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158 lines
4.8 KiB
158 lines
4.8 KiB
"""
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Peewee integration with APSW, "another python sqlite wrapper".
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Project page: https://rogerbinns.github.io/apsw/
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APSW is a really neat library that provides a thin wrapper on top of SQLite's
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C interface.
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Here are just a few reasons to use APSW, taken from the documentation:
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* APSW gives all functionality of SQLite, including virtual tables, virtual
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file system, blob i/o, backups and file control.
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* Connections can be shared across threads without any additional locking.
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* Transactions are managed explicitly by your code.
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* APSW can handle nested transactions.
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* Unicode is handled correctly.
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* APSW is faster.
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"""
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import apsw
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from peewee import *
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from peewee import __exception_wrapper__
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from peewee import BooleanField as _BooleanField
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from peewee import DateField as _DateField
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from peewee import DateTimeField as _DateTimeField
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from peewee import DecimalField as _DecimalField
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from peewee import Insert
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from peewee import TimeField as _TimeField
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from peewee import logger
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from playhouse.sqlite_ext import SqliteExtDatabase
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class APSWDatabase(SqliteExtDatabase):
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server_version = tuple(int(i) for i in apsw.sqlitelibversion().split('.'))
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def __init__(self, database, **kwargs):
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self._modules = {}
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super(APSWDatabase, self).__init__(database, **kwargs)
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def register_module(self, mod_name, mod_inst):
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self._modules[mod_name] = mod_inst
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if not self.is_closed():
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self.connection().createmodule(mod_name, mod_inst)
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def unregister_module(self, mod_name):
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del(self._modules[mod_name])
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def _connect(self):
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conn = apsw.Connection(self.database, **self.connect_params)
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if self._timeout is not None:
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conn.setbusytimeout(self._timeout * 1000)
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try:
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self._add_conn_hooks(conn)
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except:
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conn.close()
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raise
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return conn
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def _add_conn_hooks(self, conn):
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super(APSWDatabase, self)._add_conn_hooks(conn)
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self._load_modules(conn) # APSW-only.
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def _load_modules(self, conn):
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for mod_name, mod_inst in self._modules.items():
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conn.createmodule(mod_name, mod_inst)
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return conn
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def _load_aggregates(self, conn):
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for name, (klass, num_params) in self._aggregates.items():
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def make_aggregate():
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return (klass(), klass.step, klass.finalize)
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conn.createaggregatefunction(name, make_aggregate)
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def _load_collations(self, conn):
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for name, fn in self._collations.items():
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conn.createcollation(name, fn)
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def _load_functions(self, conn):
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for name, (fn, num_params) in self._functions.items():
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conn.createscalarfunction(name, fn, num_params)
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def _load_extensions(self, conn):
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conn.enableloadextension(True)
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for extension in self._extensions:
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conn.loadextension(extension)
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def load_extension(self, extension):
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self._extensions.add(extension)
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if not self.is_closed():
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conn = self.connection()
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conn.enableloadextension(True)
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conn.loadextension(extension)
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def last_insert_id(self, cursor, query_type=None):
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if not self.returning_clause:
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return cursor.getconnection().last_insert_rowid()
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elif query_type == Insert.SIMPLE:
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try:
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return cursor[0][0]
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except (AttributeError, IndexError, TypeError):
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pass
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return cursor
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def rows_affected(self, cursor):
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try:
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return cursor.getconnection().changes()
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except AttributeError:
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return cursor.cursor.getconnection().changes() # RETURNING query.
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def begin(self, lock_type='deferred'):
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self.cursor().execute('begin %s;' % lock_type)
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def commit(self):
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with __exception_wrapper__:
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curs = self.cursor()
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if curs.getconnection().getautocommit():
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return False
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curs.execute('commit;')
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return True
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def rollback(self):
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with __exception_wrapper__:
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curs = self.cursor()
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if curs.getconnection().getautocommit():
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return False
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curs.execute('rollback;')
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return True
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def execute_sql(self, sql, params=None, commit=True):
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logger.debug((sql, params))
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with __exception_wrapper__:
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cursor = self.cursor()
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cursor.execute(sql, params or ())
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return cursor
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def nh(s, v):
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if v is not None:
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return str(v)
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class BooleanField(_BooleanField):
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def db_value(self, v):
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v = super(BooleanField, self).db_value(v)
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if v is not None:
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return v and 1 or 0
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class DateField(_DateField):
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db_value = nh
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class TimeField(_TimeField):
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db_value = nh
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class DateTimeField(_DateTimeField):
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db_value = nh
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class DecimalField(_DecimalField):
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db_value = nh
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