API Reference

Appendix G. Application Migration Considerations

This section describes issues that should be considered before migrating an application to Version 5.

There are four possible operating scenarios:

1. Running pre-Version 5 applications against databases that have not been migrated
2. Running pre-Version 5 applications against migrated databases
3. Updating applications with Version 5 APIs
4. Running Version 5 applications against migrated databases.

The first and the fourth are consistent operating environments that do not require qualification.

The second, in which only the databases have been migrated, should work without changes to any application, because back-level applications are supported. However, as with any new version, a small number of incompatibilities can occur, and these are described in the Administration Guide.

For the third scenario, in which applications are to be updated with Version 5 APIs, the following points should be considered:

• All pre-Version 5 APIs that have been discontinued in Version 5 are still defined in the Version 5 header files, so that older applications will compile and link with Version 5 headers.
• Discontinued APIs should be removed from applications as soon as possible to enable these applications to take full advantage of the new functions available in Version 5, and to position the applications for future enhancements.
• The names of the APIs listed below have changed because of new functionality in Version 5. Users should scan for these names in their application source code to identify the changes required following Version 5 migration of the application.

  APIs that are not listed do not require changes following migration of an application.

  Note that an application may contain the generic version of an API call, depending on the application programming language being used. In all cases, the generic version of the API name is identical to the C version of the name, with the exception that the fourth character is always g.

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