obtener_perfiles_usuario = " SELECT id_perfil FROM samurai.perfil_sist_usuario WHERE login = ? AND id_sistema = ?"
verificar_login = " SELECT count(*) as cuenta FROM samurai.usuario WHERE login = ?"
+verificar_login2 = " SELECT login FROM samurai.perfil_sist_usuario WHERE login = ? AND id_sistema = ?"
borrar = " DELETE FROM samurai.perfil_sist_usuario WHERE login = ? AND id_sistema = ?"