837 lines
30 KiB
Python
837 lines
30 KiB
Python
# engine/default.py
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# Copyright (C) 2005-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""Default implementations of per-dialect sqlalchemy.engine classes.
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These are semi-private implementation classes which are only of importance
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to database dialect authors; dialects will usually use the classes here
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as the base class for their own corresponding classes.
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"""
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import re
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import random
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from . import reflection, interfaces, result
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from ..sql import compiler, expression
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from .. import exc, types as sqltypes, util, pool, processors
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import codecs
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import weakref
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AUTOCOMMIT_REGEXP = re.compile(
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r'\s*(?:UPDATE|INSERT|CREATE|DELETE|DROP|ALTER)',
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re.I | re.UNICODE)
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class DefaultDialect(interfaces.Dialect):
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"""Default implementation of Dialect"""
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statement_compiler = compiler.SQLCompiler
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ddl_compiler = compiler.DDLCompiler
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type_compiler = compiler.GenericTypeCompiler
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preparer = compiler.IdentifierPreparer
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supports_alter = True
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# the first value we'd get for an autoincrement
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# column.
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default_sequence_base = 1
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# most DBAPIs happy with this for execute().
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# not cx_oracle.
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execute_sequence_format = tuple
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supports_views = True
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supports_sequences = False
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sequences_optional = False
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preexecute_autoincrement_sequences = False
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postfetch_lastrowid = True
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implicit_returning = False
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supports_native_enum = False
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supports_native_boolean = False
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# if the NUMERIC type
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# returns decimal.Decimal.
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# *not* the FLOAT type however.
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supports_native_decimal = False
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# Py3K
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#supports_unicode_statements = True
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#supports_unicode_binds = True
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#returns_unicode_strings = True
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#description_encoding = None
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# Py2K
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supports_unicode_statements = False
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supports_unicode_binds = False
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returns_unicode_strings = False
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description_encoding = 'use_encoding'
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# end Py2K
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name = 'default'
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# length at which to truncate
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# any identifier.
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max_identifier_length = 9999
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# length at which to truncate
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# the name of an index.
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# Usually None to indicate
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# 'use max_identifier_length'.
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# thanks to MySQL, sigh
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max_index_name_length = None
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supports_sane_rowcount = True
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supports_sane_multi_rowcount = True
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dbapi_type_map = {}
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colspecs = {}
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default_paramstyle = 'named'
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supports_default_values = False
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supports_empty_insert = True
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supports_multivalues_insert = False
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server_version_info = None
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# indicates symbol names are
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# UPPERCASEd if they are case insensitive
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# within the database.
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# if this is True, the methods normalize_name()
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# and denormalize_name() must be provided.
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requires_name_normalize = False
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reflection_options = ()
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def __init__(self, convert_unicode=False,
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encoding='utf-8', paramstyle=None, dbapi=None,
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implicit_returning=None,
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case_sensitive=True,
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label_length=None, **kwargs):
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if not getattr(self, 'ported_sqla_06', True):
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util.warn(
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"The %s dialect is not yet ported to the 0.6 format" %
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self.name)
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self.convert_unicode = convert_unicode
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self.encoding = encoding
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self.positional = False
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self._ischema = None
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self.dbapi = dbapi
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if paramstyle is not None:
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self.paramstyle = paramstyle
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elif self.dbapi is not None:
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self.paramstyle = self.dbapi.paramstyle
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else:
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self.paramstyle = self.default_paramstyle
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if implicit_returning is not None:
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self.implicit_returning = implicit_returning
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self.positional = self.paramstyle in ('qmark', 'format', 'numeric')
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self.identifier_preparer = self.preparer(self)
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self.type_compiler = self.type_compiler(self)
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self.case_sensitive = case_sensitive
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if label_length and label_length > self.max_identifier_length:
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raise exc.ArgumentError(
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"Label length of %d is greater than this dialect's"
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" maximum identifier length of %d" %
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(label_length, self.max_identifier_length))
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self.label_length = label_length
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if self.description_encoding == 'use_encoding':
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self._description_decoder = \
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processors.to_unicode_processor_factory(
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encoding
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)
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elif self.description_encoding is not None:
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self._description_decoder = \
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processors.to_unicode_processor_factory(
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self.description_encoding
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)
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self._encoder = codecs.getencoder(self.encoding)
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self._decoder = processors.to_unicode_processor_factory(self.encoding)
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@util.memoized_property
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def _type_memos(self):
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return weakref.WeakKeyDictionary()
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@property
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def dialect_description(self):
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return self.name + "+" + self.driver
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@classmethod
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def get_pool_class(cls, url):
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return getattr(cls, 'poolclass', pool.QueuePool)
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def initialize(self, connection):
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try:
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self.server_version_info = \
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self._get_server_version_info(connection)
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except NotImplementedError:
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self.server_version_info = None
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try:
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self.default_schema_name = \
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self._get_default_schema_name(connection)
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except NotImplementedError:
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self.default_schema_name = None
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try:
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self.default_isolation_level = \
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self.get_isolation_level(connection.connection)
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except NotImplementedError:
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self.default_isolation_level = None
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self.returns_unicode_strings = self._check_unicode_returns(connection)
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self.do_rollback(connection.connection)
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def on_connect(self):
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"""return a callable which sets up a newly created DBAPI connection.
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This is used to set dialect-wide per-connection options such as
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isolation modes, unicode modes, etc.
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If a callable is returned, it will be assembled into a pool listener
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that receives the direct DBAPI connection, with all wrappers removed.
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If None is returned, no listener will be generated.
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"""
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return None
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def _check_unicode_returns(self, connection):
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# Py2K
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if self.supports_unicode_statements:
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cast_to = unicode
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else:
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cast_to = str
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# end Py2K
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# Py3K
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#cast_to = str
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def check_unicode(formatstr, type_):
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cursor = connection.connection.cursor()
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try:
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try:
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cursor.execute(
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cast_to(
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expression.select(
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[expression.cast(
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expression.literal_column(
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"'test %s returns'" % formatstr),
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type_)
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]).compile(dialect=self)
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)
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)
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row = cursor.fetchone()
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return isinstance(row[0], unicode)
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except self.dbapi.Error, de:
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util.warn("Exception attempting to "
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"detect unicode returns: %r" % de)
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return False
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finally:
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cursor.close()
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# detect plain VARCHAR
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unicode_for_varchar = check_unicode("plain", sqltypes.VARCHAR(60))
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# detect if there's an NVARCHAR type with different behavior available
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unicode_for_unicode = check_unicode("unicode", sqltypes.Unicode(60))
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if unicode_for_unicode and not unicode_for_varchar:
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return "conditional"
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else:
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return unicode_for_varchar
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def type_descriptor(self, typeobj):
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"""Provide a database-specific :class:`.TypeEngine` object, given
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the generic object which comes from the types module.
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This method looks for a dictionary called
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``colspecs`` as a class or instance-level variable,
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and passes on to :func:`.types.adapt_type`.
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"""
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return sqltypes.adapt_type(typeobj, self.colspecs)
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def reflecttable(self, connection, table, include_columns,
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exclude_columns=None):
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insp = reflection.Inspector.from_engine(connection)
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return insp.reflecttable(table, include_columns, exclude_columns)
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def get_pk_constraint(self, conn, table_name, schema=None, **kw):
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"""Compatibility method, adapts the result of get_primary_keys()
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for those dialects which don't implement get_pk_constraint().
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"""
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return {
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'constrained_columns':
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self.get_primary_keys(conn, table_name,
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schema=schema, **kw)
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}
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def validate_identifier(self, ident):
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if len(ident) > self.max_identifier_length:
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raise exc.IdentifierError(
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"Identifier '%s' exceeds maximum length of %d characters" %
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(ident, self.max_identifier_length)
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)
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def connect(self, *cargs, **cparams):
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return self.dbapi.connect(*cargs, **cparams)
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def create_connect_args(self, url):
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opts = url.translate_connect_args()
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opts.update(url.query)
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return [[], opts]
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def do_begin(self, dbapi_connection):
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pass
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def do_rollback(self, dbapi_connection):
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dbapi_connection.rollback()
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def do_commit(self, dbapi_connection):
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dbapi_connection.commit()
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def do_close(self, dbapi_connection):
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dbapi_connection.close()
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def create_xid(self):
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"""Create a random two-phase transaction ID.
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This id will be passed to do_begin_twophase(), do_rollback_twophase(),
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do_commit_twophase(). Its format is unspecified.
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"""
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return "_sa_%032x" % random.randint(0, 2 ** 128)
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def do_savepoint(self, connection, name):
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connection.execute(expression.SavepointClause(name))
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def do_rollback_to_savepoint(self, connection, name):
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connection.execute(expression.RollbackToSavepointClause(name))
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def do_release_savepoint(self, connection, name):
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connection.execute(expression.ReleaseSavepointClause(name))
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def do_executemany(self, cursor, statement, parameters, context=None):
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cursor.executemany(statement, parameters)
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def do_execute(self, cursor, statement, parameters, context=None):
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cursor.execute(statement, parameters)
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def do_execute_no_params(self, cursor, statement, context=None):
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cursor.execute(statement)
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def is_disconnect(self, e, connection, cursor):
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return False
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def reset_isolation_level(self, dbapi_conn):
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# default_isolation_level is read from the first connection
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# after the initial set of 'isolation_level', if any, so is
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# the configured default of this dialect.
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self.set_isolation_level(dbapi_conn, self.default_isolation_level)
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class DefaultExecutionContext(interfaces.ExecutionContext):
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isinsert = False
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isupdate = False
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isdelete = False
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isddl = False
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executemany = False
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result_map = None
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compiled = None
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statement = None
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postfetch_cols = None
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prefetch_cols = None
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_is_implicit_returning = False
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_is_explicit_returning = False
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# a hook for SQLite's translation of
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# result column names
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_translate_colname = None
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@classmethod
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def _init_ddl(cls, dialect, connection, dbapi_connection, compiled_ddl):
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"""Initialize execution context for a DDLElement construct."""
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self = cls.__new__(cls)
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self.dialect = dialect
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self.root_connection = connection
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self._dbapi_connection = dbapi_connection
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self.engine = connection.engine
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self.compiled = compiled = compiled_ddl
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self.isddl = True
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self.execution_options = compiled.statement._execution_options
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if connection._execution_options:
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self.execution_options = dict(self.execution_options)
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self.execution_options.update(connection._execution_options)
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if not dialect.supports_unicode_statements:
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self.unicode_statement = unicode(compiled)
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self.statement = dialect._encoder(self.unicode_statement)[0]
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else:
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self.statement = self.unicode_statement = unicode(compiled)
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self.cursor = self.create_cursor()
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self.compiled_parameters = []
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if dialect.positional:
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self.parameters = [dialect.execute_sequence_format()]
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else:
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self.parameters = [{}]
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return self
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@classmethod
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def _init_compiled(cls, dialect, connection, dbapi_connection,
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compiled, parameters):
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"""Initialize execution context for a Compiled construct."""
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self = cls.__new__(cls)
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self.dialect = dialect
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self.root_connection = connection
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self._dbapi_connection = dbapi_connection
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self.engine = connection.engine
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self.compiled = compiled
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if not compiled.can_execute:
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raise exc.ArgumentError("Not an executable clause")
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self.execution_options = compiled.statement._execution_options
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if connection._execution_options:
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self.execution_options = dict(self.execution_options)
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self.execution_options.update(connection._execution_options)
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# compiled clauseelement. process bind params, process table defaults,
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# track collections used by ResultProxy to target and process results
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self.result_map = compiled.result_map
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self.unicode_statement = unicode(compiled)
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if not dialect.supports_unicode_statements:
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self.statement = self.unicode_statement.encode(
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self.dialect.encoding)
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else:
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self.statement = self.unicode_statement
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self.isinsert = compiled.isinsert
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self.isupdate = compiled.isupdate
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self.isdelete = compiled.isdelete
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if self.isinsert or self.isupdate or self.isdelete:
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self._is_explicit_returning = bool(compiled.statement._returning)
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self._is_implicit_returning = bool(compiled.returning and \
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not compiled.statement._returning)
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if not parameters:
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self.compiled_parameters = [compiled.construct_params()]
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else:
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self.compiled_parameters = \
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[compiled.construct_params(m, _group_number=grp) for
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grp, m in enumerate(parameters)]
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self.executemany = len(parameters) > 1
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self.cursor = self.create_cursor()
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if self.isinsert or self.isupdate:
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self.postfetch_cols = self.compiled.postfetch
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self.prefetch_cols = self.compiled.prefetch
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self.__process_defaults()
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processors = compiled._bind_processors
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# Convert the dictionary of bind parameter values
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# into a dict or list to be sent to the DBAPI's
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# execute() or executemany() method.
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parameters = []
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if dialect.positional:
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for compiled_params in self.compiled_parameters:
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param = []
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for key in self.compiled.positiontup:
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if key in processors:
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param.append(processors[key](compiled_params[key]))
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else:
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param.append(compiled_params[key])
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parameters.append(dialect.execute_sequence_format(param))
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else:
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encode = not dialect.supports_unicode_statements
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for compiled_params in self.compiled_parameters:
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param = {}
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if encode:
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for key in compiled_params:
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if key in processors:
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param[dialect._encoder(key)[0]] = \
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processors[key](compiled_params[key])
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else:
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param[dialect._encoder(key)[0]] = \
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compiled_params[key]
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else:
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for key in compiled_params:
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if key in processors:
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param[key] = processors[key](compiled_params[key])
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else:
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param[key] = compiled_params[key]
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parameters.append(param)
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self.parameters = dialect.execute_sequence_format(parameters)
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return self
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@classmethod
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def _init_statement(cls, dialect, connection, dbapi_connection,
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statement, parameters):
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"""Initialize execution context for a string SQL statement."""
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self = cls.__new__(cls)
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self.dialect = dialect
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self.root_connection = connection
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self._dbapi_connection = dbapi_connection
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self.engine = connection.engine
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# plain text statement
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self.execution_options = connection._execution_options
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if not parameters:
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if self.dialect.positional:
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self.parameters = [dialect.execute_sequence_format()]
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else:
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self.parameters = [{}]
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elif isinstance(parameters[0], dialect.execute_sequence_format):
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self.parameters = parameters
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elif isinstance(parameters[0], dict):
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if dialect.supports_unicode_statements:
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self.parameters = parameters
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else:
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self.parameters = [
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dict((dialect._encoder(k)[0], d[k]) for k in d)
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for d in parameters
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] or [{}]
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else:
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self.parameters = [dialect.execute_sequence_format(p)
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for p in parameters]
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self.executemany = len(parameters) > 1
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if not dialect.supports_unicode_statements and \
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isinstance(statement, unicode):
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self.unicode_statement = statement
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self.statement = dialect._encoder(statement)[0]
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else:
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self.statement = self.unicode_statement = statement
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self.cursor = self.create_cursor()
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return self
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@classmethod
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def _init_default(cls, dialect, connection, dbapi_connection):
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"""Initialize execution context for a ColumnDefault construct."""
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self = cls.__new__(cls)
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self.dialect = dialect
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self.root_connection = connection
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self._dbapi_connection = dbapi_connection
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self.engine = connection.engine
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self.execution_options = connection._execution_options
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self.cursor = self.create_cursor()
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return self
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@util.memoized_property
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def no_parameters(self):
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return self.execution_options.get("no_parameters", False)
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|
|
@util.memoized_property
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|
def is_crud(self):
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return self.isinsert or self.isupdate or self.isdelete
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|
|
@util.memoized_property
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|
def should_autocommit(self):
|
|
autocommit = self.execution_options.get('autocommit',
|
|
not self.compiled and
|
|
self.statement and
|
|
expression.PARSE_AUTOCOMMIT
|
|
or False)
|
|
|
|
if autocommit is expression.PARSE_AUTOCOMMIT:
|
|
return self.should_autocommit_text(self.unicode_statement)
|
|
else:
|
|
return autocommit
|
|
|
|
def _execute_scalar(self, stmt, type_):
|
|
"""Execute a string statement on the current cursor, returning a
|
|
scalar result.
|
|
|
|
Used to fire off sequences, default phrases, and "select lastrowid"
|
|
types of statements individually or in the context of a parent INSERT
|
|
or UPDATE statement.
|
|
|
|
"""
|
|
|
|
conn = self.root_connection
|
|
if isinstance(stmt, unicode) and \
|
|
not self.dialect.supports_unicode_statements:
|
|
stmt = self.dialect._encoder(stmt)[0]
|
|
|
|
if self.dialect.positional:
|
|
default_params = self.dialect.execute_sequence_format()
|
|
else:
|
|
default_params = {}
|
|
|
|
conn._cursor_execute(self.cursor, stmt, default_params, context=self)
|
|
r = self.cursor.fetchone()[0]
|
|
if type_ is not None:
|
|
# apply type post processors to the result
|
|
proc = type_._cached_result_processor(
|
|
self.dialect,
|
|
self.cursor.description[0][1]
|
|
)
|
|
if proc:
|
|
return proc(r)
|
|
return r
|
|
|
|
@property
|
|
def connection(self):
|
|
return self.root_connection._branch()
|
|
|
|
def should_autocommit_text(self, statement):
|
|
return AUTOCOMMIT_REGEXP.match(statement)
|
|
|
|
def create_cursor(self):
|
|
return self._dbapi_connection.cursor()
|
|
|
|
def pre_exec(self):
|
|
pass
|
|
|
|
def post_exec(self):
|
|
pass
|
|
|
|
def get_result_processor(self, type_, colname, coltype):
|
|
"""Return a 'result processor' for a given type as present in
|
|
cursor.description.
|
|
|
|
This has a default implementation that dialects can override
|
|
for context-sensitive result type handling.
|
|
|
|
"""
|
|
return type_._cached_result_processor(self.dialect, coltype)
|
|
|
|
def get_lastrowid(self):
|
|
"""return self.cursor.lastrowid, or equivalent, after an INSERT.
|
|
|
|
This may involve calling special cursor functions,
|
|
issuing a new SELECT on the cursor (or a new one),
|
|
or returning a stored value that was
|
|
calculated within post_exec().
|
|
|
|
This function will only be called for dialects
|
|
which support "implicit" primary key generation,
|
|
keep preexecute_autoincrement_sequences set to False,
|
|
and when no explicit id value was bound to the
|
|
statement.
|
|
|
|
The function is called once, directly after
|
|
post_exec() and before the transaction is committed
|
|
or ResultProxy is generated. If the post_exec()
|
|
method assigns a value to `self._lastrowid`, the
|
|
value is used in place of calling get_lastrowid().
|
|
|
|
Note that this method is *not* equivalent to the
|
|
``lastrowid`` method on ``ResultProxy``, which is a
|
|
direct proxy to the DBAPI ``lastrowid`` accessor
|
|
in all cases.
|
|
|
|
"""
|
|
return self.cursor.lastrowid
|
|
|
|
def handle_dbapi_exception(self, e):
|
|
pass
|
|
|
|
def get_result_proxy(self):
|
|
return result.ResultProxy(self)
|
|
|
|
@property
|
|
def rowcount(self):
|
|
return self.cursor.rowcount
|
|
|
|
def supports_sane_rowcount(self):
|
|
return self.dialect.supports_sane_rowcount
|
|
|
|
def supports_sane_multi_rowcount(self):
|
|
return self.dialect.supports_sane_multi_rowcount
|
|
|
|
def post_insert(self):
|
|
if not self._is_implicit_returning and \
|
|
not self._is_explicit_returning and \
|
|
not self.compiled.inline and \
|
|
self.dialect.postfetch_lastrowid and \
|
|
(not self.inserted_primary_key or \
|
|
None in self.inserted_primary_key):
|
|
|
|
table = self.compiled.statement.table
|
|
lastrowid = self.get_lastrowid()
|
|
autoinc_col = table._autoincrement_column
|
|
if autoinc_col is not None:
|
|
# apply type post processors to the lastrowid
|
|
proc = autoinc_col.type._cached_result_processor(
|
|
self.dialect, None)
|
|
if proc is not None:
|
|
lastrowid = proc(lastrowid)
|
|
|
|
self.inserted_primary_key = [
|
|
lastrowid if c is autoinc_col else v
|
|
for c, v in zip(
|
|
table.primary_key,
|
|
self.inserted_primary_key)
|
|
]
|
|
|
|
def _fetch_implicit_returning(self, resultproxy):
|
|
table = self.compiled.statement.table
|
|
row = resultproxy.fetchone()
|
|
|
|
ipk = []
|
|
for c, v in zip(table.primary_key, self.inserted_primary_key):
|
|
if v is not None:
|
|
ipk.append(v)
|
|
else:
|
|
ipk.append(row[c])
|
|
|
|
self.inserted_primary_key = ipk
|
|
|
|
def lastrow_has_defaults(self):
|
|
return (self.isinsert or self.isupdate) and \
|
|
bool(self.postfetch_cols)
|
|
|
|
def set_input_sizes(self, translate=None, exclude_types=None):
|
|
"""Given a cursor and ClauseParameters, call the appropriate
|
|
style of ``setinputsizes()`` on the cursor, using DB-API types
|
|
from the bind parameter's ``TypeEngine`` objects.
|
|
|
|
This method only called by those dialects which require it,
|
|
currently cx_oracle.
|
|
|
|
"""
|
|
|
|
if not hasattr(self.compiled, 'bind_names'):
|
|
return
|
|
|
|
types = dict(
|
|
(self.compiled.bind_names[bindparam], bindparam.type)
|
|
for bindparam in self.compiled.bind_names)
|
|
|
|
if self.dialect.positional:
|
|
inputsizes = []
|
|
for key in self.compiled.positiontup:
|
|
typeengine = types[key]
|
|
dbtype = typeengine.dialect_impl(self.dialect).\
|
|
get_dbapi_type(self.dialect.dbapi)
|
|
if dbtype is not None and \
|
|
(not exclude_types or dbtype not in exclude_types):
|
|
inputsizes.append(dbtype)
|
|
try:
|
|
self.cursor.setinputsizes(*inputsizes)
|
|
except Exception, e:
|
|
self.root_connection._handle_dbapi_exception(
|
|
e, None, None, None, self)
|
|
else:
|
|
inputsizes = {}
|
|
for key in self.compiled.bind_names.values():
|
|
typeengine = types[key]
|
|
dbtype = typeengine.dialect_impl(self.dialect).\
|
|
get_dbapi_type(self.dialect.dbapi)
|
|
if dbtype is not None and \
|
|
(not exclude_types or dbtype not in exclude_types):
|
|
if translate:
|
|
key = translate.get(key, key)
|
|
if not self.dialect.supports_unicode_binds:
|
|
key = self.dialect._encoder(key)[0]
|
|
inputsizes[key] = dbtype
|
|
try:
|
|
self.cursor.setinputsizes(**inputsizes)
|
|
except Exception, e:
|
|
self.root_connection._handle_dbapi_exception(
|
|
e, None, None, None, self)
|
|
|
|
def _exec_default(self, default, type_):
|
|
if default.is_sequence:
|
|
return self.fire_sequence(default, type_)
|
|
elif default.is_callable:
|
|
return default.arg(self)
|
|
elif default.is_clause_element:
|
|
# TODO: expensive branching here should be
|
|
# pulled into _exec_scalar()
|
|
conn = self.connection
|
|
c = expression.select([default.arg]).compile(bind=conn)
|
|
return conn._execute_compiled(c, (), {}).scalar()
|
|
else:
|
|
return default.arg
|
|
|
|
def get_insert_default(self, column):
|
|
if column.default is None:
|
|
return None
|
|
else:
|
|
return self._exec_default(column.default, column.type)
|
|
|
|
def get_update_default(self, column):
|
|
if column.onupdate is None:
|
|
return None
|
|
else:
|
|
return self._exec_default(column.onupdate, column.type)
|
|
|
|
def __process_defaults(self):
|
|
"""Generate default values for compiled insert/update statements,
|
|
and generate inserted_primary_key collection.
|
|
"""
|
|
|
|
if self.executemany:
|
|
if len(self.compiled.prefetch):
|
|
scalar_defaults = {}
|
|
|
|
# pre-determine scalar Python-side defaults
|
|
# to avoid many calls of get_insert_default()/
|
|
# get_update_default()
|
|
for c in self.prefetch_cols:
|
|
if self.isinsert and c.default and c.default.is_scalar:
|
|
scalar_defaults[c] = c.default.arg
|
|
elif self.isupdate and c.onupdate and c.onupdate.is_scalar:
|
|
scalar_defaults[c] = c.onupdate.arg
|
|
|
|
for param in self.compiled_parameters:
|
|
self.current_parameters = param
|
|
for c in self.prefetch_cols:
|
|
if c in scalar_defaults:
|
|
val = scalar_defaults[c]
|
|
elif self.isinsert:
|
|
val = self.get_insert_default(c)
|
|
else:
|
|
val = self.get_update_default(c)
|
|
if val is not None:
|
|
param[c.key] = val
|
|
del self.current_parameters
|
|
else:
|
|
self.current_parameters = compiled_parameters = \
|
|
self.compiled_parameters[0]
|
|
|
|
for c in self.compiled.prefetch:
|
|
if self.isinsert:
|
|
val = self.get_insert_default(c)
|
|
else:
|
|
val = self.get_update_default(c)
|
|
|
|
if val is not None:
|
|
compiled_parameters[c.key] = val
|
|
del self.current_parameters
|
|
|
|
if self.isinsert:
|
|
self.inserted_primary_key = [
|
|
self.compiled_parameters[0].get(c.key, None)
|
|
for c in self.compiled.\
|
|
statement.table.primary_key
|
|
]
|
|
|
|
|
|
DefaultDialect.execution_ctx_cls = DefaultExecutionContext
|