Add MySQL implementation

[steventwheeler]

References #802

[lightbend-cla-validator]

Hi @steventwheeler,

Thank you for your contribution! We really value the time you've taken to put this together.

Before we proceed with reviewing this pull request, please sign the Lightbend Contributors License Agreement:

http://www.lightbend.com/contribute/cla

[steventwheeler]

I'm working on getting the CLA approved on my end but this change appears to resolve the issues I was seeing in my application.

[lightbend-cla-validator]

Hi @steventwheeler,

Thank you for your contribution! We really value the time you've taken to put this together.

Before we proceed with reviewing this pull request, please sign the Lightbend Contributors License Agreement:

http://www.lightbend.com/contribute/cla

[steventwheeler]

My employer has signed the CLA.

[octonato]

My employer has signed the CLA.

Thanks for your contribution @steventwheeler.

However, for the CLA, the one that contributed needs to sign. The CLA checker will verify if user @steventwheeler has signed.

[octonato]

My employer has signed the CLA.

Thanks for your contribution @steventwheeler.

However, for the CLA, the one that contributed needs to sign. The CLA checker will verify if user @steventwheeler has signed.

So, what I'm saying is, if you have their authorization to contribute code to Akka, then you can sign the CLA and the code can be accepted by Lightbend.

[steventwheeler]

My employer has signed the CLA.

Thanks for your contribution @steventwheeler.
However, for the CLA, the one that contributed needs to sign. The CLA checker will verify if user @steventwheeler has signed.

So, what I'm saying is, if you have their authorization to contribute code to Akka, then you can sign the CLA and the code can be accepted by Lightbend.

I have signed it as well.

[steventwheeler]

Or at least I linked my GitHub account to your site and filled in the form. Is there another step that is required?

[johanandren]

I manually verified there is an entry in the CLA database 👍

[johanandren]

LGTM

[octonato]

closing and reopen to re-trigger the CLA check

[octonato]

LGTM
Thanks @steventwheeler for the contribution.

[johanandren]

Hey @steventwheeler, unfortunately we had an issue with the CI setup and didn't notice that the MySQLScalaJdbcDurableStateChangesByTagTest doesn't pass from this PR, I've disabled it in #806 where I fix the CI jobs, would be great if you could take a look, seems like the MySQLSequenceNextValUpdater doesn't work as expected.

[Roiocam]

Hey @steventwheeler, unfortunately we had an issue with the CI setup and didn't notice that the MySQLScalaJdbcDurableStateChangesByTagTest doesn't pass from this PR, I've disabled it in #806 where I fix the CI jobs, would be great if you could take a look, seems like the MySQLSequenceNextValUpdater doesn't work as expected.

@johanandren Seems like MySQL can only increase the sequence by inserting and from the database itself. I will say the Oracle and SQLServer will be more easy to implement. Need some magic tricks that make MySQL work.