我正在使用MVC应用程序中的c#代码来验证用户并查找特定用户所属的用户组列表,并使用以下代码 { using (PrincipalContext ctx = new PrincipalContext(ContextType.Domain, "mydomain.com",model.Email,model.Password))
FROM usergroups, frontend_users WHERE usergroups.uid = SUBSTRING_INDEX(frontend_users.usergroup, ',', 1)),
(SELECT usergroups.title FROM usergroups, frontend_users WHERE usergroups.uid = SUBSTRING_INDEXFROM usergroups, front