请教hibernate的blob和clob问题。

Question

  public void addGraph(Graph graph, String graph_body) throws
      HibernateException, SQLException {
    beginTransaction();
    graph.setGraph_content(Hibernate.createClob(" "));
    session.save(graph);
    session.flush();
    session.refresh(graph, LockMode.UPGRADE);
    oracle.sql.CLOB clobs = (oracle.sql.CLOB) graph.getGraph_content();
    java.io.Writer pw = clobs.getCharacterOutputStream();
    try {
      pw.write(graph_body);
      pw.flush();
      pw.close();
    }
    catch (IOException e) {
      throw new HibernateException(e);
    }
    endTransaction();
  }

Answer 1

public void updateGraph(Graph graph, String graph_body) throws
      HibernateException, SQLException {
    try {
      beginTransaction();
      graph.setGraph_content(Hibernate.createClob(" "));
      session.update(graph);
      session.flush();
      if (null != graph_body) {
        session.refresh(graph, LockMode.UPGRADE);
        oracle.sql.CLOB clobs = (oracle.sql.CLOB) graph.getGraph_content();
        java.io.Writer pw = clobs.getCharacterOutputStream();
        pw.write(graph_body);
        pw.flush();
        pw.close();
      }
      endTransaction();
    }
    catch (IOException e) {
      throw new HibernateException(e);
    }
  }