Unit 'mselookupbuffer'	Package
[Overview][Constants][Types][Classes][Index]	[#msegui]

tcustomlookupbuffer.lookuptext

A lookup buffer cannot distinguish a NULL value from a "zero" value

Declaration

Source position: mselookupbuffer.pas line 250

public function tcustomlookupbuffer.lookuptext(

const integerkeyfieldno: Integer;

const textfieldno: Integer;

const keyvalue: Integer;

const adefault: msestring = ''

):msestring; overload; function tcustomlookupbuffer.lookuptext(

const int64keyfieldno: Integer;

const textfieldno: Integer;

const keyvalue: Int64;

const adefault: msestring = ''

):msestring; overload; function tcustomlookupbuffer.lookuptext(

const stringkeyfieldno: Integer;

const textfieldno: Integer;

const keyvalue: msestring;

const adefault: msestring = ''

):msestring; overload;

Description

A lookup buffer cannot distinguish a NULL value from a "zero" value: lookuptext returns '0' for a NULL integer field, and '' for a NULL text, float or datetime field — the same as it would for an actual 0 or empty string.