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I'm currently learning how to use the datatool package. I have a lot of .txt-files that need to be processed automatically. But if datatool loads a wrong kind of .txt-file I need to be able to check it. The way I want to do it is to check the key's of the columns, but the command \DTLgetkeyforcolumn returns the error:

Undefined control sequence.
<argument> \db@row@id@w

l.58 \DTLgetkeyforcolumn{\colkey}{data}{1}

I have absolutely no clue what that means... The source code can be found in the datatool manual. Search for the function and you will get to it. I really don't understand it, and can't see anywhere \db@row@id@w. Could it be a bug in the package? Trying to redefine the function only results in errors.

Edit:
Minimal working example:

\documentclass{article}

\usepackage{datatool}
\DTLloadrawdb{data}{data.txt} %load data.txt, store in database data

\begin{document}
  % Display the table, bold are the headers
  \DTLdisplaydb{data}

  % Search for header ColTwo and store index into \colindex
  \DTLgetcolumnindex{\colindex}{data}{ColTwo}
  \colindex % returns 2

  % Search the index and store the header into \colkey
  \DTLgetkeyforcolumn{\colkey}{data}{\colindex} % Error
  \colkey

\end{document}

data.txt

ColOne,ColTwo,ColThree
a,b,2
c,d,5

Gives no output at all.

share|improve this question
    
Could you post a minimal working example (MWE) that illustrates your problem? It helps us to track the error down. :) –  Paulo Cereda Jul 13 '12 at 16:51
    
Added, but it doesn't work mind you ;) –  Didii Jul 16 '12 at 7:43
    
Seems like a bug. Maybe you should contact the package maintainer. –  canaaerus Jul 16 '12 at 7:55
    
I've sent a mail to him, thanks for the reply. –  Didii Jul 16 '12 at 8:56

1 Answer 1

up vote 1 down vote accepted

I've sent a mail to the package maintainer (Nicola Talbot) who gave me a temporary workaround. Paste the following under \usepackage{datatool}. This bug will be fixed in a future patch.

\makeatletter
\renewcommand*{\@dtl@getkeyforcolumn}[3]{%
 \def\@dtl@get@keyforcolumn##1% before stuff
   \db@plist@elt@w% start of block
   \db@col@id@w #3\db@col@id@end@% index
   \db@key@id@w ##2\db@key@id@end@% key
   \db@type@id@w ##3\db@type@id@end@% data type
   \db@header@id@w ##4\db@header@id@end@% header
   \db@col@id@w #3\db@col@id@end@% index
   \db@plist@elt@end@% end of block
   ##5\q@nil{\def#1{##2}}%
 \edef\@dtl@tmp{\expandafter\the\csname dtlkeys@#2\endcsname}%
 \expandafter\@dtl@get@keyforcolumn\@dtl@tmp
   \db@plist@elt@w% start of block
   \db@col@id@w #3\db@col@id@end@ %index
   \db@key@id@w \@nil\db@key@id@end@% key
   \db@type@id@w \db@type@id@end@% data type
   \db@header@id@w \db@header@id@end@% header
   \db@col@id@w #3\db@col@id@end@% index
   \db@plist@elt@end@% end of block
   \q@nil
}
\makeatother
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