防止Dozer触发Hibernate延迟加载
我正在使用Spring事务，因此当POJO到DTO转换发生时，事务仍处于活动状态。
我想阻止Dozer触发延迟加载，以便隐藏的sql查询永远不会发生：所有提取都必须通过HQL显式完成（以获得对性能的最佳控制）。
这是一个好习惯（我无法在任何地方找到它）？
怎么安全地做？
我在DTO转换之前试过这个：
PlatformTransactionManager tm = (PlatformTransactionManager) SingletonFactoryProvider.getSingletonFactory().getSingleton("transactionManager");
tm.commit(tm.getTransaction(new DefaultTransactionDefinition()));
SessionFactory sf = (SessionFactory) SingletonFactoryProvider.getSingletonFactory().getSingleton("sessionFactory");
sf.getCurrentSession().clear();
sf.getCurrentSession().close();
没有找到相关结果
已邀请:
6 个回复
壤欠攻混
public class MyCustomFieldMapper implements CustomFieldMapper { public boolean mapField(Object source, Object destination, Object sourceFieldValue, ClassMap classMap, FieldMap fieldMapping) { // Check if field is a Hibernate collection proxy if (!(sourceFieldValue instanceof AbstractPersistentCollection)) { // Allow dozer to map as normal return false; } // Check if field is already initialized if (((PersistentSet) sourceFieldValue).wasInitialized()) { // Allow dozer to map as normal return false; } // Set destination to null, and tell dozer that the field is mapped destination = null; return true; } }<bean id="dozerMapper" class="org.dozer.DozerBeanMapper" lazy-init="false"> <property name="mappingFiles"> ... </property> <property name="customFieldMapper" ref="dozerCustomFieldMapper" /> </bean> <bean id="dozerCustomFieldMapper" class="my.project.MyCustomFieldMapper" />咖哀烈
public class LazyLoadSensitiveMapper implements CustomFieldMapper { public boolean mapField(Object source, Object destination, Object sourceFieldValue, ClassMap classMap, FieldMap fieldMapping) { //if field is initialized, Dozer will continue mapping // Check if field is derived from Persistent Collection if (!(sourceFieldValue instanceof AbstractPersistentCollection)) { // Allow dozer to map as normal return false; } // Check if field is already initialized if (((AbstractPersistentCollection) sourceFieldValue).wasInitialized()) { // Allow dozer to map as normal return false; } return true; }傻零凰死授
public class HibernateInitializedFieldMapper implements CustomFieldMapper { public boolean mapField(Object source, Object destination, Object sourceFieldValue, ClassMap classMap, FieldMap fieldMapping) { //if field is initialized, Dozer will continue mapping return !Hibernate.isInitialized(sourceFieldValue)); } }替秀宝
一个懒惰加载集合的调用，就像你自己访问这些属性一样。 任何让Dozer知道你的bean中的Hibernate代理的技巧，反之亦然，IMO会打破你的应用层。 如果您不希望在意外时间触发任何“隐藏的SQL查询”，只需禁用延迟加载。钾涎净介
靛取糕奖穿
public Set<childObject> getChild() { if(Hibernate.isInitialized(child){ return childObject; }else return null; }