| #---------------------------------------------------------------------- |
| # Copyright (c) 1999-2001, Digital Creations, Fredericksburg, VA, USA |
| # and Andrew Kuchling. All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions are |
| # met: |
| # |
| # o Redistributions of source code must retain the above copyright |
| # notice, this list of conditions, and the disclaimer that follows. |
| # |
| # o 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. |
| # |
| # o Neither the name of Digital Creations nor the names of its |
| # contributors may be used to endorse or promote products derived |
| # from this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS AND CONTRIBUTORS *AS |
| # IS* AND ANY EXPRESS 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 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. |
| #---------------------------------------------------------------------- |
| |
| |
| """Support for BerkeleyDB 3.1 through 4.1. |
| """ |
| |
| try: |
| import _bsddb |
| except ImportError: |
| # Remove ourselves from sys.modules |
| import sys |
| del sys.modules[__name__] |
| raise |
| |
| # bsddb3 calls it db, but provide _db for backwards compatibility |
| db = _db = _bsddb |
| __version__ = db.__version__ |
| |
| error = db.DBError # So bsddb.error will mean something... |
| |
| #---------------------------------------------------------------------- |
| |
| |
| class _DBWithCursor: |
| """ |
| A simple wrapper around DB that makes it look like the bsddbobject in |
| the old module. It uses a cursor as needed to provide DB traversal. |
| """ |
| def __init__(self, db): |
| self.db = db |
| self.dbc = None |
| self.db.set_get_returns_none(0) |
| |
| def __del__(self): |
| self.close() |
| |
| def _checkCursor(self): |
| if self.dbc is None: |
| self.dbc = self.db.cursor() |
| |
| def _checkOpen(self): |
| if self.db is None: |
| raise error, "BSDDB object has already been closed" |
| |
| def isOpen(self): |
| return self.db is not None |
| |
| def __len__(self): |
| self._checkOpen() |
| return len(self.db) |
| |
| def __getitem__(self, key): |
| self._checkOpen() |
| return self.db[key] |
| |
| def __setitem__(self, key, value): |
| self._checkOpen() |
| self.db[key] = value |
| |
| def __delitem__(self, key): |
| self._checkOpen() |
| del self.db[key] |
| |
| def close(self): |
| if self.dbc is not None: |
| self.dbc.close() |
| v = 0 |
| if self.db is not None: |
| v = self.db.close() |
| self.dbc = None |
| self.db = None |
| return v |
| |
| def keys(self): |
| self._checkOpen() |
| return self.db.keys() |
| |
| def has_key(self, key): |
| self._checkOpen() |
| return self.db.has_key(key) |
| |
| def set_location(self, key): |
| self._checkOpen() |
| self._checkCursor() |
| return self.dbc.set(key) |
| |
| def next(self): |
| self._checkOpen() |
| self._checkCursor() |
| rv = self.dbc.next() |
| return rv |
| |
| def previous(self): |
| self._checkOpen() |
| self._checkCursor() |
| rv = self.dbc.prev() |
| return rv |
| |
| def first(self): |
| self._checkOpen() |
| self._checkCursor() |
| rv = self.dbc.first() |
| return rv |
| |
| def last(self): |
| self._checkOpen() |
| self._checkCursor() |
| rv = self.dbc.last() |
| return rv |
| |
| def sync(self): |
| self._checkOpen() |
| return self.db.sync() |
| |
| |
| #---------------------------------------------------------------------- |
| # Compatibility object factory functions |
| |
| def hashopen(file, flag='c', mode=0666, pgsize=None, ffactor=None, nelem=None, |
| cachesize=None, lorder=None, hflags=0): |
| |
| flags = _checkflag(flag) |
| d = db.DB() |
| d.set_flags(hflags) |
| if cachesize is not None: d.set_cachesize(0, cachesize) |
| if pgsize is not None: d.set_pagesize(pgsize) |
| if lorder is not None: d.set_lorder(lorder) |
| if ffactor is not None: d.set_h_ffactor(ffactor) |
| if nelem is not None: d.set_h_nelem(nelem) |
| d.open(file, db.DB_HASH, flags, mode) |
| return _DBWithCursor(d) |
| |
| #---------------------------------------------------------------------- |
| |
| def btopen(file, flag='c', mode=0666, |
| btflags=0, cachesize=None, maxkeypage=None, minkeypage=None, |
| pgsize=None, lorder=None): |
| |
| flags = _checkflag(flag) |
| d = db.DB() |
| if cachesize is not None: d.set_cachesize(0, cachesize) |
| if pgsize is not None: d.set_pagesize(pgsize) |
| if lorder is not None: d.set_lorder(lorder) |
| d.set_flags(btflags) |
| if minkeypage is not None: d.set_bt_minkey(minkeypage) |
| if maxkeypage is not None: d.set_bt_maxkey(maxkeypage) |
| d.open(file, db.DB_BTREE, flags, mode) |
| return _DBWithCursor(d) |
| |
| #---------------------------------------------------------------------- |
| |
| |
| def rnopen(file, flag='c', mode=0666, |
| rnflags=0, cachesize=None, pgsize=None, lorder=None, |
| rlen=None, delim=None, source=None, pad=None): |
| |
| flags = _checkflag(flag) |
| d = db.DB() |
| if cachesize is not None: d.set_cachesize(0, cachesize) |
| if pgsize is not None: d.set_pagesize(pgsize) |
| if lorder is not None: d.set_lorder(lorder) |
| d.set_flags(rnflags) |
| if delim is not None: d.set_re_delim(delim) |
| if rlen is not None: d.set_re_len(rlen) |
| if source is not None: d.set_re_source(source) |
| if pad is not None: d.set_re_pad(pad) |
| d.open(file, db.DB_RECNO, flags, mode) |
| return _DBWithCursor(d) |
| |
| #---------------------------------------------------------------------- |
| |
| |
| def _checkflag(flag): |
| if flag == 'r': |
| flags = db.DB_RDONLY |
| elif flag == 'rw': |
| flags = 0 |
| elif flag == 'w': |
| flags = db.DB_CREATE |
| elif flag == 'c': |
| flags = db.DB_CREATE |
| elif flag == 'n': |
| flags = db.DB_CREATE | db.DB_TRUNCATE |
| else: |
| raise error, "flags should be one of 'r', 'w', 'c' or 'n'" |
| return flags | db.DB_THREAD |
| |
| #---------------------------------------------------------------------- |
| |
| |
| # This is a silly little hack that allows apps to continue to use the |
| # DB_THREAD flag even on systems without threads without freaking out |
| # BerkeleyDB. |
| # |
| # This assumes that if Python was built with thread support then |
| # BerkeleyDB was too. |
| |
| try: |
| import thread |
| del thread |
| except ImportError: |
| db.DB_THREAD = 0 |
| |
| |
| #---------------------------------------------------------------------- |