Iva !!
A classe abaixo implementa uma janela com 2
frames.
- uma para digitar um comando sql simples
(select)
- outra que mostrará o resultado do
select.
OBS: Esta classe acessa o Postgre. Nao tenho
disponível no momento a string de conexao ao Access.
T+,
import java.sql.*;import
javax.swing.*;import java.awt.*;import java.awt.event.*;import
java.util.*;
public class Display extends JFrame
{ // java.sql types needed for database
processing private Connection connection;
private Statement statement; private ResultSet
resultSet; private ResultSetMetaData rsMetaData;
// javax.swing types needed for
GUI private JTable table; private JTextArea
inputQuery; private JButton submitQuery;
public Display() {
super( "Enter Query. Click Submit to See
Results." );
// The URL
specifying the Books database to which // this
program connects using JDBC to connect to a //
Microsoft ODBC database. String url =
"";
String username = "postgres"; String password
= "";
// Load the driver
to allow connection to the database try
{ Class.forName(
"org.postgresql.Driver" );
connection = DriverManager.getConnection(
url,
username, password ); }
catch ( ClassNotFoundException cnfex )
{ System.err.println(
"Failed
to load driver." );
cnfex.printStackTrace();
System.exit( 1 ); // terminate program
} catch ( SQLException sqlex )
{ System.err.println(
"Unable to connect" );
sqlex.printStackTrace();
System.exit( 1 ); // terminate program
}
// If connected to
database, set up GUI
inputQuery
= new JTextArea( "SELECT *
FROM clientes", 4, 30 ); submitQuery = new
JButton( "Submit query" );
submitQuery.addActionListener(
new ActionListener()
{ public
void actionPerformed( ActionEvent e )
{
getTable();
} }
);
JPanel topPanel =
new JPanel(); topPanel.setLayout( new
BorderLayout() ); topPanel.add( new
JScrollPane( inputQuery),
BorderLayout.CENTER ); topPanel.add(
submitQuery, BorderLayout.SOUTH );
table = new JTable( 4, 4 );
Container c =
getContentPane(); c.setLayout( new
BorderLayout() ); c.add( topPanel,
BorderLayout.NORTH ); c.add( table,
BorderLayout.CENTER );
getTable();
setSize( 500, 500
); show(); }
private void
getTable() { try
{ String query =
inputQuery.getText();
statement =
connection.createStatement();
resultSet = statement.executeQuery( query
);
displayResultSet( resultSet
); } catch (
SQLException sqlex ) {
sqlex.printStackTrace(); }
}
private void displayResultSet(
ResultSet rs ) throws
SQLException { // position to
first record boolean moreRecords =
rs.next();
// If there are no
records, display a message if ( ! moreRecords
) {
JOptionPane.showMessageDialog( this,
"ResultSet contained no records"
); setTitle( "No records to
display" );
return; }
Vector columnHeads =
new Vector(); Vector rows = new
Vector();
try
{ // get column
heads ResultSetMetaData rsmd
= rs.getMetaData();
for ( int i = 1; i =
rsmd.getColumnCount(); ++i )
columnHeads.addElement( rsmd.getColumnName( i ) );
//
get row data do
{
rows.addElement( getNextRow( rs, rsmd ) );
} while ( rs.next()
);
//
display table with ResultSet
contents table = new JTable(
rows, columnHeads );
JScrollPane scroller = new JScrollPane( table
); Container c =
getContentPane(); c.remove(
1 ); c.add( scroller,
BorderLayout.CENTER );
c.validate();
} catch ( SQLException sqlex )
{
sqlex.printStackTrace(); }
}
private Vector getNextRow( ResultSet
rs,
ResultSetMetaData rsmd ) throws
SQLException { Vector
currentRow = new Vector();
for ( int i = 1; i =
rsmd.getColumnCount(); ++i )
switch( rsmd.getColumnType( i ) )
{ case
Types.VARCHAR:
case
Types.LONGVARCHAR:
currentRow.addElement( rs.getString( i )
);
break;
case
Types.INTEGER:
currentRow.addElement(
new Long( rs.getLong( i ) )
);
break;
default:
System.out.println( "Type was: " +
rsmd.getColumnTypeName( i )
);
} return
currentRow; }
public void shutDown()
{ try
{
connection.close();
} catch ( SQLException sqlex )
{ System.err.println(
"Unable to disconnect" );
sqlex.printStackTrace(); }
}
public static void main( String args[]
) { final Display app = new
Display();
app.addWindowListener( new
WindowAdapter()
{ public
void windowClosing( WindowEvent e )
{
app.shutDown();
System.exit( 0
);
}
} );
}}
- Original Message -
From:
iva
conte
To: [EMAIL PROTECTED]
Sent: Tuesday, July 01, 2003 5:11
PM
Subject: [java-list] JAVA E ACCESS
POR FAVOR!
ESTOW TENTANDO APRENDER A FAZER COM Q UM PROJETO JAVA POSSA
SE COMUNICAR COM UM BANCO DE DADOS EM ACCESS! MAS NAUM TENHU A MENOR IDEIA D
COMO FUNCIONA!
ALGUEM PODERIA ME DAR UMA AJUDA? QUAL O PACOTE Q FAZ ISSO?
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