How to add Unique Constraint on Entity class for Two different different combination of columns

Question

要为2个diff diff列的组合添加唯一约束

Answer 1

There is no Hibernate annotation that checks uniqueness before insert/update. But there is annotation which will generate such a constraint to the database if automatic database creation is used:

Try this one: When hibernate create a table in DB create unique constraint combination of these two columns.

@Table(
    name="Table_Name", 
    uniqueConstraints=
        @UniqueConstraint(columnNames={"Column1", "Column2"})
)