public void SelectBD(String Banco)
{
    BANCO = Banco;
    if (BANCO.equals("SQL"))
    {
        //CONEXAO SQL EXPRESS
        URL     = "jdbc:jtds:sqlserver://localhost:1433/BancoSQL;";
        DRIVER  = "net.sourceforge.jtds.jdbc.Driver";
        USUARIO = "sa";
        SENHA   = "123456";
    }
    else if(BANCO.equals("ORACLE"))
    {
        //CONEXAO ORACLE EXPRESS
        URL     = "jdbc:oracle:thin:@localhost:1521:xe";
        DRIVER  = "oracle.jdbc.driver.OracleDriver";
        USUARIO = "android"; //"sys as sysdba";
        SENHA   = "123456";
    }
}

public Statement ponte;
public String status = "";
public String getStatus()
{
    return status;
}

    public Conexao()
{
    try {
        System.out.println("Banco "+ BANCO);
        SelectBD(BANCO);
        if (BANCO.equals("SQL"))
        {
            Class.forName(DRIVER);
            Connection con;
            con = DriverManager.getConnection(URL,USUARIO,SENHA);
            ponte = con.createStatement();
        }
        else if(BANCO.equals("ORACLE"))
        {
            Class.forName(DRIVER);
            Connection con;
            OracleDataSource ds;
            ds = new OracleDataSource();
            ds.setURL(URL);
            con = ds.getConnection(USUARIO,SENHA);
            ponte = con.createStatement();
        }
        status = "Conectado no banco " + BANCO + "!!!" ;
    } catch (Exception e) {
        status = e.getMessage();
        e.printStackTrace();
    }
}

public void manutencao(String sql)
{
    try {
        ponte.executeUpdate(sql);
    } catch (Exception e) {
        e.printStackTrace();
    }
}