In JPA the @SequenceGenerator annotation or sequence-generator>element is used to define a sequence object. The SequenceGenerator defines a sequenceName for the name of the database sequence object, and an allocationSize for the sequence preallocation size or sequence object INCREMENT. Mapping PostgreSQL serial type with Hibernate annotations. Mapped using SERIAL type or sequences in Postgres as long as it gets. JPA and PostgreSQL.
I am using Postgres as database and JPA 2.0 as provider. I had been using @GeneratedValue(strategy = GenerationType.IDENTITY) which generates its own sequence for that column and also executes this query ( or similar ) ALTER TABLE Eurocontrol Ifps User Manual there. 'comment' ALTER COLUMN id SET DEFAULT nextval('comment_id_seq'::regclass); Now I am using @GeneratedValue(strategy = GenerationType. Dual Streaming Is Required For Html Viewing. SEQUENCE, generator = 'GEN_COMMENT') @SequenceGenerator(name = 'GEN_COMMENT', sequenceName = 'SEQ_COMMENT') which also generates it's own sequence but doesn't execute that query. My point is that when I had been using IDENTITY then database could automatically insert the column value from sequence which is helpful when there are other accesses into database except via application. So my question is if there is any way how to force JPA to set default value of that column to sequence without redefinition of @Column(columnDefinition='.'
Thanks a lot.