refactoring Schema to expose functions for database updates

[mohs8421]

This PR aims to expose functionality already available within a Schema to make it easier to update databases after changes.

Changes

• Schema now has get_column_def() to make the creation of TableAlterStatement easier in migrations

[tyt2y3]

Good to have this feature

[billy1624]

Hey @mohs8421, thanks for contributing!! Seems this PR is still in progress and there are more internal functions to be extracted and made public? Let me know when it's ready :)

[mohs8421]

Hey @mohs8421, thanks for contributing!! Seems this PR is still in progress and there are more internal functions to be extracted and made public? Let me know when it's ready :)

yes, I want to extract the part about foreign keys as well, it should be almost straight forward too, although the confusion about TableForeignKey and ForeignKeyCreateStatement is a little bit anoying, since the later is missing a From<> implementation, I have to implement the creation of that one to get to the first one. Currently working on some other code, so it unfortunately has to wait a little bit.

[billy1624]

Hey @mohs8421, looks good! I've a small refactoring mohs8421#1

[billy1624]

Opppps... sorry, I forgot to set the name of the target table
mohs8421#2

[tyt2y3]

✅