You can look at all the open source databases that are out there. You can also look at things like FoundationDb and their SQL layer. It shows how you can build

You can look at all the open source databases that are out there. You can also look at things like FoundationDb and their SQL layer. It shows how you can build a relational api on top of a NoSql db with transactions. I think that will be open source on GitHub https://github.com/FoundationDB/sql-layer https://github.com/FoundationDB/sql-layer.