Saving sessions in the database...

Question

Hi there, I'm trying to save a session object ( not a J2EE session but a custom one ) in an Oracle database. I save the session in a table with a BLOB column and some other varchar columns... Whenever I want to write a blob, the application freezes... When I want to read a file, it's ok... Anyone knows of this problem? Here is the code of my write method:
  private void writeSession(CapSession pSession) throws Exception
    static final String writeObjSQL      = "BEGIN " +
                                         "  INSERT INTO intranet_sessions(session_id, session_last_access, session_timeout, session_value) " +
                                         "  VALUES (?, ?, ?, empty_blob()) " +
                                         "  RETURN session_value INTO ?; " +
                                         "END;";
    CallableStatement stmt = conn.prepareCall(writeObjSQL);
    stmt.setString(1, pSession.getSessionId() + pSession.getPassword());
    stmt.setLong(2, pSession.getLastAccess());
    stmt.setLong(3, pSession.getTimeout());
    stmt.registerOutParameter(4, java.sql.Types.BLOB);
    stmt.executeUpdate();
    BLOB blob = (BLOB) stmt.getBlob(4);
    OutputStream os = blob.getBinaryOutputStream();
    ObjectOutputStream oop = new ObjectOutputStream(os);
    oop.writeObject(pSession);
    oop.flush();
    oop.close();
    os.close();
    stmt.close();
    conn.commit();
}Thanks!

Answer 1

Try this
conn.setAutoCommit(false);
PreparedStatement pstmtIns = conn.prepareStatement
               ("INSERT INTO intranet_sessions" +
                    "(session_id, session_last_access, session_timeout, session_value) " +
" VALUES (?, ?, ?, empty_blob()) ");
pstmt.setString(1, pSession.getSessionId() + pSession.getPassword());
pstmt.setLong(2, pSession.getLastAccess());
pstmt.setLong(3, pSession.getTimeout());
pstmt.execute();
PreparedStatement pstmtSel = conn.prepareStatement
               ("select session_value from intranet_sessions where session_id = ? for update");
pstmtSel.setString(1, pSession.getSessionId() + pSession.getPassword());
ResultSet rs = pstmtSel.executeQuery();
while(rs.next())
     BLOB blob = (BLOB) rs.getBlob(1);
     OutputStream os = blob.getBinaryOutputStream();
     ObjectOutputStream oop = new ObjectOutputStream(os);
     ObjectOutputStream oop = new ObjectOutputStream(os);
     oop.writeObject(pSession);
oop.flush();
}