在用annotation做数据库映射一对多和多对一的时候要注意: @OneToMany(mappedBy = "news_type", cascade = CascadeType.ALL,fetch = FetchType.LAZY) 这里的mappedBy 要对应 @ManyToOne @JoinColumn(name="news_type", nullable=true, insertable = true, updatable = true) private NewsType newsType;的NewsType...
问Spring JPA，@ManyToMany，SQL语法错误ENjpa 的全称是 Java Persistence API , 中文的字面意思就是 ...
In JPA a ManyToMany relationship is defined through the @ManyToMany annotation or the <many-to-many> element. All ManyToMany relationships require a JoinTable. The JoinTable is defined usin...
context.getBootstrapContext().getReflectionManager().toXClass( manyToManyAnn.targetEntity() ) ); collectionBinder.setCascadeStrategy( getCascadeStrategy( manyToManyAnn.cascade(), hibernateCascade, false, false 代码示例来源:origin: hibernate/hibernate-orm private static String getMappedByFromAnnotation(CtFie...
It can be told from the above code that, in aiming of simplify the code,@Dataannotation is used, which led to a hidden trouble for the subsequent development. 2.2 Controller Layer PaperController.java packagecom.example.demo.paper;importorg.springframework.beans.factory.annotation.Autowired;import...
The Tag entity has a unique business key which is marked with the Hibernate-specific @NaturalId annotation. When that’s the case, the unique business key is the best candidate for equality checks.The mappedBy attribute of the posts association in the Tag entity marks that, in this ...
in file [D:\Program Files\Tomcat6.0\webapps\forum\WEB-INF\classes\applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Use of@OneToManyor@ManyToManytargeting an unmappedclass:demo.springsecurity.model.User.posts[demo.springsecurity.model.Post...
错误二 org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: com.hibernate.Bay.group in com.hibernate.SubStation.bays 错误解决方法 在用annotation做数据库映射一对多和多对一的时候要注意: @OneToMany(mappedBy = "news_type", cascade = CascadeType.ALL,fetch = FetchType....
问Spring JPA，@ManyToMany，SQL语法错误ENjpa 的全称是 Java Persistence API , 中文的字面意思就是 ...
packagecom.example.demo.paper;importorg.springframework.beans.factory.annotation.Autowired;importorg.springframework.http.HttpStatus;importorg.springframework.http.ResponseEntity;importorg.springframework.stereotype.Controller;importorg.springframework.web.bind.annotation.*;@Controller@RequestMapping(path="/paper"...