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pns: c source code:  DB.C
 -  a low-impact DBMS (Data Base Management System)

Source code files (as raw text) -
                     (no code ... yet)

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db.c

The purpose of db.c is to provide a low-impact (fast,
not a lot of overhead) DBMS (Data Base Mangement System)
for small (eg, micro-controllers) or stand-alone apps.



Tentatively.....

We start with a .dsc (descriptor) file describes record types

  
   # this-file:  mailist.dsc                 # (just an example)

   RECORD personal_info.desc  # Key is optional    "#" denotes a comment

                # we expect data files like  math01.dbd
                ! a DATA file .dbd  (see below)
     str name
     str addr1
     str addr2
     str city from us_city.dat  ! external DATA file 
     str state                  !   determines RANGE of values
     str zip
   END record


NOTE we explicitly write  personal_info.DESC - to indicate the
     descriptor. Try NOT to have files named xyz.dsc and
     then either inside it or somewhere else
     a RECORD DESCRIPTOR called xyz.desc (the same thing)

A "db" data file .dbd might look like this:

   # math01.dbd      
   load mailist.dsc      # a command just in case
   format personal_info.desc
   data csv ";"   - comma separated values use ";" for field separator
     Jones, Jughead ; 123 Merrydale Lane ; ; Riverdale ; IN ; 47408-1521
                                          ^ note null (empty) string 
                                                 value for "addr2"
     ...etc.

   end data


 

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