Bug 337467

Description Michal Piotrowski 2011-02-17 12:01:41 EST

Build Identifier: 2.1.2.v20101206-r8635

There are 2 binary types in PotgreSQL: bytea and Blob. bytea is correctly supported in EclipseLink JPA, but Blob is not correctly implemented.

Blobs in PostgreSQL are linked into table columns as blob's OID number, so column type is OID. PostgreSQL driver returns for this column:
TYPE_NAME="oid"
DATA_TYPE=java.sql.Types.BIGINT
But it is possible to obtain Blob using ResultSet.getBlob() method.

EclipseLink thinks that blob column should be a java.lang.Long and can't read the blob. The result is that correctly annotated by @Lob PostgreSQL's blob columns can't be read.

I think that EclipseLink should read oid columns as Blob if they are annotated as @Lob.

I would like to add, that when I tested Hibernate JPA some time ago, Hibernate expected serializable fields annotated with @Lob to be oids in PostgreSQL, and serializable fields without @Lob annotation to be bytea (java.sql.Types.BINARY). I think that this approach to PostgreSQL binary types should be treated as the correct one.

Reproducible: Always

Steps to Reproduce:
1. Create table with BLOB's in PostgreSQL: "create table test (id serial primary key, data oid);"
2. Import some blob using psql: "\lo_import a_file_name"
3. Insert into table blob oid returned by \lo_import, eg: "insert into test values (1, 36253);"
4. Create @Entity with @Lob field and try to read the database row.