求助 数据类型.

[eacc31]

rh有问题.
The method query(String, RsHandler<capture#2-of ?>, Object...) in the type QR<capture#2-of ?> is not applicable for the arguments (String, RsHandler<Stu>, Object[])

	public Stu load(String id) {
		QR<?> qr = new QR<>(C3P0.getDataSource());
		String sql = "select * from stu where id=?";
		Object[] params = { id };

		RsHandler<Stu> rh = new RsHandler<Stu>() {
			public Stu handler(ResultSet result) {
				if (!result.next())
					return null;
				Stu stu = new Stu();
				stu.setId(result.getString("id"));
				stu.setName(result.getString("name"));
				stu.setSex(result.getString("sex"));
				return stu;
			}

		};

		return (Stu) qr.query(sql, rh, params);
	}

定义的接口

public interface RsHandler<T> {
	public T handler(ResultSet result) throws RuntimeException;

}

query 方法

	public T query(String sql, RsHandler<T> rh, Object... params) {
		Connection con = null;
		PreparedStatement psmt = null;
		ResultSet result = null;
		try {
			con = dataSource.getConnection();// 通过连接池得到链接对象
			psmt = con.prepareStatement(sql);// 使用sql创建psmt

			initParams(psmt, params);// 设置参数

			result = psmt.executeQuery();// 执行

			return rh.handler(result);

		} catch (Exception e) {
			throw new RuntimeException(e);
		} finally {
			try {
				if (psmt != null)
					psmt.close();
				if (con != null)
					con.close();
			} catch (SQLException e) {
			}
		}

	}

[Coder_D]

params是个可变长参数，传多个的话，直接逗号分开就好了，内部会处理成数组，不需要你直接传数组进去