JTable

package br.com.siscom.view;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.table.AbstractTableModel;
import br.com.siscom.dao.Conexao;

public class Tabela extends AbstractTableModel {
	private Connection conexao;

	private Statement statement;

	private ResultSet resultset;

	private ResultSetMetaData metadata;

	private int linha;

	private String query;
	public Tabela(final String query) throws SQLException, ClassNotFoundException {

		conexao = Conexao.getConnection();
		statement = conexao.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
				ResultSet.CONCUR_READ_ONLY);

		setQuery(query);

	}

	public Class getColumnClassName(final int column) {

		try {
			final String className = metadata.getColumnClassName(column + 1);
			return Class.forName(className);

		} catch (final Exception exception) {
			exception.printStackTrace();
		}

		return Object.class;
	}

	public int getColumnCount() {
		try {
			return metadata.getColumnCount();

		} catch (final SQLException sqlexception) {
			sqlexception.printStackTrace();
		}
		return 0;
	}

	public String getColumnName(final int column) {
		try {
			return metadata.getColumnName(column + 1);

		} catch (final SQLException sqlexception) {
			sqlexception.printStackTrace();
		}
		return "";
	}

	protected void finalize() {

		try {
			statement.close();
			conexao.close();
		} catch (final SQLException sqlexception) {
			sqlexception.printStackTrace();
		}
	}

	public int intgetRowCount() {
		return linha;
	}

	public Object getValueAt(final int row, final int column) {
		try {
			resultset.absolute(row + 1);
			return resultset.getObject(column + 1);
		} catch (final SQLException sqlexception) {
			sqlexception.printStackTrace();
		}
		return "";
	}

	public void refresh() throws SQLException {

		setQuery(query);
	}

	public void setQuery(final String qry) throws SQLException {

		query = qry;
		resultset = statement.executeQuery(qry);
		metadata = resultset.getMetaData();
		resultset.last();
		linha = resultset.getRow();
		fireTableStructureChanged();

	}

	public int getRowCount() {
		// TODO Auto-generated method stub
		return 0;
	}
}

private JTable JTable = null;
	private Tabela tabela;



private JTable getJTable() {
		String query = "Select nome, cpf, rg from funcionario";
		try {
			tabela = new Tabela(query);

		} catch (ClassNotFoundException classNotfound) {
			JOptionPane.showMessageDialog(null, "Driver não encontrado",
					"Erro encontrado", JOptionPane.ERROR_MESSAGE);

		} catch (SQLException sqlex) {
			JOptionPane.showMessageDialog(null, "Erro na SQL",
					"Erro encontrado", JOptionPane.ERROR_MESSAGE);

		}
		if (JTable == null) {
			JTable = new JTable(tabela);

		}
		return JTable;
	}

SELECT nome as nome_cliente, cpf as CPF, rg as RG
FROM funcionario