import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import javax.swing.JOptionPane;

public class Conexao {
    private static Connection connection;
    private static final String DRIVER = "oracle.jdbc.driver.OracleDriver";
    private static final String URL = "jdbc:oracle:thin:@oracle.fiap.com.br:1521:ORCL";
    private static final String USUARIO = "rm75690";
    private static final String SENHA = "";

    private Conexao() {}

    public static synchronized Connection getConnection() {
        if(connection == null) {
            try {
                Class.forName(DRIVER);
                connection = DriverManager.getConnection(URL, USUARIO, SENHA);
            }
            catch(ClassNotFoundException e) {
                JOptionPane.showMessageDialog(null, "Erro ao carregar o driver de conexão\n"+e);
            }
            catch(SQLException e) {
                JOptionPane.showMessageDialog(null, "Erro ao estabelecer conexão com o banco de dados\n"+e);
            }
        }
        return connection;
    }
}