844 lines
30 KiB
Python
844 lines
30 KiB
Python
# engine/reflection.py
|
|
# Copyright (C) 2005-2017 the SQLAlchemy authors and contributors
|
|
# <see AUTHORS file>
|
|
#
|
|
# This module is part of SQLAlchemy and is released under
|
|
# the MIT License: http://www.opensource.org/licenses/mit-license.php
|
|
|
|
"""Provides an abstraction for obtaining database schema information.
|
|
|
|
Usage Notes:
|
|
|
|
Here are some general conventions when accessing the low level inspector
|
|
methods such as get_table_names, get_columns, etc.
|
|
|
|
1. Inspector methods return lists of dicts in most cases for the following
|
|
reasons:
|
|
|
|
* They're both standard types that can be serialized.
|
|
* Using a dict instead of a tuple allows easy expansion of attributes.
|
|
* Using a list for the outer structure maintains order and is easy to work
|
|
with (e.g. list comprehension [d['name'] for d in cols]).
|
|
|
|
2. Records that contain a name, such as the column name in a column record
|
|
use the key 'name'. So for most return values, each record will have a
|
|
'name' attribute..
|
|
"""
|
|
|
|
from .. import exc, sql
|
|
from ..sql import schema as sa_schema
|
|
from .. import util
|
|
from ..sql.type_api import TypeEngine
|
|
from ..util import deprecated
|
|
from ..util import topological
|
|
from .. import inspection
|
|
from .base import Connectable
|
|
|
|
|
|
@util.decorator
|
|
def cache(fn, self, con, *args, **kw):
|
|
info_cache = kw.get('info_cache', None)
|
|
if info_cache is None:
|
|
return fn(self, con, *args, **kw)
|
|
key = (
|
|
fn.__name__,
|
|
tuple(a for a in args if isinstance(a, util.string_types)),
|
|
tuple((k, v) for k, v in kw.items() if
|
|
isinstance(v,
|
|
util.string_types + util.int_types + (float, )
|
|
)
|
|
)
|
|
)
|
|
ret = info_cache.get(key)
|
|
if ret is None:
|
|
ret = fn(self, con, *args, **kw)
|
|
info_cache[key] = ret
|
|
return ret
|
|
|
|
|
|
class Inspector(object):
|
|
"""Performs database schema inspection.
|
|
|
|
The Inspector acts as a proxy to the reflection methods of the
|
|
:class:`~sqlalchemy.engine.interfaces.Dialect`, providing a
|
|
consistent interface as well as caching support for previously
|
|
fetched metadata.
|
|
|
|
A :class:`.Inspector` object is usually created via the
|
|
:func:`.inspect` function::
|
|
|
|
from sqlalchemy import inspect, create_engine
|
|
engine = create_engine('...')
|
|
insp = inspect(engine)
|
|
|
|
The inspection method above is equivalent to using the
|
|
:meth:`.Inspector.from_engine` method, i.e.::
|
|
|
|
engine = create_engine('...')
|
|
insp = Inspector.from_engine(engine)
|
|
|
|
Where above, the :class:`~sqlalchemy.engine.interfaces.Dialect` may opt
|
|
to return an :class:`.Inspector` subclass that provides additional
|
|
methods specific to the dialect's target database.
|
|
|
|
"""
|
|
|
|
def __init__(self, bind):
|
|
"""Initialize a new :class:`.Inspector`.
|
|
|
|
:param bind: a :class:`~sqlalchemy.engine.Connectable`,
|
|
which is typically an instance of
|
|
:class:`~sqlalchemy.engine.Engine` or
|
|
:class:`~sqlalchemy.engine.Connection`.
|
|
|
|
For a dialect-specific instance of :class:`.Inspector`, see
|
|
:meth:`.Inspector.from_engine`
|
|
|
|
"""
|
|
# this might not be a connection, it could be an engine.
|
|
self.bind = bind
|
|
|
|
# set the engine
|
|
if hasattr(bind, 'engine'):
|
|
self.engine = bind.engine
|
|
else:
|
|
self.engine = bind
|
|
|
|
if self.engine is bind:
|
|
# if engine, ensure initialized
|
|
bind.connect().close()
|
|
|
|
self.dialect = self.engine.dialect
|
|
self.info_cache = {}
|
|
|
|
@classmethod
|
|
def from_engine(cls, bind):
|
|
"""Construct a new dialect-specific Inspector object from the given
|
|
engine or connection.
|
|
|
|
:param bind: a :class:`~sqlalchemy.engine.Connectable`,
|
|
which is typically an instance of
|
|
:class:`~sqlalchemy.engine.Engine` or
|
|
:class:`~sqlalchemy.engine.Connection`.
|
|
|
|
This method differs from direct a direct constructor call of
|
|
:class:`.Inspector` in that the
|
|
:class:`~sqlalchemy.engine.interfaces.Dialect` is given a chance to
|
|
provide a dialect-specific :class:`.Inspector` instance, which may
|
|
provide additional methods.
|
|
|
|
See the example at :class:`.Inspector`.
|
|
|
|
"""
|
|
if hasattr(bind.dialect, 'inspector'):
|
|
return bind.dialect.inspector(bind)
|
|
return Inspector(bind)
|
|
|
|
@inspection._inspects(Connectable)
|
|
def _insp(bind):
|
|
return Inspector.from_engine(bind)
|
|
|
|
@property
|
|
def default_schema_name(self):
|
|
"""Return the default schema name presented by the dialect
|
|
for the current engine's database user.
|
|
|
|
E.g. this is typically ``public`` for PostgreSQL and ``dbo``
|
|
for SQL Server.
|
|
|
|
"""
|
|
return self.dialect.default_schema_name
|
|
|
|
def get_schema_names(self):
|
|
"""Return all schema names.
|
|
"""
|
|
|
|
if hasattr(self.dialect, 'get_schema_names'):
|
|
return self.dialect.get_schema_names(self.bind,
|
|
info_cache=self.info_cache)
|
|
return []
|
|
|
|
def get_table_names(self, schema=None, order_by=None):
|
|
"""Return all table names in referred to within a particular schema.
|
|
|
|
The names are expected to be real tables only, not views.
|
|
Views are instead returned using the :meth:`.Inspector.get_view_names`
|
|
method.
|
|
|
|
|
|
:param schema: Schema name. If ``schema`` is left at ``None``, the
|
|
database's default schema is
|
|
used, else the named schema is searched. If the database does not
|
|
support named schemas, behavior is undefined if ``schema`` is not
|
|
passed as ``None``. For special quoting, use :class:`.quoted_name`.
|
|
|
|
:param order_by: Optional, may be the string "foreign_key" to sort
|
|
the result on foreign key dependencies. Does not automatically
|
|
resolve cycles, and will raise :class:`.CircularDependencyError`
|
|
if cycles exist.
|
|
|
|
.. deprecated:: 1.0.0 - see
|
|
:meth:`.Inspector.get_sorted_table_and_fkc_names` for a version
|
|
of this which resolves foreign key cycles between tables
|
|
automatically.
|
|
|
|
.. versionchanged:: 0.8 the "foreign_key" sorting sorts tables
|
|
in order of dependee to dependent; that is, in creation
|
|
order, rather than in drop order. This is to maintain
|
|
consistency with similar features such as
|
|
:attr:`.MetaData.sorted_tables` and :func:`.util.sort_tables`.
|
|
|
|
.. seealso::
|
|
|
|
:meth:`.Inspector.get_sorted_table_and_fkc_names`
|
|
|
|
:attr:`.MetaData.sorted_tables`
|
|
|
|
"""
|
|
|
|
if hasattr(self.dialect, 'get_table_names'):
|
|
tnames = self.dialect.get_table_names(
|
|
self.bind, schema, info_cache=self.info_cache)
|
|
else:
|
|
tnames = self.engine.table_names(schema)
|
|
if order_by == 'foreign_key':
|
|
tuples = []
|
|
for tname in tnames:
|
|
for fkey in self.get_foreign_keys(tname, schema):
|
|
if tname != fkey['referred_table']:
|
|
tuples.append((fkey['referred_table'], tname))
|
|
tnames = list(topological.sort(tuples, tnames))
|
|
return tnames
|
|
|
|
def get_sorted_table_and_fkc_names(self, schema=None):
|
|
"""Return dependency-sorted table and foreign key constraint names in
|
|
referred to within a particular schema.
|
|
|
|
This will yield 2-tuples of
|
|
``(tablename, [(tname, fkname), (tname, fkname), ...])``
|
|
consisting of table names in CREATE order grouped with the foreign key
|
|
constraint names that are not detected as belonging to a cycle.
|
|
The final element
|
|
will be ``(None, [(tname, fkname), (tname, fkname), ..])``
|
|
which will consist of remaining
|
|
foreign key constraint names that would require a separate CREATE
|
|
step after-the-fact, based on dependencies between tables.
|
|
|
|
.. versionadded:: 1.0.-
|
|
|
|
.. seealso::
|
|
|
|
:meth:`.Inspector.get_table_names`
|
|
|
|
:func:`.sort_tables_and_constraints` - similar method which works
|
|
with an already-given :class:`.MetaData`.
|
|
|
|
"""
|
|
if hasattr(self.dialect, 'get_table_names'):
|
|
tnames = self.dialect.get_table_names(
|
|
self.bind, schema, info_cache=self.info_cache)
|
|
else:
|
|
tnames = self.engine.table_names(schema)
|
|
|
|
tuples = set()
|
|
remaining_fkcs = set()
|
|
|
|
fknames_for_table = {}
|
|
for tname in tnames:
|
|
fkeys = self.get_foreign_keys(tname, schema)
|
|
fknames_for_table[tname] = set(
|
|
[fk['name'] for fk in fkeys]
|
|
)
|
|
for fkey in fkeys:
|
|
if tname != fkey['referred_table']:
|
|
tuples.add((fkey['referred_table'], tname))
|
|
try:
|
|
candidate_sort = list(topological.sort(tuples, tnames))
|
|
except exc.CircularDependencyError as err:
|
|
for edge in err.edges:
|
|
tuples.remove(edge)
|
|
remaining_fkcs.update(
|
|
(edge[1], fkc)
|
|
for fkc in fknames_for_table[edge[1]]
|
|
)
|
|
|
|
candidate_sort = list(topological.sort(tuples, tnames))
|
|
return [
|
|
(tname, fknames_for_table[tname].difference(remaining_fkcs))
|
|
for tname in candidate_sort
|
|
] + [(None, list(remaining_fkcs))]
|
|
|
|
def get_temp_table_names(self):
|
|
"""return a list of temporary table names for the current bind.
|
|
|
|
This method is unsupported by most dialects; currently
|
|
only SQLite implements it.
|
|
|
|
.. versionadded:: 1.0.0
|
|
|
|
"""
|
|
return self.dialect.get_temp_table_names(
|
|
self.bind, info_cache=self.info_cache)
|
|
|
|
def get_temp_view_names(self):
|
|
"""return a list of temporary view names for the current bind.
|
|
|
|
This method is unsupported by most dialects; currently
|
|
only SQLite implements it.
|
|
|
|
.. versionadded:: 1.0.0
|
|
|
|
"""
|
|
return self.dialect.get_temp_view_names(
|
|
self.bind, info_cache=self.info_cache)
|
|
|
|
def get_table_options(self, table_name, schema=None, **kw):
|
|
"""Return a dictionary of options specified when the table of the
|
|
given name was created.
|
|
|
|
This currently includes some options that apply to MySQL tables.
|
|
|
|
:param table_name: string name of the table. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
:param schema: string schema name; if omitted, uses the default schema
|
|
of the database connection. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
"""
|
|
if hasattr(self.dialect, 'get_table_options'):
|
|
return self.dialect.get_table_options(
|
|
self.bind, table_name, schema,
|
|
info_cache=self.info_cache, **kw)
|
|
return {}
|
|
|
|
def get_view_names(self, schema=None):
|
|
"""Return all view names in `schema`.
|
|
|
|
:param schema: Optional, retrieve names from a non-default schema.
|
|
For special quoting, use :class:`.quoted_name`.
|
|
|
|
"""
|
|
|
|
return self.dialect.get_view_names(self.bind, schema,
|
|
info_cache=self.info_cache)
|
|
|
|
def get_view_definition(self, view_name, schema=None):
|
|
"""Return definition for `view_name`.
|
|
|
|
:param schema: Optional, retrieve names from a non-default schema.
|
|
For special quoting, use :class:`.quoted_name`.
|
|
|
|
"""
|
|
|
|
return self.dialect.get_view_definition(
|
|
self.bind, view_name, schema, info_cache=self.info_cache)
|
|
|
|
def get_columns(self, table_name, schema=None, **kw):
|
|
"""Return information about columns in `table_name`.
|
|
|
|
Given a string `table_name` and an optional string `schema`, return
|
|
column information as a list of dicts with these keys:
|
|
|
|
* ``name`` - the column's name
|
|
|
|
* ``type`` - the type of this column; an instance of
|
|
:class:`~sqlalchemy.types.TypeEngine`
|
|
|
|
* ``nullable`` - boolean flag if the column is NULL or NOT NULL
|
|
|
|
* ``default`` - the column's server default value - this is returned
|
|
as a string SQL expression.
|
|
|
|
* ``attrs`` - dict containing optional column attributes
|
|
|
|
:param table_name: string name of the table. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
:param schema: string schema name; if omitted, uses the default schema
|
|
of the database connection. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
:return: list of dictionaries, each representing the definition of
|
|
a database column.
|
|
|
|
"""
|
|
|
|
col_defs = self.dialect.get_columns(self.bind, table_name, schema,
|
|
info_cache=self.info_cache,
|
|
**kw)
|
|
for col_def in col_defs:
|
|
# make this easy and only return instances for coltype
|
|
coltype = col_def['type']
|
|
if not isinstance(coltype, TypeEngine):
|
|
col_def['type'] = coltype()
|
|
return col_defs
|
|
|
|
@deprecated('0.7', 'Call to deprecated method get_primary_keys.'
|
|
' Use get_pk_constraint instead.')
|
|
def get_primary_keys(self, table_name, schema=None, **kw):
|
|
"""Return information about primary keys in `table_name`.
|
|
|
|
Given a string `table_name`, and an optional string `schema`, return
|
|
primary key information as a list of column names.
|
|
"""
|
|
|
|
return self.dialect.get_pk_constraint(self.bind, table_name, schema,
|
|
info_cache=self.info_cache,
|
|
**kw)['constrained_columns']
|
|
|
|
def get_pk_constraint(self, table_name, schema=None, **kw):
|
|
"""Return information about primary key constraint on `table_name`.
|
|
|
|
Given a string `table_name`, and an optional string `schema`, return
|
|
primary key information as a dictionary with these keys:
|
|
|
|
constrained_columns
|
|
a list of column names that make up the primary key
|
|
|
|
name
|
|
optional name of the primary key constraint.
|
|
|
|
:param table_name: string name of the table. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
:param schema: string schema name; if omitted, uses the default schema
|
|
of the database connection. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
"""
|
|
return self.dialect.get_pk_constraint(self.bind, table_name, schema,
|
|
info_cache=self.info_cache,
|
|
**kw)
|
|
|
|
def get_foreign_keys(self, table_name, schema=None, **kw):
|
|
"""Return information about foreign_keys in `table_name`.
|
|
|
|
Given a string `table_name`, and an optional string `schema`, return
|
|
foreign key information as a list of dicts with these keys:
|
|
|
|
constrained_columns
|
|
a list of column names that make up the foreign key
|
|
|
|
referred_schema
|
|
the name of the referred schema
|
|
|
|
referred_table
|
|
the name of the referred table
|
|
|
|
referred_columns
|
|
a list of column names in the referred table that correspond to
|
|
constrained_columns
|
|
|
|
name
|
|
optional name of the foreign key constraint.
|
|
|
|
:param table_name: string name of the table. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
:param schema: string schema name; if omitted, uses the default schema
|
|
of the database connection. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
"""
|
|
|
|
return self.dialect.get_foreign_keys(self.bind, table_name, schema,
|
|
info_cache=self.info_cache,
|
|
**kw)
|
|
|
|
def get_indexes(self, table_name, schema=None, **kw):
|
|
"""Return information about indexes in `table_name`.
|
|
|
|
Given a string `table_name` and an optional string `schema`, return
|
|
index information as a list of dicts with these keys:
|
|
|
|
name
|
|
the index's name
|
|
|
|
column_names
|
|
list of column names in order
|
|
|
|
unique
|
|
boolean
|
|
|
|
dialect_options
|
|
dict of dialect-specific index options. May not be present
|
|
for all dialects.
|
|
|
|
.. versionadded:: 1.0.0
|
|
|
|
:param table_name: string name of the table. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
:param schema: string schema name; if omitted, uses the default schema
|
|
of the database connection. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
"""
|
|
|
|
return self.dialect.get_indexes(self.bind, table_name,
|
|
schema,
|
|
info_cache=self.info_cache, **kw)
|
|
|
|
def get_unique_constraints(self, table_name, schema=None, **kw):
|
|
"""Return information about unique constraints in `table_name`.
|
|
|
|
Given a string `table_name` and an optional string `schema`, return
|
|
unique constraint information as a list of dicts with these keys:
|
|
|
|
name
|
|
the unique constraint's name
|
|
|
|
column_names
|
|
list of column names in order
|
|
|
|
:param table_name: string name of the table. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
:param schema: string schema name; if omitted, uses the default schema
|
|
of the database connection. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
.. versionadded:: 0.8.4
|
|
|
|
"""
|
|
|
|
return self.dialect.get_unique_constraints(
|
|
self.bind, table_name, schema, info_cache=self.info_cache, **kw)
|
|
|
|
def get_check_constraints(self, table_name, schema=None, **kw):
|
|
"""Return information about check constraints in `table_name`.
|
|
|
|
Given a string `table_name` and an optional string `schema`, return
|
|
check constraint information as a list of dicts with these keys:
|
|
|
|
name
|
|
the check constraint's name
|
|
|
|
sqltext
|
|
the check constraint's SQL expression
|
|
|
|
:param table_name: string name of the table. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
:param schema: string schema name; if omitted, uses the default schema
|
|
of the database connection. For special quoting,
|
|
use :class:`.quoted_name`.
|
|
|
|
.. versionadded:: 1.1.0
|
|
|
|
"""
|
|
|
|
return self.dialect.get_check_constraints(
|
|
self.bind, table_name, schema, info_cache=self.info_cache, **kw)
|
|
|
|
def reflecttable(self, table, include_columns, exclude_columns=(),
|
|
_extend_on=None):
|
|
"""Given a Table object, load its internal constructs based on
|
|
introspection.
|
|
|
|
This is the underlying method used by most dialects to produce
|
|
table reflection. Direct usage is like::
|
|
|
|
from sqlalchemy import create_engine, MetaData, Table
|
|
from sqlalchemy.engine import reflection
|
|
|
|
engine = create_engine('...')
|
|
meta = MetaData()
|
|
user_table = Table('user', meta)
|
|
insp = Inspector.from_engine(engine)
|
|
insp.reflecttable(user_table, None)
|
|
|
|
:param table: a :class:`~sqlalchemy.schema.Table` instance.
|
|
:param include_columns: a list of string column names to include
|
|
in the reflection process. If ``None``, all columns are reflected.
|
|
|
|
"""
|
|
|
|
if _extend_on is not None:
|
|
if table in _extend_on:
|
|
return
|
|
else:
|
|
_extend_on.add(table)
|
|
|
|
dialect = self.bind.dialect
|
|
|
|
schema = self.bind.schema_for_object(table)
|
|
|
|
table_name = table.name
|
|
|
|
# get table-level arguments that are specifically
|
|
# intended for reflection, e.g. oracle_resolve_synonyms.
|
|
# these are unconditionally passed to related Table
|
|
# objects
|
|
reflection_options = dict(
|
|
(k, table.dialect_kwargs.get(k))
|
|
for k in dialect.reflection_options
|
|
if k in table.dialect_kwargs
|
|
)
|
|
|
|
# reflect table options, like mysql_engine
|
|
tbl_opts = self.get_table_options(
|
|
table_name, schema, **table.dialect_kwargs)
|
|
if tbl_opts:
|
|
# add additional kwargs to the Table if the dialect
|
|
# returned them
|
|
table._validate_dialect_kwargs(tbl_opts)
|
|
|
|
if util.py2k:
|
|
if isinstance(schema, str):
|
|
schema = schema.decode(dialect.encoding)
|
|
if isinstance(table_name, str):
|
|
table_name = table_name.decode(dialect.encoding)
|
|
|
|
found_table = False
|
|
cols_by_orig_name = {}
|
|
|
|
for col_d in self.get_columns(
|
|
table_name, schema, **table.dialect_kwargs):
|
|
found_table = True
|
|
|
|
self._reflect_column(
|
|
table, col_d, include_columns,
|
|
exclude_columns, cols_by_orig_name)
|
|
|
|
if not found_table:
|
|
raise exc.NoSuchTableError(table.name)
|
|
|
|
self._reflect_pk(
|
|
table_name, schema, table, cols_by_orig_name, exclude_columns)
|
|
|
|
self._reflect_fk(
|
|
table_name, schema, table, cols_by_orig_name,
|
|
exclude_columns, _extend_on, reflection_options)
|
|
|
|
self._reflect_indexes(
|
|
table_name, schema, table, cols_by_orig_name,
|
|
include_columns, exclude_columns, reflection_options)
|
|
|
|
self._reflect_unique_constraints(
|
|
table_name, schema, table, cols_by_orig_name,
|
|
include_columns, exclude_columns, reflection_options)
|
|
|
|
self._reflect_check_constraints(
|
|
table_name, schema, table, cols_by_orig_name,
|
|
include_columns, exclude_columns, reflection_options)
|
|
|
|
def _reflect_column(
|
|
self, table, col_d, include_columns,
|
|
exclude_columns, cols_by_orig_name):
|
|
|
|
orig_name = col_d['name']
|
|
|
|
table.dispatch.column_reflect(self, table, col_d)
|
|
|
|
# fetch name again as column_reflect is allowed to
|
|
# change it
|
|
name = col_d['name']
|
|
if (include_columns and name not in include_columns) \
|
|
or (exclude_columns and name in exclude_columns):
|
|
return
|
|
|
|
coltype = col_d['type']
|
|
|
|
col_kw = dict(
|
|
(k, col_d[k])
|
|
for k in ['nullable', 'autoincrement', 'quote', 'info', 'key']
|
|
if k in col_d
|
|
)
|
|
|
|
colargs = []
|
|
if col_d.get('default') is not None:
|
|
default = col_d['default']
|
|
if isinstance(default, sql.elements.TextClause):
|
|
default = sa_schema.DefaultClause(default, _reflected=True)
|
|
elif not isinstance(default, sa_schema.FetchedValue):
|
|
default = sa_schema.DefaultClause(
|
|
sql.text(col_d['default']), _reflected=True)
|
|
|
|
colargs.append(default)
|
|
|
|
if 'sequence' in col_d:
|
|
self._reflect_col_sequence(col_d, colargs)
|
|
|
|
cols_by_orig_name[orig_name] = col = \
|
|
sa_schema.Column(name, coltype, *colargs, **col_kw)
|
|
|
|
if col.key in table.primary_key:
|
|
col.primary_key = True
|
|
table.append_column(col)
|
|
|
|
def _reflect_col_sequence(self, col_d, colargs):
|
|
if 'sequence' in col_d:
|
|
# TODO: mssql and sybase are using this.
|
|
seq = col_d['sequence']
|
|
sequence = sa_schema.Sequence(seq['name'], 1, 1)
|
|
if 'start' in seq:
|
|
sequence.start = seq['start']
|
|
if 'increment' in seq:
|
|
sequence.increment = seq['increment']
|
|
colargs.append(sequence)
|
|
|
|
def _reflect_pk(
|
|
self, table_name, schema, table,
|
|
cols_by_orig_name, exclude_columns):
|
|
pk_cons = self.get_pk_constraint(
|
|
table_name, schema, **table.dialect_kwargs)
|
|
if pk_cons:
|
|
pk_cols = [
|
|
cols_by_orig_name[pk]
|
|
for pk in pk_cons['constrained_columns']
|
|
if pk in cols_by_orig_name and pk not in exclude_columns
|
|
]
|
|
|
|
# update pk constraint name
|
|
table.primary_key.name = pk_cons.get('name')
|
|
|
|
# tell the PKConstraint to re-initialize
|
|
# its column collection
|
|
table.primary_key._reload(pk_cols)
|
|
|
|
def _reflect_fk(
|
|
self, table_name, schema, table, cols_by_orig_name,
|
|
exclude_columns, _extend_on, reflection_options):
|
|
fkeys = self.get_foreign_keys(
|
|
table_name, schema, **table.dialect_kwargs)
|
|
for fkey_d in fkeys:
|
|
conname = fkey_d['name']
|
|
# look for columns by orig name in cols_by_orig_name,
|
|
# but support columns that are in-Python only as fallback
|
|
constrained_columns = [
|
|
cols_by_orig_name[c].key
|
|
if c in cols_by_orig_name else c
|
|
for c in fkey_d['constrained_columns']
|
|
]
|
|
if exclude_columns and set(constrained_columns).intersection(
|
|
exclude_columns):
|
|
continue
|
|
referred_schema = fkey_d['referred_schema']
|
|
referred_table = fkey_d['referred_table']
|
|
referred_columns = fkey_d['referred_columns']
|
|
refspec = []
|
|
if referred_schema is not None:
|
|
sa_schema.Table(referred_table, table.metadata,
|
|
autoload=True, schema=referred_schema,
|
|
autoload_with=self.bind,
|
|
_extend_on=_extend_on,
|
|
**reflection_options
|
|
)
|
|
for column in referred_columns:
|
|
refspec.append(".".join(
|
|
[referred_schema, referred_table, column]))
|
|
else:
|
|
sa_schema.Table(referred_table, table.metadata, autoload=True,
|
|
autoload_with=self.bind,
|
|
schema=sa_schema.BLANK_SCHEMA,
|
|
_extend_on=_extend_on,
|
|
**reflection_options
|
|
)
|
|
for column in referred_columns:
|
|
refspec.append(".".join([referred_table, column]))
|
|
if 'options' in fkey_d:
|
|
options = fkey_d['options']
|
|
else:
|
|
options = {}
|
|
table.append_constraint(
|
|
sa_schema.ForeignKeyConstraint(constrained_columns, refspec,
|
|
conname, link_to_name=True,
|
|
**options))
|
|
|
|
def _reflect_indexes(
|
|
self, table_name, schema, table, cols_by_orig_name,
|
|
include_columns, exclude_columns, reflection_options):
|
|
# Indexes
|
|
indexes = self.get_indexes(table_name, schema)
|
|
for index_d in indexes:
|
|
name = index_d['name']
|
|
columns = index_d['column_names']
|
|
unique = index_d['unique']
|
|
flavor = index_d.get('type', 'index')
|
|
dialect_options = index_d.get('dialect_options', {})
|
|
|
|
duplicates = index_d.get('duplicates_constraint')
|
|
if include_columns and \
|
|
not set(columns).issubset(include_columns):
|
|
util.warn(
|
|
"Omitting %s key for (%s), key covers omitted columns." %
|
|
(flavor, ', '.join(columns)))
|
|
continue
|
|
if duplicates:
|
|
continue
|
|
# look for columns by orig name in cols_by_orig_name,
|
|
# but support columns that are in-Python only as fallback
|
|
idx_cols = []
|
|
for c in columns:
|
|
try:
|
|
idx_col = cols_by_orig_name[c] \
|
|
if c in cols_by_orig_name else table.c[c]
|
|
except KeyError:
|
|
util.warn(
|
|
"%s key '%s' was not located in "
|
|
"columns for table '%s'" % (
|
|
flavor, c, table_name
|
|
))
|
|
else:
|
|
idx_cols.append(idx_col)
|
|
|
|
sa_schema.Index(
|
|
name, *idx_cols,
|
|
**dict(list(dialect_options.items()) + [('unique', unique)])
|
|
)
|
|
|
|
def _reflect_unique_constraints(
|
|
self, table_name, schema, table, cols_by_orig_name,
|
|
include_columns, exclude_columns, reflection_options):
|
|
|
|
# Unique Constraints
|
|
try:
|
|
constraints = self.get_unique_constraints(table_name, schema)
|
|
except NotImplementedError:
|
|
# optional dialect feature
|
|
return
|
|
|
|
for const_d in constraints:
|
|
conname = const_d['name']
|
|
columns = const_d['column_names']
|
|
duplicates = const_d.get('duplicates_index')
|
|
if include_columns and \
|
|
not set(columns).issubset(include_columns):
|
|
util.warn(
|
|
"Omitting unique constraint key for (%s), "
|
|
"key covers omitted columns." %
|
|
', '.join(columns))
|
|
continue
|
|
if duplicates:
|
|
continue
|
|
# look for columns by orig name in cols_by_orig_name,
|
|
# but support columns that are in-Python only as fallback
|
|
constrained_cols = []
|
|
for c in columns:
|
|
try:
|
|
constrained_col = cols_by_orig_name[c] \
|
|
if c in cols_by_orig_name else table.c[c]
|
|
except KeyError:
|
|
util.warn(
|
|
"unique constraint key '%s' was not located in "
|
|
"columns for table '%s'" % (c, table_name))
|
|
else:
|
|
constrained_cols.append(constrained_col)
|
|
table.append_constraint(
|
|
sa_schema.UniqueConstraint(*constrained_cols, name=conname))
|
|
|
|
def _reflect_check_constraints(
|
|
self, table_name, schema, table, cols_by_orig_name,
|
|
include_columns, exclude_columns, reflection_options):
|
|
try:
|
|
constraints = self.get_check_constraints(table_name, schema)
|
|
except NotImplementedError:
|
|
# optional dialect feature
|
|
return
|
|
|
|
for const_d in constraints:
|
|
table.append_constraint(
|
|
sa_schema.CheckConstraint(**const_d))
|