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Database Migrations in AdonisJs

Here, we are going to learn about the database migrations in AdonisJs, what is migration script, etc?
Submitted by Radib Kar, on January 11, 2021

In our AdonisJs series, we have already learnt how to get started and what the structure details of the boilerplate created are? The very first step towards learning to develop a backend with Adonis.js is learning what database migrations are.

This tutorial is focused to discuss details on database migrations.

Since we have already created the boilerplate, we have default migration scripts created already. In the last tutorial, I also discussed the directory structure and we found that by default we have two migration scripts created.

Let's now discuss this in detail.

AdonisJs | Database Migrations (1)

AdonisJs | Database Migrations (2)

What is a migration script?

A migration script is a special feature in adonis that helps us to run DDL statements like creating, dropping tables under a schema.

So if you have a created schema, you don't need to create or drop tables manually when required.

Now, first come to the .env file where you will see some environment variables listed regarding database setups like below:

AdonisJs | Database Migrations (3)

First, change the DB_CONNECTION from SQLite to MySQL(As we will use MySQL).

This is what created by default. DB_HOST & DB_PORT should be same as your MySQL workbench set up.

DB_USER is root by default

DB_PASSWORD = the password you set for your workbench

DB_DATABASE = the schema name which is adonis by default. You have to create a schema with the same name in your MySQL workbench

This is the setup required before getting started with adonis. Below is the .env set up for me(OOPs!, I  exposed my DB password :( )

AdonisJs | Database Migrations (4)

Okay so, we are done with the setup.

Let's now review migration-related few commands.

For that hit the below command in your terminal.

Adonis -help

As output, you will find a detailed list of commands & there you will find migration-related commands too like below.

AdonisJs | Database Migrations (5)

So, I won't repeat each command and what it does as you can already see that.

But first, we will use the command

adonis migration:run

This command runs all the pending migrations. Since we have all migrations pending, it will create the tables for us. Before going in deep into the migration scripts, let's just run this command.

If you successfully run this command you should see the following:

AdonisJs | Database Migrations (6)

Otherwise, you might see the following errors,

1.

AdonisJs | Database Migrations (7)

This is saying that your MySQL module is not installed. So to install the MySQL module successfully, use the below command:

npm install mysql -save

It will install the MySQL module locally which means if you create another new application, again you have to install the module there.

2.

AdonisJs | Database Migrations (8)

This is because you haven't created the schema which is mentioned in the .env file(DB_DATABASE). So, please create a schema with the same name with help of MySQL workbench.

Once your migrations have been run successfully, open the MySQL workbench & you should see the two tables created users & tokens like below:

AdonisJs | Database Migrations (9)

Congrats, you have successfully run the default migration scripts. This tutorial ends here, but obviously, migrations not. Please follow our next article to learn more about adonis migrations & create your migration script.

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