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'Invalid value for field' Error

Posted on 2004-03-22
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Last Modified: 2012-05-04
I have a form that access a table through a TADOQuery control which has its contents edited through a Data Grid.

It was working fine until I added a calculated field to the TADOQuery and inserted code in its OnCalcFields event like this...

with ADOQUERYTABLEX do begin

      ADOQUERYTABLEXnewfield.Value
      :=  FieldByName('FIELDY').Value * FieldByName('FIELDZ').Value ;

end;

Now whenever I try to assign any values to the table's other fields, the following exception is raised.

"Invalid value for field 'FIELDX' "

Whats going on?
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Question by:ziche
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1 Comment
 
LVL 27

Accepted Solution

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kretzschmar earned 200 total points
ID: 10647883
if fieldy or fieldz is null such error may raised

replacement

      ADOQUERYTABLEXnewfield.asFloat
      :=  FieldByName('FIELDY').asFloat * FieldByName('FIELDZ').asFloat ;

meikl ;-)

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