RE: Objects and Source

["Sims, Ken" <KSIMS@xxxxxxxxxxxxxxxx>]

Hi Bill -

>Date: Tue, 1 Feb 2000 09:39:32 -0500 
>From: Bill Graziano <Bill.Graziano@besi.com>
>Subject: Objects and Source
 ...
>I am getting ready to add some long awaited structure to our AS/400. What
>are your recommendations regarding objects and source in the same
libraries?
>I know some prefer to use separate libraries and some prefer to use the
same
>libraries. Is this just a personnal preference or are there distinct
>advantages?

Here's my opinion ...

Database libraries
  Contain
    Physical and logical files that contain data
    Physical and logical files that do not contain data but are
      template files for work files in QTEMP that will contain data
    Data areas that contain changing data or configuration information
      that is specific to a particular environment
    Any other objects that are environment specific
  Do not contain any source files
Program libraries
  Contain
    Programs and modules
    Device files (display, printer, etc)
    Physical files are used for externally described data structures
      or OPNQRYF record formats
    Data areas that contain configuration that is not specific to a
      particular environment
    Commands
    Source files for the objects contained in the library, using
      the standard IBM source file names
    Source for the objects contained in the database libraries can
      either be in one program library, split across program libraries
      by application, or in a special library

This structure makes it easy to have test environments.
The user portion of the library list for the production environment contains
QTEMP, the production database library, and all of the program libraries.
To make a test environment, just CPYLIB the production database library to a
test database library.  Create another library for objects being tested.
The user portion of the library list is QTEMP, the changed objects test
library, the test database library, and all of the program libraries.

For this to work, there should not be any hard-coded library names except
QTEMP.  Each database library should contain a data area with its own name.
If a program needs the database library name for some reason, retrieve the
contents of the data area (which would have the same name in each database
library) and plug it in.

Ken
Southern Wine and Spirits of Nevada, Inc.
Opinions expressed are my own and do not necessarily represent the views of
my employer or anyone else.

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