Serial Postgresql Hibernate

PostgreSQL supports an auto increment type named 'SERIAL'. Serial type is a 'virtual' type that will automatically: • Create a sequence named 'tablename_colname_seq'. • Set the default value of this column to the next value of the sequence.

(using function 'nextval('tablename_colname_seq')') • Add a 'NOT NULL' constraint to this column. • Set the sequence as 'owned by' the table. To insert the next value of the sequence into the serial column, exclude the column from the list of columns in the INSERT statement or use the DEFAULT key word. If the table or the column is dropped, the sequence is dropped too. To retreive the value of the last insert, PostgreSQL 8.1 and above defined the fuction 'lastval()' that returns the value of the last sequence that 'nextval()' was used on in the current session. A Call to 'lastval()' if 'nextval()' has not yet been called in the current session throw an exception. With the functionalities listed above we can implement the support for identity column in PostgreSQL. Winchester 94ae serial number date.

If i'm right, the only drawback against real identity column is that, if we insert 'manualy' an id in the column, a constraint error will be raised when the sequence will try to insert that value. I've tested it with PostgreSQL 8.1.6 and 8.2.3 unsing Npgsql 1.0 and it works well with all the adventage of identity columns, that is, insert a row and get its id back in a single sql command. Note that it is also possible to made this works on PostgreSQL 8.0, but since the function 'lastval()' isn't available, we have to retrieve the value of the last insert row with something like: 'select currval(' + tableName + '_' + identityColumn + '_seq')'. And this doesn't works with shema. In attachement is the enhanced version of the PostgreSQL 8.1 Dialect.

PostgreSQL supports a set proprietary data types which Hibernate doesn’t map by default. Popular examples for that are the JSON and JSONB data types which allow you to persist and query JSON documents in a PostgreSQL database. If you want to use these types with Hibernate, you need to define the mapping yourself.

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