Does Eclipse Link work together with Vertica

Question

i'm currently testing vertica. Since vertica has a jdbc driver it should be possible to get it working.

Is there a simple way to get Eclipse link to support vertica? Are there alternative orm framework (like hibernate) that support it?

Answer 1

According to the Vertica Support Hibernate queries works with the org.hibernate.dialect.PostgreSQLDialect while this is true there are still some problems (exspecially with hbm2ddl) that can only be fixed with a custom dialect.

Among those are:

• data type mapping: there are no 4 byte datatypes, so the default java int mapping to int4 doesn't work. same goes for several other types.
• no indexes: for obvious reasons vertica doesn't know create index, if your model contains @index annotations, remove them

not sure how far postgres is from vertica but with my own custom dialect that inherits the postgres dialect everything works so far.

Answer 2

As long as you have a compliant JDBC driver EclipseLink should work with Vertica.

Some features such as DDL generation, may require a custom DatabasePlatform class, which you could create if required. Most features should work with the generic DatabasePlatform.

Are you encountering any specific issues?

Answer 3

We recently tried to get Hibernate working with vertica unsuccessfully. One of the problems was an inexistent dialect for that combination. After consulting a Vertica consultant the answer was that there is no plans to provide this sort of support as ORMs like hibernate and a DB like Vertica provide different approaches for data storage.