/usr/lib/python2.7/dist-packages/sqlalchemy/engine/result.py is in python-sqlalchemy 0.9.8+dfsg-0.1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 | # engine/result.py
# Copyright (C) 2005-2014 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
"""Define result set constructs including :class:`.ResultProxy`
and :class:`.RowProxy."""
from .. import exc, util
from ..sql import expression, sqltypes
import collections
import operator
# This reconstructor is necessary so that pickles with the C extension or
# without use the same Binary format.
try:
# We need a different reconstructor on the C extension so that we can
# add extra checks that fields have correctly been initialized by
# __setstate__.
from sqlalchemy.cresultproxy import safe_rowproxy_reconstructor
# The extra function embedding is needed so that the
# reconstructor function has the same signature whether or not
# the extension is present.
def rowproxy_reconstructor(cls, state):
return safe_rowproxy_reconstructor(cls, state)
except ImportError:
def rowproxy_reconstructor(cls, state):
obj = cls.__new__(cls)
obj.__setstate__(state)
return obj
try:
from sqlalchemy.cresultproxy import BaseRowProxy
except ImportError:
class BaseRowProxy(object):
__slots__ = ('_parent', '_row', '_processors', '_keymap')
def __init__(self, parent, row, processors, keymap):
"""RowProxy objects are constructed by ResultProxy objects."""
self._parent = parent
self._row = row
self._processors = processors
self._keymap = keymap
def __reduce__(self):
return (rowproxy_reconstructor,
(self.__class__, self.__getstate__()))
def values(self):
"""Return the values represented by this RowProxy as a list."""
return list(self)
def __iter__(self):
for processor, value in zip(self._processors, self._row):
if processor is None:
yield value
else:
yield processor(value)
def __len__(self):
return len(self._row)
def __getitem__(self, key):
try:
processor, obj, index = self._keymap[key]
except KeyError:
processor, obj, index = self._parent._key_fallback(key)
except TypeError:
if isinstance(key, slice):
l = []
for processor, value in zip(self._processors[key],
self._row[key]):
if processor is None:
l.append(value)
else:
l.append(processor(value))
return tuple(l)
else:
raise
if index is None:
raise exc.InvalidRequestError(
"Ambiguous column name '%s' in result set! "
"try 'use_labels' option on select statement." % key)
if processor is not None:
return processor(self._row[index])
else:
return self._row[index]
def __getattr__(self, name):
try:
return self[name]
except KeyError as e:
raise AttributeError(e.args[0])
class RowProxy(BaseRowProxy):
"""Proxy values from a single cursor row.
Mostly follows "ordered dictionary" behavior, mapping result
values to the string-based column name, the integer position of
the result in the row, as well as Column instances which can be
mapped to the original Columns that produced this result set (for
results that correspond to constructed SQL expressions).
"""
__slots__ = ()
def __contains__(self, key):
return self._parent._has_key(self._row, key)
def __getstate__(self):
return {
'_parent': self._parent,
'_row': tuple(self)
}
def __setstate__(self, state):
self._parent = parent = state['_parent']
self._row = state['_row']
self._processors = parent._processors
self._keymap = parent._keymap
__hash__ = None
def _op(self, other, op):
return op(tuple(self), tuple(other)) \
if isinstance(other, RowProxy) \
else op(tuple(self), other)
def __lt__(self, other):
return self._op(other, operator.lt)
def __le__(self, other):
return self._op(other, operator.le)
def __ge__(self, other):
return self._op(other, operator.ge)
def __gt__(self, other):
return self._op(other, operator.gt)
def __eq__(self, other):
return self._op(other, operator.eq)
def __ne__(self, other):
return self._op(other, operator.ne)
def __repr__(self):
return repr(tuple(self))
def has_key(self, key):
"""Return True if this RowProxy contains the given key."""
return self._parent._has_key(self._row, key)
def items(self):
"""Return a list of tuples, each tuple containing a key/value pair."""
# TODO: no coverage here
return [(key, self[key]) for key in self.keys()]
def keys(self):
"""Return the list of keys as strings represented by this RowProxy."""
return self._parent.keys
def iterkeys(self):
return iter(self._parent.keys)
def itervalues(self):
return iter(self)
try:
# Register RowProxy with Sequence,
# so sequence protocol is implemented
from collections import Sequence
Sequence.register(RowProxy)
except ImportError:
pass
class ResultMetaData(object):
"""Handle cursor.description, applying additional info from an execution
context."""
def __init__(self, parent, metadata):
self._processors = processors = []
# We do not strictly need to store the processor in the key mapping,
# though it is faster in the Python version (probably because of the
# saved attribute lookup self._processors)
self._keymap = keymap = {}
self.keys = []
context = parent.context
dialect = context.dialect
typemap = dialect.dbapi_type_map
translate_colname = context._translate_colname
self.case_sensitive = dialect.case_sensitive
# high precedence key values.
primary_keymap = {}
for i, rec in enumerate(metadata):
colname = rec[0]
coltype = rec[1]
if dialect.description_encoding:
colname = dialect._description_decoder(colname)
if translate_colname:
colname, untranslated = translate_colname(colname)
if dialect.requires_name_normalize:
colname = dialect.normalize_name(colname)
if context.result_map:
try:
name, obj, type_ = context.result_map[
colname if self.case_sensitive else colname.lower()]
except KeyError:
name, obj, type_ = \
colname, None, typemap.get(coltype, sqltypes.NULLTYPE)
else:
name, obj, type_ = \
colname, None, typemap.get(coltype, sqltypes.NULLTYPE)
processor = context.get_result_processor(type_, colname, coltype)
processors.append(processor)
rec = (processor, obj, i)
# indexes as keys. This is only needed for the Python version of
# RowProxy (the C version uses a faster path for integer indexes).
primary_keymap[i] = rec
# populate primary keymap, looking for conflicts.
if primary_keymap.setdefault(
name if self.case_sensitive
else name.lower(),
rec) is not rec:
# place a record that doesn't have the "index" - this
# is interpreted later as an AmbiguousColumnError,
# but only when actually accessed. Columns
# colliding by name is not a problem if those names
# aren't used; integer access is always
# unambiguous.
primary_keymap[name
if self.case_sensitive
else name.lower()] = rec = (None, obj, None)
self.keys.append(colname)
if obj:
for o in obj:
keymap[o] = rec
# technically we should be doing this but we
# are saving on callcounts by not doing so.
# if keymap.setdefault(o, rec) is not rec:
# keymap[o] = (None, obj, None)
if translate_colname and \
untranslated:
keymap[untranslated] = rec
# overwrite keymap values with those of the
# high precedence keymap.
keymap.update(primary_keymap)
if parent._echo:
context.engine.logger.debug(
"Col %r", tuple(x[0] for x in metadata))
@util.pending_deprecation("0.8", "sqlite dialect uses "
"_translate_colname() now")
def _set_keymap_synonym(self, name, origname):
"""Set a synonym for the given name.
Some dialects (SQLite at the moment) may use this to
adjust the column names that are significant within a
row.
"""
rec = (processor, obj, i) = self._keymap[origname if
self.case_sensitive
else origname.lower()]
if self._keymap.setdefault(name, rec) is not rec:
self._keymap[name] = (processor, obj, None)
def _key_fallback(self, key, raiseerr=True):
map = self._keymap
result = None
if isinstance(key, util.string_types):
result = map.get(key if self.case_sensitive else key.lower())
# fallback for targeting a ColumnElement to a textual expression
# this is a rare use case which only occurs when matching text()
# or colummn('name') constructs to ColumnElements, or after a
# pickle/unpickle roundtrip
elif isinstance(key, expression.ColumnElement):
if key._label and (
key._label
if self.case_sensitive
else key._label.lower()) in map:
result = map[key._label
if self.case_sensitive
else key._label.lower()]
elif hasattr(key, 'name') and (
key.name
if self.case_sensitive
else key.name.lower()) in map:
# match is only on name.
result = map[key.name
if self.case_sensitive
else key.name.lower()]
# search extra hard to make sure this
# isn't a column/label name overlap.
# this check isn't currently available if the row
# was unpickled.
if result is not None and \
result[1] is not None:
for obj in result[1]:
if key._compare_name_for_result(obj):
break
else:
result = None
if result is None:
if raiseerr:
raise exc.NoSuchColumnError(
"Could not locate column in row for column '%s'" %
expression._string_or_unprintable(key))
else:
return None
else:
map[key] = result
return result
def _has_key(self, row, key):
if key in self._keymap:
return True
else:
return self._key_fallback(key, False) is not None
def __getstate__(self):
return {
'_pickled_keymap': dict(
(key, index)
for key, (processor, obj, index) in self._keymap.items()
if isinstance(key, util.string_types + util.int_types)
),
'keys': self.keys,
"case_sensitive": self.case_sensitive,
}
def __setstate__(self, state):
# the row has been processed at pickling time so we don't need any
# processor anymore
self._processors = [None for _ in range(len(state['keys']))]
self._keymap = keymap = {}
for key, index in state['_pickled_keymap'].items():
# not preserving "obj" here, unfortunately our
# proxy comparison fails with the unpickle
keymap[key] = (None, None, index)
self.keys = state['keys']
self.case_sensitive = state['case_sensitive']
self._echo = False
class ResultProxy(object):
"""Wraps a DB-API cursor object to provide easier access to row columns.
Individual columns may be accessed by their integer position,
case-insensitive column name, or by ``schema.Column``
object. e.g.::
row = fetchone()
col1 = row[0] # access via integer position
col2 = row['col2'] # access via name
col3 = row[mytable.c.mycol] # access via Column object.
``ResultProxy`` also handles post-processing of result column
data using ``TypeEngine`` objects, which are referenced from
the originating SQL statement that produced this result set.
"""
_process_row = RowProxy
out_parameters = None
_can_close_connection = False
_metadata = None
def __init__(self, context):
self.context = context
self.dialect = context.dialect
self.closed = False
self.cursor = self._saved_cursor = context.cursor
self.connection = context.root_connection
self._echo = self.connection._echo and \
context.engine._should_log_debug()
self._init_metadata()
def _init_metadata(self):
metadata = self._cursor_description()
if metadata is not None:
self._metadata = ResultMetaData(self, metadata)
def keys(self):
"""Return the current set of string keys for rows."""
if self._metadata:
return self._metadata.keys
else:
return []
@util.memoized_property
def rowcount(self):
"""Return the 'rowcount' for this result.
The 'rowcount' reports the number of rows *matched*
by the WHERE criterion of an UPDATE or DELETE statement.
.. note::
Notes regarding :attr:`.ResultProxy.rowcount`:
* This attribute returns the number of rows *matched*,
which is not necessarily the same as the number of rows
that were actually *modified* - an UPDATE statement, for example,
may have no net change on a given row if the SET values
given are the same as those present in the row already.
Such a row would be matched but not modified.
On backends that feature both styles, such as MySQL,
rowcount is configured by default to return the match
count in all cases.
* :attr:`.ResultProxy.rowcount` is *only* useful in conjunction
with an UPDATE or DELETE statement. Contrary to what the Python
DBAPI says, it does *not* return the
number of rows available from the results of a SELECT statement
as DBAPIs cannot support this functionality when rows are
unbuffered.
* :attr:`.ResultProxy.rowcount` may not be fully implemented by
all dialects. In particular, most DBAPIs do not support an
aggregate rowcount result from an executemany call.
The :meth:`.ResultProxy.supports_sane_rowcount` and
:meth:`.ResultProxy.supports_sane_multi_rowcount` methods
will report from the dialect if each usage is known to be
supported.
* Statements that use RETURNING may not return a correct
rowcount.
"""
try:
return self.context.rowcount
except Exception as e:
self.connection._handle_dbapi_exception(
e, None, None, self.cursor, self.context)
@property
def lastrowid(self):
"""return the 'lastrowid' accessor on the DBAPI cursor.
This is a DBAPI specific method and is only functional
for those backends which support it, for statements
where it is appropriate. It's behavior is not
consistent across backends.
Usage of this method is normally unnecessary when
using insert() expression constructs; the
:attr:`~ResultProxy.inserted_primary_key` attribute provides a
tuple of primary key values for a newly inserted row,
regardless of database backend.
"""
try:
return self._saved_cursor.lastrowid
except Exception as e:
self.connection._handle_dbapi_exception(
e, None, None,
self._saved_cursor, self.context)
@property
def returns_rows(self):
"""True if this :class:`.ResultProxy` returns rows.
I.e. if it is legal to call the methods
:meth:`~.ResultProxy.fetchone`,
:meth:`~.ResultProxy.fetchmany`
:meth:`~.ResultProxy.fetchall`.
"""
return self._metadata is not None
@property
def is_insert(self):
"""True if this :class:`.ResultProxy` is the result
of a executing an expression language compiled
:func:`.expression.insert` construct.
When True, this implies that the
:attr:`inserted_primary_key` attribute is accessible,
assuming the statement did not include
a user defined "returning" construct.
"""
return self.context.isinsert
def _cursor_description(self):
"""May be overridden by subclasses."""
return self._saved_cursor.description
def close(self, _autoclose_connection=True):
"""Close this ResultProxy.
Closes the underlying DBAPI cursor corresponding to the execution.
Note that any data cached within this ResultProxy is still available.
For some types of results, this may include buffered rows.
If this ResultProxy was generated from an implicit execution,
the underlying Connection will also be closed (returns the
underlying DBAPI connection to the connection pool.)
This method is called automatically when:
* all result rows are exhausted using the fetchXXX() methods.
* cursor.description is None.
"""
if not self.closed:
self.closed = True
self.connection._safe_close_cursor(self.cursor)
if _autoclose_connection and \
self.connection.should_close_with_result:
self.connection.close()
# allow consistent errors
self.cursor = None
def __iter__(self):
while True:
row = self.fetchone()
if row is None:
raise StopIteration
else:
yield row
@util.memoized_property
def inserted_primary_key(self):
"""Return the primary key for the row just inserted.
The return value is a list of scalar values
corresponding to the list of primary key columns
in the target table.
This only applies to single row :func:`.insert`
constructs which did not explicitly specify
:meth:`.Insert.returning`.
Note that primary key columns which specify a
server_default clause,
or otherwise do not qualify as "autoincrement"
columns (see the notes at :class:`.Column`), and were
generated using the database-side default, will
appear in this list as ``None`` unless the backend
supports "returning" and the insert statement executed
with the "implicit returning" enabled.
Raises :class:`~sqlalchemy.exc.InvalidRequestError` if the executed
statement is not a compiled expression construct
or is not an insert() construct.
"""
if not self.context.compiled:
raise exc.InvalidRequestError(
"Statement is not a compiled "
"expression construct.")
elif not self.context.isinsert:
raise exc.InvalidRequestError(
"Statement is not an insert() "
"expression construct.")
elif self.context._is_explicit_returning:
raise exc.InvalidRequestError(
"Can't call inserted_primary_key "
"when returning() "
"is used.")
return self.context.inserted_primary_key
def last_updated_params(self):
"""Return the collection of updated parameters from this
execution.
Raises :class:`~sqlalchemy.exc.InvalidRequestError` if the executed
statement is not a compiled expression construct
or is not an update() construct.
"""
if not self.context.compiled:
raise exc.InvalidRequestError(
"Statement is not a compiled "
"expression construct.")
elif not self.context.isupdate:
raise exc.InvalidRequestError(
"Statement is not an update() "
"expression construct.")
elif self.context.executemany:
return self.context.compiled_parameters
else:
return self.context.compiled_parameters[0]
def last_inserted_params(self):
"""Return the collection of inserted parameters from this
execution.
Raises :class:`~sqlalchemy.exc.InvalidRequestError` if the executed
statement is not a compiled expression construct
or is not an insert() construct.
"""
if not self.context.compiled:
raise exc.InvalidRequestError(
"Statement is not a compiled "
"expression construct.")
elif not self.context.isinsert:
raise exc.InvalidRequestError(
"Statement is not an insert() "
"expression construct.")
elif self.context.executemany:
return self.context.compiled_parameters
else:
return self.context.compiled_parameters[0]
@property
def returned_defaults(self):
"""Return the values of default columns that were fetched using
the :meth:`.ValuesBase.return_defaults` feature.
The value is an instance of :class:`.RowProxy`, or ``None``
if :meth:`.ValuesBase.return_defaults` was not used or if the
backend does not support RETURNING.
.. versionadded:: 0.9.0
.. seealso::
:meth:`.ValuesBase.return_defaults`
"""
return self.context.returned_defaults
def lastrow_has_defaults(self):
"""Return ``lastrow_has_defaults()`` from the underlying
:class:`.ExecutionContext`.
See :class:`.ExecutionContext` for details.
"""
return self.context.lastrow_has_defaults()
def postfetch_cols(self):
"""Return ``postfetch_cols()`` from the underlying
:class:`.ExecutionContext`.
See :class:`.ExecutionContext` for details.
Raises :class:`~sqlalchemy.exc.InvalidRequestError` if the executed
statement is not a compiled expression construct
or is not an insert() or update() construct.
"""
if not self.context.compiled:
raise exc.InvalidRequestError(
"Statement is not a compiled "
"expression construct.")
elif not self.context.isinsert and not self.context.isupdate:
raise exc.InvalidRequestError(
"Statement is not an insert() or update() "
"expression construct.")
return self.context.postfetch_cols
def prefetch_cols(self):
"""Return ``prefetch_cols()`` from the underlying
:class:`.ExecutionContext`.
See :class:`.ExecutionContext` for details.
Raises :class:`~sqlalchemy.exc.InvalidRequestError` if the executed
statement is not a compiled expression construct
or is not an insert() or update() construct.
"""
if not self.context.compiled:
raise exc.InvalidRequestError(
"Statement is not a compiled "
"expression construct.")
elif not self.context.isinsert and not self.context.isupdate:
raise exc.InvalidRequestError(
"Statement is not an insert() or update() "
"expression construct.")
return self.context.prefetch_cols
def supports_sane_rowcount(self):
"""Return ``supports_sane_rowcount`` from the dialect.
See :attr:`.ResultProxy.rowcount` for background.
"""
return self.dialect.supports_sane_rowcount
def supports_sane_multi_rowcount(self):
"""Return ``supports_sane_multi_rowcount`` from the dialect.
See :attr:`.ResultProxy.rowcount` for background.
"""
return self.dialect.supports_sane_multi_rowcount
def _fetchone_impl(self):
try:
return self.cursor.fetchone()
except AttributeError:
self._non_result()
def _fetchmany_impl(self, size=None):
try:
if size is None:
return self.cursor.fetchmany()
else:
return self.cursor.fetchmany(size)
except AttributeError:
self._non_result()
def _fetchall_impl(self):
try:
return self.cursor.fetchall()
except AttributeError:
self._non_result()
def _non_result(self):
if self._metadata is None:
raise exc.ResourceClosedError(
"This result object does not return rows. "
"It has been closed automatically.",
)
else:
raise exc.ResourceClosedError("This result object is closed.")
def process_rows(self, rows):
process_row = self._process_row
metadata = self._metadata
keymap = metadata._keymap
processors = metadata._processors
if self._echo:
log = self.context.engine.logger.debug
l = []
for row in rows:
log("Row %r", row)
l.append(process_row(metadata, row, processors, keymap))
return l
else:
return [process_row(metadata, row, processors, keymap)
for row in rows]
def fetchall(self):
"""Fetch all rows, just like DB-API ``cursor.fetchall()``."""
try:
l = self.process_rows(self._fetchall_impl())
self.close()
return l
except Exception as e:
self.connection._handle_dbapi_exception(
e, None, None,
self.cursor, self.context)
def fetchmany(self, size=None):
"""Fetch many rows, just like DB-API
``cursor.fetchmany(size=cursor.arraysize)``.
If rows are present, the cursor remains open after this is called.
Else the cursor is automatically closed and an empty list is returned.
"""
try:
l = self.process_rows(self._fetchmany_impl(size))
if len(l) == 0:
self.close()
return l
except Exception as e:
self.connection._handle_dbapi_exception(
e, None, None,
self.cursor, self.context)
def fetchone(self):
"""Fetch one row, just like DB-API ``cursor.fetchone()``.
If a row is present, the cursor remains open after this is called.
Else the cursor is automatically closed and None is returned.
"""
try:
row = self._fetchone_impl()
if row is not None:
return self.process_rows([row])[0]
else:
self.close()
return None
except Exception as e:
self.connection._handle_dbapi_exception(
e, None, None,
self.cursor, self.context)
def first(self):
"""Fetch the first row and then close the result set unconditionally.
Returns None if no row is present.
"""
if self._metadata is None:
self._non_result()
try:
row = self._fetchone_impl()
except Exception as e:
self.connection._handle_dbapi_exception(
e, None, None,
self.cursor, self.context)
try:
if row is not None:
return self.process_rows([row])[0]
else:
return None
finally:
self.close()
def scalar(self):
"""Fetch the first column of the first row, and close the result set.
Returns None if no row is present.
"""
row = self.first()
if row is not None:
return row[0]
else:
return None
class BufferedRowResultProxy(ResultProxy):
"""A ResultProxy with row buffering behavior.
``ResultProxy`` that buffers the contents of a selection of rows
before ``fetchone()`` is called. This is to allow the results of
``cursor.description`` to be available immediately, when
interfacing with a DB-API that requires rows to be consumed before
this information is available (currently psycopg2, when used with
server-side cursors).
The pre-fetching behavior fetches only one row initially, and then
grows its buffer size by a fixed amount with each successive need
for additional rows up to a size of 100.
"""
def _init_metadata(self):
self.__buffer_rows()
super(BufferedRowResultProxy, self)._init_metadata()
# this is a "growth chart" for the buffering of rows.
# each successive __buffer_rows call will use the next
# value in the list for the buffer size until the max
# is reached
size_growth = {
1: 5,
5: 10,
10: 20,
20: 50,
50: 100,
100: 250,
250: 500,
500: 1000
}
def __buffer_rows(self):
size = getattr(self, '_bufsize', 1)
self.__rowbuffer = collections.deque(self.cursor.fetchmany(size))
self._bufsize = self.size_growth.get(size, size)
def _fetchone_impl(self):
if self.closed:
return None
if not self.__rowbuffer:
self.__buffer_rows()
if not self.__rowbuffer:
return None
return self.__rowbuffer.popleft()
def _fetchmany_impl(self, size=None):
if size is None:
return self._fetchall_impl()
result = []
for x in range(0, size):
row = self._fetchone_impl()
if row is None:
break
result.append(row)
return result
def _fetchall_impl(self):
self.__rowbuffer.extend(self.cursor.fetchall())
ret = self.__rowbuffer
self.__rowbuffer = collections.deque()
return ret
class FullyBufferedResultProxy(ResultProxy):
"""A result proxy that buffers rows fully upon creation.
Used for operations where a result is to be delivered
after the database conversation can not be continued,
such as MSSQL INSERT...OUTPUT after an autocommit.
"""
def _init_metadata(self):
super(FullyBufferedResultProxy, self)._init_metadata()
self.__rowbuffer = self._buffer_rows()
def _buffer_rows(self):
return collections.deque(self.cursor.fetchall())
def _fetchone_impl(self):
if self.__rowbuffer:
return self.__rowbuffer.popleft()
else:
return None
def _fetchmany_impl(self, size=None):
if size is None:
return self._fetchall_impl()
result = []
for x in range(0, size):
row = self._fetchone_impl()
if row is None:
break
result.append(row)
return result
def _fetchall_impl(self):
ret = self.__rowbuffer
self.__rowbuffer = collections.deque()
return ret
class BufferedColumnRow(RowProxy):
def __init__(self, parent, row, processors, keymap):
# preprocess row
row = list(row)
# this is a tad faster than using enumerate
index = 0
for processor in parent._orig_processors:
if processor is not None:
row[index] = processor(row[index])
index += 1
row = tuple(row)
super(BufferedColumnRow, self).__init__(parent, row,
processors, keymap)
class BufferedColumnResultProxy(ResultProxy):
"""A ResultProxy with column buffering behavior.
``ResultProxy`` that loads all columns into memory each time
fetchone() is called. If fetchmany() or fetchall() are called,
the full grid of results is fetched. This is to operate with
databases where result rows contain "live" results that fall out
of scope unless explicitly fetched. Currently this includes
cx_Oracle LOB objects.
"""
_process_row = BufferedColumnRow
def _init_metadata(self):
super(BufferedColumnResultProxy, self)._init_metadata()
metadata = self._metadata
# orig_processors will be used to preprocess each row when they are
# constructed.
metadata._orig_processors = metadata._processors
# replace the all type processors by None processors.
metadata._processors = [None for _ in range(len(metadata.keys))]
keymap = {}
for k, (func, obj, index) in metadata._keymap.items():
keymap[k] = (None, obj, index)
self._metadata._keymap = keymap
def fetchall(self):
# can't call cursor.fetchall(), since rows must be
# fully processed before requesting more from the DBAPI.
l = []
while True:
row = self.fetchone()
if row is None:
break
l.append(row)
return l
def fetchmany(self, size=None):
# can't call cursor.fetchmany(), since rows must be
# fully processed before requesting more from the DBAPI.
if size is None:
return self.fetchall()
l = []
for i in range(size):
row = self.fetchone()
if row is None:
break
l.append(row)
return l
|