Platform used for Quartz, Session, Integration, and Batch schema initialization cannot be configured

[wilkinsona]

At the moment, it's only possible to derive the platform from the DataSource. This is a bit limiting. For example it means that the default schema location cannot be used with a database that isn't known to DatabaseDriver. The problem can be avoiding by configuring the schema location, for example by replacing the default location of "classpath:org/springframework/integration/jdbc/schema-@@platform@@.sql" with "classpath:org/springframework/integration/jdbc/schema-sybase.sql" but it would be easier if just the platform could be configured without having to worry about the actually location of the schema scripts.

[snicoll]

While working on this, I've realized that things have heavily changed in 2.6.x and I am not sure how to handle it there yet. Handling a shortcut method in PlatformPlaceholderDatabaseDriverResolver feels a bit odd as we're not reusing any of the DatabaseDriver mapping stuff. Not doing it means we'd have to copy/paste the replacement in 4 places.

I guess the name of the class as it is makes it hard to expand the scope.