Java – @ size, @ length and @ column (length = value)

What is the difference between the validation check of the following three fields?

@Entity
public class MyEntity {

    @Column(name = "MY_FIELD_1",length=13)
    private String myField1;
    @Column(name = "MY_FIELD_2")
    @Size(min = 13,max = 13)
    private String myField2;
    @Column(name = "MY_FIELD_3")
    @Length(min = 13,max = 13)
    private String myField3;

    // getter & setter

}

I saw the first thing related to DDL The second is for bean validation The third is hibernate authentication

Is that right? What I still don't understand is: when do I need to use which one? When is one of these comments triggered?

Edit: think about the following: consider developing an entity with a string type of length 13 Which of the above methods would you choose? Even better: what questions do you have to ask yourself to find out which one suits you?

Solution

>@ column is a JPA annotation, and the length attribute is used by the schema generation tool to set the associated SQL column length

SO 2 And 3 Bean validation should be used to verify the length of a string I will choose 2 Because it is universal