Youarebuildingtwoforms.Eachformhasabuttonandanon－basetablefield.Whenthebuttonisp
Youarebuildingtwoforms.Eachformhasabuttonandanon-basetablefield.Whenthebuttonispressed,acomplicatedcalculationisexecuted.Thecalculationisthesameforbothforms.The calculationcodedoesnotqueryorchangethedatainthedatabase.Whenthecalculationcompletes,itreturnsasinglevaluetothenon-basetablefield.Tooptimizeperformanceandmaintainability,whichPL/SQLstructureshouldbeused?（）
A.Atriggerineachform.
B.Asubprogramineachform.
C.Astoredsubprograminthedatabase.
D.Asubprograminalibrarythatisattachedtoeachform.
正确答案：参考D
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