First try with db and sqlalchemy

app/__init__.py

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
+from config import app_config
+
+db = SQLAlchemy()
+def create_app(config_name):
+	app = Flask(__name__, instance_relative_config=True)
+	app.config.from_object(app_config[config_name])
+	app.config.from_pyfile('config.py')
+	db.init_app(app)
+	from app import models
+	migrate = Migrate(app, db)
+
+	@app.route('/')
+	def hello_world():
+		return 'Hello, World!'
+
+	return app

app/models.py

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+from app import db
+from datetime import datetime
+
+class Gas(db.Model):
+	"""
+	Create a gas table
+	"""
+
+	__tablename__ = 'gas'
+
+	id = db.Column(db.Integer, primary_key=True)
+	price = db.Column(db.Integer)
+	volume = db.Column(db.Integer)
+	milage = db.Column(db.Integer)
+	date = db.Column(db.DateTime, default=datetime.utcnow)
+	winterTyre = db.Column(db.Boolean)
+
+	def __ref__(self):
+		return '<Gas :{}>'.format(self.id)

config.py

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+# config.py
+
+class Config(object):
+    """
+    Common configurations
+    """
+
+    # Put any configurations here that are common across all environments
+
+class DevelopmentConfig(Config):
+    """
+    Development configurations
+    """
+
+    DEBUG = True
+    SQLALCHEMY_ECHO = True
+
+class ProductionConfig(Config):
+    """
+    Production configurations
+    """
+
+    DEBUG = False
+
+app_config = {
+	'development': DevelopmentConfig,
+	'production': ProductionConfig
+	}

instance/config.py

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+# instance/config.py
+
+SECRET_KEY = 'p9Bv<3Eid9%$i01'
+SQLALCHEMY_DATABASE_URI = 'mysql://bensin:bajsa@localhost/bensin'

migrations/README

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+Generic single-database configuration.

migrations/alembic.ini

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+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

migrations/env.py

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+from __future__ import with_statement
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+from logging.config import fileConfig
+import logging
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+logger = logging.getLogger('alembic.env')
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+from flask import current_app
+config.set_main_option('sqlalchemy.url',
+                       current_app.config.get('SQLALCHEMY_DATABASE_URI'))
+target_metadata = current_app.extensions['migrate'].db.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(url=url)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    # this callback is used to prevent an auto-migration from being generated
+    # when there are no changes to the schema
+    # reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, 'autogenerate', False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info('No changes in schema detected.')
+
+    engine = engine_from_config(config.get_section(config.config_ini_section),
+                                prefix='sqlalchemy.',
+                                poolclass=pool.NullPool)
+
+    connection = engine.connect()
+    context.configure(connection=connection,
+                      target_metadata=target_metadata,
+                      process_revision_directives=process_revision_directives,
+                      **current_app.extensions['migrate'].configure_args)
+
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

migrations/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

migrations/versions/46b4c05512b3_.py

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+"""empty message
+
+Revision ID: 46b4c05512b3
+Revises: 
+Create Date: 2017-08-22 13:25:11.487648
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '46b4c05512b3'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('gas',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('price', sa.Integer(), nullable=True),
+    sa.Column('volume', sa.Integer(), nullable=True),
+    sa.Column('milage', sa.Integer(), nullable=True),
+    sa.Column('date', sa.DateTime(), nullable=True),
+    sa.Column('winterTyre', sa.Boolean(), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('gas')
+    # ### end Alembic commands ###

run.py

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+# run.py
+
+import os
+
+from app import create_app
+
+config_name = os.getenv('FLASK_CONFIG')
+app = create_app(config_name)
+
+if __name__ == '__main__':
+    app.run()