Current File : //opt/alt/python35/lib64/python3.5/site-packages/playhouse/berkeleydb.py
import ctypes
import datetime
import decimal
import sys
from peewee import ImproperlyConfigured
from peewee import sqlite3
from playhouse.sqlite_ext import *
sqlite3_lib_version = sqlite3.sqlite_version_info
# Peewee assumes that the `pysqlite2` module was compiled against the
# BerkeleyDB SQLite libraries.
try:
from pysqlite2 import dbapi2 as berkeleydb
except ImportError:
import sqlite3 as berkeleydb
berkeleydb.register_adapter(decimal.Decimal, str)
berkeleydb.register_adapter(datetime.date, str)
berkeleydb.register_adapter(datetime.time, str)
class BerkeleyDatabase(SqliteExtDatabase):
def __init__(self, database, pragmas=None, cache_size=None, page_size=None,
multiversion=None, *args, **kwargs):
super(BerkeleyDatabase, self).__init__(
database, pragmas=pragmas, *args, **kwargs)
if multiversion:
self._pragmas.append(('multiversion', 'on'))
if page_size:
self._pragmas.append(('page_size', page_size))
if cache_size:
self._pragmas.append(('cache_size', cache_size))
def _connect(self, database, **kwargs):
if not PYSQLITE_BERKELEYDB:
message = ('Your Python SQLite driver (%s) does not appear to '
'have been compiled against the BerkeleyDB SQLite '
'library.' % berkeleydb)
if LIBSQLITE_BERKELEYDB:
message += (' However, the libsqlite on your system is the '
'BerkeleyDB implementation. Try recompiling '
'pysqlite.')
else:
message += (' Additionally, the libsqlite on your system '
'does not appear to be the BerkeleyDB '
'implementation.')
raise ImproperlyConfigured(message)
conn = berkeleydb.connect(database, **kwargs)
conn.isolation_level = None
self._add_conn_hooks(conn)
return conn
def _set_pragmas(self, conn):
# `multiversion` is weird. It checks first whether another connection
# from the BTree cache is available, and then switches to that, which
# may have the handle of the DB_Env. If that happens, then we get
# an error stating that you cannot set `multiversion` despite the
# fact we have not done any operations and it's a brand new conn.
if self._pragmas:
cursor = conn.cursor()
for pragma, value in self._pragmas:
if pragma == 'multiversion':
try:
cursor.execute('PRAGMA %s = %s;' % (pragma, value))
except berkeleydb.OperationalError:
pass
else:
cursor.execute('PRAGMA %s = %s;' % (pragma, value))
cursor.close()
@classmethod
def check_pysqlite(cls):
try:
from pysqlite2 import dbapi2 as sqlite3
except ImportError:
import sqlite3
conn = sqlite3.connect(':memory:')
try:
results = conn.execute('PRAGMA compile_options;').fetchall()
finally:
conn.close()
for option, in results:
if option == 'BERKELEY_DB':
return True
return False
@classmethod
def check_libsqlite(cls):
# Checking compile options is not supported.
if sys.platform.startswith('win'):
library = 'libsqlite3.dll'
elif sys.platform == 'darwin':
library = 'libsqlite3.dylib'
else:
library = 'libsqlite3.so'
try:
libsqlite = ctypes.CDLL(library)
except OSError:
return False
return libsqlite.sqlite3_compileoption_used('BERKELEY_DB') == 1
if sqlite3_lib_version < (3, 6, 23):
# Checking compile flags is not supported in older SQLite versions.
PYSQLITE_BERKELEYDB = False
LIBSQLITE_BERKELEYDB = False
else:
PYSQLITE_BERKELEYDB = BerkeleyDatabase.check_pysqlite()
LIBSQLITE_BERKELEYDB = BerkeleyDatabase.check_libsqlite()
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