#446 PostgreSQLOidDataType.setSqlValue casts PGConnection instead of unwrapping

[Krzysztof Molski]

This is similar to issue #436, where PostgreSQLOidDataType.getSqlValue would cast connections to PGConnection directly.

This issue was not fixed in the setSqlValue method, which results in ClassCastExceptions when inserting large objects with a wrapped/proxied connection (e.g. HikariCP).
Example test: https://github.com/kmolski/dbunit-issue-446/blob/main/src/test/java/pl/kmolski/DbunitProxyReproTest.java

The issue could be solved like bug #436, by changing the cast:

LargeObjectManager lobj = ((org.postgresql.PGConnection)
    statement.getConnection()).getLargeObjectAPI();

to unwrap:

PGConnection pgConnection = connection.unwrap(PGConnection.class);
LargeObjectManager lobj = pgConnection.getLargeObjectAPI();

[Jeff Jensen]

Thank you for reporting with a solution; even better you made a test - very helpful! Thank you very much. Will review and apply this as soon as I can.

[Krzysztof Molski]

This ticket can be closed, it was fixed by https://sourceforge.net/p/dbunit/code.git/merge-requests/58/