jdbc连接数据库与处理事物

public class OrderTest {
    private String driver = "com.mysql.jdbc.Driver";
    private String url = "jdbc:mysql://localhost:3306/os?useUnicode=true&characterEncoding=utf8";
    private String userName = "root";
    private String password = "root";

    @Test
    public void addOrder(){
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        Connection connection = null;
        try {
            connection = DriverManager.getConnection(url,userName,password);
            connection.setAutoCommit(false);
            Statement statement = connection.createStatement();
            statement.execute("insert into orders values('100002','100001',2,2499,now(),null,null,'刘备','1330000000','成都','待发货')");
            statement.execute("update products set stck=stock-2 where id='100001'");
            statement.close();
            connection.commit();
        } catch (SQLException e) {
            e.printStackTrace();
            try {
                connection.rollback();
            } catch (SQLException e1) {
                e1.printStackTrace();
            }
        }finally {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }
}