我有两个实体
@Entity
public class Video {
@Id
@GeneratedValue
private Integer id;
@Size(min = 5,max = 50, message = "Valid title is 5-50 chars")
private String title;
@ManyToMany(cascade = {CascadeType.MERGE})
@JoinTable(name = "vids_customers",
joinColumns = @JoinColumn(name = "vids_id"),
inverseJoinColumns = @JoinColumn(name = "customers_id"))
private List<Customer> customers;
// getters and setters goes here
}
和
@Entity
public class Customer {
@Id
@GeneratedValue
private Integer id;
@Size(min = 5,max = 15, message = "Valid name is 5-15 chars")
private String name;
@ManyToMany(mappedBy = "customers", cascade = {CascadeType.MERGE})
private List<Videos> videos;
// getters and setters goes here
}
我创建了一条记录
视频标题:为冠军站起来 客户1-John,2-James
我想更新视频记录,并希望添加或删除客户
视频标题:站起来...... 客户1-John,2-James,3-Ria
所以我有一个查询将视频更新为
@Modifying
@Query("UPDATE Video v SET v.title = :title WHERE v.id = :id")
@Transactional
void update(@Param("id") Integer id, @Param("title") String title);
上面的查询更新了视频记录,但没有和/或删除了客户,我想通过在上面的查询中进行更改来完成这项工作
@Modifying
@Query("UPDATE Video v SET v.title = :title JOIN v.customers c WHERE v.id = :id")
@Transactional
void update(@Param("id") Integer id, @Param("title") String title);
我得到了
ERROR: org.hibernate.hql.internal.ast.ErrorCounter - line 1:199: unexpected token: JOIN
ERROR: org.hibernate.hql.internal.ast.ErrorCounter - line 1:199: unexpected token: JOIN
line 1:199: unexpected token: JOIN
at org.hibernate.hql.internal.antlr.HqlBaseParser.updateStatement(HqlBaseParser.java:254)
at org.hibernate.hql.internal.antlr.HqlBaseParser.statement(HqlBaseParser.java:162)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:295)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:203)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:158)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:126)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:88)
at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:190)
at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:301)
at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:236)
at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1800)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:328)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:344)
at com.sun.proxy.$Proxy48.createQuery(Unknown Source)
如何编写查询以便我可以更新视频记录并希望添加或删除客户。
答案 0 :(得分:1)
您无法使用HQL更新两个或更多实体。首先通过Hibernate会话获取Video对象并添加/删除客户
Video video = (Video)session.get(Video.class, id);
video.getCustomers().clear();//removes all the existing customers
Customer customer1 = new Customer();
customer1.getVideos().add(video)//adding video to the customer
video.getCustomers().add(customer1);
session.update(video)// this will insert row into video table, customers table and join table.