If updating then
For example, you can use the MERGE statement to perform the following operations: It is important to understand how the source and target data are merged into a single input stream and how additional search criteria can be used to correctly filter out unneeded rows.If you need to determine if the value is changing, you'll still need to code comparison logic for :old and :new values. Since I would like to do the same things if the row is inserted, updated, or deleted, I would like to know what's happening in the trigger.Oracle Database XE automatically executes a trigger when a specified event takes place, which usually is a DML statement being issued against the table.The types of triggers are: Trigger names must be unique with respect to other triggers in the same schema.I think I can manage to find if the row is inserted or updated (I can check the old_buffer with the new_buffer). Detecting the DML Operation That Fired a Trigger If more than one type of DML operation can fire a trigger (for example, ON INSERT OR DELETE OR UPDATE OF Emp_tab), the trigger body can use the conditional predicates INSERTING, DELETING, and UPDATING to check which type of statement fire the trigger.
CREATE or REPLACE TRIGGER test001 AFTER INSERT OR UPDATE OR DELETE ON tabletest001 REFERENCING OLD AS old_buffer NEW AS new_buffer FOR EACH ROW WHEN (new_buffer.field1 = 'HBP00' OR old_buffer.field1 = 'HBP00') DECLARE Operation NUMBER; Customer Code CHAR(10 BYTE); BEGIN IF DELETING THEN Operation := 3; Customer Code := :old_buffer.field1; END IF; IF INSERTING THEN Operation := 1; Customer Code := :new_buffer.field1; END IF; IF UPDATING THEN Operation := 2; Customer Code := :new_buffer.field1; END IF; // DO SOMETHING ...
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SQL select * from Employee 2 / ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION ---- -------------------- -------------------- --------- --------- ---------- ---------- --------------- 01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected.
In SQL Server 2008, you can perform insert, update, or delete operations in a single statement using the MERGE statement.
I'm coding a Trigger to ensure only one type of money can be set as official.