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|Java - Interview Questions and Answers|
|Ans. In first case, there would be 2 DB calls in worst case and 1 in best case. In 2nd approach there will be always 2 DB calls.|
Decision on the approach should depend on the following considerations -
1. How costly is the call to DB ? Are we using indices , hibernate etc
If calls to DB are costly , 1st approach should be the choice.
2. Exception Book keeping load upon exception.
The benefit of saving 1st call in approach 1 should be bigger than the Book keeping for the exception.
3. Probability of the exception in first apparoach.
If the DB Table is almost empty, it makes sense to follow Approach 1 as majority of the 1st calls will pass through without exception.
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