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SetRange() on multifield indexes.

Posted on 1998-06-30
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Last Modified: 2010-05-18
Hello there,

I've created index for few fields. I'm willing to apple range for my table, and seems I can not do that.
For example I've two fields: Symbol and Number. I've created index for these fields. TotalIndex.
Now, I'm trying something like this:

  with Table1 do
  begin
    IndexName := 'TotalIndex';
    SetRange(['a', 1],  ['m', 10]);
    ApplyRange;
  end;

I'm expecting to see all records with Symbol's value between 'a' and 'm' and
and Number's value between 1 and 10 but nothing happens. At all.
When I create separate indexes for each co;umn and write for example:

  with table1 do
  begin
    IndexName := 'NumIndex';
    SetRangeStart;
    FieldByName('Number').AsInteger := 1;
    SetRangeEnd;
    FieldByName('Number').AsInteger := 10;
    ApplyRange;
  end;

I see just what I expected to see. But I want to use one index for all fields. Possible? How?
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Question by:_art_
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4 Comments
 
LVL 5

Expert Comment

by:ronit051397
ID: 1356648
You didn't set the range properly. This range shows symbols between 'a' and 'm' that also have numbers between 1 and 10. If you want to see both then you should use Filter instead of Range:

 with table1 do
 begin
     Filter:='SYMBOL<='+Chr(39)+'m'+Chr(39)+' AND                 SYMBOL>='+Chr(39)+'a'+Chr(39)+' OR NUMBER<=10 AND NUMBER>=1';
     Filtered:=True;
end;  

0
 

Author Comment

by:_art_
ID: 1356649
ronit,

Exactly what I need! I wanna see  records whose symbols between 'a' and 'm' and from them those where numbers between 1 and 10. Not both cases separate..
I know filters still would be the right suggestion but at some reasons I'd prefer not to use them.
0
 
LVL 8

Expert Comment

by:ZifNab
ID: 1356650
Hi _art_,

Why don't you want to use Filters?

Well, maybe this is possible :

 1. Take two tables, one master other detail.
 2. Filter the master table with a to m
 3. Filter the slave with 1 to 10

Never tried it, don't even know if it will work, but you can try it.

Regards, ZiF.
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LVL 3

Accepted Solution

by:
vladika earned 200 total points
ID: 1356651
I think with SetRange it's impossible.
Why?
Let Table have such date
SYMBOL      NUMBER
----------------------------------
a                     -1
a                      1
b                     -5
b                    10
m                    -1
m                   11
z                     0

I ordered it according to index.

SetRange(['a', 1],  ['m', 10]) set TWO BOUNDARIES (and ONE range) in ordered table.
First boundary between ('a',-1) and ('a',1).
Second boundary between ('m',-1') and ('m',11)
So you can see ('b',-5), ('m',-1) etc

You want set many ranges. It's impossible with SetRange

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