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Reference for unit 'DB' (#fcl)

TLookupList.FirstKeyByValue

Find the first key that matches a value

Declaration

Source position: db.pas line 261

public function TLookupList.FirstKeyByValue(

const AValue: Variant

):Variant;

Arguments

AValue

Value to match key with.

Function result

First key that has AValue associated with it.

Description

FirstKeyByValue does a reverse lookup: it returns the first key value in the list that matches the AValue value. If none is found, Null is returned. This mechanism is quite slow, as a linear search is performed.

Errors