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GeezerVison is showing github.com — sqlobject/sqlobject/sqlite/sqliteconnection.py at master · sqlobject/sqlobject Expand file tree/ Copy pathsqliteconnection.pyMore file actions 418 lines (377 loc) · 15.2 KB / Copy pathsqliteconnection.pyFile metadata and controls418 lines (377 loc) · 15.2 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 import base64 import os try: from _thread import get_ident except ImportError: from thread import get_ident from threading import enumerate as enumerate_threads try: from urllib import quote except ImportError: from urllib.parse import quote from sqlobject import col from sqlobject import dberrors from sqlobject.dbconnection import DBAPI, Boolean sqlite2_Binary = None class ErrorMessage(str): def __new__(cls, e): obj = str.__new__(cls, e.args[0]) obj.code = None obj.module = e.__module__ obj.exception = e.__class__.__name__ return obj class SQLiteConnection(DBAPI): supportTransactions = True dbName = 'sqlite' schemes = [dbName] def __init__(self, filename, autoCommit=1, **kw): import sqlite3 as sqlite sqlite.encode = base64.b64encode sqlite.decode = base64.b64decode self.module = sqlite self.filename = filename # full path to sqlite-db-file self._memory = filename == ':memory:' # connection options opts = {} if autoCommit: opts["isolation_level"] = None global sqlite2_Binary if sqlite2_Binary is None: sqlite2_Binary = sqlite.Binary sqlite.Binary = lambda s: sqlite2_Binary(sqlite.encode(s)) if 'factory' in kw: factory = kw.pop('factory') if isinstance(factory, str): factory = globals()[factory] opts['factory'] = factory(sqlite) if 'timeout' in kw: opts['timeout'] = float(kw.pop('timeout')) if 'check_same_thread' in kw: opts["check_same_thread"] = Boolean(kw.pop('check_same_thread')) # use only one connection for sqlite - supports multiple) # cursors per connection self._connOptions = opts self.use_table_info = Boolean(kw.pop("use_table_info", True)) DBAPI.__init__(self, **kw) self._threadPool = {} self._threadOrigination = {} if self._memory: self.makeMemoryConnection() @classmethod def _connectionFromParams(cls, user, password, host, port, path, args): assert host is None and port is None, ( "SQLite can only be used locally (with a URI like " "sqlite:/file or sqlite:///file, not sqlite://%s%s)" % (host, port and ':%r' % port or '')) assert user is None and password is None, ( "You may not provide usernames or passwords for SQLite " "databases") if path == "/:memory:": path = ":memory:" return cls(filename=path, **args) def oldUri(self): path = self.filename if path == ":memory:": path = "/:memory:" else: path = "//" + path return 'sqlite:%s' % path def uri(self): path = self.filename if path == ":memory:": path = "/:memory:" else: if path.startswith('/'): path = "//" + path else: path = "///" + path path = quote(path) return 'sqlite:%s' % path def getConnection(self): # SQLite can't share connections between threads, and so can't # pool connections. Since we are isolating threads here, we # don't have to worry about locking as much. if self._memory: conn = self.makeConnection() self._connectionNumbers[id(conn)] = self._connectionCount self._connectionCount += 1 return conn self._releaseUnusedConnections() threadid = get_ident() if (self._pool is not None and threadid in self._threadPool): conn = self._threadPool[threadid] del self._threadPool[threadid] if conn in self._pool: self._pool.remove(conn) else: conn = self.makeConnection() if self._pool is not None: self._threadOrigination[id(conn)] = threadid self._connectionNumbers[id(conn)] = self._connectionCount self._connectionCount += 1 if self.debug: s = 'ACQUIRE' if self._pool is not None: s += ' pool=[%s]' % ', '.join( [str(self._connectionNumbers[id(v)]) for v in self._pool]) self.printDebug(conn, s, 'Pool') return conn def releaseConnection(self, conn, explicit=False): if self._memory: return threadid = self._threadOrigination.get(id(conn)) DBAPI.releaseConnection(self, conn, explicit=explicit) if (self._pool is not None and threadid and threadid not in self._threadPool): self._threadPool[threadid] = conn else: if self._pool and conn in self._pool: self._pool.remove(conn) if threadid: del self._threadOrigination[id(conn)] del self._threadPool[threadid] conn.close() def _setAutoCommit(self, conn, auto): if auto: conn.isolation_level = None else: conn.isolation_level = "" def _setIsolationLevel(self, conn, level): conn.isolation_level = level def makeMemoryConnection(self): self._memoryConn = self.module.connect( self.filename, **self._connOptions) # Convert text data from SQLite to str, not unicode - # SQLObject converts it to unicode itself. self._memoryConn.text_factory = str def makeConnection(self): if self._memory: return self._memoryConn conn = self.module.connect(self.filename, **self._connOptions) conn.text_factory = str # Convert text data to str, not unicode return conn def _releaseUnusedConnections(self): """Release connections from threads that're no longer active""" thread_ids = set(t.ident for t in enumerate_threads()) tp_set = set(self._threadPool) unused_connections = [ self._threadPool[tid] for tid in tp_set - thread_ids ] for unused_connection in unused_connections: try: self.releaseConnection(unused_connection, explicit=True) except self.module.ProgrammingError: pass # Ignore error in `conn.close()` from a different thread def close(self): DBAPI.close(self) self._threadPool = {} self._threadOrigination = {} if self._memory: self._memoryConn.close() self.makeMemoryConnection() def _executeRetry(self, conn, cursor, query): if self.debug: self.printDebug(conn, query, 'QueryR') try: return cursor.execute(query) except self.module.OperationalError as e: raise dberrors.OperationalError(ErrorMessage(e)) except self.module.IntegrityError as e: msg = ErrorMessage(e) if msg.startswith('column') and msg.endswith('not unique') \ or msg.startswith('UNIQUE constraint failed:'): raise dberrors.DuplicateEntryError(msg) else: raise dberrors.IntegrityError(msg) except self.module.InternalError as e: raise dberrors.InternalError(ErrorMessage(e)) except self.module.ProgrammingError as e: raise dberrors.ProgrammingError(ErrorMessage(e)) except self.module.DataError as e: raise dberrors.DataError(ErrorMessage(e)) except self.module.NotSupportedError as e: raise dberrors.NotSupportedError(ErrorMessage(e)) except self.module.DatabaseError as e: raise dberrors.DatabaseError(ErrorMessage(e)) except self.module.InterfaceError as e: raise dberrors.InterfaceError(ErrorMessage(e)) except self.module.Warning as e: raise Warning(ErrorMessage(e)) except self.module.Error as e: raise dberrors.Error(ErrorMessage(e)) def _queryInsertID(self, conn, soInstance, id, names, values): table = soInstance.sqlmeta.table idName = soInstance.sqlmeta.idName c = conn.cursor() if id is not None: names = [idName] + names values = [id] + values q = self._insertSQL(table, names, values) if self.debug: self.printDebug(conn, q, 'QueryIns') self._executeRetry(conn, c, q) # lastrowid is a DB-API extension from "PEP 0249": if id is None: id = int(c.lastrowid) c.close() if self.debugOutput: self.printDebug(conn, id, 'QueryIns', 'result') return id def _insertSQL(self, table, names, values): if not names: assert not values # INSERT INTO table () VALUES () isn't allowed in # SQLite (though it is in other databases) return ("INSERT INTO %s VALUES (NULL)" % table) else: return DBAPI._insertSQL(self, table, names, values) @classmethod def _queryAddLimitOffset(cls, query, start, end): if not start: return "%s LIMIT %i" % (query, end) if not end: return "%s LIMIT 0 OFFSET %i" % (query, start) return "%s LIMIT %i OFFSET %i" % (query, end - start, start) def createColumn(self, soClass, col): return col.sqliteCreateSQL() def createReferenceConstraint(self, soClass, col): return None def createIDColumn(self, soClass): return self._createIDColumn(soClass.sqlmeta) def _createIDColumn(self, sqlmeta): if sqlmeta.idType is str: return '%s TEXT PRIMARY KEY' % sqlmeta.idName if sqlmeta.idType is not int: raise TypeError('sqlmeta.idType must be int or str, not %r' % sqlmeta.idType) return '%s INTEGER PRIMARY KEY AUTOINCREMENT' % sqlmeta.idName def joinSQLType(self, join): return 'INT NOT NULL' def tableExists(self, tableName): result = self.queryOne( "SELECT tbl_name FROM sqlite_master " "WHERE type='table' AND tbl_name = '%s'" % tableName) # turn it into a boolean: return not not result def createIndexSQL(self, soClass, index): return index.sqliteCreateIndexSQL(soClass) def addColumn(self, tableName, column): self.query('ALTER TABLE %s ADD COLUMN %s' % (tableName, column.sqliteCreateSQL())) self.query('VACUUM') def delColumn(self, sqlmeta, column): self.recreateTableWithoutColumn(sqlmeta, column) def recreateTableWithoutColumn(self, sqlmeta, column): new_name = sqlmeta.table + '_ORIGINAL' self.query('ALTER TABLE %s RENAME TO %s' % (sqlmeta.table, new_name)) cols = [self._createIDColumn(sqlmeta)] + \ [self.createColumn(None, col) for col in sqlmeta.columnList if col.name != column.name] cols = ",\n".join([" %s" % c for c in cols]) self.query('CREATE TABLE %s (\n%s\n)' % (sqlmeta.table, cols)) all_columns = ', '.join( [sqlmeta.idName] + [col.dbName for col in sqlmeta.columnList]) self.query('INSERT INTO %s (%s) SELECT %s FROM %s' % ( sqlmeta.table, all_columns, all_columns, new_name)) self.query('DROP TABLE %s' % new_name) def columnsFromSchema(self, tableName, soClass): if self.use_table_info: return self._columnsFromSchemaTableInfo(tableName, soClass) else: return self._columnsFromSchemaParse(tableName, soClass) def _columnsFromSchemaTableInfo(self, tableName, soClass): colData = self.queryAll("PRAGMA table_info(%s)" % tableName) results = [] for index, field, t, nullAllowed, default, key in colData: if field == soClass.sqlmeta.idName: continue colClass, kw = self.guessClass(t) if default == 'NULL': nullAllowed = True default = None kw['name'] = soClass.sqlmeta.style.dbColumnToPythonAttr(field) kw['dbName'] = field kw['notNone'] = not nullAllowed kw['default'] = default # @@ skip key... # @@ skip extra... results.append(colClass(**kw)) return results def _columnsFromSchemaParse(self, tableName, soClass): colData = self.queryOne( "SELECT sql FROM sqlite_master WHERE type='table' AND name='%s'" % tableName) if not colData: raise ValueError( 'The table %s was not found in the database. Load failed.' % tableName) colData = colData[0].split('(', 1)[1].strip()[:-2] while True: start = colData.find('(') if start == -1: break end = colData.find(')', start) if end == -1: break colData = colData[:start] + colData[end + 1:] results = [] for colDesc in colData.split(','): parts = colDesc.strip().split(' ', 2) field = parts[0].strip() # skip comments if field.startswith('--'): continue # get rid of enclosing quotes if field[0] == field[-1] == '"': field = field[1:-1] if field == getattr(soClass.sqlmeta, 'idName', 'id'): continue colClass, kw = self.guessClass(parts[1].strip()) if len(parts) == 2: index_info = '' else: index_info = parts[2].strip().upper() kw['name'] = soClass.sqlmeta.style.dbColumnToPythonAttr(field) kw['dbName'] = field import re nullble = re.search(r'(\b\S*)\sNULL', index_info) default = re.search( r"DEFAULT\s((?:\d[\dA-FX.]*)|(?:'[^']*')|(?:#[^#]*#))", index_info) kw['notNone'] = nullble and nullble.group(1) == 'NOT' kw['default'] = default and default.group(1) # @@ skip key... # @@ skip extra... results.append(colClass(**kw)) return results def guessClass(self, t): t = t.upper() if t.find('INT') >= 0: return col.IntCol, {} elif t.find('TEXT') >= 0 or t.find('CHAR') >= 0 or t.find('CLOB') >= 0: return col.StringCol, {'length': 2 ** 32 - 1} elif t.find('BLOB') >= 0: return col.BLOBCol, {"length": 2 ** 32 - 1} elif t.find('REAL') >= 0 or t.find('FLOAT') >= 0: return col.FloatCol, {} elif t.find('DECIMAL') >= 0: return col.DecimalCol, {'size': None, 'precision': None} elif t.find('BOOL') >= 0: return col.BoolCol, {} else: return col.Col, {} def listTables(self): return [v[0] for v in self.queryAll( "SELECT name FROM sqlite_master WHERE type='table' ORDER BY name")] def listDatabases(self): # The pragma returns a list of (index, name, filename) return [v[1] for v in self.queryAll("PRAGMA database_list")] def createEmptyDatabase(self): if self._memory: return open(self.filename, 'w').close() def dropDatabase(self): if self._memory: return os.unlink(self.filename) |
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