Trigger updating inserting

create or replace trigger update_emp_thru_outemp_view instead of update on outemp referencing new as new begin update emp set ename = :new.ename, empno = :new.empno, job = :new.job, mgr = :new.mgr, hiredate = :new.hiredate, sal = :new.sal, comm = :new.comm, deptno = ( select deptno from dept where dname = :new.dname ) where empno = :old.empno; if ( sql%rowcount = 0 ) then raise_application_error ( -20001, 'Error updating the outemp view !!!' ); end if; end; select * from emp where ename = 'C Farmer'; EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO ---------- ---------- --------- ---------- --------- ---------- ---------- 3456 C Farmer DBA 7839 01-JUL-02 4000 4 40 1 row selected.LAST_APPLIED_DATE,'DD-MON-YYYY'))/12 INTO years_since_last_applied FROM dual; -- Check whether years_since_last_applied is greater than 2 years or not IF (years_since_last_applied -- setting date format to to 'DD-MON-YYYY' alter session set nls_date_format = 'DD-MON-YYYY'; INSERT INTO job_openings VALUES (1,'Mark','Sharma',10,'01-JAN-2012'); INSERT INTO job_openings VALUES (2,'Praveen','Kumar',4,'01-DEC-2010'); INSERT INTO job_openings VALUES (3,'Rahul','Kohli',6,null); -- output 1 rows inserted. TRG_BEFORE_EMP_UPDATE' -- Try to update last_Applied_Date which is less than 2 years UPDATE job_openings SET LAST_APPLIED_DATE = '10-JUN-2016' where APPLICATION_ID = 3; -- error Error report - ORA-20000: Previous application attempt must not be done in last 2 years. TRG_BEFORE_EMP_UPDATE", line 15 ORA-04088: error during execution of trigger 'SYSTEM. UPDATED_DATE := sysdate; END; -- setting date format to to 'DD-MON-YYYY' alter session set nls_date_format = 'DD-MON-YYYY'; INSERT INTO person_records VALUES (101,'Devil','Khedut',sysdate,null,null); INSERT INTO person_records VALUES (102,'Kanji','Yadav',sysdate,null,null); -- output 1 rows inserted. CREATE TABLE bank_transactions_audit ( TXN_ID number(10), TXN_NUMBER varchar2(20), PARTY_NAME varchar2(50), TXN_DATE date, CREATED_BY varchar2(20), CREATED_DATE date ); --Creating Trigger CREATE OR REPLACE TRIGGER trg_before_update_txn_audit BEFORE UPDATE ON bank_transactions FOR EACH ROW BEGIN -- Insert OLD values in audit table for logging purpose INSERT INTO bank_transactions_audit VALUES(: OLD. TRG_BEFORE_EMP_UPDATE' --Creating person_records table. CREATE TABLE person_records ( PERSON_ID number(10) primary key, FIRST_NAME varchar2(50), LAST_NAME varchar2(50), HIRE_DATE date, UPDATED_BY varchar2(20), UPDATED_DATE date ); CREATE OR REPLACE TRIGGER trg_before_person_update BEFORE UPDATE on person_records FOR EACH ROW DECLARE username varchar2(20); BEGIN SELECT USER INTO username FROM dual; -- Setting updated_by and updated_Date values. A trigger is a pl/sql block structure which is fired when a DML statements like Insert, Delete, Update is executed on a database table.

It is important to maintain the history of the prices of the products.

A scalar value may also be associated with an UPDATE statement, though this is not very common (as UPDATE statements are usually looking for dynamic defaults): keyword arguments also accept Python functions.

These functions are invoked at the time of insert or update if no other value for that column is supplied, and the value returned is used for the column’s value.

To access the context, provide a function that accepts a single ).

This method returns a dictionary of column-key to values that represents the full set of values for the INSERT or UPDATE statement.

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