Java tutorial
/** * Copyright (c) 2005-2011 springside.org.cn * * Licensed under the Apache License, Version 2.0 (the "License"); * * $Id: SimpleHibernateDao.java 1594 2011-05-11 14:22:29Z calvinxiu $ */ package com.xdtech.core.orm.hibernate; import java.io.Serializable; import java.util.Collection; import java.util.List; import java.util.Map; import org.hibernate.Criteria; import org.hibernate.Hibernate; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.criterion.CriteriaSpecification; import org.hibernate.criterion.Criterion; import org.hibernate.criterion.Order; import org.hibernate.criterion.Restrictions; import org.hibernate.metadata.ClassMetadata; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import com.xdtech.core.orm.utils.AssertUtils; import com.xdtech.core.orm.utils.ReflectionUtils; /** * HibernateAPIDAO. * * Spring2.5Petlinc, HibernateTemplate, HibernateAPI. * * @param <T> DAO * @param <ID> * * @author calvin */ public class SimpleHibernateDao<T, ID extends Serializable> { protected Logger logger = LoggerFactory.getLogger(getClass()); protected SessionFactory sessionFactory; protected Class<T> entityClass; /** * Class. * eg. * public class UserDao extends SimpleHibernateDao<User, Long> */ public SimpleHibernateDao() { this.entityClass = ReflectionUtils.getSuperClassGenricType(getClass()); } public SimpleHibernateDao(Class<T> entityClass) { this.entityClass = entityClass; } /** * sessionFactory. */ public SessionFactory getSessionFactory() { return sessionFactory; } /** * @AutowiredSessionFactory, SesionFactory. */ @Autowired public void setSessionFactory(final SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; } /** * Session. */ public Session getSession() { return sessionFactory.getCurrentSession(); } /** * . */ public void save(final T entity) { AssertUtils.notNull(entity, "entity"); getSession().saveOrUpdate(entity); logger.debug("save entity: {}", entity); } public void saveAll(final List<T> entities) { AssertUtils.notNull(entities, "entity"); for (T entity : entities) { save(entity); } logger.debug("save entities: {}", entities); } /** * . * * @param entity sessionidtransient. */ public void delete(final T entity) { AssertUtils.notNull(entity, "entity"); getSession().delete(entity); logger.debug("delete entity: {}", entity); } public void deleteAll(final List<T> entities) { AssertUtils.notNull(entities, "entity"); for (T entity : entities) { delete(entity); } logger.debug("delete entities: {}", entities); } /** * id. */ public void delete(final ID id) { AssertUtils.notNull(id, "id"); delete(get(id)); logger.debug("delete entity {},id is {}", entityClass.getSimpleName(), id); } /** * id. */ public T get(final ID id) { AssertUtils.notNull(id, "id"); return (T) getSession().load(entityClass, id); } /** * id. */ public List<T> get(final Collection<ID> ids) { return find(Restrictions.in(getIdName(), ids)); } /** * . */ public List<T> getAll() { return find(); } /** * , . */ public List<T> getAll(String orderByProperty, boolean isAsc) { Criteria c = createCriteria(); if (isAsc) { c.addOrder(Order.asc(orderByProperty)); } else { c.addOrder(Order.desc(orderByProperty)); } return c.list(); } /** * , . */ public List<T> findBy(final String propertyName, final Object value) { AssertUtils.hasText(propertyName, "propertyName"); Criterion criterion = Restrictions.eq(propertyName, value); return find(criterion); } /** * , . */ public T findUniqueBy(final String propertyName, final Object value) { AssertUtils.hasText(propertyName, "propertyName"); Criterion criterion = Restrictions.eq(propertyName, value); return (T) createCriteria(criterion).uniqueResult(); } /** * HQL. * * @param values ,. */ public <X> List<X> findByHql(final String hql, final Object... values) { return createHqlQuery(hql, values).list(); } public <X> List<X> findByClass(Class<?> cls) { return createHqlQuery("from " + cls.getSimpleName()).list(); } /** * HQL. * * @param values ,. */ public <X> List<X> find(final String hql, final Map<String, ?> values) { return createQuery(hql, values).list(); } /** * HQL. * * @param values ,. */ public <X> X findUnique(final String hql, final Object... values) { return (X) createHqlQuery(hql, values).uniqueResult(); } /** * HQL. * * @param values ,. */ public <X> X findUnique(final String hql, final Map<String, ?> values) { return (X) createQuery(hql, values).uniqueResult(); } /** * HQL/. * * @param values ,. * @return . */ public int batchExecute(final String hql, final Object... values) { return createHqlQuery(hql, values).executeUpdate(); } /** * HQL/. * * @param values ,. * @return . */ public int batchExecute(final String hql, final Map<String, ?> values) { return createQuery(hql, values).executeUpdate(); } /** * HQLQuery. * find(). * * @param values ,. */ public Query createHqlQuery(final String queryString, final Object... values) { AssertUtils.hasText(queryString, "queryString"); Query query = getSession().createQuery(queryString); if (values != null) { for (int i = 0; i < values.length; i++) { query.setParameter(i, values[i]); } } return query; } /** * HQLQuery. * find(). * * @param values ,. */ public Query createQuery(final String queryString, final Map<String, ?> values) { AssertUtils.hasText(queryString, "queryString"); Query query = getSession().createQuery(queryString); if (values != null) { query.setProperties(values); } return query; } /** * SQLQuery. * find(). * @param sqlQueryString sql * * @param values ,. */ public Query createSQLQuery(final String sqlQueryString, final Object... values) { Query query = getSession().createSQLQuery(sqlQueryString); if (values != null) { for (int i = 0; i < values.length; i++) { query.setParameter(i, values[i]); } } return query; } /** * Criteria. * * @param criterions Criterion. */ public List<T> find(final Criterion... criterions) { return createCriteria(criterions).list(); } /** * Criteria. * * @param criterions Criterion. */ public T findUnique(final Criterion... criterions) { return (T) createCriteria(criterions).uniqueResult(); } /** * CriterionCriteria. * find(). * * @param criterions Criterion. */ public Criteria createCriteria(final Criterion... criterions) { Criteria criteria = getSession().createCriteria(entityClass); for (Criterion c : criterions) { criteria.add(c); } return criteria; } /** * . * load()Proxy, View. * entity, entity,. * ,: * Hibernate.initialize(user.getRoles())User. * Hibernate.initialize(user.getDescription())UserDescription. */ public void initProxyObject(Object proxy) { Hibernate.initialize(proxy); } /** * FlushSession. */ public void flush() { getSession().flush(); } /** * Querydistinct transformer. * HQL, distinct. */ public Query distinct(Query query) { query.setResultTransformer(CriteriaSpecification.DISTINCT_ROOT_ENTITY); return query; } /** * Criteriadistinct transformer. * HQL, distinct. */ public Criteria distinct(Criteria criteria) { criteria.setResultTransformer(CriteriaSpecification.DISTINCT_ROOT_ENTITY); return criteria; } /** * . */ public String getIdName() { ClassMetadata meta = getSessionFactory().getClassMetadata(entityClass); return meta.getIdentifierPropertyName(); } /** * . * * ,(value)(orgValue). */ public boolean isPropertyUnique(final String propertyName, final Object newValue, final Object oldValue) { if (newValue == null || newValue.equals(oldValue)) { return true; } Object object = findUniqueBy(propertyName, newValue); return (object == null); } }