Java 如何更新数据库行
基本上我想检查用户是否存在,我想用新的对象设置更新。我被更新条款卡住了。我该怎么做 我想更新设置中的所有数据,而不仅仅是用户字符串Java 如何更新数据库行,java,hibernate,Java,Hibernate,基本上我想检查用户是否存在,我想用新的对象设置更新。我被更新条款卡住了。我该怎么做 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.setProfile
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();
}
}
我希望查询中会有where子句,因为此更新会将所有行更新为新的用户字符串值。我不想只更新用户。我想用有很多参数的对象设置进行更新,但是你正在函数中传递字符串user,不是吗?现在请检查我的代码。我想用新数据更新所有数据。类似于使用新设置更新设置,其中user=:usersettings.setUseruser;这里是用户字符串?然后将所有详细信息更新为更新设置col_1=col_1\u new_值,col_2=col2\u new_值。。。。。。。其中user=:user
Query query = session.createQuery("update settings set user = :user");
query.setParameter("user",user);
int result = query.executeUpdate();