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 7 Searching for records in the database.
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  -- gdbm interface: datum gdbm_fetch (GDBM_FILE DBF, datum KEY)
      Looks up a given KEY and returns the information associated with
      it.  The `dptr' field in the structure that is returned points to a
      memory block allocated by `malloc'.  It is the caller's
      responsibility to free it when no longer needed.
 
      If the `dptr' is `NULL', no data was found.
 
      The parameters are:
 
     DBF
           The pointer returned by `gdbm_open'.
 
     KEY
           The search key.
 
 An example of using this function:
 
      content = gdbm_fetch (dbf, key);
      if (content.dptr == NULL)
        {
          fprintf(stderr, "key not found\n");
        }
      else
        {
          /* do something with content.dptr */
        }
 
    You may also search for a particular key without retrieving it:
 
  -- gdbm interface: int gdbm_exists (GDBM_FILE DBF, datum KEY)
      Returns `true' (`1') if the KEY exists in DBF and `false' (`0')
      otherwise.
 
      The parameters are:
 
     DBF
           The pointer returned by `gdbm_open'.
 
     KEY
           The search key.
 

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