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Re: [eclipselink-users] Postgresql and UUID eclipselink 2.4.0
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The @UuidGenerator is for generating a UUID in Java and storing it to the
database as a String (varchar) or byte[] (varbinary).
To use the custom Postgres UUID type you will need to write your own
Converter (@Convert, @Converter) to handle the conversion of whatever type
Postgres returns from JDBC to/from the Java type you want to use.
See,
http://www.eclipse.org/eclipselink/documentation/2.4/jpa/extensions/a_converter.htm#CHDEHJEB
Edward Mann-3 wrote:
>
> I have been trying to figure out how to get the native uuid type in
> postgresql and eclipselink to work together. I have a simple
> table for
> testing:
>
> CREATE TABLE elink
> (
> el_id uuid NOT NULL DEFAULT uuid_generate_v4(), -- elink id
> el_name character varying(255), -- elink name
> CONSTRAINT el_pkey PRIMARY KEY (el_id )
> DEFERRABLE INITIALLY IMMEDIATE
> )
> WITH (
> OIDS=FALSE
> );
> ALTER TABLE elink
> OWNER TO emann;
> COMMENT ON COLUMN elink.el_id IS 'elink id';
> COMMENT ON COLUMN elink.el_name IS 'elink name';
>
>
> And the annotation on the field for id is:
>
> @Id
> @Column(name="el_id")
> @UuidGenerator(name="uuid")
> @GeneratedValue(generator="uuid")
> private UUID elId;
>
> I have also tried the custom UUIDSequence mentioned on the
> website,
> however that did not work either. I get the following error
> (this is the
> UUIDSequence native to 2.4.0):
>
> Exception [EclipseLink-3002] (Eclipse Persistence Services -
> 2.4.0.v20120608-r11652):
> org.eclipse.persistence.exceptions.ConversionException
> Exception Description: The object
> [66FB2FFB-2735-4A8C-AFDE-19246C78CC16], of class [class
> java.lang.String], from mapping
>
> [org.eclipse.persistence.mappings.DirectToFieldMapping[elId-->ELINK.el_id]]
> with descriptor [RelationalDescriptor(model.Elink -->
> [DatabaseTable(ELINK)])], could not be converted to [class [B].
>
>
> So i am really curious about what is the proper way to get this
> to work
> using uuid type in postgresql.
> Any help is welcome, thanks in advance.
>
> _______________________________________________
> eclipselink-users mailing list
> eclipselink-users@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>
>
-----
http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
http://www.eclipse.org/eclipselink/
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