kurs:instead_of_trigger
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kurs:instead_of_trigger [2010/05/18 11:15] 127.0.0.1 external edit |
kurs:instead_of_trigger [2010/06/09 15:39] mh |
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| <code> | <code> | ||
| - | create table new_emps as select | + | create table my_emp as select |
| employee_id, first_name, last_name, salary, department_id | employee_id, first_name, last_name, salary, department_id | ||
| from employees | from employees | ||
| - | + | create table my_dep as select | |
| - | create table new_deps as select | + | |
| department_id, department_name from departments | department_id, department_name from departments | ||
| - | </code> | ||
| - | <code> | + | CREATE OR REPLACE VIEW EMPDEP ( |
| - | CREATE OR REPLACE VIEW view_emp_dep ( | + | FIRST_NAME, LAST_NAME, SALARY, DEPARTMENT_NAME) AS |
| - | first_name, | + | select first_name, last_name, salary, |
| - | last_name, | + | department_name from my_emp e, my_dep d |
| - | department_name, | + | where e.department_id = d.department_id |
| - | salary ) | + | |
| - | AS | + | |
| - | SELECT new_emps.first_name, | + | |
| - | new_emps.last_name, | + | |
| - | new_deps.department_name, | + | |
| - | new_emps.salary | + | |
| - | FROM new_deps, new_emps | + | |
| - | WHERE ((new_emps.department_id = new_deps.department_id(+))) | + | |
| - | / | + | |
| </code> | </code> | ||
| <code> | <code> | ||
| - | -- Start of DDL Script for Trigger HR.TRG_VIEW_EMP_DEP | ||
| - | -- Generated 13.11.2008 12:57:27 from HR@ORCL | ||
| - | |||
| - | CREATE OR REPLACE TRIGGER trg_view_emp_dep | ||
| - | INSTEAD OF | ||
| - | INSERT OR DELETE OR UPDATE | ||
| - | ON view_emp_dep | ||
| - | REFERENCING NEW AS NEW OLD AS OLD | ||
| declare | declare | ||
| - | dep_id departments.department_id%type; | + | dep_id my_dep.department_id%type; |
| begin | begin | ||
| + | if :new.department_name is not null then | ||
| + | begin | ||
| + | select department_id into dep_id from my_dep where | ||
| + | department_name = :new.department_name; | ||
| + | exception | ||
| + | when no_data_found then | ||
| + | insert into my_dep (department_id, department_name) | ||
| + | values (hr_seq.nextval,:new.department_name) | ||
| + | returning department_id into dep_id; | ||
| + | end; | ||
| + | end if; | ||
| + | |||
| if inserting then | if inserting then | ||
| - | select department_id into dep_id from new_deps where | + | insert into my_emp ( |
| - | department_name = :new.department_name; | + | |
| - | + | ||
| - | insert into new_emps ( | + | |
| - | EMPLOYEE_ID, | + | |
| FIRST_NAME, | FIRST_NAME, | ||
| LAST_NAME, | LAST_NAME, | ||
| Line 48: | Line 37: | ||
| DEPARTMENT_ID) | DEPARTMENT_ID) | ||
| values ( | values ( | ||
| - | employees_seq.nextval, | ||
| :new.first_name, | :new.first_name, | ||
| :new.last_name, | :new.last_name, | ||
| Line 54: | Line 42: | ||
| dep_id); | dep_id); | ||
| elsif deleting then | elsif deleting then | ||
| - | delete from new_emps where | + | delete from my_emp where |
| :old.last_name = last_name and | :old.last_name = last_name and | ||
| :old.first_name = first_name; | :old.first_name = first_name; | ||
| else | else | ||
| - | update new_emps set | + | update my_emp set |
| first_name = nvl(:new.first_name, :old.first_name), | first_name = nvl(:new.first_name, :old.first_name), | ||
| last_name = nvl(:new.last_name, :old.last_name), | last_name = nvl(:new.last_name, :old.last_name), | ||
| salary = :new.salary, | salary = :new.salary, | ||
| department_id = | department_id = | ||
| - | (select department_id from new_deps where | + | (select department_id from my_dep where |
| - | department_name = :old.department_name) | + | department_name = nvl(:new.department_name,:old.department_name)) |
| where | where | ||
| first_name = :old.first_name and | first_name = :old.first_name and | ||
| Line 71: | Line 59: | ||
| end if; | end if; | ||
| end; | end; | ||
| - | / | ||
| </code> | </code> | ||
kurs/instead_of_trigger.txt · Last modified: 2014/09/10 21:22 (external edit)
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