Blob .getBytes position should start at 1

From the Javadoc of java.sql.Blob byte[] getBytes(long pos, int length)
throws SQLException;

* @param pos the ordinal position of the first byte in the
* <code>BLOB</code> value to be extracted; the first byte is at
* position 1

pqsql driver assumes the position starts from 0

Patch attached

--
Emmanuel Bernard
http://www.hibernate.org
callto://emmanuelbernard