Current File : //proc/227033/root/opt/alt/python27/lib/python2.7/site-packages/alembic/autogenerate/api.pyc
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Compare a database schema to that given in a
:class:`~sqlalchemy.schema.MetaData` instance.
The database connection is presented in the context
of a :class:`.MigrationContext` object, which
provides database connectivity as well as optional
comparison functions to use for datatypes and
server defaults - see the "autogenerate" arguments
at :meth:`.EnvironmentContext.configure`
for details on these.
The return format is a list of "diff" directives,
each representing individual differences::
from alembic.migration import MigrationContext
from alembic.autogenerate import compare_metadata
from sqlalchemy.schema import SchemaItem
from sqlalchemy.types import TypeEngine
from sqlalchemy import (create_engine, MetaData, Column,
Integer, String, Table)
import pprint
engine = create_engine("sqlite://")
engine.execute('''
create table foo (
id integer not null primary key,
old_data varchar,
x integer
)''')
engine.execute('''
create table bar (
data varchar
)''')
metadata = MetaData()
Table('foo', metadata,
Column('id', Integer, primary_key=True),
Column('data', Integer),
Column('x', Integer, nullable=False)
)
Table('bat', metadata,
Column('info', String)
)
mc = MigrationContext.configure(engine.connect())
diff = compare_metadata(mc, metadata)
pprint.pprint(diff, indent=2, width=20)
Output::
[ ( 'add_table',
Table('bat', MetaData(bind=None),
Column('info', String(), table=<bat>), schema=None)),
( 'remove_table',
Table(u'bar', MetaData(bind=None),
Column(u'data', VARCHAR(), table=<bar>), schema=None)),
( 'add_column',
None,
'foo',
Column('data', Integer(), table=<foo>)),
( 'remove_column',
None,
'foo',
Column(u'old_data', VARCHAR(), table=None)),
[ ( 'modify_nullable',
None,
'foo',
u'x',
{ 'existing_server_default': None,
'existing_type': INTEGER()},
True,
False)]]
:param context: a :class:`.MigrationContext`
instance.
:param metadata: a :class:`~sqlalchemy.schema.MetaData`
instance.
.. seealso::
:func:`.produce_migrations` - produces a :class:`.MigrationScript`
structure based on metadata comparison.
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This function does essentially what :func:`.compare_metadata` does,
but then runs the resulting list of diffs to produce the full
:class:`.MigrationScript` object. For an example of what this looks like,
see the example in :ref:`customizing_revision`.
.. versionadded:: 0.8.0
.. seealso::
:func:`.compare_metadata` - returns more fundamental "diff"
data from comparing a schema.
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