java中JDBC连接数据库遇到问题

Question

Java连接到数据库db01，给数据库db01中的表actor添加一条语句，
没有报错，也能正常运行，但是添加的汉字字段姓名、性别两列在数据库中显示的是‘？’
出现这种问题是什么原因呢？

public class jdbc01 {
    public static void main(String[] args) throws SQLException {
        //1.注册驱动
        Driver driver = new Driver();
        //2.得到链接
        String url = "jdbc:mysql://localhost:3306/db01";
        Properties properties = new Properties();
        properties.setProperty("user","root");
        properties.setProperty("password","123456");
        Connection connect = driver.connect(url,properties);

        //3."
        String sql="insert into actor values(null,'刘德华','男','1999-02-19','123')";
        Statement statement = connect.createStatement();
        int rows = statement.executeUpdate(sql);
        System.out.println(rows > 0 ? "成功" : "失败");

        statement.close();
        connect.close();

    }
}

Answer 1

数据库字符集编码是什么格式呢，连接后边加个编码格式试试 characterEncoding=utf-8什么的