sqla.py:
Код: Выделить всё
from sqlalchemy.orm import declarative_base
UnidadeBase = declarative_base()
ImplantacaoBase = declarative_base()
ChamadosBase = declarative_base()
Код: Выделить всё
from logging.config import fileConfig
from sqlalchemy import engine_from_config
from sqlalchemy import pool
from alembic import context
from databasemgmt.sqla_base import UnidadeBase, ImplantacaoBase, ChamadosBase
import os
from dotenv import load_dotenv
load_dotenv()
# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config
segments = {
"Unidade": {
"metadata": UnidadeBase.metadata,
"db_url": os.getenv("DB_UNIDADE_URL"),
},
"Implantacao": {
"metadata": ImplantacaoBase.metadata,
"db_url": os.getenv("DB_IMPLANTACAO_URL"),
},
"Chamados": {
"metadata": ChamadosBase.metadata,
"db_url": os.getenv("DB_CHAMADOS_URL"),
}
}
# Interpret the config file for Python logging.
# This line sets up loggers basically.
if config.config_file_name is not None:
fileConfig(config.config_file_name)
# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.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() -> None:
"""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.
"""
for segment_name, segment in segments.items():
url = segment["db_url"]
metadata = segment["metadata"]
context.configure(
url=url,
target_metadata=metadata,
literal_binds=True,
dialect_opts={"paramstyle": "named"},
)
with context.begin_transaction():
context.run_migrations()
def run_migrations_online() -> None:
"""Run migrations in 'online' mode.
In this scenario we need to create an Engine
and associate a connection with the context.
"""
for segment_name, segment in segments.items():
url = segment["db_url"]
metadata = segment["metadata"]
connectable = engine_from_config(
{"sqlalchemy.url": url},
prefix="sqlalchemy.",
poolclass=pool.NullPool,
)
with connectable.connect() as connection:
context.configure(connection=connection, target_metadata=metadata)
with context.begin_transaction():
context.run_migrations()
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()
Существует ли альтернативный подход к обработке миграции для нескольких баз данных или Alembic не поддерживает эту функцию?
Подробнее здесь: https://stackoverflow.com/questions/792 ... l-database
Мобильная версия