BLOB - How to make it transactional?

Question

Hi All,
Hope some of you can give me some insight into this problem. Thanks!
I have column in a table w/ oracle's BLOB datatype. It is used to store Java's serialization objects. The problem I am facing is, when a java object is being serialized into the column, the app-server is shut off due to some error or other reasons, the serialized object in the column is corrupted, because it has not been serialized completely. I am wondering if there is a way I can make this serialization into the database transactional. Therefore, it is either all or none, but not half way. I will append the section of the codes that does the serialization. Am I using the correct way? Can you give me some suggestion? Thank you so much in advance!!
- Vince
Here is the section of the codes:
==================================
Statement stat = conn.createStatement();
String sql = "SELECT blob_data FROM blob_table WHERE blob_id=1 FOR UPDATE";
boolean autoCommit = conn.getAutoCommit();
conn.setAutoCommit(false); //error "out of fetch sequence" if this were not called.
ResultSet rs = stat.executeQuery(sql);
if(rs.next()){
BLOB blob = (BLOB)rs.getBlob(1);
OutputStream os = blob.getBinaryOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(os);
oos.writeObject(newData);
oos.flush();
conn.setAutoCommit(autoCommit);
rs.close();
stat.close();

Answer 1

just a thought...
get rid of your final: conn.setAutoCommit(autoCommit);
and do a manual commit. that way your commit won't happen
until your code has completed the stream and expressly
requests a commit, rather than having the database commit
when it perceives the data flow is complete.
good luck,
rich