Youarebuildingtwoforms.Eachformhasabuttonandanon－basetablefield.Whenthebuttonispressed,aco

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Youarebuildingtwoforms.Eachformhasabuttonandanon-basetablefield.Whenthebuttonispressed,acomplicatedcalculationisexecuted.Thecalculationisthesameforbothforms.The calculationcodedoesnotqueryorchangethedatainthedatabase.Whenthecalculationcompletes,itreturnsasinglevaluetothenon-basetablefield.Tooptimizeperformanceandmaintainability,whichPL/SQLstructureshouldbeused?（）

A.Atriggerineachform.

B.Asubprogramineachform.

C.Astoredsubprograminthedatabase.

D.Asubprograminalibrarythatisattachedtoeachform.

参考答案:

参考D

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