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
|
##############################################################################
#
# Zope Public License (ZPL) Version 1.0
# -------------------------------------
#
# Copyright (c) Digital Creations. All rights reserved.
#
# This license has been certified as Open Source(tm).
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions in source code must retain the above copyright
# notice, this list of conditions, and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions, and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# 3. Digital Creations requests that attribution be given to Zope
# in any manner possible. Zope includes a "Powered by Zope"
# button that is installed by default. While it is not a license
# violation to remove this button, it is requested that the
# attribution remain. A significant investment has been put
# into Zope, and this effort will continue if the Zope community
# continues to grow. This is one way to assure that growth.
#
# 4. All advertising materials and documentation mentioning
# features derived from or use of this software must display
# the following acknowledgement:
#
# "This product includes software developed by Digital Creations
# for use in the Z Object Publishing Environment
# (http://www.zope.org/)."
#
# In the event that the product being advertised includes an
# intact Zope distribution (with copyright and license included)
# then this clause is waived.
#
# 5. Names associated with Zope or Digital Creations must not be used to
# endorse or promote products derived from this software without
# prior written permission from Digital Creations.
#
# 6. Modified redistributions of any form whatsoever must retain
# the following acknowledgment:
#
# "This product includes software developed by Digital Creations
# for use in the Z Object Publishing Environment
# (http://www.zope.org/)."
#
# Intact (re-)distributions of any official Zope release do not
# require an external acknowledgement.
#
# 7. Modifications are encouraged but must be packaged separately as
# patches to official Zope releases. Distributions that do not
# clearly separate the patches from the original work must be clearly
# labeled as unofficial distributions. Modifications which do not
# carry the name Zope may be packaged in any form, as long as they
# conform to all of the clauses above.
#
#
# Disclaimer
#
# THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS ``AS IS'' AND ANY
# EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL CREATIONS OR ITS
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#
# This software consists of contributions made by Digital Creations and
# many individuals on behalf of Digital Creations. Specific
# attributions are listed in the accompanying credits file.
#
##############################################################################
'''$Id: db.py 649 2010-11-10 02:27:54Z eikenberry $'''
__version__='$Revision: 649 $'[11:-2]
import time
import _mysql
import MySQLdb
from _mysql_exceptions import (OperationalError, NotSupportedError,
ProgrammingError)
MySQLdb_version_required = (1,2,1)
try:
MySQLdb_version = MySQLdb.version_info[:3]
except AttributeError:
MySQLdb_version = getattr(_mysql, 'version_info', (0,0,0))
if MySQLdb_version < MySQLdb_version_required:
raise NotSupportedError, \
"ZMySQLDA requires at least MySQLdb %s, %s found" % \
(MySQLdb_version_required, _v)
from MySQLdb.converters import conversions
from MySQLdb.constants import FIELD_TYPE, CR, ER, CLIENT, FLAG
from ZODB.POSException import ConflictError
from DateTime import DateTime
from thread import get_ident, allocate_lock
import logging
LOG = logging.getLogger('ZMySQLDA')
from joinTM import joinTM
hosed_connection = {
CR.SERVER_GONE_ERROR: "Server gone.",
CR.SERVER_LOST: "Server lost.",
CR.COMMANDS_OUT_OF_SYNC: ("Commands out of sync. Possibly a misplaced"
" semicolon (;) in a query."),
}
query_syntax_error = (
ER.BAD_FIELD_ERROR,
)
key_types = {
"PRI": "PRIMARY KEY",
"MUL": "INDEX",
"UNI": "UNIQUE",
}
field_icons = "bin", "date", "datetime", "float", "int", "text", "time"
icon_xlate = {
"varchar": "text", "char": "text",
"enum": "what", "set": "what",
"double": "float", "numeric": "float",
"blob": "bin", "mediumblob": "bin", "longblob": "bin",
"tinytext": "text", "mediumtext": "text",
"longtext": "text", "timestamp": "datetime",
"decimal": "float", "smallint": "int",
"mediumint": "int", "bigint": "int",
}
type_xlate = {
"double": "float", "numeric": "float",
"decimal": "float", "smallint": "int",
"mediumint": "int", "bigint": "int",
"int": "int", "float": "float",
"timestamp": "datetime", "datetime": "datetime",
"time": "datetime",
}
def _mysql_timestamp_converter(s):
if len(s) < 14:
s = s + "0"*(14-len(s))
parts = map(int, (s[:4],s[4:6],s[6:8],
s[8:10],s[10:12],s[12:14]))
return DateTime("%04d-%02d-%02d %02d:%02d:%02d" % tuple(parts))
def DateTime_or_None(s):
try: return DateTime(s)
except: return None
def int_or_long(s):
try: return int(s)
except: return long(s)
class DBPool(object):
"""
This class is an interface to DB.
Its caracteristic is that an instance of this class interfaces multiple
instanes of DB class, each one being bound to a specific thread.
"""
connected_timestamp = ''
_create_db = False
use_unicode = False
def __init__(self, db_cls, create_db=False, use_unicode=False):
""" Set transaction managed DB class for use in pool.
"""
self.DB = db_cls
# pool of one db object/thread
self._db_pool = {}
self._db_lock = allocate_lock()
# auto-create db if not present on server
self._create_db = create_db
# unicode settings
self.use_unicode = use_unicode
def __call__(self, connection):
""" Parse the connection string.
Initiate a trial connection with the database to check
transactionality once instead of once per DB instance.
Create database if option is enabled and database doesn't exist.
"""
self.connection = connection
DB = self.DB
#
db_flags = DB._parse_connection_string(connection, self.use_unicode)
self._db_flags = db_flags
# connect to server to determin tranasactional capabilities
# can't use DB instance as it requires this information to work
try:
connection = MySQLdb.connect(**db_flags['kw_args'])
except OperationalError:
if self._create_db:
kw_args = db_flags.get('kw_args',{}).copy()
db = kw_args.pop('db',None)
if not db: raise
connection = MySQLdb.connect(**kw_args)
create_query = "create database %s" % db
if self.use_unicode:
create_query += (" default character set %s"
% DB.unicode_charset)
connection.query(create_query)
connection.store_result()
else:
raise
transactional = connection.server_capabilities & CLIENT.TRANSACTIONS
connection.close()
# Some tweaks to transaction/locking db_flags based on server setup
if db_flags['try_transactions'] == '-':
transactional = False
elif not transactional and db_flags['try_transactions'] == '+':
raise NotSupportedError, "transactions not supported by this server"
db_flags['transactions'] = transactional
del db_flags['try_transactions']
if transactional or db_flags['mysql_lock']:
db_flags['use_TM'] = True
# will not be 100% accurate in regard to per thread connections
# but as close as we're going to get it.
self.connected_timestamp = DateTime()
# return self as the database connection object
# (assigned to _v_database_connection)
return self
def closeConnection(self):
""" Close this threads connection. Used when DA is being reused
but the connection string has changed. Need to close the DB
instances and recreate to the new database. Only have to worry
about this thread as when each thread hits the new connection
string in the DA this method will be called.
"""
ident = get_ident()
try:
self._pool_del(ident)
except KeyError:
pass
def close(self):
""" Used when manually closing the database. Resetting the pool
dereferences the DB instances where they are then collected
and closed.
"""
self._db_pool = {}
def _pool_set(self, key, value):
""" Add a db to pool.
"""
self._db_lock.acquire()
try:
self._db_pool[key] = value
finally:
self._db_lock.release()
def _pool_get(self, key):
""" Get db from pool. Read only, no lock necessary.
"""
return self._db_pool.get(key)
def _pool_del(self, key):
""" Remove db from pool.
"""
self._db_lock.acquire()
try:
del self._db_pool[key]
finally:
self._db_lock.release()
def name(self):
""" Return name of database connected to.
"""
return self._db_flags['kw_args']['db']
# Passthrough aliases for methods on DB class.
def variables(self, *args, **kw):
return self._access_db(method_id='variables', args=args, kw=kw)
def tables(self, *args, **kw):
return self._access_db(method_id='tables', args=args, kw=kw)
def columns(self, *args, **kw):
return self._access_db(method_id='columns', args=args, kw=kw)
def query(self, *args, **kw):
return self._access_db(method_id='query', args=args, kw=kw)
def string_literal(self, *args, **kw):
return self._access_db(method_id='string_literal', args=args, kw=kw)
def unicode_literal(self, *args, **kw):
return self._access_db(method_id='unicode_literal', args=args, kw=kw)
def _access_db(self, method_id, args, kw):
"""
Generic method to call pooled objects' methods.
When the current thread had never issued any call, create a DB
instance.
"""
ident = get_ident()
db = self._pool_get(ident)
if db is None:
db = self.DB(**self._db_flags)
self._pool_set(ident, db)
return getattr(db, method_id)(*args, **kw)
class DB(joinTM):
Database_Error=_mysql.Error
defs={
FIELD_TYPE.CHAR: "i", FIELD_TYPE.DATE: "d", FIELD_TYPE.DATETIME: "d",
FIELD_TYPE.DECIMAL: "n", FIELD_TYPE.NEWDECIMAL: "n",
FIELD_TYPE.DOUBLE: "n", FIELD_TYPE.FLOAT: "n", FIELD_TYPE.INT24: "i",
FIELD_TYPE.LONG: "i", FIELD_TYPE.LONGLONG: "l",
FIELD_TYPE.SHORT: "i", FIELD_TYPE.TIMESTAMP: "d",
FIELD_TYPE.TINY: "i", FIELD_TYPE.YEAR: "i",
}
conv=conversions.copy()
conv[FIELD_TYPE.LONG] = int_or_long
conv[FIELD_TYPE.DATETIME] = DateTime_or_None
conv[FIELD_TYPE.DATE] = DateTime_or_None
conv[FIELD_TYPE.DECIMAL] = float
conv[FIELD_TYPE.NEWDECIMAL] = float
del conv[FIELD_TYPE.TIME]
# compatibility/fix for older mysqldb versions
# without this you can get character arrays for some values
# eg. group_concat()
if MySQLdb_version < (1, 2, 2):
conv[FIELD_TYPE.BLOB][0] = (FLAG.BINARY, str)
_p_oid=_p_changed=_registered=None
unicode_charset = 'utf8' # hardcoded for now
def __init__(self, connection=None, kw_args=None, use_TM=None,
mysql_lock=None, transactions=None):
self.connection = connection # backwards compat
self._kw_args = kw_args
self._mysql_lock = mysql_lock
self._use_TM = use_TM
self._transactions = transactions
self._forceReconnection()
def close(self):
""" Close connection and dereference.
"""
if getattr(self,'db',None):
self.db.close()
self.db = None
__del__ = close
def _forceReconnection(self):
""" (Re)Connect to database.
"""
try: # try to clean up first
self.db.close()
except: pass
self.db = MySQLdb.connect(**self._kw_args)
# Newer mysqldb requires ping argument to attmept a reconnect.
# This setting is persistent, so only needed once per connection.
if MySQLdb_version >= (1, 2, 2):
self.db.ping(True)
@classmethod
def _parse_connection_string(cls, connection, use_unicode=False):
""" Done as a class method to both allow access to class attribute
conv (conversion) settings while allowing for wrapping pool class
use of this method. The former is important to allow for subclasses
to override the conv settings while the latter is important so
the connection string doesn't have to be parsed for each instance
in the pool.
"""
kw_args = {'conv':cls.conv}
flags = {'kw_args':kw_args, 'connection':connection}
if use_unicode:
kw_args['use_unicode'] = use_unicode
kw_args['charset'] = cls.unicode_charset
items = connection.split()
flags['use_TM'] = None
if _mysql.get_client_info()[0] >= '5':
kw_args['client_flag'] = CLIENT.MULTI_STATEMENTS
if items:
lockreq, items = items[0], items[1:]
if lockreq[0] == "*":
flags['mysql_lock'] = lockreq[1:]
db_host, items = items[0], items[1:]
flags['use_TM'] = True # redundant. eliminate?
else:
flags['mysql_lock'] = None
db_host = lockreq
if '@' in db_host:
db, host = db_host.split('@',1)
kw_args['db'] = db
if ':' in host:
host, port = host.split(':',1)
kw_args['port'] = int(port)
kw_args['host'] = host
else:
kw_args['db'] = db_host
if kw_args['db'] and kw_args['db'][0] in ('+', '-'):
flags['try_transactions'] = kw_args['db'][0]
kw_args['db'] = kw_args['db'][1:]
else:
flags['try_transactions'] = None
if not kw_args['db']:
del kw_args['db']
if items:
kw_args['user'], items = items[0], items[1:]
if items:
kw_args['passwd'], items = items[0], items[1:]
if items:
kw_args['unix_socket'], items = items[0], items[1:]
return flags
def tables(self, rdb=0,
_care=('TABLE', 'VIEW')):
""" Returns list of tables.
"""
r=[]
a=r.append
result = self._query("SHOW TABLES")
row = result.fetch_row(1)
while row:
table_name = row[0][0]
a({'table_name': table_name, 'table_type': 'table'})
row = result.fetch_row(1)
return r
def columns(self, table_name):
""" Returns list of columns for [table_name].
"""
try:
# Field, Type, Null, Key, Default, Extra
c = self._query('SHOW COLUMNS FROM %s' % table_name)
except:
return ()
r=[]
for Field, Type, Null, Key, Default, Extra in c.fetch_row(0):
info = {}
field_default = ''
if Default is not None:
info['default'] = Default
field_default = "DEFAULT '%s'" % Default
if '(' in Type:
end = Type.rfind(')')
short_type, size = Type[:end].split('(',1)
if short_type not in ('set','enum'):
if ',' in size:
info['scale'], info['precision'] = \
map(int, size.split(',',1))
else:
info['scale'] = int(size)
else:
short_type = Type
if short_type in field_icons:
info['icon'] = short_type
else:
info['icon'] = icon_xlate.get(short_type, "what")
info['name'] = Field
info['type'] = short_type
info['extra'] = Extra,
info['description'] = ' '.join([Type, field_default, Extra or '',
key_types.get(Key, Key or ''),
Null == 'NO' and 'NOT NULL' or ''])
info['nullable'] = (Null == 'YES') and 1 or 0
if Key:
info['index'] = True
info['key'] = Key
if Key == 'PRI':
info['primary_key'] = True
info['unique'] = True
elif Key == 'UNI':
info['unique'] = True
r.append(info)
return r
def variables(self):
""" Return dictionary of current mysql variable/values.
"""
# variable_name, value
variables = self._query('SHOW VARIABLES')
return dict((name, value) for name, value in variables.fetch_row(0))
def _query(self, query, force_reconnect=False):
"""
Send a query to MySQL server.
It reconnects automaticaly if needed and the following conditions are
met:
- It has not just tried to reconnect (ie, this function will not
attempt to connect twice per call).
- This conection is not transactionnal and has set no MySQL locks,
because they are bound to the connection. This check can be
overridden by passing force_reconnect with True value.
"""
try:
self.db.query(query)
except OperationalError, m:
if m[0] in query_syntax_error:
raise OperationalError(m[0], '%s: %s' % (m[1], query))
if ((not force_reconnect) and \
(self._mysql_lock or self._transactions)) or \
m[0] not in hosed_connection:
LOG.warning('query failed: %s' % (query,))
raise
# Hm. maybe the db is hosed. Let's restart it.
if m[0] in hosed_connection:
LOG.error('%s Forcing a reconnect.' % hosed_connection[m[0]])
self._forceReconnection()
self.db.query(query)
except ProgrammingError, m:
if m[0] in hosed_connection:
self._forceReconnection()
LOG.error('%s Forcing a reconnect.' % hosed_connection[m[0]])
else:
LOG.warning('query failed: %s' % (query,))
raise
return self.db.store_result()
def query(self, query_string, max_rows=1000):
""" API method for making the query to mysql.
"""
self._use_TM and self._register()
desc=None
result=()
for qs in filter(None, [q.strip() for q in query_string.split('\0')]):
qtype = qs.split(None, 1)[0].upper()
if qtype == "SELECT" and max_rows:
qs = "%s LIMIT %d" % (qs,max_rows)
r=0
c = self._query(qs)
if desc is not None:
if c and (c.describe() != desc):
raise ProgrammingError(
'Multiple select schema are not allowed'
)
if c:
desc=c.describe()
result=c.fetch_row(max_rows)
else:
desc=None
if qtype == "CALL":
# For stored procedures, skip the status result
self.db.next_result()
if desc is None: return (),()
items=[]
func=items.append
defs=self.defs
for d in desc:
item={'name': d[0],
'type': defs.get(d[1],"t"),
'width': d[2],
'null': d[6]
}
func(item)
return items, result
def string_literal(self, s):
""" Called from zope to quote/escape strings for inclusion
in a query.
"""
return self.db.string_literal(s)
def unicode_literal(self, s):
""" Similar to string_literal but encodes it first.
"""
return self.db.unicode_literal(s)
# Zope 2-phase transaction handling methods
def _begin(self, *ignored):
""" Called from _register() upon first query.
"""
try:
self._transaction_begun = True
self.db.ping()
if self._transactions:
self._query("BEGIN")
if self._mysql_lock:
self._query("SELECT GET_LOCK('%s',0)" % self._mysql_lock)
except:
LOG.error("exception during _begin", exc_info=True)
raise ConflictError
def _finish(self, *ignored):
""" Called as final event in transaction system.
"""
if not self._transaction_begun:
return
self._transaction_begun = False
try:
if self._mysql_lock:
self._query("SELECT RELEASE_LOCK('%s')" % self._mysql_lock)
if self._transactions:
self._query("COMMIT")
except:
LOG.error("exception during _finish", exc_info=True)
raise ConflictError
def _abort(self, *ignored):
""" Called in case of transactional error.
"""
if not self._transaction_begun:
return
self._transaction_begun = False
if self._mysql_lock:
self._query("SELECT RELEASE_LOCK('%s')" % self._mysql_lock)
if self._transactions:
self._query("ROLLBACK")
else:
LOG.error("aborting when non-transactional")
def _mysql_version(self):
""" Return mysql server version.
Note instances of this class are not persistent.
"""
_version = getattr(self, '_version', None)
if not _version:
self._version = _version = self.variables().get('version')
return _version
def savepoint(self):
""" Basic savepoint support.
Raise AttributeErrors to trigger optimistic savepoint handling
in zope's transaction code.
"""
if self._mysql_version() < '5.0.2':
# mysql supports savepoints in versions 5.0.3+
LOG.warning("Savepoints unsupported with Mysql < 5.0.3")
raise AttributeError
if not self._transaction_begun:
LOG.error("Savepoint used outside of transaction.")
raise AttributeError
return _SavePoint(self)
class _SavePoint(object):
""" Simple savepoint object
"""
def __init__(self, dm):
self.dm = dm
self.ident = ident = str(time.time()).replace('.','sp')
dm._query("SAVEPOINT %s" % ident)
def rollback(self):
self.dm._query("ROLLBACK TO %s" % self.ident)
|