  Step
4 - Environment Catalog
This section describes the Omnidex
Environment Catalog in detail, including syntax, some special design
options to add more functionality to an installation, and variations based
on the underlying database. This section also describes the Omnidex utilities
OAHELPER, OACOMP, and OADECOMP, which can be used to automatically generate,
compile, and decompile an Omnidex Environment Catalog.
The Omnidex Environment Catalog is Omnidex’s view of the structure
of a data base and sets default operating values for Omnidex’s run-time
characteristics. The Omnidex Environment Catalog is a necessary and central
component of using Omnidex.
In an open systems environment, where a variety of operating systems
support a variety of data management systems, the environment catalog
provides a standard means of describing your data to OmniAccess applications,
including DBINSTAL and DATADEX. It is used to coordinate Omnidex with
the underlying database file layout by explicitly defining the database's
tables and columns to the Omnidex software.
The Environment Catalog source files are created using any system text
editor. Alternatively, for Oracle, Sybase, Informix, and TurboImage, the
Environment Catalogs can be automatically generated through the Omnidex
utility OAHELPER.
The Omnidex utility OACOMP is used to compile the Environment source
file into the Environment object file, also called the compiled Environment
Catalog file. If the original Environment source file is needed but unavailable,
the Omnidex utility OADECOMP will create a separate Environment source
file from an existing compiled Environment file.
OAHELPER
OAHELPER is used to
generate an initial prototype of an Omnidex
Environment Catalog Source against a target data base. A text editor
is then used to manually manipulate the generated source code to add desired
characteristics. OAHELPER works against any supported data base that contains
an internal schema such as Oracle, Sybase, Informix, TurboImage or an
ODBC accessible data base.
OAHELPER does not work against file structures such as POSIX flat files
or VMS RMS files that do not support an internal data schema.
You can also use a text editor to manually create a source file.
OADECOMP can also be
used to decompile an existing environment catalog into an editable source
file.
OACOMP
OACOMP compiles the environment
source file into the binary format, the Omnidex
Environment Catalog.
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