/usr/lib/python2.7/dist-packages/sqlobject/main.py is in python-sqlobject 1.6.0-1.
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 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 | """
SQLObject
---------
:author: Ian Bicking <ianb@colorstudy.com>
SQLObject is a object-relational mapper. See SQLObject.html or
SQLObject.txt for more.
With the help by Oleg Broytman and many other contributors.
See Authors.txt.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.
"""
import threading
import weakref
import sqlbuilder
import dbconnection
import col
import styles
import types
import warnings
import joins
import index
import classregistry
import declarative
import events
from sresults import SelectResults
from util.threadinglocal import local
import sys
if sys.version_info[:3] < (2, 5, 0):
raise ImportError, "SQLObject requires Python 2.5.0 or later"
"""
This thread-local storage is needed for RowCreatedSignals. It gathers
code-blocks to execute _after_ the whole hierachy of inherited SQLObjects
is created. See SQLObject._create
"""
NoDefault = sqlbuilder.NoDefault
class SQLObjectNotFound(LookupError): pass
class SQLObjectIntegrityError(Exception): pass
def makeProperties(obj):
"""
This function takes a dictionary of methods and finds
methods named like:
* _get_attr
* _set_attr
* _del_attr
* _doc_attr
Except for _doc_attr, these should be methods. It
then creates properties from these methods, like
property(_get_attr, _set_attr, _del_attr, _doc_attr).
Missing methods are okay.
"""
if isinstance(obj, dict):
def setFunc(var, value):
obj[var] = value
d = obj
else:
def setFunc(var, value):
setattr(obj, var, value)
d = obj.__dict__
props = {}
for var, value in d.items():
if var.startswith('_set_'):
props.setdefault(var[5:], {})['set'] = value
elif var.startswith('_get_'):
props.setdefault(var[5:], {})['get'] = value
elif var.startswith('_del_'):
props.setdefault(var[5:], {})['del'] = value
elif var.startswith('_doc_'):
props.setdefault(var[5:], {})['doc'] = value
for var, setters in props.items():
if len(setters) == 1 and 'doc' in setters:
continue
if var in d:
if isinstance(d[var], (types.MethodType, types.FunctionType)):
warnings.warn(
"I tried to set the property %r, but it was "
"already set, as a method (%r). Methods have "
"significantly different semantics than properties, "
"and this may be a sign of a bug in your code."
% (var, d[var]))
continue
setFunc(var,
property(setters.get('get'), setters.get('set'),
setters.get('del'), setters.get('doc')))
def unmakeProperties(obj):
if isinstance(obj, dict):
def delFunc(obj, var):
del obj[var]
d = obj
else:
delFunc = delattr
d = obj.__dict__
for var, value in d.items():
if isinstance(value, property):
for prop in [value.fget, value.fset, value.fdel]:
if prop and not prop.__name__ in d:
delFunc(obj, var)
break
def findDependencies(name, registry=None):
depends = []
for klass in classregistry.registry(registry).allClasses():
if findDependantColumns(name, klass):
depends.append(klass)
else:
for join in klass.sqlmeta.joins:
if isinstance(join, joins.SORelatedJoin) and join.otherClassName == name:
depends.append(klass)
break
return depends
def findDependantColumns(name, klass):
depends = []
for col in klass.sqlmeta.columnList:
if col.foreignKey == name and col.cascade is not None:
depends.append(col)
return depends
def _collectAttributes(cls, new_attrs, look_for_class):
"""Finds all attributes in `new_attrs` that are instances of
`look_for_class`. The ``.name`` attribute is set for any matching objects.
Returns them as a list.
"""
result = []
for attr, value in new_attrs.items():
if isinstance(value, look_for_class):
value.name = attr
delattr(cls, attr)
result.append(value)
return result
class CreateNewSQLObject:
"""
Dummy singleton to use in place of an ID, to signal we want
a new object.
"""
pass
class sqlmeta(object):
"""
This object is the object we use to keep track of all sorts of
information. Subclasses are made for each SQLObject subclass
(dynamically if necessary), and instances are created to go
alongside every SQLObject instance.
"""
table = None
idName = None
idSequence = None
# This function is used to coerce IDs into the proper format,
# so you should replace it with str, or another function, if you
# aren't using integer IDs
idType = int
style = None
lazyUpdate = False
defaultOrder = None
cacheValues = True
registry = None
fromDatabase = False
# Default is false, but we set it to true for the *instance*
# when necessary: (bad clever? maybe)
expired = False
# This is a mapping from column names to SOCol (or subclass)
# instances:
columns = {}
columnList = []
# This is a mapping from column names to Col (or subclass)
# instances; these objects don't have the logic that the SOCol
# objects do, and are not attached to this class closely.
columnDefinitions = {}
# These are lists of the join and index objects:
indexes = []
indexDefinitions = []
joins = []
joinDefinitions = []
# These attributes shouldn't be shared with superclasses:
_unshared_attributes = ['table', 'columns', 'childName']
# These are internal bookkeeping attributes; the class-level
# definition is a default for the instances, instances will
# reset these values.
# When an object is being created, it has an instance
# variable _creating, which is true. This way all the
# setters can be captured until the object is complete,
# and then the row is inserted into the database. Once
# that happens, _creating is deleted from the instance,
# and only the class variable (which is always false) is
# left.
_creating = False
_obsolete = False
# Sometimes an intance is attached to a connection, not
# globally available. In that case, self.sqlmeta._perConnection
# will be true. It's false by default:
_perConnection = False
# Inheritance definitions:
parentClass = None # A reference to the parent class
childClasses = {} # References to child classes, keyed by childName
childName = None # Class name for inheritance child object creation
# Does the row require syncing?
dirty = False
# Default encoding for UnicodeCol's
dbEncoding = None
__metaclass__ = declarative.DeclarativeMeta
def __classinit__(cls, new_attrs):
for attr in cls._unshared_attributes:
if attr not in new_attrs:
setattr(cls, attr, None)
declarative.setup_attributes(cls, new_attrs)
def __init__(self, instance):
self.instance = weakref.proxy(instance)
@classmethod
def send(cls, signal, *args, **kw):
events.send(signal, cls.soClass, *args, **kw)
@classmethod
def setClass(cls, soClass):
cls.soClass = soClass
if not cls.style:
cls.style = styles.defaultStyle
try:
if cls.soClass._connection and cls.soClass._connection.style:
cls.style = cls.soClass._connection.style
except AttributeError:
pass
if cls.table is None:
cls.table = cls.style.pythonClassToDBTable(cls.soClass.__name__)
if cls.idName is None:
cls.idName = cls.style.idForTable(cls.table)
# plainSetters are columns that haven't been overridden by the
# user, so we can contact the database directly to set them.
# Note that these can't set these in the SQLObject class
# itself, because they specific to this subclass of SQLObject,
# and cannot be shared among classes.
cls._plainSetters = {}
cls._plainGetters = {}
cls._plainForeignSetters = {}
cls._plainForeignGetters = {}
cls._plainJoinGetters = {}
cls._plainJoinAdders = {}
cls._plainJoinRemovers = {}
# This is a dictionary of columnName: columnObject
# None of these objects can be shared with superclasses
cls.columns = {}
cls.columnList = []
# These, however, can be shared:
cls.columnDefinitions = cls.columnDefinitions.copy()
cls.indexes = []
cls.indexDefinitions = cls.indexDefinitions[:]
cls.joins = []
cls.joinDefinitions = cls.joinDefinitions[:]
############################################################
## Adding special values, like columns and indexes
############################################################
########################################
## Column handling
########################################
@classmethod
def addColumn(cls, columnDef, changeSchema=False, connection=None):
post_funcs = []
cls.send(events.AddColumnSignal, cls.soClass, connection,
columnDef.name, columnDef, changeSchema, post_funcs)
sqlmeta = cls
soClass = cls.soClass
del cls
column = columnDef.withClass(soClass)
name = column.name
assert name != 'id', (
"The 'id' column is implicit, and should not be defined as "
"a column")
assert name not in sqlmeta.columns, (
"The class %s.%s already has a column %r (%r), you cannot "
"add the column %r"
% (soClass.__module__, soClass.__name__, name,
sqlmeta.columnDefinitions[name], columnDef))
# Collect columns from the parent classes to test
# if the column is not in a parent class
parent_columns = []
for base in soClass.__bases__:
if hasattr(base, "sqlmeta"):
parent_columns.extend(base.sqlmeta.columns.keys())
if hasattr(soClass, name):
assert (name in parent_columns) or (name == "childName"), (
"The class %s.%s already has a variable or method %r, you cannot "
"add the column %r"
% (soClass.__module__, soClass.__name__, name, name))
sqlmeta.columnDefinitions[name] = columnDef
sqlmeta.columns[name] = column
# A stable-ordered version of the list...
sqlmeta.columnList.append(column)
###################################################
# Create the getter function(s). We'll start by
# creating functions like _SO_get_columnName,
# then if there's no function named _get_columnName
# we'll alias that to _SO_get_columnName. This
# allows a sort of super call, even though there's
# no superclass that defines the database access.
if sqlmeta.cacheValues:
# We create a method here, which is just a function
# that takes "self" as the first argument.
getter = eval('lambda self: self._SO_loadValue(%s)' % repr(instanceName(name)))
else:
# If we aren't caching values, we just call the
# function _SO_getValue, which fetches from the
# database.
getter = eval('lambda self: self._SO_getValue(%s)' % repr(name))
setattr(soClass, rawGetterName(name), getter)
# Here if the _get_columnName method isn't in the
# definition, we add it with the default
# _SO_get_columnName definition.
if not hasattr(soClass, getterName(name)) or (name == 'childName'):
setattr(soClass, getterName(name), getter)
sqlmeta._plainGetters[name] = 1
#################################################
# Create the setter function(s)
# Much like creating the getters, we will create
# _SO_set_columnName methods, and then alias them
# to _set_columnName if the user hasn't defined
# those methods themself.
# @@: This is lame; immutable right now makes it unsettable,
# making the table read-only
if not column.immutable:
# We start by just using the _SO_setValue method
setter = eval('lambda self, val: self._SO_setValue(%s, val, self.%s, self.%s)' % (repr(name), '_SO_from_python_%s' % name, '_SO_to_python_%s' % name))
setattr(soClass, '_SO_from_python_%s' % name, column.from_python)
setattr(soClass, '_SO_to_python_%s' % name, column.to_python)
setattr(soClass, rawSetterName(name), setter)
# Then do the aliasing
if not hasattr(soClass, setterName(name)) or (name == 'childName'):
setattr(soClass, setterName(name), setter)
# We keep track of setters that haven't been
# overridden, because we can combine these
# set columns into one SQL UPDATE query.
sqlmeta._plainSetters[name] = 1
##################################################
# Here we check if the column is a foreign key, in
# which case we need to make another method that
# fetches the key and constructs the sister
# SQLObject instance.
if column.foreignKey:
# We go through the standard _SO_get_columnName deal
# we're giving the object, not the ID of the
# object this time:
origName = column.origName
if sqlmeta.cacheValues:
# self._SO_class_className is a reference
# to the class in question.
getter = eval('lambda self: self._SO_foreignKey(self._SO_loadValue(%r), self._SO_class_%s, %s)' % (instanceName(name), column.foreignKey, column.refColumn and repr(column.refColumn)))
else:
# Same non-caching version as above.
getter = eval('lambda self: self._SO_foreignKey(self._SO_getValue(%s), self._SO_class_%s, %s)' % (repr(name), column.foreignKey, column.refColumn and repr(column.refColumn)))
setattr(soClass, rawGetterName(origName), getter)
# And we set the _get_columnName version
if not hasattr(soClass, getterName(origName)):
setattr(soClass, getterName(origName), getter)
sqlmeta._plainForeignGetters[origName] = 1
if not column.immutable:
# The setter just gets the ID of the object,
# and then sets the real column.
setter = eval('lambda self, val: setattr(self, %s, self._SO_getID(val, %s))' % (repr(name), column.refColumn and repr(column.refColumn)))
setattr(soClass, rawSetterName(origName), setter)
if not hasattr(soClass, setterName(origName)):
setattr(soClass, setterName(origName), setter)
sqlmeta._plainForeignSetters[origName] = 1
classregistry.registry(sqlmeta.registry).addClassCallback(
column.foreignKey,
lambda foreign, me, attr: setattr(me, attr, foreign),
soClass, '_SO_class_%s' % column.foreignKey)
if column.alternateMethodName:
func = eval('lambda cls, val, connection=None: cls._SO_fetchAlternateID(%s, %s, val, connection=connection)' % (repr(column.name), repr(column.dbName)))
setattr(soClass, column.alternateMethodName, classmethod(func))
if changeSchema:
conn = connection or soClass._connection
conn.addColumn(sqlmeta.table, column)
if soClass._SO_finishedClassCreation:
makeProperties(soClass)
for func in post_funcs:
func(soClass, column)
@classmethod
def addColumnsFromDatabase(sqlmeta, connection=None):
soClass = sqlmeta.soClass
conn = connection or soClass._connection
for columnDef in conn.columnsFromSchema(sqlmeta.table, soClass):
if columnDef.name not in sqlmeta.columnDefinitions:
if isinstance(columnDef.name, unicode):
columnDef.name = columnDef.name.encode('ascii')
sqlmeta.addColumn(columnDef)
@classmethod
def delColumn(cls, column, changeSchema=False, connection=None):
sqlmeta = cls
soClass = sqlmeta.soClass
if isinstance(column, str):
if column in sqlmeta.columns:
column = sqlmeta.columns[column]
elif column+'ID' in sqlmeta.columns:
column = sqlmeta.columns[column+'ID']
else:
raise ValueError('Unknown column ' + column)
if isinstance(column, col.Col):
for c in sqlmeta.columns.values():
if column is c.columnDef:
column = c
break
else:
raise IndexError(
"Column with definition %r not found" % column)
post_funcs = []
cls.send(events.DeleteColumnSignal, cls.soClass, connection,
column.name, column, post_funcs)
name = column.name
del sqlmeta.columns[name]
del sqlmeta.columnDefinitions[name]
sqlmeta.columnList.remove(column)
delattr(soClass, rawGetterName(name))
if name in sqlmeta._plainGetters:
delattr(soClass, getterName(name))
delattr(soClass, rawSetterName(name))
if name in sqlmeta._plainSetters:
delattr(soClass, setterName(name))
if column.foreignKey:
delattr(soClass, rawGetterName(soClass.sqlmeta.style.instanceIDAttrToAttr(name)))
if name in sqlmeta._plainForeignGetters:
delattr(soClass, getterName(name))
delattr(soClass, rawSetterName(soClass.sqlmeta.style.instanceIDAttrToAttr(name)))
if name in sqlmeta._plainForeignSetters:
delattr(soClass, setterName(name))
if column.alternateMethodName:
delattr(soClass, column.alternateMethodName)
if changeSchema:
conn = connection or soClass._connection
conn.delColumn(sqlmeta, column)
if soClass._SO_finishedClassCreation:
unmakeProperties(soClass)
makeProperties(soClass)
for func in post_funcs:
func(soClass, column)
########################################
## Join handling
########################################
@classmethod
def addJoin(cls, joinDef):
sqlmeta = cls
soClass = cls.soClass
# The name of the method we'll create. If it's
# automatically generated, it's generated by the
# join class.
join = joinDef.withClass(soClass)
meth = join.joinMethodName
sqlmeta.joins.append(join)
index = len(sqlmeta.joins)-1
if joinDef not in sqlmeta.joinDefinitions:
sqlmeta.joinDefinitions.append(joinDef)
# The function fetches the join by index, and
# then lets the join object do the rest of the
# work:
func = eval('lambda self: self.sqlmeta.joins[%i].performJoin(self)' % index)
# And we do the standard _SO_get_... _get_... deal
setattr(soClass, rawGetterName(meth), func)
if not hasattr(soClass, getterName(meth)):
setattr(soClass, getterName(meth), func)
sqlmeta._plainJoinGetters[meth] = 1
# Some joins allow you to remove objects from the
# join.
if hasattr(join, 'remove'):
# Again, we let it do the remove, and we do the
# standard naming trick.
func = eval('lambda self, obj: self.sqlmeta.joins[%i].remove(self, obj)' % index)
setattr(soClass, '_SO_remove' + join.addRemoveName, func)
if not hasattr(soClass, 'remove' + join.addRemoveName):
setattr(soClass, 'remove' + join.addRemoveName, func)
sqlmeta._plainJoinRemovers[meth] = 1
# Some joins allow you to add objects.
if hasattr(join, 'add'):
# And again...
func = eval('lambda self, obj: self.sqlmeta.joins[%i].add(self, obj)' % index)
setattr(soClass, '_SO_add' + join.addRemoveName, func)
if not hasattr(soClass, 'add' + join.addRemoveName):
setattr(soClass, 'add' + join.addRemoveName, func)
sqlmeta._plainJoinAdders[meth] = 1
if soClass._SO_finishedClassCreation:
makeProperties(soClass)
@classmethod
def delJoin(sqlmeta, joinDef):
soClass = sqlmeta.soClass
for join in sqlmeta.joins:
# previously deleted joins will be None, so it must
# be skipped or it'll error out on the next line.
if join is None:
continue
if joinDef is join.joinDef:
break
else:
raise IndexError(
"Join %r not found in class %r (from %r)"
% (joinDef, soClass, sqlmeta.joins))
meth = join.joinMethodName
sqlmeta.joinDefinitions.remove(joinDef)
for i in range(len(sqlmeta.joins)):
if sqlmeta.joins[i] is join:
# Have to leave None, because we refer to joins
# by index.
sqlmeta.joins[i] = None
delattr(soClass, rawGetterName(meth))
if meth in sqlmeta._plainJoinGetters:
delattr(soClass, getterName(meth))
if hasattr(join, 'remove'):
delattr(soClass, '_SO_remove' + join.addRemovePrefix)
if meth in sqlmeta._plainJoinRemovers:
delattr(soClass, 'remove' + join.addRemovePrefix)
if hasattr(join, 'add'):
delattr(soClass, '_SO_add' + join.addRemovePrefix)
if meth in sqlmeta._plainJoinAdders:
delattr(soClass, 'add' + join.addRemovePrefix)
if soClass._SO_finishedClassCreation:
unmakeProperties(soClass)
makeProperties(soClass)
########################################
## Indexes
########################################
@classmethod
def addIndex(cls, indexDef):
cls.indexDefinitions.append(indexDef)
index = indexDef.withClass(cls.soClass)
cls.indexes.append(index)
setattr(cls.soClass, index.name, index)
########################################
## Utility methods
########################################
@classmethod
def getColumns(sqlmeta):
return sqlmeta.columns.copy()
def asDict(self):
"""
Return the object as a dictionary of columns to values.
"""
result = {}
for key in self.getColumns():
result[key] = getattr(self.instance, key)
result['id'] = self.instance.id
return result
@classmethod
def expireAll(sqlmeta, connection=None):
"""
Expire all instances of this class.
"""
soClass = sqlmeta.soClass
connection = connection or soClass._connection
cache_set = connection.cache
cache_set.weakrefAll(soClass)
for item in cache_set.getAll(soClass):
item.expire()
sqlhub = dbconnection.ConnectionHub()
# Turning it on gives earlier warning about things
# that will be deprecated (having this off we won't flood people
# with warnings right away).
warnings_level = 1
exception_level = None
# Current levels:
# 1) Actively deprecated
# 2) Deprecated after 1
# 3) Deprecated after 2
def deprecated(message, level=1, stacklevel=2):
if exception_level is not None and exception_level <= level:
raise NotImplementedError(message)
if warnings_level is not None and warnings_level <= level:
warnings.warn(message, DeprecationWarning, stacklevel=stacklevel)
#if sys.version_info[:3] < (2, 5, 0):
# deprecated("Support for Python 2.4 has been declared obsolete and will be removed in the next release of SQLObject")
def setDeprecationLevel(warning=1, exception=None):
"""
Set the deprecation level for SQLObject. Low levels are more
actively being deprecated. Any warning at a level at or below
``warning`` will give a warning. Any warning at a level at or
below ``exception`` will give an exception. You can use a higher
``exception`` level for tests to help upgrade your code. ``None``
for either value means never warn or raise exceptions.
The levels currently mean:
1) Deprecated in current version. Will be removed in next version.
2) Planned to deprecate in next version, remove later.
3) Planned to deprecate sometime, remove sometime much later.
As the SQLObject versions progress, the deprecation level of
specific features will go down, indicating the advancing nature of
the feature's doom. We'll try to keep features at 1 for a major
revision.
As time continues there may be a level 0, which will give a useful
error message (better than ``AttributeError``) but where the
feature has been fully removed.
"""
global warnings_level, exception_level
warnings_level = warning
exception_level = exception
class _sqlmeta_attr(object):
def __init__(self, name, deprecation_level):
self.name = name
self.deprecation_level = deprecation_level
def __get__(self, obj, type=None):
if self.deprecation_level is not None:
deprecated(
'Use of this attribute should be replaced with '
'.sqlmeta.%s' % self.name, level=self.deprecation_level)
return getattr((type or obj).sqlmeta, self.name)
_postponed_local = local()
# SQLObject is the superclass for all SQLObject classes, of
# course. All the deeper magic is done in MetaSQLObject, and
# only lesser magic is done here. All the actual work is done
# here, though -- just automatic method generation (like
# methods and properties for each column) is done in
# MetaSQLObject.
class SQLObject(object):
__metaclass__ = declarative.DeclarativeMeta
_connection = sqlhub
sqlmeta = sqlmeta
#DSM: The _inheritable attribute controls wheter the class can by
#DSM: inherited 'logically' with a foreignKey and a back reference.
_inheritable = False # Is this class inheritable?
_parent = None # A reference to the parent instance
childName = None # Children name (to be able to get a subclass)
# The law of Demeter: the class should not call another classes by name
SelectResultsClass = SelectResults
def __classinit__(cls, new_attrs):
# This is true if we're initializing the SQLObject class,
# instead of a subclass:
is_base = cls.__bases__ == (object,)
cls._SO_setupSqlmeta(new_attrs, is_base)
implicitColumns = _collectAttributes(cls, new_attrs, col.Col)
implicitJoins = _collectAttributes(cls, new_attrs, joins.Join)
implicitIndexes = _collectAttributes(cls, new_attrs, index.DatabaseIndex)
if not is_base:
cls._SO_cleanDeprecatedAttrs(new_attrs)
if '_connection' in new_attrs:
connection = new_attrs['_connection']
del cls._connection
assert 'connection' not in new_attrs
elif 'connection' in new_attrs:
connection = new_attrs['connection']
del cls.connection
else:
connection = None
cls._SO_finishedClassCreation = False
######################################################
# Set some attributes to their defaults, if necessary.
# First we get the connection:
if not connection and not getattr(cls, '_connection', None):
mod = sys.modules[cls.__module__]
# See if there's a __connection__ global in
# the module, use it if there is.
if hasattr(mod, '__connection__'):
connection = mod.__connection__
# Do not check hasattr(cls, '_connection') here - it is possible
# SQLObject parent class has a connection attribute that came
# from sqlhub, e.g.; check __dict__ only.
if connection and ('_connection' not in cls.__dict__):
cls.setConnection(connection)
sqlmeta = cls.sqlmeta
# We have to check if there are columns in the inherited
# _columns where the attribute has been set to None in this
# class. If so, then we need to remove that column from
# _columns.
for key in sqlmeta.columnDefinitions.keys():
if (key in new_attrs
and new_attrs[key] is None):
del sqlmeta.columnDefinitions[key]
for column in sqlmeta.columnDefinitions.values():
sqlmeta.addColumn(column)
for column in implicitColumns:
sqlmeta.addColumn(column)
# Now the class is in an essentially OK-state, so we can
# set up any magic attributes:
declarative.setup_attributes(cls, new_attrs)
if sqlmeta.fromDatabase:
sqlmeta.addColumnsFromDatabase()
for j in implicitJoins:
sqlmeta.addJoin(j)
for i in implicitIndexes:
sqlmeta.addIndex(i)
order_getter = lambda o: o.creationOrder
sqlmeta.columnList.sort(key=order_getter)
sqlmeta.indexes.sort(key=order_getter)
sqlmeta.indexDefinitions.sort(key=order_getter)
# Joins cannot be sorted because addJoin created accessors
# that remember indexes.
#sqlmeta.joins.sort(key=order_getter)
sqlmeta.joinDefinitions.sort(key=order_getter)
# We don't setup the properties until we're finished with the
# batch adding of all the columns...
cls._notifyFinishClassCreation()
cls._SO_finishedClassCreation = True
makeProperties(cls)
# We use the magic "q" attribute for accessing lazy
# SQL where-clause generation. See the sql module for
# more.
if not is_base:
cls.q = sqlbuilder.SQLObjectTable(cls)
cls.j = sqlbuilder.SQLObjectTableWithJoins(cls)
classregistry.registry(sqlmeta.registry).addClass(cls)
@classmethod
def _SO_setupSqlmeta(cls, new_attrs, is_base):
"""
This fixes up the sqlmeta attribute. It handles both the case
where no sqlmeta was given (in which we need to create another
subclass), or the sqlmeta given doesn't have the proper
inheritance. Lastly it calls sqlmeta.setClass, which handles
much of the setup.
"""
if ('sqlmeta' not in new_attrs
and not is_base):
# We have to create our own subclass, usually.
# type(className, bases_tuple, attr_dict) creates a new subclass.
cls.sqlmeta = type('sqlmeta', (cls.sqlmeta,), {})
if not issubclass(cls.sqlmeta, sqlmeta):
# We allow no superclass and an object superclass, instead
# of inheriting from sqlmeta; but in that case we replace
# the class and just move over its attributes:
assert cls.sqlmeta.__bases__ in ((), (object,)), (
"If you do not inherit your sqlmeta class from "
"sqlobject.sqlmeta, it must not inherit from any other "
"class (your sqlmeta inherits from: %s)"
% cls.sqlmeta.__bases__)
for base in cls.__bases__:
superclass = getattr(base, 'sqlmeta', None)
if superclass:
break
else:
assert 0, (
"No sqlmeta class could be found in any superclass "
"(while fixing up sqlmeta %r inheritance)"
% cls.sqlmeta)
values = dict(cls.sqlmeta.__dict__)
for key in values.keys():
if key.startswith('__') and key.endswith('__'):
# Magic values shouldn't be passed through:
del values[key]
cls.sqlmeta = type('sqlmeta', (superclass,), values)
if not is_base: # Do not pollute the base sqlmeta class
cls.sqlmeta.setClass(cls)
@classmethod
def _SO_cleanDeprecatedAttrs(cls, new_attrs):
"""
This removes attributes on SQLObject subclasses that have
been deprecated; they are moved to the sqlmeta class, and
a deprecation warning is given.
"""
for attr in ():
if attr in new_attrs:
deprecated("%r is deprecated and read-only; please do "
"not use it in your classes until it is fully "
"deprecated" % attr, level=1, stacklevel=5)
@classmethod
def get(cls, id, connection=None, selectResults=None):
assert id is not None, 'None is not a possible id for %s' % cls.__name__
id = cls.sqlmeta.idType(id)
if connection is None:
cache = cls._connection.cache
else:
cache = connection.cache
# This whole sequence comes from Cache.CacheFactory's
# behavior, where a None returned means a cache miss.
val = cache.get(id, cls)
if val is None:
try:
val = cls(_SO_fetch_no_create=1)
val._SO_validatorState = sqlbuilder.SQLObjectState(val)
val._init(id, connection, selectResults)
cache.put(id, cls, val)
finally:
cache.finishPut(cls)
elif selectResults and not val.sqlmeta.dirty:
val._SO_writeLock.acquire()
try:
val._SO_selectInit(selectResults)
val.sqlmeta.expired = False
finally:
val._SO_writeLock.release()
return val
@classmethod
def _notifyFinishClassCreation(cls):
pass
def _init(self, id, connection=None, selectResults=None):
assert id is not None
# This function gets called only when the object is
# created, unlike __init__ which would be called
# anytime the object was returned from cache.
self.id = id
self._SO_writeLock = threading.Lock()
# If no connection was given, we'll inherit the class
# instance variable which should have a _connection
# attribute.
if (connection is not None) and \
(getattr(self, '_connection', None) is not connection):
self._connection = connection
# Sometimes we need to know if this instance is
# global or tied to a particular connection.
# This flag tells us that:
self.sqlmeta._perConnection = True
if not selectResults:
dbNames = [col.dbName for col in self.sqlmeta.columnList]
selectResults = self._connection._SO_selectOne(self, dbNames)
if not selectResults:
raise SQLObjectNotFound, "The object %s by the ID %s does not exist" % (self.__class__.__name__, self.id)
self._SO_selectInit(selectResults)
self._SO_createValues = {}
self.sqlmeta.dirty = False
def _SO_loadValue(self, attrName):
try:
return getattr(self, attrName)
except AttributeError:
try:
self._SO_writeLock.acquire()
try:
# Maybe, just in the moment since we got the lock,
# some other thread did a _SO_loadValue and we
# have the attribute! Let's try and find out! We
# can keep trying this all day and still beat the
# performance on the database call (okay, we can
# keep trying this for a few msecs at least)...
result = getattr(self, attrName)
except AttributeError:
pass
else:
return result
self.sqlmeta.expired = False
dbNames = [col.dbName for col in self.sqlmeta.columnList]
selectResults = self._connection._SO_selectOne(self, dbNames)
if not selectResults:
raise SQLObjectNotFound, "The object %s by the ID %s has been deleted" % (self.__class__.__name__, self.id)
self._SO_selectInit(selectResults)
result = getattr(self, attrName)
return result
finally:
self._SO_writeLock.release()
def sync(self):
if self.sqlmeta.lazyUpdate and self._SO_createValues:
self.syncUpdate()
self._SO_writeLock.acquire()
try:
dbNames = [col.dbName for col in self.sqlmeta.columnList]
selectResults = self._connection._SO_selectOne(self, dbNames)
if not selectResults:
raise SQLObjectNotFound, "The object %s by the ID %s has been deleted" % (self.__class__.__name__, self.id)
self._SO_selectInit(selectResults)
self.sqlmeta.expired = False
finally:
self._SO_writeLock.release()
def syncUpdate(self):
if not self._SO_createValues:
return
self._SO_writeLock.acquire()
try:
if self.sqlmeta.columns:
values = [(self.sqlmeta.columns[v[0]].dbName, v[1])
for v in self._SO_createValues.items()]
self._connection._SO_update(self, values)
self.sqlmeta.dirty = False
self._SO_createValues = {}
finally:
self._SO_writeLock.release()
post_funcs = []
self.sqlmeta.send(events.RowUpdatedSignal, self, post_funcs)
for func in post_funcs:
func(self)
def expire(self):
if self.sqlmeta.expired:
return
self._SO_writeLock.acquire()
try:
if self.sqlmeta.expired:
return
for column in self.sqlmeta.columnList:
delattr(self, instanceName(column.name))
self.sqlmeta.expired = True
self._connection.cache.expire(self.id, self.__class__)
self._SO_createValues = {}
finally:
self._SO_writeLock.release()
def _SO_setValue(self, name, value, from_python, to_python):
# This is the place where we actually update the
# database.
# If we are _creating, the object doesn't yet exist
# in the database, and we can't insert it until all
# the parts are set. So we just keep them in a
# dictionary until later:
d = {name: value}
if not self.sqlmeta._creating and not getattr(self.sqlmeta, "row_update_sig_suppress", False):
self.sqlmeta.send(events.RowUpdateSignal, self, d)
if len(d) != 1 or name not in d:
# Already called RowUpdateSignal, don't call it again
# inside .set()
self.sqlmeta.row_update_sig_suppress = True
self.set(**d)
del self.sqlmeta.row_update_sig_suppress
value = d[name]
if from_python:
dbValue = from_python(value, self._SO_validatorState)
else:
dbValue = value
if to_python:
value = to_python(dbValue, self._SO_validatorState)
if self.sqlmeta._creating or self.sqlmeta.lazyUpdate:
self.sqlmeta.dirty = True
self._SO_createValues[name] = dbValue
setattr(self, instanceName(name), value)
return
self._connection._SO_update(
self, [(self.sqlmeta.columns[name].dbName,
dbValue)])
if self.sqlmeta.cacheValues:
setattr(self, instanceName(name), value)
post_funcs = []
self.sqlmeta.send(events.RowUpdatedSignal, self, post_funcs)
for func in post_funcs:
func(self)
def set(self, _suppress_set_sig=False, **kw):
if not self.sqlmeta._creating and not getattr(self.sqlmeta, "row_update_sig_suppress", False) and not _suppress_set_sig:
self.sqlmeta.send(events.RowUpdateSignal, self, kw)
# set() is used to update multiple values at once,
# potentially with one SQL statement if possible.
# Filter out items that don't map to column names.
# Those will be set directly on the object using
# setattr(obj, name, value).
is_column = lambda _c: _c in self.sqlmeta._plainSetters
f_is_column = lambda item: is_column(item[0])
f_not_column = lambda item: not is_column(item[0])
items = kw.items()
extra = dict(filter(f_not_column, items))
kw = dict(filter(f_is_column, items))
# _creating is special, see _SO_setValue
if self.sqlmeta._creating or self.sqlmeta.lazyUpdate:
for name, value in kw.items():
from_python = getattr(self, '_SO_from_python_%s' % name, None)
if from_python:
kw[name] = dbValue = from_python(value, self._SO_validatorState)
else:
dbValue = value
to_python = getattr(self, '_SO_to_python_%s' % name, None)
if to_python:
value = to_python(dbValue, self._SO_validatorState)
setattr(self, instanceName(name), value)
self._SO_createValues.update(kw)
for name, value in extra.items():
try:
getattr(self.__class__, name)
except AttributeError:
if name not in self.sqlmeta.columns:
raise TypeError, "%s.set() got an unexpected keyword argument %s" % (self.__class__.__name__, name)
try:
setattr(self, name, value)
except AttributeError, e:
raise AttributeError, '%s (with attribute %r)' % (e, name)
self.sqlmeta.dirty = True
return
self._SO_writeLock.acquire()
try:
# We have to go through and see if the setters are
# "plain", that is, if the user has changed their
# definition in any way (put in something that
# normalizes the value or checks for consistency,
# for instance). If so then we have to use plain
# old setattr() to change the value, since we can't
# read the user's mind. We'll combine everything
# else into a single UPDATE, if necessary.
toUpdate = {}
for name, value in kw.items():
from_python = getattr(self, '_SO_from_python_%s' % name, None)
if from_python:
dbValue = from_python(value, self._SO_validatorState)
else:
dbValue = value
to_python = getattr(self, '_SO_to_python_%s' % name, None)
if to_python:
value = to_python(dbValue, self._SO_validatorState)
if self.sqlmeta.cacheValues:
setattr(self, instanceName(name), value)
toUpdate[name] = dbValue
for name, value in extra.items():
try:
getattr(self.__class__, name)
except AttributeError:
if name not in self.sqlmeta.columns:
raise TypeError, "%s.set() got an unexpected keyword argument %s" % (self.__class__.__name__, name)
try:
setattr(self, name, value)
except AttributeError, e:
raise AttributeError, '%s (with attribute %r)' % (e, name)
if toUpdate:
args = [(self.sqlmeta.columns[name].dbName, value)
for name, value in toUpdate.items()]
self._connection._SO_update(self, args)
finally:
self._SO_writeLock.release()
post_funcs = []
self.sqlmeta.send(events.RowUpdatedSignal, self, post_funcs)
for func in post_funcs:
func(self)
def _SO_selectInit(self, row):
for col, colValue in zip(self.sqlmeta.columnList, row):
if col.to_python:
colValue = col.to_python(colValue, self._SO_validatorState)
setattr(self, instanceName(col.name), colValue)
def _SO_getValue(self, name):
# Retrieves a single value from the database. Simple.
assert not self.sqlmeta._obsolete, (
"%s with id %s has become obsolete" \
% (self.__class__.__name__, self.id))
# @@: do we really need this lock?
#self._SO_writeLock.acquire()
column = self.sqlmeta.columns[name]
results = self._connection._SO_selectOne(self, [column.dbName])
#self._SO_writeLock.release()
assert results != None, "%s with id %s is not in the database" \
% (self.__class__.__name__, self.id)
value = results[0]
if column.to_python:
value = column.to_python(value, self._SO_validatorState)
return value
def _SO_foreignKey(self, value, joinClass, idName=None):
if value is None:
return None
if self.sqlmeta._perConnection:
connection = self._connection
else:
connection = None
if idName is None: # Get by id
return joinClass.get(value, connection=connection)
return joinClass.select(
getattr(joinClass.q, idName)==value, connection=connection).getOne()
def __init__(self, **kw):
# If we are the outmost constructor of a hiearchy of
# InheritableSQLObjects (or simlpy _the_ constructor of a "normal"
# SQLObject), we create a threadlocal list that collects the
# RowCreatedSignals, and executes them if this very constructor is left
try:
_postponed_local.postponed_calls
postponed_created = False
except AttributeError:
_postponed_local.postponed_calls = []
postponed_created = True
try:
# We shadow the sqlmeta class with an instance of sqlmeta
# that points to us (our sqlmeta buddy object; where the
# sqlmeta class is our class's buddy class)
self.sqlmeta = self.__class__.sqlmeta(self)
# The get() classmethod/constructor uses a magic keyword
# argument when it wants an empty object, fetched from the
# database. So we have nothing more to do in that case:
if '_SO_fetch_no_create' in kw:
return
post_funcs = []
self.sqlmeta.send(events.RowCreateSignal, self, kw, post_funcs)
# Pass the connection object along if we were given one.
if 'connection' in kw:
connection = kw.pop('connection')
if getattr(self, '_connection', None) is not connection:
self._connection = connection
self.sqlmeta._perConnection = True
self._SO_writeLock = threading.Lock()
if 'id' in kw:
id = self.sqlmeta.idType(kw['id'])
del kw['id']
else:
id = None
self._create(id, **kw)
for func in post_funcs:
func(self)
finally:
# if we are the creator of the tl-storage, we
# have to exectute and under all circumstances
# remove the tl-storage
if postponed_created:
try:
for func in _postponed_local.postponed_calls:
func()
finally:
del _postponed_local.postponed_calls
def _create(self, id, **kw):
self.sqlmeta._creating = True
self._SO_createValues = {}
self._SO_validatorState = sqlbuilder.SQLObjectState(self)
# First we do a little fix-up on the keywords we were
# passed:
for column in self.sqlmeta.columnList:
# Then we check if the column wasn't passed in, and
# if not we try to get the default.
if column.name not in kw and column.foreignName not in kw:
default = column.default
# If we don't get it, it's an error:
# If we specified an SQL DEFAULT, then we should use that
if default is NoDefault:
if column.defaultSQL is None:
raise TypeError, "%s() did not get expected keyword argument '%s'" % (self.__class__.__name__, column.name)
else:
# There is defaultSQL for the column - do not put
# the column to kw so that the backend creates the value
continue
# Otherwise we put it in as though they did pass
# that keyword:
kw[column.name] = default
self.set(**kw)
# Then we finalize the process:
self._SO_finishCreate(id)
def _SO_finishCreate(self, id=None):
# Here's where an INSERT is finalized.
# These are all the column values that were supposed
# to be set, but were delayed until now:
setters = self._SO_createValues.items()
# Here's their database names:
names = [self.sqlmeta.columns[v[0]].dbName for v in setters]
values = [v[1] for v in setters]
# Get rid of _SO_create*, we aren't creating anymore.
# Doesn't have to be threadsafe because we're still in
# new(), which doesn't need to be threadsafe.
self.sqlmeta.dirty = False
if not self.sqlmeta.lazyUpdate:
del self._SO_createValues
else:
self._SO_createValues = {}
del self.sqlmeta._creating
# Do the insert -- most of the SQL in this case is left
# up to DBConnection, since getting a new ID is
# non-standard.
id = self._connection.queryInsertID(self,
id, names, values)
cache = self._connection.cache
cache.created(id, self.__class__, self)
self._init(id)
post_funcs = []
kw = dict([('class', self.__class__), ('id', id)])
def _send_RowCreatedSignal():
self.sqlmeta.send(events.RowCreatedSignal, self, kw, post_funcs)
for func in post_funcs:
func(self)
_postponed_local.postponed_calls.append(_send_RowCreatedSignal)
def _SO_getID(self, obj, refColumn=None):
return getID(obj, refColumn)
@classmethod
def _findAlternateID(cls, name, dbName, value, connection=None):
if isinstance(name, str):
name = (name,)
value = (value,)
if len(name) != len(value):
raise ValueError, "'column' and 'value' tuples must be of the same size"
new_value = []
for n, v in zip(name, value):
from_python = getattr(cls, '_SO_from_python_' + n)
if from_python:
v = from_python(v, sqlbuilder.SQLObjectState(cls, connection=connection))
new_value.append(v)
condition = sqlbuilder.AND(*[getattr(cls.q, n)==v for n,v in zip(name, new_value)])
return (connection or cls._connection)._SO_selectOneAlt(
cls,
[cls.sqlmeta.idName] +
[column.dbName for column in cls.sqlmeta.columnList],
condition), None
@classmethod
def _SO_fetchAlternateID(cls, name, dbName, value, connection=None, idxName=None):
result, obj = cls._findAlternateID(name, dbName, value, connection)
if not result:
if idxName is None:
raise SQLObjectNotFound, "The %s by alternateID %s = %s does not exist" % (cls.__name__, name, repr(value))
else:
names = []
for i in xrange(len(name)):
names.append("%s = %s" % (name[i], repr(value[i])))
names = ', '.join(names)
raise SQLObjectNotFound, "The %s by unique index %s(%s) does not exist" % (cls.__name__, idxName, names)
if obj:
return obj
if connection:
obj = cls.get(result[0], connection=connection, selectResults=result[1:])
else:
obj = cls.get(result[0], selectResults=result[1:])
return obj
@classmethod
def _SO_depends(cls):
return findDependencies(cls.__name__, cls.sqlmeta.registry)
@classmethod
def select(cls, clause=None, clauseTables=None,
orderBy=NoDefault, limit=None,
lazyColumns=False, reversed=False,
distinct=False, connection=None,
join=None, forUpdate=False):
return cls.SelectResultsClass(cls, clause,
clauseTables=clauseTables,
orderBy=orderBy,
limit=limit,
lazyColumns=lazyColumns,
reversed=reversed,
distinct=distinct,
connection=connection,
join=join, forUpdate=forUpdate)
@classmethod
def selectBy(cls, connection=None, **kw):
conn = connection or cls._connection
return cls.SelectResultsClass(cls,
conn._SO_columnClause(cls, kw),
connection=conn)
@classmethod
def tableExists(cls, connection=None):
conn = connection or cls._connection
return conn.tableExists(cls.sqlmeta.table)
@classmethod
def dropTable(cls, ifExists=False, dropJoinTables=True, cascade=False,
connection=None):
conn = connection or cls._connection
if ifExists and not cls.tableExists(connection=conn):
return
extra_sql = []
post_funcs = []
cls.sqlmeta.send(events.DropTableSignal, cls, connection,
extra_sql, post_funcs)
conn.dropTable(cls.sqlmeta.table, cascade)
if dropJoinTables:
cls.dropJoinTables(ifExists=ifExists, connection=conn)
for sql in extra_sql:
connection.query(sql)
for func in post_funcs:
func(cls, conn)
@classmethod
def createTable(cls, ifNotExists=False, createJoinTables=True,
createIndexes=True, applyConstraints=True,
connection=None):
conn = connection or cls._connection
if ifNotExists and cls.tableExists(connection=conn):
return
extra_sql = []
post_funcs = []
cls.sqlmeta.send(events.CreateTableSignal, cls, connection,
extra_sql, post_funcs)
constraints = conn.createTable(cls)
if applyConstraints:
for constraint in constraints:
conn.query(constraint)
else:
extra_sql.extend(constraints)
if createJoinTables:
cls.createJoinTables(ifNotExists=ifNotExists,
connection=conn)
if createIndexes:
cls.createIndexes(ifNotExists=ifNotExists,
connection=conn)
for func in post_funcs:
func(cls, conn)
return extra_sql
@classmethod
def createTableSQL(cls, createJoinTables=True, createIndexes=True,
connection=None):
conn = connection or cls._connection
sql, constraints = conn.createTableSQL(cls)
if createJoinTables:
join_sql = cls.createJoinTablesSQL(connection=conn)
if join_sql:
sql += ';\n' + join_sql
if createIndexes:
index_sql = cls.createIndexesSQL(connection=conn)
if index_sql:
sql += ';\n' + index_sql
return sql, constraints
@classmethod
def createJoinTables(cls, ifNotExists=False, connection=None):
conn = connection or cls._connection
for join in cls._getJoinsToCreate():
if (ifNotExists and
conn.tableExists(join.intermediateTable)):
continue
conn._SO_createJoinTable(join)
@classmethod
def createJoinTablesSQL(cls, connection=None):
conn = connection or cls._connection
sql = []
for join in cls._getJoinsToCreate():
sql.append(conn._SO_createJoinTableSQL(join))
return ';\n'.join(sql)
@classmethod
def createIndexes(cls, ifNotExists=False, connection=None):
conn = connection or cls._connection
for index in cls.sqlmeta.indexes:
if not index:
continue
conn._SO_createIndex(cls, index)
@classmethod
def createIndexesSQL(cls, connection=None):
conn = connection or cls._connection
sql = []
for index in cls.sqlmeta.indexes:
if not index:
continue
sql.append(conn.createIndexSQL(cls, index))
return ';\n'.join(sql)
@classmethod
def _getJoinsToCreate(cls):
joins = []
for join in cls.sqlmeta.joins:
if not join:
continue
if not join.hasIntermediateTable() or not getattr(join, 'createRelatedTable', True):
continue
if join.soClass.__name__ > join.otherClass.__name__:
continue
joins.append(join)
return joins
@classmethod
def dropJoinTables(cls, ifExists=False, connection=None):
conn = connection or cls._connection
for join in cls.sqlmeta.joins:
if not join:
continue
if not join.hasIntermediateTable() or not getattr(join, 'createRelatedTable', True):
continue
if join.soClass.__name__ > join.otherClass.__name__:
continue
if ifExists and \
not conn.tableExists(join.intermediateTable):
continue
conn._SO_dropJoinTable(join)
@classmethod
def clearTable(cls, connection=None, clearJoinTables=True):
# 3-03 @@: Maybe this should check the cache... but it's
# kind of crude anyway, so...
conn = connection or cls._connection
conn.clearTable(cls.sqlmeta.table)
if clearJoinTables:
for join in cls._getJoinsToCreate():
conn.clearTable(join.intermediateTable)
def destroySelf(self):
post_funcs = []
self.sqlmeta.send(events.RowDestroySignal, self, post_funcs)
# Kills this object. Kills it dead!
klass = self.__class__
# Free related joins on the base class
for join in klass.sqlmeta.joins:
if isinstance(join, joins.SORelatedJoin):
q = "DELETE FROM %s WHERE %s=%d" % (join.intermediateTable, join.joinColumn, self.id)
self._connection.query(q)
depends = []
depends = self._SO_depends()
for k in depends:
# Free related joins
for join in k.sqlmeta.joins:
if isinstance(join, joins.SORelatedJoin) and join.otherClassName == klass.__name__:
q = "DELETE FROM %s WHERE %s=%d" % (join.intermediateTable, join.otherColumn, self.id)
self._connection.query(q)
cols = findDependantColumns(klass.__name__, k)
# Don't confuse the rest of the process
if len(cols) == 0:
continue
query = []
delete = setnull = restrict = False
for col in cols:
if col.cascade == False:
# Found a restriction
restrict = True
query.append(getattr(k.q, col.name) == self.id)
if col.cascade == 'null':
setnull = col.name
elif col.cascade:
delete = True
assert delete or setnull or restrict, (
"Class %s depends on %s accoriding to "
"findDependantColumns, but this seems inaccurate"
% (k, klass))
query = sqlbuilder.OR(*query)
results = k.select(query, connection=self._connection)
if restrict:
if results.count():
# Restrictions only apply if there are
# matching records on the related table
raise SQLObjectIntegrityError, (
"Tried to delete %s::%s but "
"table %s has a restriction against it" %
(klass.__name__, self.id, k.__name__))
else:
for row in results:
if delete:
row.destroySelf()
else:
row.set(**{setnull: None})
self.sqlmeta._obsolete = True
self._connection._SO_delete(self)
self._connection.cache.expire(self.id, self.__class__)
for func in post_funcs:
func(self)
post_funcs = []
self.sqlmeta.send(events.RowDestroyedSignal, self, post_funcs)
for func in post_funcs:
func(self)
@classmethod
def delete(cls, id, connection=None):
obj = cls.get(id, connection=connection)
obj.destroySelf()
@classmethod
def deleteMany(cls, where=NoDefault, connection=None):
conn = connection or cls._connection
conn.query(conn.sqlrepr(sqlbuilder.Delete(cls.sqlmeta.table, where)))
@classmethod
def deleteBy(cls, connection=None, **kw):
conn = connection or cls._connection
conn.query(conn.sqlrepr(sqlbuilder.Delete(cls.sqlmeta.table,
conn._SO_columnClause(cls, kw))))
def __repr__(self):
if not hasattr(self, 'id'):
# Object initialization not finished. No attributes can be read.
return '<%s (not initialized)>' % self.__class__.__name__
return '<%s %r %s>' \
% (self.__class__.__name__,
self.id,
' '.join(['%s=%s' % (name, repr(value)) for name, value in self._reprItems()]))
def __sqlrepr__(self, db):
return str(self.id)
@classmethod
def sqlrepr(cls, value, connection=None):
return (connection or cls._connection).sqlrepr(value)
@classmethod
def coerceID(cls, value):
if isinstance(value, cls):
return value.id
else:
return cls.sqlmeta.idType(value)
def _reprItems(self):
items = []
for col in self.sqlmeta.columnList:
value = getattr(self, col.name)
r = repr(value)
if len(r) > 20:
value = r[:17] + "..." + r[-1]
items.append((col.name, value))
return items
@classmethod
def setConnection(cls, value):
if isinstance(value, basestring):
value = dbconnection.connectionForURI(value)
cls._connection = value
def tablesUsedImmediate(self):
return [self.__class__.q]
# Comparison
def __eq__(self, other):
if self.__class__ is other.__class__:
if self.id == other.id:
return True
return False
def __ne__(self, other):
return not self.__eq__(other)
def __lt__(self, other):
return NotImplemented
def __le__(self, other):
return NotImplemented
def __gt__(self, other):
return NotImplemented
def __ge__(self, other):
return NotImplemented
# (De)serialization (pickle, etc.)
def __getstate__(self):
if self.sqlmeta._perConnection:
from pickle import PicklingError
raise PicklingError('Cannot pickle an SQLObject instance that has a per-instance connection')
if self.sqlmeta.lazyUpdate and self._SO_createValues:
self.syncUpdate()
d = self.__dict__.copy()
del d['sqlmeta']
del d['_SO_validatorState']
del d['_SO_writeLock']
del d['_SO_createValues']
return d
def __setstate__(self, d):
self.__init__(_SO_fetch_no_create=1)
self._SO_validatorState = sqlbuilder.SQLObjectState(self)
self._SO_writeLock = threading.Lock()
self._SO_createValues = {}
self.__dict__.update(d)
cls = self.__class__
cache = self._connection.cache
if cache.tryGet(self.id, cls) is not None:
raise ValueError(
"Cannot unpickle %s row with id=%s - a different instance with the id already exists in the cache" % (cls.__name__, self.id))
cache.created(self.id, cls, self)
def setterName(name):
return '_set_%s' % name
def rawSetterName(name):
return '_SO_set_%s' % name
def getterName(name):
return '_get_%s' % name
def rawGetterName(name):
return '_SO_get_%s' % name
def instanceName(name):
return '_SO_val_%s' % name
########################################
## Utility functions (for external consumption)
########################################
def getID(obj, refColumn=None):
if isinstance(obj, SQLObject):
return getattr(obj, refColumn or 'id')
elif isinstance(obj, int):
return obj
elif isinstance(obj, long):
return int(obj)
elif isinstance(obj, str):
try:
return int(obj)
except ValueError:
return obj
elif obj is None:
return None
def getObject(obj, klass):
if isinstance(obj, int):
return klass(obj)
elif isinstance(obj, long):
return klass(int(obj))
elif isinstance(obj, str):
return klass(int(obj))
elif obj is None:
return None
else:
return obj
__all__ = ['NoDefault', 'SQLObject',
'SQLObjectIntegrityError', 'SQLObjectNotFound',
'getID', 'getObject', 'sqlhub', 'sqlmeta',
]
|