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"""
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 __exception_wrapper__
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 Insert
from peewee import TimeField as _TimeField
from peewee import logger
from playhouse.sqlite_ext import SqliteExtDatabase
class APSWDatabase(SqliteExtDatabase):
server_version = tuple(int(i) for i in apsw.sqlitelibversion().split('.'))
def __init__(self, database, **kwargs):
self._modules = {}
super(APSWDatabase, self).__init__(database, **kwargs)
def register_module(self, mod_name, mod_inst):
self._modules[mod_name] = mod_inst
if not self.is_closed():
self.connection().createmodule(mod_name, mod_inst)
def unregister_module(self, mod_name):
del(self._modules[mod_name])
def _connect(self):
conn = apsw.Connection(self.database, **self.connect_params)
if self._timeout is not None:
conn.setbusytimeout(self._timeout * 1000)
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():
return (klass(), klass.step, klass.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.connection()
conn.enableloadextension(True)
conn.loadextension(extension)
def last_insert_id(self, cursor, query_type=None):
if not self.returning_clause:
return cursor.getconnection().last_insert_rowid()
elif query_type == Insert.SIMPLE:
try:
return cursor[0][0]
except (AttributeError, IndexError, TypeError):
pass
return cursor
def rows_affected(self, cursor):
try:
return cursor.getconnection().changes()
except AttributeError:
return cursor.cursor.getconnection().changes() # RETURNING query.
def begin(self, lock_type='deferred'):
self.cursor().execute('begin %s;' % lock_type)
def commit(self):
with __exception_wrapper__:
curs = self.cursor()
if curs.getconnection().getautocommit():
return False
curs.execute('commit;')
return True
def rollback(self):
with __exception_wrapper__:
curs = self.cursor()
if curs.getconnection().getautocommit():
return False
curs.execute('rollback;')
return True
def execute_sql(self, sql, params=None):
logger.debug((sql, params))
with __exception_wrapper__:
cursor = self.cursor()
cursor.execute(sql, params or ())
return cursor
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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