https://github.com/bezborodow/flask-migratepg

Simple SQL migration command for Flask and Psycopg 3.
https://github.com/bezborodow/flask-migratepg

database flask migrations postgresql psycopg sql-migration

Last synced: 17 days ago
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Simple SQL migration command for Flask and Psycopg 3.

• Host: GitHub
• URL: https://github.com/bezborodow/flask-migratepg
• Owner: bezborodow
• License: bsd-3-clause
• Created: 2023-06-05T15:05:23.000Z (over 1 year ago)
• Default Branch: master
• Last Pushed: 2024-03-04T06:22:45.000Z (8 months ago)
• Last Synced: 2024-10-01T02:49:48.619Z (about 1 month ago)
• Topics: database, flask, migrations, postgresql, psycopg, sql-migration
• Language: Python
• Homepage: https://pypi.org/project/flask-migratepg/
• Size: 32.2 KB
• Stars: 2
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# PostgreSQL Database Migrations for Flask with Psycopg

## Synopsis

`flask-migratepg` is a simple migrations tool for Flask and [Psycopg 3](https://www.psycopg.org/psycopg3/).

 1. Install and setup the Flask extension.

 2. Place SQL migrations under the subdirectory `database/migrations/`.

 3. Execute migrations with the command **`flask migrate execute`**.

## Installation

```

$ pip install flask-migratepg

```

Setup in application:

````python

from flask import Flask

from flask_migratepg import MigratePg

import os

app = Flask(__name__)

app.config.from_mapping(

    MIGRATIONS_PATH=os.path.abspath('database/migrations'),

    PSYCOPG_CONNINFO="dbname=example host=localhost user=example password=secret"

)

MigratePg(app)

````

## Usage

Create a new migration SQL file:

```

$ flask migrate --help

$ flask migrate new --help

$ flask migrate new migration_name

```

Then to run migrations:

```

$ flask migrate execute --help

$ flask migrate execute

```

This will run migrations in alphabetical order and track them in a migrations table.

If there is a failure, the transaction will be rolled back.

### Migration Files

Migrations are placed under `database/migrations/` as an **SQL** file

(that is, with an `.sql` filename extension.)

The recommended filename format is `YYMMDD_NNN_migration_name.sql`, for example, `20240219_001_add_table_accounts.sql`.

Statements are separated as per standard SQL conventions with a semicolon.

These are just plain-text standard SQL files. Comments (lines beginning with `-- `) will be ignored.