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Specific # attributions are listed in the accompanying credits file. # ############################################################################## '''$Id: db.py 620 2005-01-13 10:49:24Z fog $''' __version__='$Revision: 1.31.2.7 $'[11:-2] from Shared.DC.ZRDB.TM import TM from Shared.DC.ZRDB import dbi_db import string, sys from string import strip, split, find from time import time from types import ListType import site import psycopg from psycopg import NUMBER, STRING, INTEGER, FLOAT, DATETIME from psycopg import BOOLEAN, ROWID, LONGINTEGER from ZODB.POSException import ConflictError class DB(TM,dbi_db.DB): _p_oid = _p_changed = _registered = None def __init__(self, connection, tilevel, enc='utf-8'): self.connection = connection self.tilevel = tilevel self.encoding = enc self.db = self.connect(self.connection) self.failures = 0 self.calls = 0 def connect(self, connection): o = psycopg.connect(connection) o.set_isolation_level(int(self.tilevel)) return o def _finish(self, *ignored): if hasattr(self, 'db') and self.db: self.db.commit() def _abort(self, *ignored): if hasattr(self, 'db') and self.db: self.db.rollback() def _cursor(self): """Obtains a cursor in a safe way.""" if not hasattr(self, 'db') or not self.db: self.db = self.connect(self.connection) return self.db.cursor() def tables(self, rdb=0, _care=('TABLE', 'VIEW')): self._register() c = self._cursor() c.execute('SELECT t.tablename AS NAME, ' '\'TABLE\' AS TYPE FROM pg_tables t ' 'WHERE tableowner <> \'postgres\' ' 'UNION SELECT v.viewname AS NAME, ' '\'VIEW\' AS TYPE FROM pg_views v ' 'WHERE viewowner <> \'postgres\' ' 'UNION SELECT t.tablename AS NAME, ' '\'SYSTEM_TABLE\' AS TYPE FROM pg_tables t ' 'WHERE tableowner = \'postgres\' ' 'UNION SELECT v.viewname AS NAME, ' '\'SYSTEM_TABLE\' AS TYPE FROM pg_views v ' 'WHERE viewowner = \'postgres\' ' ) r = [] a = r.append for name, typ in c.fetchall(): if typ in _care: a({'TABLE_NAME': name, 'TABLE_TYPE': typ}) c.close() return r def columns(self, table_name): self._register() c = self._cursor() try: r = c.execute('select * from "%s" where 1=0' % table_name) except: return () desc = c.description r = [] a = r.append for name, type, width, ds, p, scale, null_ok in desc: if type == NUMBER: if type == INTEGER: type = INTEGER elif type == FLOAT: type = FLOAT else: type = NUMBER elif type == BOOLEAN: type = BOOLEAN elif type == ROWID: type = ROWID elif type == DATETIME: type = DATETIME else: type = STRING a({ 'Name': name, 'Type': type.name, 'Precision': 0, 'Scale': 0, 'Nullable': 0}) return r def query(self, query_string, max_rows=None, query_data=None): self._register() self.calls = self.calls+1 desc = () result = [] nselects = 0 c = self._cursor() try: for qs in filter(None, map(strip, split(query_string, '\0'))): if type(qs) == unicode: if self.encoding: qs = qs.encode(self.encoding) try: if (query_data): r = c.execute(qs, query_data) else: r = c.execute(qs) except psycopg.OperationalError, perr: try: self.close() except: pass self.connect(self.connection) try: if (query_data): r = c.execute(qs, query_data) else: r = c.execute(qs) # this catch-2 of the same exception is horribe but # I can't see any other way of doing it right except (psycopg.ProgrammingError,psycopg.IntegrityError), \ perr: if perr.args[0].find("concurrent update") > -1: raise ConflictError raise perr except (psycopg.ProgrammingError,psycopg.IntegrityError), perr: if perr.args[0].find("concurrent update") > -1: raise ConflictError raise perr if c.description is not None: nselects = nselects + 1 if c.description != desc and nselects > 1: raise 'Query Error', \ 'Multiple select schema are not allowed' if max_rows: result = c.fetchmany(max_rows) else: result = c.fetchall() desc = c.description self.failures = 0 except StandardError, err: self._abort() raise err items = [] for name, typ, width, ds, p, scale, null_ok in desc: if typ == NUMBER: if typ == INTEGER or typ == LONGINTEGER: typs = 'i' else: typs = 'n' elif typ == BOOLEAN: typs = 'n' elif typ == ROWID: typs = 'i' elif typ == DATETIME: typs = 'd' else: typs = 's' items.append({ 'name': name, 'type': typs, 'width': width, 'null': null_ok, }) return items, result def close(self): """Close the connection.""" self.db.close() self.db = None def sortKey(self): """Zope 2.6 added this one.""" return 1