Need help on Table Post Code - Function ValidateCity

jemmy · 2005-05-06

Folks,

Anyone knows why we need to add
IF PostCodeRec2.NEXT = 1 THEN
in the following code

ValidateCity(VAR City : Text[30];VAR PostCode : Code[20])

IF NOT GUIALLOWED THEN
  EXIT;
IF City <> '' THEN BEGIN
  SearchCity := City;
  PostCodeRec.SETCURRENTKEY("Search City");
  PostCodeRec.SETFILTER("Search City",SearchCity);
  IF NOT PostCodeRec.FIND('-') THEN
    EXIT;
  PostCodeRec2.COPY(PostCodeRec);
  IF PostCodeRec2.NEXT = 1 THEN
    IF FORM.RUNMODAL(FORM::"Post Codes",PostCodeRec,PostCodeRec.Code) <> 

ACTION::LookupOK THEN
      EXIT;
  PostCode := PostCodeRec.Code;
  City := PostCodeRec.City;
END;

Thanks in advance as always,

Jemmy

Albertvh · 2005-05-06

Hi Jemmy

This code checks if there is more than 1 city in the post code table and if so displays the list of cities with the criteria you have entered.

Regards

Albert

jemmy · 2005-05-06

I removed the line contained with
PostCodeCheck.AddressValIsPostCodeCity;
now it works, but I'm still curious... :?

Alberth, how about if the city is the last record in the list (means that NEXT = 0)?

Albertvh · 2005-05-06

Hi Jemmey
That is correct

jreynolds · 2005-05-06

If there are no records or a single record matching the filter criteria then the function exits immediately. If there are multiple records matching the criteria then the user is asked to select the desired one from a list. The obvious way to code this would be to use the COUNT function and test for COUNT > 1. But this is extremely slow on large tables because it must return the exact count and all we are really interested in is if there is more than one record. Thus, NEXT = 1 tells us that another record is found.

jemmy · 2005-05-08

Hi JReynolds!

Then the last record in the list won't open the form modal.
You have pointed it well. A good trick from the programmer.

Thanks a lot JReynolds! =D>

Jemmy

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Need help on Table Post Code - Function ValidateCity

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