/usr/lib/python2.7/dist-packages/sqlalchemy/engine/default.py is in python-sqlalchemy 0.8.4-1build1.
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# Copyright (C) 2005-2013 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
"""Default implementations of per-dialect sqlalchemy.engine classes.
These are semi-private implementation classes which are only of importance
to database dialect authors; dialects will usually use the classes here
as the base class for their own corresponding classes.
"""
import re
import random
from . import reflection, interfaces, result
from ..sql import compiler, expression
from .. import exc, types as sqltypes, util, pool, processors
import codecs
import weakref
AUTOCOMMIT_REGEXP = re.compile(
r'\s*(?:UPDATE|INSERT|CREATE|DELETE|DROP|ALTER)',
re.I | re.UNICODE)
class DefaultDialect(interfaces.Dialect):
"""Default implementation of Dialect"""
statement_compiler = compiler.SQLCompiler
ddl_compiler = compiler.DDLCompiler
type_compiler = compiler.GenericTypeCompiler
preparer = compiler.IdentifierPreparer
supports_alter = True
# the first value we'd get for an autoincrement
# column.
default_sequence_base = 1
# most DBAPIs happy with this for execute().
# not cx_oracle.
execute_sequence_format = tuple
supports_views = True
supports_sequences = False
sequences_optional = False
preexecute_autoincrement_sequences = False
postfetch_lastrowid = True
implicit_returning = False
supports_native_enum = False
supports_native_boolean = False
# if the NUMERIC type
# returns decimal.Decimal.
# *not* the FLOAT type however.
supports_native_decimal = False
# Py3K
#supports_unicode_statements = True
#supports_unicode_binds = True
#returns_unicode_strings = True
#description_encoding = None
# Py2K
supports_unicode_statements = False
supports_unicode_binds = False
returns_unicode_strings = False
description_encoding = 'use_encoding'
# end Py2K
name = 'default'
# length at which to truncate
# any identifier.
max_identifier_length = 9999
# length at which to truncate
# the name of an index.
# Usually None to indicate
# 'use max_identifier_length'.
# thanks to MySQL, sigh
max_index_name_length = None
supports_sane_rowcount = True
supports_sane_multi_rowcount = True
dbapi_type_map = {}
colspecs = {}
default_paramstyle = 'named'
supports_default_values = False
supports_empty_insert = True
supports_multivalues_insert = False
server_version_info = None
# indicates symbol names are
# UPPERCASEd if they are case insensitive
# within the database.
# if this is True, the methods normalize_name()
# and denormalize_name() must be provided.
requires_name_normalize = False
reflection_options = ()
def __init__(self, convert_unicode=False,
encoding='utf-8', paramstyle=None, dbapi=None,
implicit_returning=None,
case_sensitive=True,
label_length=None, **kwargs):
if not getattr(self, 'ported_sqla_06', True):
util.warn(
"The %s dialect is not yet ported to the 0.6 format" %
self.name)
self.convert_unicode = convert_unicode
self.encoding = encoding
self.positional = False
self._ischema = None
self.dbapi = dbapi
if paramstyle is not None:
self.paramstyle = paramstyle
elif self.dbapi is not None:
self.paramstyle = self.dbapi.paramstyle
else:
self.paramstyle = self.default_paramstyle
if implicit_returning is not None:
self.implicit_returning = implicit_returning
self.positional = self.paramstyle in ('qmark', 'format', 'numeric')
self.identifier_preparer = self.preparer(self)
self.type_compiler = self.type_compiler(self)
self.case_sensitive = case_sensitive
if label_length and label_length > self.max_identifier_length:
raise exc.ArgumentError(
"Label length of %d is greater than this dialect's"
" maximum identifier length of %d" %
(label_length, self.max_identifier_length))
self.label_length = label_length
if self.description_encoding == 'use_encoding':
self._description_decoder = \
processors.to_unicode_processor_factory(
encoding
)
elif self.description_encoding is not None:
self._description_decoder = \
processors.to_unicode_processor_factory(
self.description_encoding
)
self._encoder = codecs.getencoder(self.encoding)
self._decoder = processors.to_unicode_processor_factory(self.encoding)
@util.memoized_property
def _type_memos(self):
return weakref.WeakKeyDictionary()
@property
def dialect_description(self):
return self.name + "+" + self.driver
@classmethod
def get_pool_class(cls, url):
return getattr(cls, 'poolclass', pool.QueuePool)
def initialize(self, connection):
try:
self.server_version_info = \
self._get_server_version_info(connection)
except NotImplementedError:
self.server_version_info = None
try:
self.default_schema_name = \
self._get_default_schema_name(connection)
except NotImplementedError:
self.default_schema_name = None
try:
self.default_isolation_level = \
self.get_isolation_level(connection.connection)
except NotImplementedError:
self.default_isolation_level = None
self.returns_unicode_strings = self._check_unicode_returns(connection)
self.do_rollback(connection.connection)
def on_connect(self):
"""return a callable which sets up a newly created DBAPI connection.
This is used to set dialect-wide per-connection options such as
isolation modes, unicode modes, etc.
If a callable is returned, it will be assembled into a pool listener
that receives the direct DBAPI connection, with all wrappers removed.
If None is returned, no listener will be generated.
"""
return None
def _check_unicode_returns(self, connection):
# Py2K
if self.supports_unicode_statements:
cast_to = unicode
else:
cast_to = str
# end Py2K
# Py3K
#cast_to = str
def check_unicode(formatstr, type_):
cursor = connection.connection.cursor()
try:
try:
cursor.execute(
cast_to(
expression.select(
[expression.cast(
expression.literal_column(
"'test %s returns'" % formatstr),
type_)
]).compile(dialect=self)
)
)
row = cursor.fetchone()
return isinstance(row[0], unicode)
except self.dbapi.Error, de:
util.warn("Exception attempting to "
"detect unicode returns: %r" % de)
return False
finally:
cursor.close()
# detect plain VARCHAR
unicode_for_varchar = check_unicode("plain", sqltypes.VARCHAR(60))
# detect if there's an NVARCHAR type with different behavior available
unicode_for_unicode = check_unicode("unicode", sqltypes.Unicode(60))
if unicode_for_unicode and not unicode_for_varchar:
return "conditional"
else:
return unicode_for_varchar
def type_descriptor(self, typeobj):
"""Provide a database-specific :class:`.TypeEngine` object, given
the generic object which comes from the types module.
This method looks for a dictionary called
``colspecs`` as a class or instance-level variable,
and passes on to :func:`.types.adapt_type`.
"""
return sqltypes.adapt_type(typeobj, self.colspecs)
def reflecttable(self, connection, table, include_columns,
exclude_columns=None):
insp = reflection.Inspector.from_engine(connection)
return insp.reflecttable(table, include_columns, exclude_columns)
def get_pk_constraint(self, conn, table_name, schema=None, **kw):
"""Compatibility method, adapts the result of get_primary_keys()
for those dialects which don't implement get_pk_constraint().
"""
return {
'constrained_columns':
self.get_primary_keys(conn, table_name,
schema=schema, **kw)
}
def validate_identifier(self, ident):
if len(ident) > self.max_identifier_length:
raise exc.IdentifierError(
"Identifier '%s' exceeds maximum length of %d characters" %
(ident, self.max_identifier_length)
)
def connect(self, *cargs, **cparams):
return self.dbapi.connect(*cargs, **cparams)
def create_connect_args(self, url):
opts = url.translate_connect_args()
opts.update(url.query)
return [[], opts]
def do_begin(self, dbapi_connection):
pass
def do_rollback(self, dbapi_connection):
dbapi_connection.rollback()
def do_commit(self, dbapi_connection):
dbapi_connection.commit()
def do_close(self, dbapi_connection):
dbapi_connection.close()
def create_xid(self):
"""Create a random two-phase transaction ID.
This id will be passed to do_begin_twophase(), do_rollback_twophase(),
do_commit_twophase(). Its format is unspecified.
"""
return "_sa_%032x" % random.randint(0, 2 ** 128)
def do_savepoint(self, connection, name):
connection.execute(expression.SavepointClause(name))
def do_rollback_to_savepoint(self, connection, name):
connection.execute(expression.RollbackToSavepointClause(name))
def do_release_savepoint(self, connection, name):
connection.execute(expression.ReleaseSavepointClause(name))
def do_executemany(self, cursor, statement, parameters, context=None):
cursor.executemany(statement, parameters)
def do_execute(self, cursor, statement, parameters, context=None):
cursor.execute(statement, parameters)
def do_execute_no_params(self, cursor, statement, context=None):
cursor.execute(statement)
def is_disconnect(self, e, connection, cursor):
return False
def reset_isolation_level(self, dbapi_conn):
# default_isolation_level is read from the first connection
# after the initial set of 'isolation_level', if any, so is
# the configured default of this dialect.
self.set_isolation_level(dbapi_conn, self.default_isolation_level)
class DefaultExecutionContext(interfaces.ExecutionContext):
isinsert = False
isupdate = False
isdelete = False
isddl = False
executemany = False
result_map = None
compiled = None
statement = None
postfetch_cols = None
prefetch_cols = None
_is_implicit_returning = False
_is_explicit_returning = False
# a hook for SQLite's translation of
# result column names
_translate_colname = None
@classmethod
def _init_ddl(cls, dialect, connection, dbapi_connection, compiled_ddl):
"""Initialize execution context for a DDLElement construct."""
self = cls.__new__(cls)
self.dialect = dialect
self.root_connection = connection
self._dbapi_connection = dbapi_connection
self.engine = connection.engine
self.compiled = compiled = compiled_ddl
self.isddl = True
self.execution_options = compiled.statement._execution_options
if connection._execution_options:
self.execution_options = dict(self.execution_options)
self.execution_options.update(connection._execution_options)
if not dialect.supports_unicode_statements:
self.unicode_statement = unicode(compiled)
self.statement = dialect._encoder(self.unicode_statement)[0]
else:
self.statement = self.unicode_statement = unicode(compiled)
self.cursor = self.create_cursor()
self.compiled_parameters = []
if dialect.positional:
self.parameters = [dialect.execute_sequence_format()]
else:
self.parameters = [{}]
return self
@classmethod
def _init_compiled(cls, dialect, connection, dbapi_connection,
compiled, parameters):
"""Initialize execution context for a Compiled construct."""
self = cls.__new__(cls)
self.dialect = dialect
self.root_connection = connection
self._dbapi_connection = dbapi_connection
self.engine = connection.engine
self.compiled = compiled
if not compiled.can_execute:
raise exc.ArgumentError("Not an executable clause")
self.execution_options = compiled.statement._execution_options
if connection._execution_options:
self.execution_options = dict(self.execution_options)
self.execution_options.update(connection._execution_options)
# compiled clauseelement. process bind params, process table defaults,
# track collections used by ResultProxy to target and process results
self.result_map = compiled.result_map
self.unicode_statement = unicode(compiled)
if not dialect.supports_unicode_statements:
self.statement = self.unicode_statement.encode(
self.dialect.encoding)
else:
self.statement = self.unicode_statement
self.isinsert = compiled.isinsert
self.isupdate = compiled.isupdate
self.isdelete = compiled.isdelete
if self.isinsert or self.isupdate or self.isdelete:
self._is_explicit_returning = bool(compiled.statement._returning)
self._is_implicit_returning = bool(compiled.returning and \
not compiled.statement._returning)
if not parameters:
self.compiled_parameters = [compiled.construct_params()]
else:
self.compiled_parameters = \
[compiled.construct_params(m, _group_number=grp) for
grp, m in enumerate(parameters)]
self.executemany = len(parameters) > 1
self.cursor = self.create_cursor()
if self.isinsert or self.isupdate:
self.postfetch_cols = self.compiled.postfetch
self.prefetch_cols = self.compiled.prefetch
self.__process_defaults()
processors = compiled._bind_processors
# Convert the dictionary of bind parameter values
# into a dict or list to be sent to the DBAPI's
# execute() or executemany() method.
parameters = []
if dialect.positional:
for compiled_params in self.compiled_parameters:
param = []
for key in self.compiled.positiontup:
if key in processors:
param.append(processors[key](compiled_params[key]))
else:
param.append(compiled_params[key])
parameters.append(dialect.execute_sequence_format(param))
else:
encode = not dialect.supports_unicode_statements
for compiled_params in self.compiled_parameters:
param = {}
if encode:
for key in compiled_params:
if key in processors:
param[dialect._encoder(key)[0]] = \
processors[key](compiled_params[key])
else:
param[dialect._encoder(key)[0]] = \
compiled_params[key]
else:
for key in compiled_params:
if key in processors:
param[key] = processors[key](compiled_params[key])
else:
param[key] = compiled_params[key]
parameters.append(param)
self.parameters = dialect.execute_sequence_format(parameters)
return self
@classmethod
def _init_statement(cls, dialect, connection, dbapi_connection,
statement, parameters):
"""Initialize execution context for a string SQL statement."""
self = cls.__new__(cls)
self.dialect = dialect
self.root_connection = connection
self._dbapi_connection = dbapi_connection
self.engine = connection.engine
# plain text statement
self.execution_options = connection._execution_options
if not parameters:
if self.dialect.positional:
self.parameters = [dialect.execute_sequence_format()]
else:
self.parameters = [{}]
elif isinstance(parameters[0], dialect.execute_sequence_format):
self.parameters = parameters
elif isinstance(parameters[0], dict):
if dialect.supports_unicode_statements:
self.parameters = parameters
else:
self.parameters = [
dict((dialect._encoder(k)[0], d[k]) for k in d)
for d in parameters
] or [{}]
else:
self.parameters = [dialect.execute_sequence_format(p)
for p in parameters]
self.executemany = len(parameters) > 1
if not dialect.supports_unicode_statements and \
isinstance(statement, unicode):
self.unicode_statement = statement
self.statement = dialect._encoder(statement)[0]
else:
self.statement = self.unicode_statement = statement
self.cursor = self.create_cursor()
return self
@classmethod
def _init_default(cls, dialect, connection, dbapi_connection):
"""Initialize execution context for a ColumnDefault construct."""
self = cls.__new__(cls)
self.dialect = dialect
self.root_connection = connection
self._dbapi_connection = dbapi_connection
self.engine = connection.engine
self.execution_options = connection._execution_options
self.cursor = self.create_cursor()
return self
@util.memoized_property
def no_parameters(self):
return self.execution_options.get("no_parameters", False)
@util.memoized_property
def is_crud(self):
return self.isinsert or self.isupdate or self.isdelete
@util.memoized_property
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
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