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Invalid Index Descriptor

Posted on 2001-06-12
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Last Modified: 2012-06-27

Why am I getting the "Invalid Index Descriptor" error when I try to create this DB at runtime?

I want to create a DBase table named Index.dbf with a maintained index called Index.mdx, indexing on Field 'Descr'.

var NewTable : TTable;
...
NewTable := TTable.Create(fPickDir); // fPickDir is current form
NewTable.Active := False;
NewTable.TableName := sDummy; // sDummy is path+'index.dbf'
NewTable.TableType := ttDBase;
NewTable.FieldDefs.Clear;
NewTable.FieldDefs.Add('DESCR', ftString, 50, False);
NewTable.FieldDefs.Add('FILENAME', ftString, 50, False);
NewTable.IndexDefs.Clear;
NewTable.IndexDefs.Add('Index','Descr',[ixExpression]);
NewTable.CreateTable;  // ** Error Happens Here
NewTable.Free;

Thanks in advance,
WKHays
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Question by:wkhays
5 Comments
 
LVL 1

Expert Comment

by:Phoenix_s
ID: 6183624
sounds like the BDE is having a fir because you names the index, INDEX.

try to change the index name to something like

IX_DESCR  which will make the index file IX_DESCR.MDX

if you have any other indexes you need set up, it might be an idea to adhere to a standard naming convention for all indexes utilizing IX_<field-indexed>

so that if there was a field called user which needed indexing, the index would be names IX_USER, which would then create a file called IX_USER.MDX.

hope this helps
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 6185336
guessing the expression is missed in the index-definition
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 6185340
try

NewTable.IndexDefs.Add('Index','Descr',[ixPrimary]);
0
 
LVL 17

Accepted Solution

by:
geobul earned 200 total points
ID: 6185712
Hi,

...
NewTable.IndexDefs.Clear;
NewTable.CreateTable;
NewTable.AddIndex('Index','Descr',[ixExpression]);
NewTable.Free;

Regards, Geo
0
 
LVL 4

Author Comment

by:wkhays
ID: 6188414
Thanks all:

Phoenix - I really want my index to be called index.mdx to match a file called index.dbf... There are already dozens of these in existence that were manually made ... To late to change the convention.

kretzschmar - According to the online help, [ixPrimary] is not valid for DBase files.

GeoBul - Works like a charm... Thanks!!!

-WKHays

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