Brad Lucas

Up Early

3, 4, 5

Train

Grand Central at 6 am

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Making SQL More Like Datomic With Clojure

Clojure NYC had another great talk last night with Michael Gaare of Ladders introducing his library sqlium. Michael has taken his experience with Datomic and has created a DSL for querying SQL databases with a Dataomic-like flavor.

The source for the library was just put up on GitHub last night at https://github.com/TheLadders/sqlium. It will be interesting to see how the library does as others start using it.

As a next step, it would be good if the source Michael demonstrated last night which used the MusicBrainz data set was published somewhere for review as well.

Background

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Some Rules

• No releases after hours unless previously negotiated
• Reponsible parties need to be present during the release
  • ie, Developer and Ops
• Different systems have different release requirements
  • All have dependencies
  • Need to know roll back procedure
  • And, how to know if a roll back is necessary
• The release may have ‘other‘ tasks. These should be documented and have been previously tested
  • Any env settings, configuration setting changes
  • Database changes
  • Systems that need to be stopped and started as part of the release
  • The ‘recipe‘ should be published
  • The ‘recipe‘ should have been followed in a ‘testing/staging‘ environment

Source Control

• Use Git Flow
• Releases are from release/VERSION_NUMBER branches
• All code should be reviewed if necessary and merged to ‘develop‘ prior to release
  • ie, releases are branched from a stable state
• Releases are numbered with a x.x.x format
  • Each release should increment intelligently
  • If any confusion get it sorted out ahead of time
• DevOps will deploy the branch unless previously negotiated

Checklist

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Overview

While cleaning out some old Gists I found a function I wrote six years ago using Clojure's juxt function.

The gist is here:

https://gist.github.com/bradlucas/1233763

To save a click I'll put the function here after fixing the embarassing typo in the comment.

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Overview

A common workflow when developing a Clojure project is to leverage one or more libraries written by others. When found, you'll review the main documentation page for a library and learn the information you'll need to add to your project.clj file's :dependencies vector so Leiningen can find and load that library. These libraries will typically come from Clojars but can also be loaded from Maven Central.

Behind the scenes, when you build your project, you should know that your configured libraries will be installed in your local Maven repository. Look inside of the .m2 directory off of your home directory.

So far so good. This will be all you need if you are good using these libraries without modification.

The question does arise though when you want to try changing one of these libraries. How can you set things up to allow this is the question.

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