SQL Migration for Go Lang
Usage Example for the SQL migration tool in Go Lang
This project uses the Migrate tool. It’s a tool written in Go that able to run SQL migrations for multiple databases.
Migrate link Migrate.
This works by managing a table (schema_migrations) allowing you to check which migrations have been applied.
Starting the Postgres by Docker/Docker-Compose
For better execution of this project, you can run the postgres container with docker and docker-compose. Use the following command in root directory:
docker-compose up -d
Migration CLI Instalations
To install the Migrate CLI use:
go install -tags 'postgres' github.com/golang-migrate/migrate/v4/cmd/migrate@latest
With the Migrate CLI installed, you can use it to create the SQL migration files as the folow:
migrate create -ext sql -dir db/migration -seq init_schema
This code creates the files:
The files with suffix up is used to apply changes and with suffix down is used for change reversions
Running SQL Migrations
Use the parameter up or down to apply ou revert SQL changes.
migrate -path ./src/db/migrations -database "postgresql://postgres:postgres@localhost:5432/postgres?sslmode=disable&search_path=db_schema" -verbose up
Running SQL Migrations into Go projects
In this example was used the Go 1.17 version and the packages:
To run migrations in Go lang look to migrations.go file that execute the up migration.
The call database.RunMigrations() in main.go allow to apply migrations automatically in boot application.