null;
// Declarations.
BufferedReader in =
new BufferedReader (new InputStreamReader(System.in));
long timeStart;
long timeEnd;
float timeNotPrepared ;
float timePrepared;
int intLoop;
String strTemp;
try
{
// Open a connection.
cnConn1 = new Connection();
cnConn1.open(strCnn);
// Create two command objects for the same
// command - one prepared and one not prepared.
cmd1 = new Command();
cmd1.setActiveConnection(cnConn1);
cmd1.setCommandType(AdoEnums.CommandType.TEXT);
cmd1.setCommandText(strCmd);
cmd2 = new Command();
cmd2.setActiveConnection(cnConn1);
cmd2.setCommandType(AdoEnums.CommandType.TEXT);
cmd2.setCommandText(strCmd);
cmd2.setPrepared(true);
// Set a timer, then execute the unprepared
// command 20 times.
timeStart = System.currentTimeMillis();
for ( intLoop = 0; intLoop < 20; intLoop++)
cmd1.execute();
timeEnd = System.currentTimeMillis();
timeNotPrepared =(float)(timeEnd - timeStart)/1000f;
// Reset the timer, then execute the prepared
// command 20 times.
timeStart = System.currentTimeMillis();
for ( intLoop = 0; intLoop < 20; intLoop++)
cmd2.execute();
timeEnd = System.currentTimeMillis();
timePrepared =(float)(timeEnd - timeStart)/1000f;
// Display performance results.
System.out.println("\nPerformance Results:");
System.out.println("\n\tNot Prepared: " + timeNotPrepared +
" seconds");
System.out.println("\n\tPrepared: " + timePrepared +
" seconds");
System.out.println("\n\nPress <Enter> to continue..");
in.readLine();
}
catch( AdoException ae )
{
// Notify user of any errors that result from ADO.
// As passing a Connection, check for null pointer first.
if (cnConn1!= null)
{
PrintProviderError(cnConn1);
}
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 (cnConn1 != null)
if (cnConn1.getState() == 1)
cnConn1.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");
}
}
// EndPreparedJ