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Test if old value was blank

HI All,


I have had a search arround but coulnt find anything.


I want to test if a field was previosly blank and now is not then if its not blank execute code. i have everything for if its not blank but i cant work out out to test if it was previosly blank.


do I need to make use of trigger.old?





Seem to have got it with


Account OLDA = trigger.oldMap.get(A.ID);


then reference the filed I want to test with OLDA.fieldtotest


please let me know if I could do this better.





I think this is fine; you will get the previous values (old values) from trigger.old or trigger.oldmap.

If in this way you can refer the field what you want then it is fine.