Question

基本上我想检查用户是否存在我想用新对象settings更新。我陷入了更新条款。我怎么能这样做？

我想 更新设置中的所有数据 ，而不仅仅是用户字符串。

   Settings settings = new Settings();
    settings.setBaselineImg(baselineImg);
    settings.setGitlabUrl(gitlabUrl);
    settings.setGitlabToken(gitlabToken);
    settings.setProfileProject(profileProject);
    settings.setWebCSRProject(webCSRProject);
    settings.setWebAdminProject(webAdminProject);
    settings.setWebClientProject(webClientProject);
    settings.setDockerHostname(dockerHostname);
    settings.setDockerIP(dockerIP);
    settings.setDockerPort(dockerPort);
    settings.setUser(user);

    //if settings for this user already exist just Update them
    CheckIfSettingsForUserExist(user,settings);
    //else Add to database
    ManageDatabase.AddToDatabase(settings);

}

private static void CheckIfSettingsForUserExist(String user, Settings settings) {
    SessionFactory factory = HibernateUtil.GetSessionFactory();
    Session session = factory.openSession();
    Transaction tx = session.beginTransaction();
    try {
        String hql = "FROM Settings s WHERE s.user = :user";
        Query query = session.createQuery(hql);
        query.setParameter("user",user);
        //If settings for user already exist
        if(query.list().size() > 0)
        {
            //Update
            String hqlUpdate = "UPDATE FROM Settings";
            Query queryUpdate = session.createQuery(hqlUpdate);
            queryUpdate.setParameter("user", user);

        }
        tx.commit();
    } catch (HibernateException e) {
        if (tx!=null) tx.rollback();
        e.printStackTrace();
    }finally {
        session.close();
    }
}

Answer 1

Query query = session.createQuery("update settings set user =  :user");
query.setParameter("user",user);
int result = query.executeUpdate();

我希望查询中会有一个where子句，因为此更新会将所有行更新为新用户（字符串值）。

如何更新数据库行

1 个答案: