DAOException 和ServiceException

最新推荐文章于 2023-12-31 09:05:54 发布

原创最新推荐文章于 2023-12-31 09:05:54 发布 · 7.1k 阅读

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文章标签：

#string #hibernate #数据库 #exception #spring #class

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这篇博客介绍了在使用Hibernate和Spring时，如何自定义`DaoException`和`ServiceException`来处理业务异常。`DaoException`是在数据访问层抛出的异常，通常用于捕获SQL执行错误；`ServiceException`则在服务层抛出，用于封装整个业务流程中出现的异常。在示例代码中展示了在Dao层和Service层如何使用这两个异常。

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后期用到hibernate和spring可能就不需要这些了

1.DAOException

package com.neusoft.trainingcenter.hr.utils;

public class DaoException extends RuntimeException {

    /**
    *
    */
    private static final long serialVersionUID = 1L;

    public DaoException() {
    }

    public DaoException(String arg0) {
        super(arg0);
    }

    public DaoException(Throwable arg0) {
        super(arg0);
    }

    public DaoException(String arg0, Throwable arg1) {
        super(arg0, arg1);
    }

}
2.ServiceException

package com.neusoft.trainingcenter.hr.utils;

public class ServiceException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    public ServiceException() {
    }

    public ServiceException(String arg0) {
        super(arg0);
    }

    public ServiceException(Throwable arg0) {
        super(arg0);
    }

    public ServiceException(String arg0, Throwable arg1) {
        super(arg0, arg1);
    }

}

3.Dao层的demo:

    /**
    * 增加部门
    *
    * @param section
    *            section对象
    */
    public void addSection(Section section) {
        String sql = "insert into section(" + "snumber,"        // 标识符
                                            + "sno,"             // 部门编号
                                            + "sname,"             // 部门名称
                                            + "stype,"             // 部门类型
                                            + "sphone,"         // 电话
                                            + "sfax,"             // 传真
                                            + "sdes,"             // 描述
                                            + "supper,"         // 上级部门
                                            + "s_setdate)"         // 成立日期
                                            + "values(s.nextval, ?, ?, ?, ?, ?, ?, ?, ?)";
        PreparedStatement pstmt = null;

        try {
            pstmt = connection.prepareStatement(sql);
            pstmt.setString(1, section.getSno());
            pstmt.setString(2, section.getSname());
            pstmt.setString(3, section.getStype());
            pstmt.setString(4, section.getSphone());
            pstmt.setString(5, section.getSfax());
            pstmt.setString(6, section.getSdes());
            pstmt.setString(7, section.getSupper());
            pstmt.setDate(8, section.getSdate());
            pstmt.executeUpdate();
        } catch (SQLException e) {
            throw new DaoException("Error on adding section", e);
        } finally {
            DBUtils.closeStatement(pstmt);
        }
    }

4:service层demo:

    public void addSection(Section section) {

        // 数据库连接
        // 声明一个部门数据访问对象
        // 开始数据库交互
        // 调用增加部门方法
        // 数据库提交
        // 捕捉该过程中异常

        Connection conn = null;
        try {
            conn = DBUtils.getConnection();
            SectionDao sectionDao = new SectionDaoImpl(conn);
            DBUtils.beginTransaction(conn);
            sectionDao.addSection(section);
            DBUtils.commit(conn);
        } catch (ServiceException e) {
            throw e;
        } catch (Exception e) {
            DBUtils.rollback(conn);
            throw new ServiceException("添加部门错误", e);
        } finally {
            DBUtils.closeConnection(conn);
        }
    }