頂級類和接口的設計

/**
 * @ClassName: GenericDao
 * @Description: 全部自定義Dao的頂級接口, 封裝經常使用的增刪查改操做
 * Entity : 表明數據庫中的表 映射的Java對象類型
 * PK :表明對象的主鍵類型
 * Page:分頁對象
 * @author: yaozhenhua
 * @date: 2019/3/20 11:08
 */
public interface GenericDao<Entity, PK, Page> {
    /**
     * 插入對象
     *
     * @param entity
     * @author: yaozhenhua  2019/3/20 11:14
     */
    int insertSelective(Entity entity);
    
    /**
     *更新對象
     *
     * @param entity
     * @author: yaozhenhua  2019/3/20 11:16
     */
    int updateSelectiveByPrimaryKey(Entity entity);
    
    /**
     *經過主鍵刪除對象
     *
     * @param id
     * @author: yaozhenhua  2019/3/20 11:18
     */
    int deleteByPrimaryKey(@Param(value = "id") PK id);
    
    /**
     *經過主鍵查詢對象
     *
     * @param id
     * @author: yaozhenhua  2019/3/20 11:20
     */
    Entity selectByPrimaryKey(@Param(value = "id") PK id);
    
    /**
     *查詢列表
     *
     * @param
     * @author: yaozhenhua  2019/3/20 11:26
     */
    List<Entity> listSelective();
    
    /**
     *分頁查詢列表
     *
     * @param page
     * @author: yaozhenhua  2019/3/20 11:26
     */
    List<Entity> listSelectiveByPage(Page page);
    
    /**
     *查詢個數
     *
     * @param
     * @author: yaozhenhua  2019/3/20 11:28
     */
    int countSelective();
    
}

/** * @ClassName: GenericService * @Description: 全部自定義Service的頂級接口, 封裝經常使用的增刪查改操做 * @author: yaozhenhua * @date: 2019/3/20 11:29 */public abstract class GenericService<Entity, PK, Page> {    public abstract GenericDao<Entity, PK, Page> getDao();        /**     *插入對象     *     * @param entity     * @author: yaozhenhua  2019/3/20 12:07     */    public int insert(Entity entity){        return getDao().insertSelective(entity);    }    /**     *更新對象     *     * @param entity     * @author: yaozhenhua  2019/3/20 12:09     */    public int update(Entity entity){        return getDao().updateSelectiveByPrimaryKey(entity);    }        /**     *刪除對象     *     * @param id     * @author: yaozhenhua  2019/3/20 12:10     */    public int delete(PK id){        return getDao().deleteByPrimaryKey(id);    }        /**     *經過主鍵, 查詢對象     *     * @param id     * @author: yaozhenhua  2019/3/20 12:11     */    public Entity selectById(PK id){        return getDao().selectByPrimaryKey(id);    }        /**     *查詢列表     *     * @param     * @author: yaozhenhua  2019/3/20 12:13     */    public List<Entity> listSelective(){        return getDao().listSelective();    }        /**     *查詢列表並分頁     *     * @param page     * @author: yaozhenhua  2019/3/20 12:14     */    public List<Entity> listSelectiveByPage(Page page){        return getDao().listSelectiveByPage(page);    }        /**     *查詢個數     *     * @param     * @author: yaozhenhua  2019/3/20 12:15     */    public int countSelective(){        return getDao().countSelective();    }}