Question

我想定义几个命名查询，如：

@Entity
@Table(name = "TableA")
@NamedQuery(query = "SELECT i FROM TableA i WHERE i.Id = :Id", name = "findAById")
@NamedQuery(query = "SELECT i FROM TableA i WHERE i.name = :name", name = "findAByName")
public class TableA  
{   
    @Id
    @GeneratedValue(strategy = GenerationType.TABLE)
    private Long id;

    @Column(name="Name")
    String name = "";

\\... more code


}

但是这样做，我在eclipse中收到以下错误信息：

重复注释非可重复类型@NamedQuery。只要标记为@Repeatable的注释类型可以多次使用一次目标

并在汇编时：

java.lang.annotation.AnnotationFormatError：复制注释 class：interface javax.persistence.NamedQuery： @ javax.persistence.NamedQuery（lockMode = NONE，hints = []，query = SELECT i FROM TableA i WHERE i.name =：name， name = findAByName）at sun.reflect.annotation.AnnotationParser.parseAnnotations2（未知源）

对我来说，每个类只有一个名为Query的限制没有多大意义。这是一个错误还是一个功能？是否有解决方法来为每个类定义更多命名查询？

Answer 1

嘿，你需要定义如下：

@NamedQueries({
     @NamedQuery(query = "SELECT i FROM TableA i WHERE i.Id = :Id", name = "findAById"),
     @NamedQuery(query = "SELECT i FROM TableA i WHERE i.name = :name", name = "findAByName")
})

Answer 2

使用以下内容：-

@NamedQueries( 
  value={
     @NamedQuery(name = "findAById", query = "SELECT i FROM TableA i WHERE i.Id = :Id"),
     @NamedQuery(name = "findAByName", query = "SELECT i FROM TableA i WHERE i.name = :name")
  }
)

不可重复的@NamedQuery

2 个答案: