![]() It allows us to access relational databases from Elixir applications without having to. ] ) ] ] )įor more ideas and inspiration also check out this amazing blog post “I can do all things through PostgreSQL” by Todd Resudek (if you haven’t yet). Ecto is a database wrapper library for the Elixir programming language. With formatted with mix format elixir code could look like: import Ecto.Query from ( m in "movies", select : Īwesome! Now this macro can also be used in combination with other functions and macros from Ecto DSL, for example with update: from ( m in "movies", update :. SELECT title,ĬASE WHEN length > 40 THEN 'feature film' The Ecto.Query module provides us with the Query DSL which we can use to write queries to retrieve data from the applications repository. title | lengthĪccording to those organizations, motion pictures with running time less than 40 minutes are considered short films otherwise it can be considered as feature-length film. We have a table movies and, say, we would like to query the titles and types of movies based on the length requirements set by American Film Institute and British Film Institute. ![]() With Ecto we’re able to create migrations, define schemas, insert and update records, and query them. The basic SQL syntax looks like: CASE WHEN condition THEN result On Ecto 2.0 (beta) with Postgres, you can use () (current docs, 2.0-beta2 docs) to execute arbitrary SQL in addition to a list of the. Ecto is an official Elixir project providing a database wrapper and integrated query language. We were used to achieve this by restarting Postgrex but that would restart the connections which in turn triggers a race condition as seen on elixir-ecto119. SQL CASE is one of those expressions that’s not available by default in Ecto so let’s see how we could implement it: Whenever a migration adds an extension, we have to restart connections so they rebootstrap. It provides us with tools for language integrated query and if a query is not possible to represent using standard Ecto’s syntax, there is /1 to send the expression to the DB. ![]() TL DR jump straight to the implementation of specialized variant of sql_case/2 macro.Įcto is one of the best things happened to elixir. ![]()
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