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kurs:instead_of_trigger [2010/06/09 15:37] mh |
kurs:instead_of_trigger [2011/12/01 15:03] mh |
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+ | <code> | ||
+ | CREATE OR REPLACE VIEW emp_dep ( | ||
+ | first_name, | ||
+ | last_name, | ||
+ | department_name ) | ||
+ | AS | ||
+ | select | ||
+ | first_name, | ||
+ | last_name, | ||
+ | department_name | ||
+ | from departments d join employees e | ||
+ | on d.department_id = e.department_id | ||
+ | / | ||
+ | |||
+ | |||
+ | -- Triggers for EMP_DEP | ||
+ | |||
+ | CREATE OR REPLACE TRIGGER emp_dep_instead_trg | ||
+ | INSTEAD OF | ||
+ | INSERT OR DELETE OR UPDATE | ||
+ | ON emp_dep | ||
+ | REFERENCING NEW AS NEW OLD AS OLD | ||
+ | begin | ||
+ | /* | ||
+ | first_name | ||
+ | last_name | ||
+ | department_name | ||
+ | */ | ||
+ | if inserting then | ||
+ | insert into employees | ||
+ | (employee_id, | ||
+ | first_name, | ||
+ | last_name, | ||
+ | email, | ||
+ | hire_date, | ||
+ | job_id, | ||
+ | department_id | ||
+ | ) values ( | ||
+ | employees_seq.nextval, | ||
+ | :new.first_name, | ||
+ | :new.last_name, | ||
+ | upper(:new.last_name), | ||
+ | sysdate, | ||
+ | 'IT_PROG', | ||
+ | (select department_id from departments | ||
+ | where department_name = :new.department_name) | ||
+ | ); | ||
+ | end if; | ||
+ | end; | ||
+ | / | ||
+ | </code> | ||
+ | |||
<code> | <code> | ||
create table my_emp 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 my_dep as select | ||
department_id, department_name from departments | department_id, department_name from departments | ||
+ | |||
+ | CREATE OR REPLACE VIEW EMPDEP ( | ||
+ | FIRST_NAME, LAST_NAME, SALARY, DEPARTMENT_NAME) AS | ||
+ | select first_name, last_name, salary, | ||
+ | department_name from my_emp e, my_dep d | ||
+ | where e.department_id = d.department_id | ||
</code> | </code> | ||