Cláusulas CONNECT BY e START WITH no Oracle SQL
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12-12-2019 - |
Pergunta
Quero dados hierárquicos para os dados de teste fornecidos abaixo.Para o usuário 'jones' deve buscar os registros abaixo.Estou tendo problemas com as cláusulas CONNECT BY e START WITH.Também acho que há algum problema de JOIN entre as tabelas menu_items AND role_menu_items.
para o usuário e suas funções correspondentes, preciso encontrar os dados abaixo
select mi.id, mi.NAME,mi.MEN_ID,mi.ICON,mi.ACTION--,r.NAME
from
menu_items mi,
role_menu_items rmi,
roles r,
USERS U,
USER_ROLES UR
where
mi.ID=rmi.MIT_ID and
rmi.ROL_ID=r.id and
r.id=UR.ROLE_ID and
U.ID=UR.USER_ID and
U.NAME='jones'
start with mi.men_id is null
connect by prior mi.ID=mi.men_id
Saída
1 Menu1 Menu1 /images/home.gif
3 Help Help
4 page1 a 1 page1 1 /images/email.gif
7 about d 1 about 3
Insert into MENU_ITEMS (ID,NAME,SHORTCUT,DISPLAY_SEQUENCE,ACTION,MEN_ID,ICON)
values (1,'Menu1',null,null,'Menu1',null,'/images/home.gif');
Insert into MENU_ITEMS (ID,NAME,SHORTCUT,DISPLAY_SEQUENCE,ACTION,MEN_ID,ICON)
values (2,'Menu2',null,null,'Menu2',null,null);
Insert into MENU_ITEMS (ID,NAME,SHORTCUT,DISPLAY_SEQUENCE,ACTION,MEN_ID,ICON)
values (3,'Help',null,null,'Help',null,null);
Insert into MENU_ITEMS (ID,NAME,SHORTCUT,DISPLAY_SEQUENCE,ACTION,MEN_ID,ICON)
values (4,'page1','a',1,'page1',1,'/images/email.gif');
Insert into MENU_ITEMS (ID,NAME,SHORTCUT,DISPLAY_SEQUENCE,ACTION,MEN_ID,ICON)
values (5,'page2','b',2,'page2',1,null);
Insert into MENU_ITEMS (ID,NAME,SHORTCUT,DISPLAY_SEQUENCE,ACTION,MEN_ID,ICON)
values (6,'page3','c',1,'page3',2,'/images/photo.gif');
Insert into MENU_ITEMS (ID,NAME,SHORTCUT,DISPLAY_SEQUENCE,ACTION,MEN_ID,ICON)
values (7,'about','d',1,'about',3,null);
insert into ROLES (ID, NAME)
values (1, 'administrator');
insert into ROLES (ID, NAME)
values (2, 'user');
Insert into ROLE_MENU_ITEMS (ROL_ID,MIT_ID) values (1,4);
Insert into ROLE_MENU_ITEMS (ROL_ID,MIT_ID) values (1,5);
Insert into ROLE_MENU_ITEMS (ROL_ID,MIT_ID) values (1,6);
Insert into ROLE_MENU_ITEMS (ROL_ID,MIT_ID) values (1,7);
Insert into ROLE_MENU_ITEMS (ROL_ID,MIT_ID) values (2,4);
Insert into ROLE_MENU_ITEMS (ROL_ID,MIT_ID) values (2,7);
Insert into USER_ROLES (USER_ID,ROLE_ID) values (2,2);
Insert into USER_ROLES (USER_ID,ROLE_ID) values (1,1);
Insert into USER_ROLES (USER_ID,ROLE_ID) values (3,2);
Insert into USERS (ID,NAME,PASSWORD) values (2,'scott','scott');
Insert into USERS (ID,NAME,PASSWORD) values (1,'john','john');
Insert into USERS (ID,NAME,PASSWORD) values (3,'jones','jones');
Solução
esquema ruim, mas é possível
1. selecione todos os menu_id para a função do usuário
select RMI.MIT_ID
from ROLE_MENU_ITEMS RMI
, ROLES R
, USERS U
, USER_ROLES UR
where RMI.ROL_ID = R.ID
and R.ID = UR.ROLE_ID
and U.ID = UR.USER_ID
and U.NAME = 'jones'
2. consulta de hierarquia reversa
select MI.*
, max(LEVEL) over () + 1 - level as rev_level
, lpad(' ', (max(LEVEL) over () + 1 - LEVEL) * 3, ' ') || MI.NAME as LEVEL_NAME
, rownum RN
from MENU_ITEMS MI
connect by prior MEN_ID = ID
start with ID IN (select RMI.MIT_ID
from ROLE_MENU_ITEMS RMI
, ROLES R
, USERS U
, USER_ROLES UR
where RMI.ROL_ID = R.ID
and R.ID = UR.ROLE_ID
and U.ID = UR.USER_ID
and U.NAME = 'jones')
3. reverso (consulta de hierarquia reversa)
select ID
, NAME
, SHORTCUT
, DISPLAY_SEQUENCE
, ACTION
, MEN_ID
, ICON
, LEVEL_NAME
from
(
select MI.*
, max(LEVEL) over () + 1 - level as rev_level
, lpad(' ', (max(LEVEL) over () + 1 - LEVEL) * 3, ' ') || MI.NAME as LEVEL_NAME
, rownum RN
from MENU_ITEMS MI
connect by prior MEN_ID = ID
start with ID IN (select RMI.MIT_ID
from ROLE_MENU_ITEMS RMI
, ROLES R
, USERS U
, USER_ROLES UR
where RMI.ROL_ID = R.ID
and R.ID = UR.ROLE_ID
and U.ID = UR.USER_ID
and U.NAME = 'jones')
)
group by ID --distinct with order
, name
, SHORTCUT
, DISPLAY_SEQUENCE
, ACTION
, MEN_ID
, ICON
, LEVEL_NAME
order by min(-RN)
possível manter o tipo de itens raiz por ID, usando uma subconsulta
select ID
, NAME
, SHORTCUT
, DISPLAY_SEQUENCE
, ACTION
, MEN_ID
, ICON
, LEVEL_NAME
from
(
select ID
, NAME
, SHORTCUT
, DISPLAY_SEQUENCE
, ACTION
, MEN_ID
, ICON
, MAX(LVL) OVER () + 1 - LVL
, rpad(' ', (max(LVL) over () + 1 - LVL) * 3, ' ') || NAME as LEVEL_NAME
, RN
from (
select MI.*
, rownum RN
, level LVL
from MENU_ITEMS MI
connect by prior MEN_ID = ID
start with ID IN (select RMI.MIT_ID
from ROLE_MENU_ITEMS RMI
, ROLES R
, USERS U
, USER_ROLES UR
where RMI.ROL_ID = R.ID
and R.ID = UR.ROLE_ID
and U.ID = UR.USER_ID
and U.NAME = 'jones')
order siblings by -ID
)
)
group by ID --distinct with order
, name
, SHORTCUT
, DISPLAY_SEQUENCE
, ACTION
, MEN_ID
, ICON
, LEVEL_NAME
order by min(-RN)
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