| #----------------------------------------------------------------------- |
| # |
| # Copyright (C) 2000, 2001 by Autonomous Zone Industries |
| # Copyright (C) 2002 Gregory P. Smith |
| # |
| # License: This is free software. You may use this software for any |
| # purpose including modification/redistribution, so long as |
| # this header remains intact and that you do not claim any |
| # rights of ownership or authorship of this software. This |
| # software has been tested, but no warranty is expressed or |
| # implied. |
| # |
| # -- Gregory P. Smith <greg@krypto.org> |
| |
| # This provides a simple database table interface built on top of |
| # the Python Berkeley DB 3 interface. |
| # |
| _cvsid = '$Id$' |
| |
| import re |
| import sys |
| import copy |
| import random |
| import struct |
| |
| |
| if sys.version_info[0] >= 3 : |
| import pickle |
| else : |
| if sys.version_info < (2, 6) : |
| import cPickle as pickle |
| else : |
| # When we drop support for python 2.4 |
| # we could use: (in 2.5 we need a __future__ statement) |
| # |
| # with warnings.catch_warnings(): |
| # warnings.filterwarnings(...) |
| # ... |
| # |
| # We can not use "with" as is, because it would be invalid syntax |
| # in python 2.4 and (with no __future__) 2.5. |
| # Here we simulate "with" following PEP 343 : |
| import warnings |
| w = warnings.catch_warnings() |
| w.__enter__() |
| try : |
| warnings.filterwarnings('ignore', |
| message='the cPickle module has been removed in Python 3.0', |
| category=DeprecationWarning) |
| import cPickle as pickle |
| finally : |
| w.__exit__() |
| del w |
| |
| try: |
| # For Pythons w/distutils pybsddb |
| from bsddb3 import db |
| except ImportError: |
| # For Python 2.3 |
| from bsddb import db |
| |
| class TableDBError(StandardError): |
| pass |
| class TableAlreadyExists(TableDBError): |
| pass |
| |
| |
| class Cond: |
| """This condition matches everything""" |
| def __call__(self, s): |
| return 1 |
| |
| class ExactCond(Cond): |
| """Acts as an exact match condition function""" |
| def __init__(self, strtomatch): |
| self.strtomatch = strtomatch |
| def __call__(self, s): |
| return s == self.strtomatch |
| |
| class PrefixCond(Cond): |
| """Acts as a condition function for matching a string prefix""" |
| def __init__(self, prefix): |
| self.prefix = prefix |
| def __call__(self, s): |
| return s[:len(self.prefix)] == self.prefix |
| |
| class PostfixCond(Cond): |
| """Acts as a condition function for matching a string postfix""" |
| def __init__(self, postfix): |
| self.postfix = postfix |
| def __call__(self, s): |
| return s[-len(self.postfix):] == self.postfix |
| |
| class LikeCond(Cond): |
| """ |
| Acts as a function that will match using an SQL 'LIKE' style |
| string. Case insensitive and % signs are wild cards. |
| This isn't perfect but it should work for the simple common cases. |
| """ |
| def __init__(self, likestr, re_flags=re.IGNORECASE): |
| # escape python re characters |
| chars_to_escape = '.*+()[]?' |
| for char in chars_to_escape : |
| likestr = likestr.replace(char, '\\'+char) |
| # convert %s to wildcards |
| self.likestr = likestr.replace('%', '.*') |
| self.re = re.compile('^'+self.likestr+'$', re_flags) |
| def __call__(self, s): |
| return self.re.match(s) |
| |
| # |
| # keys used to store database metadata |
| # |
| _table_names_key = '__TABLE_NAMES__' # list of the tables in this db |
| _columns = '._COLUMNS__' # table_name+this key contains a list of columns |
| |
| def _columns_key(table): |
| return table + _columns |
| |
| # |
| # these keys are found within table sub databases |
| # |
| _data = '._DATA_.' # this+column+this+rowid key contains table data |
| _rowid = '._ROWID_.' # this+rowid+this key contains a unique entry for each |
| # row in the table. (no data is stored) |
| _rowid_str_len = 8 # length in bytes of the unique rowid strings |
| |
| |
| def _data_key(table, col, rowid): |
| return table + _data + col + _data + rowid |
| |
| def _search_col_data_key(table, col): |
| return table + _data + col + _data |
| |
| def _search_all_data_key(table): |
| return table + _data |
| |
| def _rowid_key(table, rowid): |
| return table + _rowid + rowid + _rowid |
| |
| def _search_rowid_key(table): |
| return table + _rowid |
| |
| def contains_metastrings(s) : |
| """Verify that the given string does not contain any |
| metadata strings that might interfere with dbtables database operation. |
| """ |
| if (s.find(_table_names_key) >= 0 or |
| s.find(_columns) >= 0 or |
| s.find(_data) >= 0 or |
| s.find(_rowid) >= 0): |
| # Then |
| return 1 |
| else: |
| return 0 |
| |
| |
| class bsdTableDB : |
| def __init__(self, filename, dbhome, create=0, truncate=0, mode=0600, |
| recover=0, dbflags=0): |
| """bsdTableDB(filename, dbhome, create=0, truncate=0, mode=0600) |
| |
| Open database name in the dbhome Berkeley DB directory. |
| Use keyword arguments when calling this constructor. |
| """ |
| self.db = None |
| myflags = db.DB_THREAD |
| if create: |
| myflags |= db.DB_CREATE |
| flagsforenv = (db.DB_INIT_MPOOL | db.DB_INIT_LOCK | db.DB_INIT_LOG | |
| db.DB_INIT_TXN | dbflags) |
| # DB_AUTO_COMMIT isn't a valid flag for env.open() |
| try: |
| dbflags |= db.DB_AUTO_COMMIT |
| except AttributeError: |
| pass |
| if recover: |
| flagsforenv = flagsforenv | db.DB_RECOVER |
| self.env = db.DBEnv() |
| # enable auto deadlock avoidance |
| self.env.set_lk_detect(db.DB_LOCK_DEFAULT) |
| self.env.open(dbhome, myflags | flagsforenv) |
| if truncate: |
| myflags |= db.DB_TRUNCATE |
| self.db = db.DB(self.env) |
| # this code relies on DBCursor.set* methods to raise exceptions |
| # rather than returning None |
| self.db.set_get_returns_none(1) |
| # allow duplicate entries [warning: be careful w/ metadata] |
| self.db.set_flags(db.DB_DUP) |
| self.db.open(filename, db.DB_BTREE, dbflags | myflags, mode) |
| self.dbfilename = filename |
| |
| if sys.version_info[0] >= 3 : |
| class cursor_py3k(object) : |
| def __init__(self, dbcursor) : |
| self._dbcursor = dbcursor |
| |
| def close(self) : |
| return self._dbcursor.close() |
| |
| def set_range(self, search) : |
| v = self._dbcursor.set_range(bytes(search, "iso8859-1")) |
| if v is not None : |
| v = (v[0].decode("iso8859-1"), |
| v[1].decode("iso8859-1")) |
| return v |
| |
| def __next__(self) : |
| v = getattr(self._dbcursor, "next")() |
| if v is not None : |
| v = (v[0].decode("iso8859-1"), |
| v[1].decode("iso8859-1")) |
| return v |
| |
| class db_py3k(object) : |
| def __init__(self, db) : |
| self._db = db |
| |
| def cursor(self, txn=None) : |
| return cursor_py3k(self._db.cursor(txn=txn)) |
| |
| def has_key(self, key, txn=None) : |
| return getattr(self._db,"has_key")(bytes(key, "iso8859-1"), |
| txn=txn) |
| |
| def put(self, key, value, flags=0, txn=None) : |
| key = bytes(key, "iso8859-1") |
| if value is not None : |
| value = bytes(value, "iso8859-1") |
| return self._db.put(key, value, flags=flags, txn=txn) |
| |
| def put_bytes(self, key, value, txn=None) : |
| key = bytes(key, "iso8859-1") |
| return self._db.put(key, value, txn=txn) |
| |
| def get(self, key, txn=None, flags=0) : |
| key = bytes(key, "iso8859-1") |
| v = self._db.get(key, txn=txn, flags=flags) |
| if v is not None : |
| v = v.decode("iso8859-1") |
| return v |
| |
| def get_bytes(self, key, txn=None, flags=0) : |
| key = bytes(key, "iso8859-1") |
| return self._db.get(key, txn=txn, flags=flags) |
| |
| def delete(self, key, txn=None) : |
| key = bytes(key, "iso8859-1") |
| return self._db.delete(key, txn=txn) |
| |
| def close (self) : |
| return self._db.close() |
| |
| self.db = db_py3k(self.db) |
| else : # Python 2.x |
| pass |
| |
| # Initialize the table names list if this is a new database |
| txn = self.env.txn_begin() |
| try: |
| if not getattr(self.db, "has_key")(_table_names_key, txn): |
| getattr(self.db, "put_bytes", self.db.put) \ |
| (_table_names_key, pickle.dumps([], 1), txn=txn) |
| # Yes, bare except |
| except: |
| txn.abort() |
| raise |
| else: |
| txn.commit() |
| # TODO verify more of the database's metadata? |
| self.__tablecolumns = {} |
| |
| def __del__(self): |
| self.close() |
| |
| def close(self): |
| if self.db is not None: |
| self.db.close() |
| self.db = None |
| if self.env is not None: |
| self.env.close() |
| self.env = None |
| |
| def checkpoint(self, mins=0): |
| self.env.txn_checkpoint(mins) |
| |
| def sync(self): |
| self.db.sync() |
| |
| def _db_print(self) : |
| """Print the database to stdout for debugging""" |
| print "******** Printing raw database for debugging ********" |
| cur = self.db.cursor() |
| try: |
| key, data = cur.first() |
| while 1: |
| print repr({key: data}) |
| next = cur.next() |
| if next: |
| key, data = next |
| else: |
| cur.close() |
| return |
| except db.DBNotFoundError: |
| cur.close() |
| |
| |
| def CreateTable(self, table, columns): |
| """CreateTable(table, columns) - Create a new table in the database. |
| |
| raises TableDBError if it already exists or for other DB errors. |
| """ |
| assert isinstance(columns, list) |
| |
| txn = None |
| try: |
| # checking sanity of the table and column names here on |
| # table creation will prevent problems elsewhere. |
| if contains_metastrings(table): |
| raise ValueError( |
| "bad table name: contains reserved metastrings") |
| for column in columns : |
| if contains_metastrings(column): |
| raise ValueError( |
| "bad column name: contains reserved metastrings") |
| |
| columnlist_key = _columns_key(table) |
| if getattr(self.db, "has_key")(columnlist_key): |
| raise TableAlreadyExists, "table already exists" |
| |
| txn = self.env.txn_begin() |
| # store the table's column info |
| getattr(self.db, "put_bytes", self.db.put)(columnlist_key, |
| pickle.dumps(columns, 1), txn=txn) |
| |
| # add the table name to the tablelist |
| tablelist = pickle.loads(getattr(self.db, "get_bytes", |
| self.db.get) (_table_names_key, txn=txn, flags=db.DB_RMW)) |
| tablelist.append(table) |
| # delete 1st, in case we opened with DB_DUP |
| self.db.delete(_table_names_key, txn=txn) |
| getattr(self.db, "put_bytes", self.db.put)(_table_names_key, |
| pickle.dumps(tablelist, 1), txn=txn) |
| |
| txn.commit() |
| txn = None |
| except db.DBError, dberror: |
| if txn: |
| txn.abort() |
| if sys.version_info < (2, 6) : |
| raise TableDBError, dberror[1] |
| else : |
| raise TableDBError, dberror.args[1] |
| |
| |
| def ListTableColumns(self, table): |
| """Return a list of columns in the given table. |
| [] if the table doesn't exist. |
| """ |
| assert isinstance(table, str) |
| if contains_metastrings(table): |
| raise ValueError, "bad table name: contains reserved metastrings" |
| |
| columnlist_key = _columns_key(table) |
| if not getattr(self.db, "has_key")(columnlist_key): |
| return [] |
| pickledcolumnlist = getattr(self.db, "get_bytes", |
| self.db.get)(columnlist_key) |
| if pickledcolumnlist: |
| return pickle.loads(pickledcolumnlist) |
| else: |
| return [] |
| |
| def ListTables(self): |
| """Return a list of tables in this database.""" |
| pickledtablelist = self.db.get_get(_table_names_key) |
| if pickledtablelist: |
| return pickle.loads(pickledtablelist) |
| else: |
| return [] |
| |
| def CreateOrExtendTable(self, table, columns): |
| """CreateOrExtendTable(table, columns) |
| |
| Create a new table in the database. |
| |
| If a table of this name already exists, extend it to have any |
| additional columns present in the given list as well as |
| all of its current columns. |
| """ |
| assert isinstance(columns, list) |
| |
| try: |
| self.CreateTable(table, columns) |
| except TableAlreadyExists: |
| # the table already existed, add any new columns |
| txn = None |
| try: |
| columnlist_key = _columns_key(table) |
| txn = self.env.txn_begin() |
| |
| # load the current column list |
| oldcolumnlist = pickle.loads( |
| getattr(self.db, "get_bytes", |
| self.db.get)(columnlist_key, txn=txn, flags=db.DB_RMW)) |
| # create a hash table for fast lookups of column names in the |
| # loop below |
| oldcolumnhash = {} |
| for c in oldcolumnlist: |
| oldcolumnhash[c] = c |
| |
| # create a new column list containing both the old and new |
| # column names |
| newcolumnlist = copy.copy(oldcolumnlist) |
| for c in columns: |
| if not c in oldcolumnhash: |
| newcolumnlist.append(c) |
| |
| # store the table's new extended column list |
| if newcolumnlist != oldcolumnlist : |
| # delete the old one first since we opened with DB_DUP |
| self.db.delete(columnlist_key, txn=txn) |
| getattr(self.db, "put_bytes", self.db.put)(columnlist_key, |
| pickle.dumps(newcolumnlist, 1), |
| txn=txn) |
| |
| txn.commit() |
| txn = None |
| |
| self.__load_column_info(table) |
| except db.DBError, dberror: |
| if txn: |
| txn.abort() |
| if sys.version_info < (2, 6) : |
| raise TableDBError, dberror[1] |
| else : |
| raise TableDBError, dberror.args[1] |
| |
| |
| def __load_column_info(self, table) : |
| """initialize the self.__tablecolumns dict""" |
| # check the column names |
| try: |
| tcolpickles = getattr(self.db, "get_bytes", |
| self.db.get)(_columns_key(table)) |
| except db.DBNotFoundError: |
| raise TableDBError, "unknown table: %r" % (table,) |
| if not tcolpickles: |
| raise TableDBError, "unknown table: %r" % (table,) |
| self.__tablecolumns[table] = pickle.loads(tcolpickles) |
| |
| def __new_rowid(self, table, txn) : |
| """Create a new unique row identifier""" |
| unique = 0 |
| while not unique: |
| # Generate a random 64-bit row ID string |
| # (note: might have <64 bits of true randomness |
| # but it's plenty for our database id needs!) |
| blist = [] |
| for x in xrange(_rowid_str_len): |
| blist.append(random.randint(0,255)) |
| newid = struct.pack('B'*_rowid_str_len, *blist) |
| |
| if sys.version_info[0] >= 3 : |
| newid = newid.decode("iso8859-1") # 8 bits |
| |
| # Guarantee uniqueness by adding this key to the database |
| try: |
| self.db.put(_rowid_key(table, newid), None, txn=txn, |
| flags=db.DB_NOOVERWRITE) |
| except db.DBKeyExistError: |
| pass |
| else: |
| unique = 1 |
| |
| return newid |
| |
| |
| def Insert(self, table, rowdict) : |
| """Insert(table, datadict) - Insert a new row into the table |
| using the keys+values from rowdict as the column values. |
| """ |
| |
| txn = None |
| try: |
| if not getattr(self.db, "has_key")(_columns_key(table)): |
| raise TableDBError, "unknown table" |
| |
| # check the validity of each column name |
| if not table in self.__tablecolumns: |
| self.__load_column_info(table) |
| for column in rowdict.keys() : |
| if not self.__tablecolumns[table].count(column): |
| raise TableDBError, "unknown column: %r" % (column,) |
| |
| # get a unique row identifier for this row |
| txn = self.env.txn_begin() |
| rowid = self.__new_rowid(table, txn=txn) |
| |
| # insert the row values into the table database |
| for column, dataitem in rowdict.items(): |
| # store the value |
| self.db.put(_data_key(table, column, rowid), dataitem, txn=txn) |
| |
| txn.commit() |
| txn = None |
| |
| except db.DBError, dberror: |
| # WIBNI we could just abort the txn and re-raise the exception? |
| # But no, because TableDBError is not related to DBError via |
| # inheritance, so it would be backwards incompatible. Do the next |
| # best thing. |
| info = sys.exc_info() |
| if txn: |
| txn.abort() |
| self.db.delete(_rowid_key(table, rowid)) |
| if sys.version_info < (2, 6) : |
| raise TableDBError, dberror[1], info[2] |
| else : |
| raise TableDBError, dberror.args[1], info[2] |
| |
| |
| def Modify(self, table, conditions={}, mappings={}): |
| """Modify(table, conditions={}, mappings={}) - Modify items in rows matching 'conditions' using mapping functions in 'mappings' |
| |
| * table - the table name |
| * conditions - a dictionary keyed on column names containing |
| a condition callable expecting the data string as an |
| argument and returning a boolean. |
| * mappings - a dictionary keyed on column names containing a |
| condition callable expecting the data string as an argument and |
| returning the new string for that column. |
| """ |
| |
| try: |
| matching_rowids = self.__Select(table, [], conditions) |
| |
| # modify only requested columns |
| columns = mappings.keys() |
| for rowid in matching_rowids.keys(): |
| txn = None |
| try: |
| for column in columns: |
| txn = self.env.txn_begin() |
| # modify the requested column |
| try: |
| dataitem = self.db.get( |
| _data_key(table, column, rowid), |
| txn=txn) |
| self.db.delete( |
| _data_key(table, column, rowid), |
| txn=txn) |
| except db.DBNotFoundError: |
| # XXXXXXX row key somehow didn't exist, assume no |
| # error |
| dataitem = None |
| dataitem = mappings[column](dataitem) |
| if dataitem is not None: |
| self.db.put( |
| _data_key(table, column, rowid), |
| dataitem, txn=txn) |
| txn.commit() |
| txn = None |
| |
| # catch all exceptions here since we call unknown callables |
| except: |
| if txn: |
| txn.abort() |
| raise |
| |
| except db.DBError, dberror: |
| if sys.version_info < (2, 6) : |
| raise TableDBError, dberror[1] |
| else : |
| raise TableDBError, dberror.args[1] |
| |
| def Delete(self, table, conditions={}): |
| """Delete(table, conditions) - Delete items matching the given |
| conditions from the table. |
| |
| * conditions - a dictionary keyed on column names containing |
| condition functions expecting the data string as an |
| argument and returning a boolean. |
| """ |
| |
| try: |
| matching_rowids = self.__Select(table, [], conditions) |
| |
| # delete row data from all columns |
| columns = self.__tablecolumns[table] |
| for rowid in matching_rowids.keys(): |
| txn = None |
| try: |
| txn = self.env.txn_begin() |
| for column in columns: |
| # delete the data key |
| try: |
| self.db.delete(_data_key(table, column, rowid), |
| txn=txn) |
| except db.DBNotFoundError: |
| # XXXXXXX column may not exist, assume no error |
| pass |
| |
| try: |
| self.db.delete(_rowid_key(table, rowid), txn=txn) |
| except db.DBNotFoundError: |
| # XXXXXXX row key somehow didn't exist, assume no error |
| pass |
| txn.commit() |
| txn = None |
| except db.DBError, dberror: |
| if txn: |
| txn.abort() |
| raise |
| except db.DBError, dberror: |
| if sys.version_info < (2, 6) : |
| raise TableDBError, dberror[1] |
| else : |
| raise TableDBError, dberror.args[1] |
| |
| |
| def Select(self, table, columns, conditions={}): |
| """Select(table, columns, conditions) - retrieve specific row data |
| Returns a list of row column->value mapping dictionaries. |
| |
| * columns - a list of which column data to return. If |
| columns is None, all columns will be returned. |
| * conditions - a dictionary keyed on column names |
| containing callable conditions expecting the data string as an |
| argument and returning a boolean. |
| """ |
| try: |
| if not table in self.__tablecolumns: |
| self.__load_column_info(table) |
| if columns is None: |
| columns = self.__tablecolumns[table] |
| matching_rowids = self.__Select(table, columns, conditions) |
| except db.DBError, dberror: |
| if sys.version_info < (2, 6) : |
| raise TableDBError, dberror[1] |
| else : |
| raise TableDBError, dberror.args[1] |
| # return the matches as a list of dictionaries |
| return matching_rowids.values() |
| |
| |
| def __Select(self, table, columns, conditions): |
| """__Select() - Used to implement Select and Delete (above) |
| Returns a dictionary keyed on rowids containing dicts |
| holding the row data for columns listed in the columns param |
| that match the given conditions. |
| * conditions is a dictionary keyed on column names |
| containing callable conditions expecting the data string as an |
| argument and returning a boolean. |
| """ |
| # check the validity of each column name |
| if not table in self.__tablecolumns: |
| self.__load_column_info(table) |
| if columns is None: |
| columns = self.tablecolumns[table] |
| for column in (columns + conditions.keys()): |
| if not self.__tablecolumns[table].count(column): |
| raise TableDBError, "unknown column: %r" % (column,) |
| |
| # keyed on rows that match so far, containings dicts keyed on |
| # column names containing the data for that row and column. |
| matching_rowids = {} |
| # keys are rowids that do not match |
| rejected_rowids = {} |
| |
| # attempt to sort the conditions in such a way as to minimize full |
| # column lookups |
| def cmp_conditions(atuple, btuple): |
| a = atuple[1] |
| b = btuple[1] |
| if type(a) is type(b): |
| |
| # Needed for python 3. "cmp" vanished in 3.0.1 |
| def cmp(a, b) : |
| if a==b : return 0 |
| if a<b : return -1 |
| return 1 |
| |
| if isinstance(a, PrefixCond) and isinstance(b, PrefixCond): |
| # longest prefix first |
| return cmp(len(b.prefix), len(a.prefix)) |
| if isinstance(a, LikeCond) and isinstance(b, LikeCond): |
| # longest likestr first |
| return cmp(len(b.likestr), len(a.likestr)) |
| return 0 |
| if isinstance(a, ExactCond): |
| return -1 |
| if isinstance(b, ExactCond): |
| return 1 |
| if isinstance(a, PrefixCond): |
| return -1 |
| if isinstance(b, PrefixCond): |
| return 1 |
| # leave all unknown condition callables alone as equals |
| return 0 |
| |
| if sys.version_info < (2, 6) : |
| conditionlist = conditions.items() |
| conditionlist.sort(cmp_conditions) |
| else : # Insertion Sort. Please, improve |
| conditionlist = [] |
| for i in conditions.items() : |
| for j, k in enumerate(conditionlist) : |
| r = cmp_conditions(k, i) |
| if r == 1 : |
| conditionlist.insert(j, i) |
| break |
| else : |
| conditionlist.append(i) |
| |
| # Apply conditions to column data to find what we want |
| cur = self.db.cursor() |
| column_num = -1 |
| for column, condition in conditionlist: |
| column_num = column_num + 1 |
| searchkey = _search_col_data_key(table, column) |
| # speedup: don't linear search columns within loop |
| if column in columns: |
| savethiscolumndata = 1 # save the data for return |
| else: |
| savethiscolumndata = 0 # data only used for selection |
| |
| try: |
| key, data = cur.set_range(searchkey) |
| while key[:len(searchkey)] == searchkey: |
| # extract the rowid from the key |
| rowid = key[-_rowid_str_len:] |
| |
| if not rowid in rejected_rowids: |
| # if no condition was specified or the condition |
| # succeeds, add row to our match list. |
| if not condition or condition(data): |
| if not rowid in matching_rowids: |
| matching_rowids[rowid] = {} |
| if savethiscolumndata: |
| matching_rowids[rowid][column] = data |
| else: |
| if rowid in matching_rowids: |
| del matching_rowids[rowid] |
| rejected_rowids[rowid] = rowid |
| |
| key, data = cur.next() |
| |
| except db.DBError, dberror: |
| if dberror.args[0] != db.DB_NOTFOUND: |
| raise |
| continue |
| |
| cur.close() |
| |
| # we're done selecting rows, garbage collect the reject list |
| del rejected_rowids |
| |
| # extract any remaining desired column data from the |
| # database for the matching rows. |
| if len(columns) > 0: |
| for rowid, rowdata in matching_rowids.items(): |
| for column in columns: |
| if column in rowdata: |
| continue |
| try: |
| rowdata[column] = self.db.get( |
| _data_key(table, column, rowid)) |
| except db.DBError, dberror: |
| if sys.version_info < (2, 6) : |
| if dberror[0] != db.DB_NOTFOUND: |
| raise |
| else : |
| if dberror.args[0] != db.DB_NOTFOUND: |
| raise |
| rowdata[column] = None |
| |
| # return the matches |
| return matching_rowids |
| |
| |
| def Drop(self, table): |
| """Remove an entire table from the database""" |
| txn = None |
| try: |
| txn = self.env.txn_begin() |
| |
| # delete the column list |
| self.db.delete(_columns_key(table), txn=txn) |
| |
| cur = self.db.cursor(txn) |
| |
| # delete all keys containing this tables column and row info |
| table_key = _search_all_data_key(table) |
| while 1: |
| try: |
| key, data = cur.set_range(table_key) |
| except db.DBNotFoundError: |
| break |
| # only delete items in this table |
| if key[:len(table_key)] != table_key: |
| break |
| cur.delete() |
| |
| # delete all rowids used by this table |
| table_key = _search_rowid_key(table) |
| while 1: |
| try: |
| key, data = cur.set_range(table_key) |
| except db.DBNotFoundError: |
| break |
| # only delete items in this table |
| if key[:len(table_key)] != table_key: |
| break |
| cur.delete() |
| |
| cur.close() |
| |
| # delete the tablename from the table name list |
| tablelist = pickle.loads( |
| getattr(self.db, "get_bytes", self.db.get)(_table_names_key, |
| txn=txn, flags=db.DB_RMW)) |
| try: |
| tablelist.remove(table) |
| except ValueError: |
| # hmm, it wasn't there, oh well, that's what we want. |
| pass |
| # delete 1st, incase we opened with DB_DUP |
| self.db.delete(_table_names_key, txn=txn) |
| getattr(self.db, "put_bytes", self.db.put)(_table_names_key, |
| pickle.dumps(tablelist, 1), txn=txn) |
| |
| txn.commit() |
| txn = None |
| |
| if table in self.__tablecolumns: |
| del self.__tablecolumns[table] |
| |
| except db.DBError, dberror: |
| if txn: |
| txn.abort() |
| raise TableDBError(dberror.args[1]) |
