我正在尝试使用@EmbeddedId,这是我的代码,如下所示,
create table TBL_EMPLOYEE_002(
ID integer generated always as identity (start with 100,increment by 10),
COUNTRY varchar(50),
NAME varchar(50),
constraint PK_EMP_00240 primary key(ID,COUNTRY)
)
嵌入式类如下,
@Embeddable
public class EmployeeIdTwo implements Serializable{
public EmployeeIdTwo(){}
public EmployeeIdTwo(String country){
this.empCountry = country;
}
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="ID")
private Integer employeeId;
@Column(name="COUNTRY",length=50)
private String empCountry;
// implementation of hashCode and equals and only getters
...
}
员工实体如下,
@Entity
@Table(name="TBL_EMPLOYEE_002")
public class EmployeeEntitySix implements Serializable{
public EmployeeEntitySix(){}
public EmployeeEntitySix(EmployeeIdTwo id,String name){
this.id = id;
this.employeeName = name;
}
@EmbeddedId
private EmployeeIdTwo id;
@Column(name="NAME")
private String employeeName;
// getters and setters
}
这是在main方法中编写的代码,
private static void storVal(EntityManager em){
EmployeeEntitySix employee = new EmployeeEntitySix(new EmployeeIdTwo("KENYA"), "Henry Olaanga");
em.persist(employee);
}
但是一旦我运行上面的代码,我就会得到一个异常,如下所示,
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: Attempt to modify an identity column 'ID'.
你能告诉我我错在哪里吗
如果我的 EmbeddedId 类包含自动生成的列,那么应该采用什么方法。
只是知道我使用 hibernate 作为持久性提供程序,使用 JPA 作为持久性 API