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📁 ..	-	2026-01-20 12:58
📄 README Rudimentary multi-database configuration. Multi-DB isn't vastly different from generic. The primary difference is that it will run the migrations N times (depending on how many databases you have configured), providing one engine name and associated context for each run. That engine name will then allow the migration to restrict what runs within it to just the appropriate migrations for that engine. You can see this behavior within the mako template. In the provided configuration, you'll need to have `databases` provided in alembic's config, and an `sqlalchemy.url` provided for each engine name.	606 B	2026-01-20 12:58
📁 __pycache__	-	2026-03-21 15:45
📄 alembic.ini.mako # a multi-database configuration. [alembic] # path to migration scripts script_location = ${script_location} # template used to generate migration file names; The default value is %%(rev)s_%%(slug)s # Uncomment the line below if you want the files to be prepended with date and time # see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file # for all available tokens # file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s # sys.path path, will be prepended to sys.path if present. # defaults to the current working directory. prepend_sys_path = . # timezone to use when rendering the date within the migration file # as well as the filename. # If specified, requires the python-dateutil library that can be # installed by adding `alembic[tz]` to the pip requirements # string value is passed to dateutil.tz.gettz() # leave blank for localtime # timezone = # max length of characters to apply to the # "slug" field # truncate_slug_length = 40 # set to 'true' to run the environment during # the 'revision' command, regardless of autogenerate # revision_environment = false # set to 'true' to allow .pyc and .pyo files without # a source .py file to be detected as revisions in the # versions/ directory # sourceless = false # version location specification; This defaults # to ${script_location}/versions. When using multiple version # directories, initial revisions must be specified with --version-path. # The path separator used here should be the separator specified by "version_path_separator" below. # version_locations = %(here)s/bar:%(here)s/bat:${script_location}/versions # version path separator; As mentioned above, this is the character used to split # version_locations. The default within new alembic.ini files is "os", which uses os.pathsep. # If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas. # Valid values for version_path_separator are: # # version_path_separator = : # version_path_separator = ; # version_path_separator = space version_path_separator = os # Use os.pathsep. Default configuration used for new projects. # set to 'true' to search source files recursively # in each "version_locations" directory # new in Alembic version 1.10 # recursive_version_locations = false # the output encoding used when revision files # are written from script.py.mako # output_encoding = utf-8 databases = engine1, engine2 [engine1] sqlalchemy.url = driver://user:pass@localhost/dbname [engine2] sqlalchemy.url = driver://user:pass@localhost/dbname2 [post_write_hooks] # post_write_hooks defines scripts or Python functions that are run # on newly generated revision scripts. See the documentation for further # detail and examples # format using "black" - use the console_scripts runner, against the "black" entrypoint # hooks = black # black.type = console_scripts # black.entrypoint = black # black.options = -l 79 REVISION_SCRIPT_FILENAME # 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	3.42 KB	2026-01-20 12:58
📄 env.py import logging from logging.config import fileConfig import re from sqlalchemy import engine_from_config from sqlalchemy import pool from alembic import context USE_TWOPHASE = False # 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. if config.config_file_name is not None: fileConfig(config.config_file_name) logger = logging.getLogger("alembic.env") # gather section names referring to different # databases. These are named "engine1", "engine2" # in the sample .ini file. db_names = config.get_main_option("databases", "") # add your model's MetaData objects here # for 'autogenerate' support. These must be set # up to hold just those tables targeting a # particular database. table.tometadata() may be # helpful here in case a "copy" of # a MetaData is needed. # from myapp import mymodel # target_metadata = { # 'engine1':mymodel.metadata1, # 'engine2':mymodel.metadata2 # } target_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 the --sql use case, run migrations for each URL into # individual files. engines = {} for name in re.split(r",\s", db_names): engines[name] = rec = {} rec["url"] = context.config.get_section_option(name, "sqlalchemy.url") for name, rec in engines.items(): logger.info("Migrating database %s" % name) file_ = "%s.sql" % name logger.info("Writing output to %s" % file_) with open(file_, "w") as buffer: context.configure( url=rec["url"], output_buffer=buffer, target_metadata=target_metadata.get(name), literal_binds=True, dialect_opts={"paramstyle": "named"}, ) with context.begin_transaction(): context.run_migrations(engine_name=name) 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 the direct-to-DB use case, start a transaction on all # engines, then run all migrations, then commit all transactions. engines = {} for name in re.split(r",\s", db_names): engines[name] = rec = {} rec["engine"] = engine_from_config( context.config.get_section(name, {}), prefix="sqlalchemy.", poolclass=pool.NullPool, ) for name, rec in engines.items(): engine = rec["engine"] rec["connection"] = conn = engine.connect() if USE_TWOPHASE: rec["transaction"] = conn.begin_twophase() else: rec["transaction"] = conn.begin() try: for name, rec in engines.items(): logger.info("Migrating database %s" % name) context.configure( connection=rec["connection"], upgrade_token="%s_upgrades" % name, downgrade_token="%s_downgrades" % name, target_metadata=target_metadata.get(name), ) context.run_migrations(engine_name=name) if USE_TWOPHASE: for rec in engines.values(): rec["transaction"].prepare() for rec in engines.values(): rec["transaction"].commit() except: for rec in engines.values(): rec["transaction"].rollback() raise finally: for rec in engines.values(): rec["connection"].close() if context.is_offline_mode(): run_migrations_offline() else: run_migrations_online()	4.13 KB	2026-01-20 12:58
📄 script.py.mako <%! import re %>"""${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 = ${repr(depends_on)} def upgrade(engine_name: str) -> None: globals()["upgrade_%s" % engine_name]() def downgrade(engine_name: str) -> None: globals()["downgrade_%s" % engine_name]() <% db_names = config.get_main_option("databases") %> ## generate an "upgrade_<xyz>() / downgrade_<xyz>()" function ## for each database name in the ini file. % for db_name in re.split(r',\s*', db_names): def upgrade_${db_name}() -> None: ${context.get("%s_upgrades" % db_name, "pass")} def downgrade_${db_name}() -> None: ${context.get("%s_downgrades" % db_name, "pass")} % endfor	965 B	2026-01-20 12:58

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