[3260] | 1 | # -*- coding: UTF-8 -*- |
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[1021] | 2 | # |
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[3260] | 3 | # PyKota : Print Quotas for CUPS |
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[1021] | 4 | # |
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[3275] | 5 | # (c) 2003, 2004, 2005, 2006, 2007, 2008 Jerome Alet <alet@librelogiciel.com> |
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[3260] | 6 | # This program is free software: you can redistribute it and/or modify |
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[1021] | 7 | # it under the terms of the GNU General Public License as published by |
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[3260] | 8 | # the Free Software Foundation, either version 3 of the License, or |
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[1021] | 9 | # (at your option) any later version. |
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[3260] | 10 | # |
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[1021] | 11 | # This program is distributed in the hope that it will be useful, |
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| 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | # GNU General Public License for more details. |
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| 15 | # |
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| 16 | # You should have received a copy of the GNU General Public License |
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[3260] | 17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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[1021] | 18 | # |
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| 19 | # $Id$ |
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| 20 | # |
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[2033] | 21 | # |
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[1021] | 22 | |
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[3184] | 23 | """This module defines a class to access to a PostgreSQL database backend.""" |
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| 24 | |
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[2599] | 25 | from types import StringType |
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| 26 | |
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[3288] | 27 | from pykota.errors import PyKotaStorageError |
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| 28 | from pykota.storage import BaseStorage |
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[1327] | 29 | from pykota.storages.sql import SQLStorage |
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[1021] | 30 | |
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[3294] | 31 | from pykota.utils import * |
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| 32 | |
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[1021] | 33 | try : |
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| 34 | import pg |
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| 35 | except ImportError : |
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| 36 | import sys |
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| 37 | # TODO : to translate or not to translate ? |
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| 38 | raise PyKotaStorageError, "This python version (%s) doesn't seem to have the PygreSQL module installed correctly." % sys.version.split()[0] |
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[2031] | 39 | else : |
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| 40 | try : |
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| 41 | PGError = pg.Error |
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| 42 | except AttributeError : |
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| 43 | PGError = pg.error |
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[1021] | 44 | |
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[1327] | 45 | class Storage(BaseStorage, SQLStorage) : |
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[1021] | 46 | def __init__(self, pykotatool, host, dbname, user, passwd) : |
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| 47 | """Opens the PostgreSQL database connection.""" |
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[1130] | 48 | BaseStorage.__init__(self, pykotatool) |
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[1021] | 49 | try : |
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| 50 | (host, port) = host.split(":") |
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| 51 | port = int(port) |
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| 52 | except ValueError : |
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[2874] | 53 | port = 5432 # Use PostgreSQL's default tcp/ip port (5432). |
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[1021] | 54 | |
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[2418] | 55 | self.tool.logdebug("Trying to open database (host=%s, port=%s, dbname=%s, user=%s)..." % (host, port, dbname, user)) |
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[3182] | 56 | try : |
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| 57 | self.database = pg.connect(host=host, port=port, dbname=dbname, user=user, passwd=passwd) |
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| 58 | except PGError, msg : |
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| 59 | msg = "%(msg)s --- the most probable cause of your problem is that PostgreSQL is down, or doesn't accept incoming connections because you didn't configure it as explained in PyKota's documentation." % locals() |
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| 60 | raise PGError, msg |
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[2210] | 61 | self.closed = 0 |
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[2960] | 62 | try : |
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| 63 | self.database.query("SET CLIENT_ENCODING TO 'UTF-8';") |
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| 64 | except PGError, msg : |
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[2972] | 65 | self.tool.logdebug("Impossible to set database client encoding to UTF-8 : %s" % msg) |
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[2210] | 66 | self.tool.logdebug("Database opened (host=%s, port=%s, dbname=%s, user=%s)" % (host, port, dbname, user)) |
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[1021] | 67 | |
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[1113] | 68 | def close(self) : |
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[1021] | 69 | """Closes the database connection.""" |
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| 70 | if not self.closed : |
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| 71 | self.database.close() |
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| 72 | self.closed = 1 |
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[1130] | 73 | self.tool.logdebug("Database closed.") |
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[1021] | 74 | |
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[1041] | 75 | def beginTransaction(self) : |
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| 76 | """Starts a transaction.""" |
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| 77 | self.database.query("BEGIN;") |
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[1130] | 78 | self.tool.logdebug("Transaction begins...") |
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[1041] | 79 | |
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| 80 | def commitTransaction(self) : |
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| 81 | """Commits a transaction.""" |
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| 82 | self.database.query("COMMIT;") |
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[1130] | 83 | self.tool.logdebug("Transaction committed.") |
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[1041] | 84 | |
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| 85 | def rollbackTransaction(self) : |
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| 86 | """Rollbacks a transaction.""" |
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| 87 | self.database.query("ROLLBACK;") |
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[1130] | 88 | self.tool.logdebug("Transaction aborted.") |
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[1041] | 89 | |
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[1717] | 90 | def doRawSearch(self, query) : |
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| 91 | """Does a raw search query.""" |
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[1021] | 92 | query = query.strip() |
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| 93 | if not query.endswith(';') : |
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| 94 | query += ';' |
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| 95 | try : |
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[3294] | 96 | self.querydebug("QUERY : %s" % query) |
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[3308] | 97 | return self.database.query(query) |
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[2031] | 98 | except PGError, msg : |
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[3308] | 99 | raise PyKotaStorageError, repr(msg) |
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[1041] | 100 | |
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[1717] | 101 | def doSearch(self, query) : |
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| 102 | """Does a search query.""" |
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| 103 | result = self.doRawSearch(query) |
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| 104 | if (result is not None) and (result.ntuples() > 0) : |
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| 105 | return result.dictresult() |
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| 106 | |
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[1041] | 107 | def doModify(self, query) : |
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| 108 | """Does a (possibly multiple) modify query.""" |
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| 109 | query = query.strip() |
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| 110 | if not query.endswith(';') : |
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| 111 | query += ';' |
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| 112 | try : |
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[3294] | 113 | self.querydebug("QUERY : %s" % query) |
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[3308] | 114 | return self.database.query(query) |
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[2031] | 115 | except PGError, msg : |
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[2773] | 116 | self.tool.logdebug("Query failed : %s" % repr(msg)) |
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[3308] | 117 | raise PyKotaStorageError, repr(msg) |
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[1041] | 118 | |
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[1021] | 119 | def doQuote(self, field) : |
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| 120 | """Quotes a field for use as a string in SQL queries.""" |
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| 121 | if type(field) == type(0.0) : |
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| 122 | typ = "decimal" |
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| 123 | elif type(field) == type(0) : |
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| 124 | typ = "int" |
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[1520] | 125 | elif type(field) == type(0L) : |
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| 126 | typ = "int" |
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[1021] | 127 | else : |
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| 128 | typ = "text" |
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| 129 | return pg._quote(field, typ) |
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[2593] | 130 | |
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| 131 | def prepareRawResult(self, result) : |
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| 132 | """Prepares a raw result by including the headers.""" |
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| 133 | if result.ntuples() > 0 : |
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| 134 | entries = [result.listfields()] |
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| 135 | entries.extend(result.getresult()) |
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| 136 | nbfields = len(entries[0]) |
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| 137 | for i in range(1, len(entries)) : |
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| 138 | fields = list(entries[i]) |
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| 139 | for j in range(nbfields) : |
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| 140 | field = fields[j] |
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| 141 | if type(field) == StringType : |
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[3294] | 142 | fields[j] = databaseToUnicode(field) |
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[2593] | 143 | entries[i] = tuple(fields) |
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| 144 | return entries |
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| 145 | |
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