/usr/share/pyshared/sqlalchemy/dialects/access/base.py is in python-sqlalchemy 0.7.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 | # access/base.py
# Copyright (C) 2007-2011 the SQLAlchemy authors and contributors <see AUTHORS file>
# Copyright (C) 2007 Paul Johnston, paj@pajhome.org.uk
# Portions derived from jet2sql.py by Matt Keranen, mksql@yahoo.com
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""
Support for the Microsoft Access database.
This dialect is *not* ported to SQLAlchemy 0.6 or 0.7.
This dialect is *not* tested on SQLAlchemy 0.6 or 0.7.
"""
from sqlalchemy import sql, schema, types, exc, pool
from sqlalchemy.sql import compiler, expression
from sqlalchemy.engine import default, base, reflection
from sqlalchemy import processors
class AcNumeric(types.Numeric):
def get_col_spec(self):
return "NUMERIC"
def bind_processor(self, dialect):
return processors.to_str
def result_processor(self, dialect, coltype):
return None
class AcFloat(types.Float):
def get_col_spec(self):
return "FLOAT"
def bind_processor(self, dialect):
"""By converting to string, we can use Decimal types round-trip."""
return processors.to_str
class AcInteger(types.Integer):
def get_col_spec(self):
return "INTEGER"
class AcTinyInteger(types.Integer):
def get_col_spec(self):
return "TINYINT"
class AcSmallInteger(types.SmallInteger):
def get_col_spec(self):
return "SMALLINT"
class AcDateTime(types.DateTime):
def get_col_spec(self):
return "DATETIME"
class AcDate(types.Date):
def get_col_spec(self):
return "DATETIME"
class AcText(types.Text):
def get_col_spec(self):
return "MEMO"
class AcString(types.String):
def get_col_spec(self):
return "TEXT" + (self.length and ("(%d)" % self.length) or "")
class AcUnicode(types.Unicode):
def get_col_spec(self):
return "TEXT" + (self.length and ("(%d)" % self.length) or "")
def bind_processor(self, dialect):
return None
def result_processor(self, dialect, coltype):
return None
class AcChar(types.CHAR):
def get_col_spec(self):
return "TEXT" + (self.length and ("(%d)" % self.length) or "")
class AcBinary(types.LargeBinary):
def get_col_spec(self):
return "BINARY"
class AcBoolean(types.Boolean):
def get_col_spec(self):
return "YESNO"
class AcTimeStamp(types.TIMESTAMP):
def get_col_spec(self):
return "TIMESTAMP"
class AccessExecutionContext(default.DefaultExecutionContext):
def _has_implicit_sequence(self, column):
if column.primary_key and column.autoincrement:
if isinstance(column.type, types.Integer) and \
not column.foreign_keys:
if column.default is None or \
(isinstance(column.default, schema.Sequence) and \
column.default.optional):
return True
return False
def post_exec(self):
"""If we inserted into a row with a COUNTER column, fetch the ID"""
if self.compiled.isinsert:
tbl = self.compiled.statement.table
if not hasattr(tbl, 'has_sequence'):
tbl.has_sequence = None
for column in tbl.c:
if getattr(column, 'sequence', False) or \
self._has_implicit_sequence(column):
tbl.has_sequence = column
break
if bool(tbl.has_sequence):
# TBD: for some reason _last_inserted_ids doesn't exist here
# (but it does at corresponding point in mssql???)
#if not len(self._last_inserted_ids) or
# self._last_inserted_ids[0] is None:
self.cursor.execute("SELECT @@identity AS lastrowid")
row = self.cursor.fetchone()
self._last_inserted_ids = [int(row[0])]
#+ self._last_inserted_ids[1:]
# print "LAST ROW ID", self._last_inserted_ids
super(AccessExecutionContext, self).post_exec()
const, daoEngine = None, None
class AccessDialect(default.DefaultDialect):
colspecs = {
types.Unicode : AcUnicode,
types.Integer : AcInteger,
types.SmallInteger: AcSmallInteger,
types.Numeric : AcNumeric,
types.Float : AcFloat,
types.DateTime : AcDateTime,
types.Date : AcDate,
types.String : AcString,
types.LargeBinary : AcBinary,
types.Boolean : AcBoolean,
types.Text : AcText,
types.CHAR: AcChar,
types.TIMESTAMP: AcTimeStamp,
}
name = 'access'
supports_sane_rowcount = False
supports_sane_multi_rowcount = False
ported_sqla_06 = False
def type_descriptor(self, typeobj):
newobj = types.adapt_type(typeobj, self.colspecs)
return newobj
def __init__(self, **params):
super(AccessDialect, self).__init__(**params)
self.text_as_varchar = False
self._dtbs = None
@classmethod
def dbapi(cls):
import win32com.client, pythoncom
global const, daoEngine
if const is None:
const = win32com.client.constants
for suffix in (".36", ".35", ".30"):
try:
daoEngine = win32com.client.\
gencache.\
EnsureDispatch("DAO.DBEngine" + suffix)
break
except pythoncom.com_error:
pass
else:
raise exc.InvalidRequestError(
"Can't find a DB engine. Check "
"http://support.microsoft.com/kb/239114 for details.")
import pyodbc as module
return module
def create_connect_args(self, url):
opts = url.translate_connect_args()
connectors = ["Driver={Microsoft Access Driver (*.mdb)}"]
connectors.append("Dbq=%s" % opts["database"])
user = opts.get("username", None)
if user:
connectors.append("UID=%s" % user)
connectors.append("PWD=%s" % opts.get("password", ""))
return [[";".join(connectors)], {}]
def last_inserted_ids(self):
return self.context.last_inserted_ids
def do_execute(self, cursor, statement, params, context=None):
if params == {}:
params = ()
super(AccessDialect, self).\
do_execute(cursor, statement, params, **kwargs)
def _execute(self, c, statement, parameters):
try:
if parameters == {}:
parameters = ()
c.execute(statement, parameters)
self.context.rowcount = c.rowcount
except Exception, e:
raise exc.DBAPIError.instance(statement, parameters, e)
def has_table(self, connection, tablename, schema=None):
# This approach seems to be more reliable that using DAO
try:
connection.execute('select top 1 * from [%s]' % tablename)
return True
except Exception, e:
return False
def reflecttable(self, connection, table, include_columns):
# This is defined in the function, as it relies on win32com constants,
# that aren't imported until dbapi method is called
if not hasattr(self, 'ischema_names'):
self.ischema_names = {
const.dbByte: AcBinary,
const.dbInteger: AcInteger,
const.dbLong: AcInteger,
const.dbSingle: AcFloat,
const.dbDouble: AcFloat,
const.dbDate: AcDateTime,
const.dbLongBinary: AcBinary,
const.dbMemo: AcText,
const.dbBoolean: AcBoolean,
const.dbText: AcUnicode, # All Access strings are
# unicode
const.dbCurrency: AcNumeric,
}
# A fresh DAO connection is opened for each reflection
# This is necessary, so we get the latest updates
dtbs = daoEngine.OpenDatabase(connection.engine.url.database)
try:
for tbl in dtbs.TableDefs:
if tbl.Name.lower() == table.name.lower():
break
else:
raise exc.NoSuchTableError(table.name)
for col in tbl.Fields:
coltype = self.ischema_names[col.Type]
if col.Type == const.dbText:
coltype = coltype(col.Size)
colargs = \
{
'nullable': not(col.Required or
col.Attributes & const.dbAutoIncrField),
}
default = col.DefaultValue
if col.Attributes & const.dbAutoIncrField:
colargs['default'] = schema.Sequence(col.Name + '_seq')
elif default:
if col.Type == const.dbBoolean:
default = default == 'Yes' and '1' or '0'
colargs['server_default'] = \
schema.DefaultClause(sql.text(default))
table.append_column(
schema.Column(col.Name, coltype, **colargs))
# TBD: check constraints
# Find primary key columns first
for idx in tbl.Indexes:
if idx.Primary:
for col in idx.Fields:
thecol = table.c[col.Name]
table.primary_key.add(thecol)
if isinstance(thecol.type, AcInteger) and \
not (thecol.default and
isinstance(
thecol.default.arg,
schema.Sequence
)):
thecol.autoincrement = False
# Then add other indexes
for idx in tbl.Indexes:
if not idx.Primary:
if len(idx.Fields) == 1:
col = table.c[idx.Fields[0].Name]
if not col.primary_key:
col.index = True
col.unique = idx.Unique
else:
pass # TBD: multi-column indexes
for fk in dtbs.Relations:
if fk.ForeignTable != table.name:
continue
scols = [c.ForeignName for c in fk.Fields]
rcols = ['%s.%s' % (fk.Table, c.Name) for c in fk.Fields]
table.append_constraint(
schema.ForeignKeyConstraint(scols, rcols,\
link_to_name=True))
finally:
dtbs.Close()
@reflection.cache
def get_table_names(self, connection, schema=None, **kw):
# A fresh DAO connection is opened for each reflection
# This is necessary, so we get the latest updates
dtbs = daoEngine.OpenDatabase(connection.engine.url.database)
names = [t.Name for t in dtbs.TableDefs
if t.Name[:4] != "MSys" and t.Name[:4] != "~TMP"]
dtbs.Close()
return names
class AccessCompiler(compiler.SQLCompiler):
extract_map = compiler.SQLCompiler.extract_map.copy()
extract_map.update ({
'month': 'm',
'day': 'd',
'year': 'yyyy',
'second': 's',
'hour': 'h',
'doy': 'y',
'minute': 'n',
'quarter': 'q',
'dow': 'w',
'week': 'ww'
})
def visit_select_precolumns(self, select):
"""Access puts TOP, it's version of LIMIT here """
s = select.distinct and "DISTINCT " or ""
if select.limit:
s += "TOP %s " % (select.limit)
if select.offset:
raise exc.InvalidRequestError(
'Access does not support LIMIT with an offset')
return s
def limit_clause(self, select):
"""Limit in access is after the select keyword"""
return ""
def binary_operator_string(self, binary):
"""Access uses "mod" instead of "%" """
return binary.operator == '%' and 'mod' or binary.operator
def label_select_column(self, select, column, asfrom):
if isinstance(column, expression.Function):
return column.label()
else:
return super(AccessCompiler, self).\
label_select_column(select, column, asfrom)
function_rewrites = {'current_date': 'now',
'current_timestamp': 'now',
'length': 'len',
}
def visit_function(self, func):
"""Access function names differ from the ANSI SQL names;
rewrite common ones"""
func.name = self.function_rewrites.get(func.name, func.name)
return super(AccessCompiler, self).visit_function(func)
def for_update_clause(self, select):
"""FOR UPDATE is not supported by Access; silently ignore"""
return ''
# Strip schema
def visit_table(self, table, asfrom=False, **kwargs):
if asfrom:
return self.preparer.quote(table.name, table.quote)
else:
return ""
def visit_join(self, join, asfrom=False, **kwargs):
return (self.process(join.left, asfrom=True) + \
(join.isouter and " LEFT OUTER JOIN " or " INNER JOIN ") + \
self.process(join.right, asfrom=True) + " ON " + \
self.process(join.onclause))
def visit_extract(self, extract, **kw):
field = self.extract_map.get(extract.field, extract.field)
return 'DATEPART("%s", %s)' % \
(field, self.process(extract.expr, **kw))
class AccessDDLCompiler(compiler.DDLCompiler):
def get_column_specification(self, column, **kwargs):
colspec = self.preparer.format_column(column) + " " + \
column.type.dialect_impl(self.dialect).get_col_spec()
# install a sequence if we have an implicit IDENTITY column
if (not getattr(column.table, 'has_sequence', False)) and \
column.primary_key and \
column.autoincrement and \
isinstance(column.type, types.Integer) and \
not column.foreign_keys:
if column.default is None or \
(isinstance(column.default, schema.Sequence) and
column.default.optional):
column.sequence = schema.Sequence(column.name + '_seq')
if not column.nullable:
colspec += " NOT NULL"
if hasattr(column, 'sequence'):
column.table.has_sequence = column
colspec = self.preparer.format_column(column) + " counter"
else:
default = self.get_column_default_string(column)
if default is not None:
colspec += " DEFAULT " + default
return colspec
def visit_drop_index(self, drop):
index = drop.element
self.append("\nDROP INDEX [%s].[%s]" % \
(index.table.name,
self._index_identifier(index.name)))
class AccessIdentifierPreparer(compiler.IdentifierPreparer):
reserved_words = compiler.RESERVED_WORDS.copy()
reserved_words.update(['value', 'text'])
def __init__(self, dialect):
super(AccessIdentifierPreparer, self).\
__init__(dialect, initial_quote='[', final_quote=']')
dialect = AccessDialect
dialect.poolclass = pool.SingletonThreadPool
dialect.statement_compiler = AccessCompiler
dialect.ddlcompiler = AccessDDLCompiler
dialect.preparer = AccessIdentifierPreparer
dialect.execution_ctx_cls = AccessExecutionContext
|