Load MySQL comments into TableSchema

[michaelarnauts]

Q	A
Is bugfix?	yes/no
New feature?	yes
Breaks BC?	no
Tests pass?	yes
Fixed issues	#13154 (partially)

[samdark]

Need @since 2.0.12.

[samdark]

Need @since 2.0.12.

[samdark]

How about other database engines?

[michaelarnauts]

I only have a MySQL server

[michaelarnauts]

I've added the @since 2.0.12 to the phpdoc.

[samdark]

Great. We can't really release it for MySQL only so will see if we'll have enough time to implement all other DB engines support before 2.0.12...

[michaelarnauts]

• mssql uses a strange way to store comments, by using "extended properties", not sure if this is considered a standard practice to do so (http://stackoverflow.com/questions/378700/is-it-possible-to-add-a-description-comment-to-a-table-in-microsoft-sql-2000)
• postgres seems to provide a decent way to do this (http://stackoverflow.com/questions/5664094/getting-list-of-table-comments-in-postgresql)

I'm not sure about other databases.

[samdark]

Oracle: http://stackoverflow.com/questions/16567129/how-to-get-table-comments-via-sql-in-oracle

[samdark]

SQLite seems not to support comments at all.

[yii-bot]

Thank you for putting effort in the improvement of the Yii framework.
We have reviewed your pull request.

In order for the framework and your solution to remain stable in the future, we have a unit test requirement in place. Therefore we can only accept your pull request if it is covered by unit tests.

Could you add these please?

Thanks!

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This is an automated comment, triggered by adding the label pr:request for unit tests.

[samdark]

Won't make it into 2.0.