Appfuse：扩展自己的GenericManager

通过代码生成机制的appfuse访问数据都通过GenericManager来实现，GenericManager默认提供了以下几个方法：

 1 package org.appfuse.service; 2  3 import java.io.Serializable; 4 import java.util.List; 5  6 /** 7  * Generic Manager that talks to GenericDao to CRUD POJOs. 8  * 9  * <p>Extend this interface if you want typesafe (no casting necessary) managers10  * for your domain objects.11  *12  * @author <a href="mailto:matt@raibledesigns.com">Matt Raible</a>13  *  Updated by jgarcia: added full text search + reindexing14  * @param <T> a type variable15  * @param <PK> the PRimary key for that type16  */17 public interface GenericManager<T, PK extends Serializable> {18 19     /**20      * Generic method used to get all objects of a particular type. This21      * is the same as lookup up all rows in a table.22      * @return List of populated objects23      */24     List<T> getAll();25 26     /**27      * Generic method to get an object based on class and identifier. An28      * ObjectRetrievalFailureException Runtime Exception is thrown if29      * nothing is found.30      *31      * @param id the identifier (primary key) of the object to get32      * @return a populated object33      * @see org.springframework.orm.ObjectRetrievalFailureException34      */35     T get(PK id);36 37     /**38      * Checks for existence of an object of type T using the id arg.39      * @param id the identifier (primary key) of the object to get40      * @return - true if it exists, false if it doesn't41      */42     boolean exists(PK id);43 44     /**45      * Generic method to save an object - handles both update and insert.46      * @param object the object to save47      * @return the updated object48      */49     T save(T object);50 51     /**52      * Generic method to delete an object53      * @param object the object to remove54      */55     void remove(T object);56 57     /**58      * Generic method to delete an object based on class and id59      * @param id the identifier (primary key) of the object to remove60      */61     void remove(PK id);62 63     /**64      * Generic method to search for an object.65      * @param searchTerm the search term66      * @param clazz type of class to search for.67      * @return a list of matched objects68      */69     List<T> search(String searchTerm, Class clazz);70     /**71      * Generic method to regenerate full text index of the persistent class T72      */73     void reindex();74 75     /**76      * Generic method to regenerate full text index of all indexed classes77      *78      * @param async79      *            true to perform the reindexing asynchronously80      */81     void reindexAll(boolean async);82 }

通常我们用getAll()访问表中所有的数据，可惜无排序；用search(String searchTerm, Class clazz)来过滤数据，可惜不能自定义条件，只能全字段搜索。

下面是我在开发过程中扩展出来的几个方法，直接附上GenericDaoHibernate中的实现，各层的声明就没再累赘。

1. 自定义排序的getAll

1  public List<T> getAll(String order) {2         session sess = getSession();3         Criteria criteria = sess.createCriteria(persistentClass);4         criteria.addOrder(Order.desc(order));5         System.out.println(criteria);6         return criteria.list();7     }

2. 自定义HQL语句的查询

1  public List<T> selectDataByHql(String hql) {2          Session session = getSession();3         Query query=session.createQuery(hql);4         //执行查询，返回对象集合  5         List<T> allClasses = query.list();6         return allClasses;7     }

3. 根据某一列字段精确匹配的数据，并可排序，比如State=1

1 public List<T> search(String property,Object value,String order) throws SearchException {2         Session sess = getSession();3         Criteria cri= sess.createCriteria(persistentClass); 4         if(StringUtils.isNotBlank(order)){5             cri.addOrder(Order.desc(order));6         }7         cri.add(Restrictions.eq(property,value));8         return cri.list();9     }

4. 自定义条件的查询

1 public List<T> search(Criterion query,String order) throws SearchException {2         Session sess = getSession();3         Criteria cri= sess.createCriteria(persistentClass); 4         if(StringUtils.isNotBlank(order)){5             cri.addOrder(Order.desc(order));6         }7         cri.add(query);8         return cri.list();9     }

有人可能疑问为啥定义了4，还要再定义2呢，只能说编码风格的问题，我喜欢用4的方式，但有人喜欢HQL语句，觉得更加直观。