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SIMDBM - January 1978.
Author: Kalle M#kil#, National Bureau of Statistics,
S-104 50 STOCKHOLM, Sweden.
This is a short description of the version of SIMDBM delivered with
version 4 of the DECsystem-10/20 SIMULA system. It just specifies
what files there are, and in what context they are needed. SIMDBM
contains the following SIMULA source code modules:
SIMDBM (prefix: SAFEIO)
DBMSET (prefix: SIMDBM)
DBSORT (prefix: DBMSET)
DBMMIN (No prefix: a slightly reduced version of SIMDBM)
Either SIMDBM can be used alone as prefix to a user program or, when
set handling is required, DBMSET can be used. DBMMIN is a pure subset
of SIMDBM, and can be used as prefix (instead of SIMDBM) in many
applications. Only a few rather advanced facilities are missing.
DBSORT contains a few procedures to handle sorted arrays of records.
The following utility programs are available: (the prefix chain is
given within parentheses). They are main programs that can be
compiled and executed provided that all the modules in their prefix
chains have been compiled first.
SPEC (safeio, simdbm)
PREP ( " )
PREP2 ( " )
FETCH (safeio, simdbm, dbmset, fetch1, fetch2)
SPECIF and MULTI are no utility programs, but just sample programs
to demonstrate how record specifications are created dynamically, and
how several data bases can be handled in parallel.
The following are general utility programs without direct connection
DIRED (to edit SIMULA direct files)
TRANSF (to edit a source program containing specifications for
reduced versions of itself)
There are three files with extension RNO. From them printable files
can be created by using RUNOFF.
SIMDBM New edition of a previous report about the basic system.
NEWDBM Further information on the basic system and also on all the
utility programs mentioned above.
FETCH Mainly a description of the program FETCH (in swedish).
Almost a subset of NEWDBM.RNO.
DIRED.HLP (in swedish)
LOAD.HLP (in english)
SIMDBM.HLP(similar to this file, but in swedish)
For DIRED and SPEC, fairly detailed help information can be obtained
by running the programs and replying with ? to all questions.
Help information for the program FETCH.
When this program is used and help information is required, it must
first be loaded into the data base from the file HMESS.DMP. That file
contains the help messages in a form suitable for loading via DBLOAD.
How this is done is described in the report NEWDBM.RNO. The file
HMESS.MIC can be used to do that: just type
DO HMESS ownbas
where ownbas is the name of your data base.
Two small procedures ARRLGD and ARRTXT are used internally in SIMDBM.
They are contained in the files ARRLGD.MAC and ARRTXT.MAC, which also
can be compiled by the SIMULA compiler to generate the corresponding
ATR files. Usually these procedureas are part of LIBSIM.
Summary - files delivered with SIMULA version 4 in january 1978.
SIMDBM.SIM TRANSF.SIM ARRLGD.MAC
DBMMIN.SIM DIRED.SIM ARRTXT.MAC
SIMDBM.RNO SIMDBM.HLP HMESS.DMP
NEWDBM.RNO LOAD.HLP HMESS.MIC
FETCH.EXE (these are the most frequently used utilities)
How to get started with SIMDBM.
a. Read this document carefully.
b. Have a look at the report in SIMDBM.RNO.
c. Read the first chapters of the report in NEWDBM.RNO, particularly
on the programs SPEC and FETCH, which comprise a complete
non-programmers interface to SIMDBM data bases.
d. Try running SPEC and FETCH on a small example. Before running
FETCH, load its help information into your base as described
above. Then use ? to request help when running it.
e. If you are prepared to write your own application programs, study
the coded examples in SIMDBM.RNO (appendices) and then code your
program using the data manipulation procedures described in that
f. If you are uncertain as to what these procedures do, do not
hesitate to look at the source code of SIMDBM. To an experienced
SIMULA programmer that might be the best documentation.