Once you run the script, you can generate an ERS snapshot. This is a "manual" operation and thus can't be used when you release your Docker image. lastly, you can also use the pgAdmin interface.You then use the DBML cli to convert the SQL script into DBML code: You can do this programmatically with for example a small cleaning task. We need to clean the logs to extract only the SQL commands. We set up the PostgreSQL database, code the migrations with Ecto, run them and save the logs to get the SQL script. a Character can have many Actors per Movie through contracts,.an Actor has a unique Character per Movie through a unique Contract for a certain amount,.a Movie has one Producer, and a Producer can have many movies,.The database should capture the following relations: We take four models/schemas talking about movies, actors, producers and characters. The diagram below shows where all these tools can be used. You can generate the default DOT format or PUML code or DBML code. projects tailored for the framework such as ecto_erd.Also to mention the free Sequel Ace for MySQL/MariaDB. You can learn how to use it with this video. You can design a database with it, and conversely, generate an ERD snapshot from an existing database. the build-in ER tool for PostgreSQL included in pgAdmin.To visualise the diagram, you can use directly plantuml or use an IDE extension (such as PlantUML in VScode, press opt-D) or use the official on-line drawer. The "plantuml" code for ERD is easily understandable: Just pass the database url (the db is set by a flag):Įnter fullscreen mode Exit fullscreen mode the node package pg-to-dbml connects to your Postgres database and produces DBML code from it.An example of DBML code where a table is built, with foreign keys, composite indexes and relations 1-n ( DBML: To SQL) and vice-versa ( >DBML:From SQL). While DOT and PLANTUML formats are multi-purpose drawing utilities, DBML is an easy-to-read DSL focused on tables, to design the data structure in code and draw an ER diagram from it. You have three main formats to draw ER diagrams: DOT, UML and DBML. We gathered notes on a few tools to interact with diagrams as code and show where they can be used. Even if experienced teams might not integrate such diagrams in the design pipeline, almost every framework lets you take an ERD snapshot of your data structure. You may also want to use ER diagrams for modelling a database as you may find it easier or faster to reason or want to communicate with them. When you design a relational database, you code two entities, migration files and data mapping files.
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