@Column(unique=true) does not seem to work

Question

Even though I set the attribute to be @Column(unique=true), I still insert a duplicate entry.

@Entity
public class Customer {

    @Id
    @Ge         


        

Answer 1

Try specifying the unique constraint at the class level using

@Table(uniqueConstraints={@UniqueConstraint(columnNames={"name"})})
public class Customer {
...
    private String name;
}

@Column(unique=true) doesn't work for me but when I used @UniqueConstraint at the class level, the column in the database (MySql) was appropriately set as unique.

I hope this helps someone else who may face this same issue in the future

Answer 2

Make sure to delete the tables created by hibernate in your database. And then re-run your hibernate application again.