带注释的休眠字符串主键

Question

I am trying to create a Privilege class with Annotations whose Primary Key is a String. I will assign them manually while inserting. Therefore no need for hibernate to generate a value for it. I'm trying to do something like that:

@Id
@GeneratedValue(generator = "assigned")
@Column(name = "ROLE_NAME", nullable = false)
private String roleName;

But it throws that exception:

Caused by: org.hibernate.AnnotationException: Unknown Id.generator: assigned

How can I configure a String primary key with annotations?

Answer 1

Since the roleName is not auto-generated, you should simply not annotate it with @GeneratedValue :

@Id
@Column(name = "ROLE_NAME", nullable = false)
private String roleName;

Answer 2

Just use the @Id annotation which lets you define which property is the identifier of your entity. You don't need to use the @GeneratedValue annotation because I don't think you want hibernate to generate this property for you.

Even in the XML configuration based approach its an optional tag and can be skipped.

Answer 3

@Id
@Column(name = "USER_ID",unique=true,columnDefinition="VARCHAR(64)")
private String userId;

This worked for me by representing the columnDefinition type with column annotation during the save or update.

Answer 4

you can enter this way, suppose position is primary key of that Salary entity,

@Id
@Column (name = "POSITION", nullable = false)
private String position;

then, it will work