How to refer to a variable package name

Hi All,
I'm revising my PL/SQL packages, e.g. Pkg_Name_01, Pkg_Name_02 ... So if refering to a function within such a revised package, I need a method to get the version string from a global variable and then call the function via Pkg_Name_<version_string>.Function_Name (where version_string is the value of a global variable).
Can anybody tell me if this is possible and if so how to achieve this?
Thanks & Regards
Carolin

Carolin wrote:
But as I have a lot of references to revised packages in my code it's a bit error-prone with each new revision - so I thougt there would be a better/simpler solution... How would the approach with dynamic sql look like?<i>Dynamic SQL is Evil ™</i> - okay not always. Judged from what is posted here, a full 1% of all dynamic SQL is not evil.
The simpler solution is to use scope to enable your code to reference the appropriate version. In Oracle, there is unfortunately/fortunately no session scope in this regard. Resolution scope is either local (schema) or public.
For example, the code library (schema <i>CODELIB</i>) has several versions of the FooInterface package, e.g.
- CODELIB.FooInterface_v100
- CODELIB.FooInterface_v110
- CODELIB.FooInterface_v200
Your schema, APP123 needs to use version 1.0 of this interface. A local schema synonym provides name resolution scope:
create or replace synonym FooInterface for CODELIB.FooInterface_v110
Another schema, HRDEMO, needs to use the latest version of the interface. Thus, as that schema:
create or replace synonym FooInterface for CODELIB.FooInterface_v200
Assuming FooInterface is a well behaved interface, you can at any time upgrade your schema to using a newer version of the interface, by recreating your schema synonym for the interface. And no code changes will be needed to your application code to keep it working.
If your versioning needs are finer grained at this and at session level (e.g. different sessions in schema APP123 needs to use different versions of the <i>FooInterface</i>), then you have a serious implementation and versioning problem. Ones that cannot and should not be solved technically (using hacks like dynamic SQL). But ones that need to be addressed via change control and s/w management - in other words, you then have a broken SDLC (Software Development Life Cycle) that needs to be fixed.

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