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J2EE Search的增删查改及检索初步实现 |
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logger.info("finding Book instance with id: " + id);
try {
Book instance = getJpaTemplate().find(Book.class, id);
return instance;
} catch (RuntimeException re) {
logger.error("find failed", re);
throw re;
}
}
@SuppressWarnings("unchecked")
public List<Book> findByProperty(String propertyName, final Object value) {
logger.info("finding Book instance with property: " + propertyName
+ ", value: " + value);
try {
final String queryString = "select model from Book model where model."
+ propertyName + "= :propertyValue";
return getJpaTemplate().executeFind(new JpaCallback() {
public Object doInJpa(EntityManager em)
throws PersistenceException {
Query query = em.createQuery(queryString);
query.setParameter("propertyValue", value);
return query.getResultList();
}
});
} catch (RuntimeException re) {
logger.error("find by property name failed", re);
throw re;
}
}
public List<Book> findByName(Object name) {
return findByProperty(NAME, name);
}
@SuppressWarnings("unchecked")
public List<Book> findAll() {
logger.info("finding all Book instances");
try {
final String queryString = "select model from Book model";
return getJpaTemplate().executeFind(new JpaCallback() { 数据挖掘实验室
public Object doInJpa(EntityManager em)
throws PersistenceException {
Query query = em.createQuery(queryString);
return query.getResultList();
}
});
} catch (RuntimeException re) {
logger.error("find all failed", re);
throw re;
}
}
public static BookDAO getFromApplicationContext(ApplicationContext ctx) {
return (BookDAO) ctx.getBean("BookDAO");
}
private void makeIndex(EntityManager em){
FullTextEntityManager fullTextEntityManager = Search.createFullTextEntityManager(em);
List<Book> books = em.createQuery("select book from Book as book").getResultList();
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FilteredTermEnum (Lucene 2.2.0 API)
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