我想請問一下在什麼情況下要到adoquery的OnCalcFields下，來做程式的執行，而什麼事件會觸發這個事件，他最主要的功能是什麼!?

他最主要的功能是什麼!?
==>主要功能：將此DataSet的某幾個欄的值加減後丟到某個FieldKind為fkCalcuilated的欄位中。
==>此欄可以是VirtureField，即不須真有此欄，只須右點此AdoQuery選New Field及選Calculated就可以了
==>如果是實體欄位指定FieldKind為fkCalculated，執行時要注意要設此TField為ReadOnly

adoquery的OnCalcFields下，來做程式的執行，而什麼事件會觸發這個事件，
==>OnLineHelp
OnCalcFields is triggered when:
A dataset is opened.
A dataset is put into dsEdit state.
A record is retrieved from a database.
When the AutoCalcFields property is true, OnCalcFields is also triggered when:
Focus moves from one visual control to another, or from one column to another is a data-aware grid control and modifications were made to the record.

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Kevin