Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Fri, 30 Apr 2010 10:23:41 -0500

On Friday 30 April 2010 05:12:26 Luedeke Andreas wrote:
> Just be aware of a minor pitfall:
> if one of the fields does not exist for one of your records, it will be
> just missing in the output.
> E.g.
>
>     dbl * "RTYP PREC EGU DTYP DESC"
>
>     test:1,"bi","Soft Channel","desc of test:1"
>     test:2,"calc","1","unit","","desc of test:2"
>     test:3,"longout","unit","Soft Channel","desc of test:3"
>
> So if you want to parse the output, it's saver to generate extra files
> for each field that is not common to all records. (Note: 'calc' records
> have a DTYP field, it just happens to be always NIL)

(All record types must have a DTYP field, it's part of dbCommon.)

The first parameter to dbl is the record type (it doesn't actually support 
wild-cards though, "*" or "" are special strings that are explicitly tested 
for and mean all types), so to avoid the issue of missing fields you could 
list each record type separately, giving the fields you're interested in for 
that type:
    dbl bi "RTYP ZRST ONST DTYP DESC" > bi-data.txt
    dbl ai "RTYP PREC EGU DTYP DESC" > ai-data.txt
    dbl calc "RTYP PREC EGU CALC DESC" > calc-data.txt
etc.

- Andrew
-- 
The best FOSS code is written to be read by other humans -- Harald Welte

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System