/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package jjavadb;
import java.awt.Container;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
/**
*
* @author ritesh
*/
public class Main extends JFrame{
public Main() throws SQLException
{super("Database of Students");
try {
Class.forName("org.apache.derby.jdbc.ClientDriver");
} catch (ClassNotFoundException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
Connection connection = DriverManager.getConnection( "jdbc:derby://localhost:1527/Jaane","hello","Hello" );
Statement statement = connection.createStatement();
ResultSet resultSet =
statement.executeQuery( "SELECT * FROM COLLEAGUES" );
StringBuffer results = new StringBuffer();
ResultSetMetaData metaData = resultSet.getMetaData();
int numberOfColumns = metaData.getColumnCount();
for ( int i = 1; i <= numberOfColumns; i++ ) {
results.append( metaData.getColumnName( i ) + "\t" );
}
results.append( "\n" );
while ( resultSet.next() ) {
for ( int i = 1; i <= numberOfColumns; i++ ) {
results.append( resultSet.getObject( i ) );
results.append("\t"); }
}
// close statement and connection
statement.close();
connection.close();
// set up GUI and display window
JTextArea textArea = new JTextArea( "Hello");
Container container = getContentPane();
container.add( new JScrollPane( textArea ) );
setSize( 300, 100 ); // set window size
setVisible( true );
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
Main window = null;
try {
window = new Main();
} catch (SQLException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
и я получаю эту ошибку
Mar 31, 2011 12:42:37 PM jjavadb.Main <init>
SEVERE: null
java.lang.ClassNotFoundException: org.apache.derby.jdbc.ClientDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at jjavadb.Main.<init>(Main.java:29)
at jjavadb.Main.main(Main.java:78)
Mar 31, 2011 12:42:37 PM jjavadb.Main main
SEVERE: null
java.sql.SQLException: No suitable driver found for jdbc:derby://localhost:1527/sample
at java.sql.DriverManager.getConnection(DriverManager.java:602)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at jjavadb.Main.<init>(Main.java:34)
at jjavadb.Main.main(Main.java:78)
Exception in thread "main" java.lang.NullPointerException
at jjavadb.Main.main(Main.java:82)
Java Result: 1
BUILD SUCCESSFUL (total time: 2 seconds)
пожалуйста, помогите устранить эту ошибку. Я создал базу данных с именем пользователя hello и паролем. Здравствуйте, пожалуйста, удалите ошибку. Пожалуйста, помогите .............