Load JAR from BLOB column?

Question

I have a JAR file that load and works find when I use the loadjava utility, but my software is now being deployed to a server that I don't have remote access to and can't connect remotely to the Oracle database. I need to push out updated JAR files periodically and would like to automate the updates without requiring help from their DBA.
Is it possible to load my JAR into a BLOB column in the database and then have it loaded from that? In my testing it appears that I can do that for a single class, but I'd like to do the entire JAR. I've tried CREATE JAVA ... USING BLOB, but that appears to be expecting a character stream (java source).
My software is on a separate server from the database, so I don't think I can use a BFILE???
We're using Oracle 10g.
Thanks!

Answer 1

Hi
Sure you can do that :)
I have done a CMS Application Archive importer into DBPrism CMS.
Look at the code (importDir function):
http://dbprism.cvs.sourceforge.net/viewvc/dbprism/cms-2.1/src/com/prism/cms/core/Util.java?revision=1.10&view=markup
First you has to iterate on each entry of the JAR using ZipInputStream class, then for each entry you can create a temporary BLOB to process each "create java class using .." SQL operations.
Here a code snipped:
695 BLOB newContent =
696 BLOB.createTemporary(conn, true, BLOB
697 .DURATION_SESSION);
698 OutputStream ow = newContent.setBinaryStream(1L);
699 while ((size = jin.read(buff, 0, buff.length)) > 0)
700 ow.write(buff, 0, size);
701 ow.flush();
702 ow.close();
703 ow = null;
704 cs.setBLOB(1, newContent);
705 cs.setString(2,(isResource) ? "java resource" : "java source");
706 cs.setString(3, classOrResourceName);
707 cs.registerOutParameter(4,Types.VARCHAR);
708 try {
709 cs.executeUpdate();
710 String loadedClass = cs.getString(4);
711 if (!isResource)
712 listOfLoadedClasses.put(loadedClass,classOrResourceName);
713 log.debug(".importDir - OK loading: "+loadedClass);
714 } catch (SQLException s) {
715 log.warn(".importDir - Error loading: "+classOrResourceName,s);
716 } finally {
717 newContent.freeTemporary();
718 }
cs is:
674 cs =
675 (OracleCallableStatement)conn.prepareCall("{ call begin\n" +
676 " update create$java$lob$table set LOB = ?, loadtime=sysdate where name = 'LOADJAVA/LOB/KEY';\n" +
677 " execute immediate 'create or replace '||?||' named \"'||?||'\" using ''LOADJAVA/LOB/KEY''';\n" +
678 " ? := \"NameFromLastDDL\"(0);\n" +
679 " end }");
Hope this help, Marcelo.