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[英]What should I prefer using JPA - pure SQL or JPQL and how to create/delete table using JPQL and Entity
[英]How should I refer to inner enums (defined within an entity) from a JPQL query using Hibernate?
我有一个实体类如下:
package stuff;
@Entity
class Thing {
@Id
@GeneratedValue
private Long id;
@Basic
@Enumerated
private State state;
public enum State {
AWESOME,
LAME
}
}
如何使用JPQL和Hibernate选择状态为AWESOME的所有东西?
select t from Thing t where t.state=stuff.Thing.State.AWESOME
......给出错误......
org.hibernate.hql.internal.ast.QuerySyntaxException: Invalid path: 'stuff.Thing.State.AWESOME'
使用以下习语:
select t from Thing t where t.state=stuff.Thing$State.AWESOME
Type$InnerType
是Java的内部类型的命名约定。
当您尝试使用点表示法时,Hibernate会假设您正在尝试访问嵌套属性,在这种情况下(正确)失败。
select t from Thing t where t.state='AWESOME'
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