I'm using CMP entity beans. Particularly to achieve database transparency and to avoid writting all of the db access code.
Do you know how to do it with CMP? -----Original Message----- From: David Ward [mailto:[EMAIL PROTECTED]] Sent: Friday, January 03, 2003 2:58 PM To: [EMAIL PROTECTED] Subject: Re: [JBoss-user] Store large pdfs with JBoss I have been able to put CLOBs and BLOBs into Oracle 9i using JBoss 3.0.4, though admittedly after jumping through several hoops. 1) yes, ejb's aren't supposed to do i/o - I do my work delegated from the servlet level. 2) You have to have autocommit off. For some reason autocommit is on by default in JBoss 3 (wasn't in 2.4) from Connections from DataSources. Please someone tell me how to turn this off in a global config somewhere! 3) You have to first insert a row using an empty lob. For example, insert into my_table (key, data) values ('1', empty_blob()) . You could have used empty_clob() if you were using CLOBS instead of BLOBS. 4) You can then update the BLOB, hower you have to re-select *** using select for update ***. If you don't use select for update, ** it won't work **. For example, select data from my_table where key = '1' for update 5) You then can update the BLOB from the ResultSet. Notice I said oracle.sql.BLOB not java.sql.Blob. I had to use an Oracle-specific type here. I couldn't get it to work any other way, and I spent hours (no, setBinaryStream does not work)... For example, BLOB blob = (BLOB)rs.getBlob(1); BufferedOutputStream bos = new BufferedOutputStream( blob.getBinaryOutputStream() ); // write to the output stream // safely close everything up 6) Don't forget to commit the work you did. This will commit the insert and the data your wrote to your BLOB. 7) I set the autocommit on the Connection back to what it was when I first got it from the DataSource, before I close it (the Connection, which returns it to the pool). Again, I'd like to see autocommit off since I wrap everything in a UserTransaction and it should be committed there instead... Hope this will save you some of the painful time I had to go through if you decide to go this route. David -- Luttrell, Peter escribió:: > Has anyone had experience storing large pdfs with jboss, say ~5mbs each? > > I would like to do it with Oracle and BLOBs, but i've read that there's > problems with the drivers and jboss and it doesn't look like it will be > possible. > > Has anyone done with with any other database? > > Does anyone have ideas on how else to store these files, maybe without a > database? I've always thought the filesystem was pretty much off limits > from the appserver. > > thanks. > .peter > > > > > This transmission contains information solely for intended recipient and > may be privileged, confidential and/or otherwise protect from > disclosure. If you are not the intended recipient, please contact the > sender and delete all copies of this transmission. This message and/or > the materials contained herein are not an offer to sell, or a > solicitation of an offer to buy, any securities or other instruments. > The information has been obtained or derived from sources believed by us > to be reliable, but we do not represent that it is accurate or complete. > Any opinions or estimates contained in this information constitute our > judgment as of this date and are subject to change without notice. Any > information you share with us will be used in the operation of our > business, and we do not request and do not want any material, nonpublic > information. Absent an express prior written agreement, we are not > agreeing to treat any information confidentially and will use any and > all information and reserve the right to publish or disclose any > information you share with us. > -- --------------------- David Ward [EMAIL PROTECTED] http://www.dotech.com ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user This transmission contains information solely for intended recipient and may be privileged, confidential and/or otherwise protect from disclosure. If you are not the intended recipient, please contact the sender and delete all copies of this transmission. 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