Re: Help on Timestamp

Question

Im using oracle 10g and i want to use TIMESTAMP data type for the concurrency purpose. Can i declare that TimeStamp filed as AUTOMATIC. so when im doing insert or upadte for that table that timestamp filed automatically will get change.
I tried some example but it doesnt give me suitable answer. Herewith im sending that example also,
ex:
create table TEMP
( CODE integer primary key,
NAME VARCHAR2(10) ,
TIMEST AUTOMATIC as CURRENT_TIMESTAMP
help me on this, little bit urgent please.
thanks
nalin.

Answer 1

Justin:
That works for inserts, but the OP seems to want updates too.
Nalin:
You will need to use a trigger to populate the timestamp field on updates. Define the table as Justin did. As long as you do not try to insert a value in col1, it will be set to systimestamp (i.e. current time) automatically. You can define a trigger along the lines of:
CREATE TRIGGER ts_bu
   BEFORE UPDATE ON ts
   FOR EACH ROW
BEGIN
   SELECT systimestamp INTO :new.col1 FROM dual;
END;HTH
John