Current File : //opt/alt/python35/lib64/python3.5/site-packages/playhouse/apsw_ext.py
"""
Peewee integration with APSW, "another python sqlite wrapper".
Project page: https://rogerbinns.github.io/apsw/
APSW is a really neat library that provides a thin wrapper on top of SQLite's
C interface.
Here are just a few reasons to use APSW, taken from the documentation:
* APSW gives all functionality of SQLite, including virtual tables, virtual
file system, blob i/o, backups and file control.
* Connections can be shared across threads without any additional locking.
* Transactions are managed explicitly by your code.
* APSW can handle nested transactions.
* Unicode is handled correctly.
* APSW is faster.
"""
import apsw
from peewee import *
from peewee import _sqlite_date_part
from peewee import _sqlite_date_trunc
from peewee import _sqlite_regexp
from peewee import BooleanField as _BooleanField
from peewee import DateField as _DateField
from peewee import DateTimeField as _DateTimeField
from peewee import DecimalField as _DecimalField
from peewee import logger
from peewee import savepoint
from peewee import TimeField as _TimeField
from peewee import transaction as _transaction
from playhouse.sqlite_ext import SqliteExtDatabase
from playhouse.sqlite_ext import VirtualCharField
from playhouse.sqlite_ext import VirtualField
from playhouse.sqlite_ext import VirtualFloatField
from playhouse.sqlite_ext import VirtualIntegerField
from playhouse.sqlite_ext import VirtualModel
class transaction(_transaction):
def __init__(self, db, lock_type='deferred'):
self.db = db
self.lock_type = lock_type
def _begin(self):
self.db.begin(self.lock_type)
class APSWDatabase(SqliteExtDatabase):
def __init__(self, database, timeout=None, **kwargs):
self.timeout = timeout
self._modules = {}
super(APSWDatabase, self).__init__(database, **kwargs)
def register_module(self, mod_name, mod_inst):
self._modules[mod_name] = mod_inst
def unregister_module(self, mod_name):
del(self._modules[mod_name])
def _connect(self, database, **kwargs):
conn = apsw.Connection(database, **kwargs)
if self.timeout is not None:
conn.setbusytimeout(self.timeout)
try:
self._add_conn_hooks(conn)
except:
conn.close()
raise
return conn
def _add_conn_hooks(self, conn):
super(APSWDatabase, self)._add_conn_hooks(conn)
self._load_modules(conn) # APSW-only.
def _load_modules(self, conn):
for mod_name, mod_inst in self._modules.items():
conn.createmodule(mod_name, mod_inst)
return conn
def _load_aggregates(self, conn):
for name, (klass, num_params) in self._aggregates.items():
def make_aggregate():
instance = klass()
return (instance, instance.step, instance.finalize)
conn.createaggregatefunction(name, make_aggregate)
def _load_collations(self, conn):
for name, fn in self._collations.items():
conn.createcollation(name, fn)
def _load_functions(self, conn):
for name, (fn, num_params) in self._functions.items():
conn.createscalarfunction(name, fn, num_params)
def _load_extensions(self, conn):
conn.enableloadextension(True)
for extension in self._extensions:
conn.loadextension(extension)
def load_extension(self, extension):
self._extensions.add(extension)
if not self.is_closed():
conn = self.get_conn()
conn.enableloadextension(True)
conn.loadextension(extension)
def _execute_sql(self, cursor, sql, params):
cursor.execute(sql, params or ())
return cursor
def execute_sql(self, sql, params=None, require_commit=True):
logger.debug((sql, params))
with self.exception_wrapper():
cursor = self.get_cursor()
self._execute_sql(cursor, sql, params)
return cursor
def last_insert_id(self, cursor, model):
if model._meta.auto_increment:
return cursor.getconnection().last_insert_rowid()
def rows_affected(self, cursor):
return cursor.getconnection().changes()
def begin(self, lock_type='deferred'):
self.get_cursor().execute('begin %s;' % lock_type)
def commit(self):
self.get_cursor().execute('commit;')
def rollback(self):
self.get_cursor().execute('rollback;')
def transaction(self, lock_type='deferred'):
return transaction(self, lock_type)
def savepoint(self, sid=None):
return savepoint(self, sid)
def nh(s, v):
if v is not None:
return str(v)
class BooleanField(_BooleanField):
def db_value(self, v):
v = super(BooleanField, self).db_value(v)
if v is not None:
return v and 1 or 0
class DateField(_DateField):
db_value = nh
class TimeField(_TimeField):
db_value = nh
class DateTimeField(_DateTimeField):
db_value = nh
class DecimalField(_DecimalField):
db_value = nh
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