Migration Examples

The Migration project shows several examples of migrations and migration blocks.

The purpose of this example is to provide a more in depth view of certain problems and pitfalls users might face when migrations get more complex and the number of versions increases.

How to use the example

You can build and run the project as is. Migrations from all prior version to the current version will be checked:

• v0 -> v5
• v1 -> v5
• v2 -> v5
• v3 -> v5
• v4 -> v5

The files to look at are located in the Examples folder. Every file contains an extract of everything necessary for this version (schema version, objects, migration and migration checks).

If you want to compare older versions among each other (i.e. v2 -> v3) you can do so by enabling the schema version, for example:

• Deactivate version 5 by setting #define SCHEMA_VERSION_5 1 to #define SCHEMA_VERSION_5 0 in Example_v5.h.
• Activate version 3 by seting #define SCHEMA_VERSION_3 0 to #define SCHEMA_VERSION_3 1 in Example_v3.h.