[3489] | 1 | # -*- coding: utf-8 -*- |
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[3275] | 2 | # |
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| 3 | # PyKota : Print Quotas for CUPS |
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| 4 | # |
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[3481] | 5 | # (c) 2003-2009 Jerome Alet <alet@librelogiciel.com> |
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[3275] | 6 | # This program is free software: you can redistribute it and/or modify |
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| 7 | # it under the terms of the GNU General Public License as published by |
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| 8 | # the Free Software Foundation, either version 3 of the License, or |
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| 9 | # (at your option) any later version. |
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[3413] | 10 | # |
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[3275] | 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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[3413] | 15 | # |
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[3275] | 16 | # You should have received a copy of the GNU General Public License |
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| 17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 18 | # |
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[2591] | 19 | # $Id$ |
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| 20 | # |
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| 21 | # |
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| 22 | |
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[3184] | 23 | """This module defines a class to access to a SQLite database backend.""" |
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| 24 | |
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[3288] | 25 | from pykota.errors import PyKotaStorageError |
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| 26 | from pykota.storage import BaseStorage |
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[2591] | 27 | from pykota.storages.sql import SQLStorage |
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| 28 | |
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| 29 | try : |
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| 30 | from pysqlite2 import dbapi2 as sqlite |
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[3413] | 31 | except ImportError : |
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[2591] | 32 | import sys |
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| 33 | # TODO : to translate or not to translate ? |
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| 34 | raise PyKotaStorageError, "This python version (%s) doesn't seem to have the PySQLite module installed correctly." % sys.version.split()[0] |
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[3413] | 35 | |
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[2591] | 36 | class Storage(BaseStorage, SQLStorage) : |
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| 37 | def __init__(self, pykotatool, host, dbname, user, passwd) : |
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| 38 | """Opens the SQLite database connection.""" |
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| 39 | BaseStorage.__init__(self, pykotatool) |
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[3413] | 40 | |
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[3419] | 41 | self.tool.logdebug("Trying to open database (dbname=%s)..." % repr(dbname)) |
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[2591] | 42 | self.database = sqlite.connect(dbname, isolation_level=None) |
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| 43 | self.cursor = self.database.cursor() |
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[3419] | 44 | self.closed = False |
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| 45 | self.tool.logdebug("Database opened (dbname=%s)" % repr(dbname)) |
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[3413] | 46 | |
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| 47 | def close(self) : |
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[2591] | 48 | """Closes the database connection.""" |
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| 49 | if not self.closed : |
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| 50 | self.cursor.close() |
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| 51 | self.database.close() |
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[3419] | 52 | self.closed = True |
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[2591] | 53 | self.tool.logdebug("Database closed.") |
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[3413] | 54 | |
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| 55 | def beginTransaction(self) : |
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[2591] | 56 | """Starts a transaction.""" |
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| 57 | self.cursor.execute("BEGIN;") |
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| 58 | self.tool.logdebug("Transaction begins...") |
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[3413] | 59 | |
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| 60 | def commitTransaction(self) : |
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[2591] | 61 | """Commits a transaction.""" |
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| 62 | self.cursor.execute("COMMIT;") |
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| 63 | self.tool.logdebug("Transaction committed.") |
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[3413] | 64 | |
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| 65 | def rollbackTransaction(self) : |
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[2591] | 66 | """Rollbacks a transaction.""" |
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| 67 | self.cursor.execute("ROLLBACK;") |
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| 68 | self.tool.logdebug("Transaction aborted.") |
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[3413] | 69 | |
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[2591] | 70 | def doRawSearch(self, query) : |
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| 71 | """Does a raw search query.""" |
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[3413] | 72 | query = query.strip() |
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| 73 | if not query.endswith(';') : |
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[2591] | 74 | query += ';' |
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[3527] | 75 | self.querydebug("QUERY : %s" % query) |
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[2591] | 76 | try : |
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| 77 | self.cursor.execute(query) |
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[3413] | 78 | except self.database.Error, msg : |
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[3308] | 79 | raise PyKotaStorageError, repr(msg) |
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[3413] | 80 | else : |
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[2741] | 81 | result = self.cursor.fetchall() |
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| 82 | return result |
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[3413] | 83 | |
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| 84 | def doSearch(self, query) : |
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[2591] | 85 | """Does a search query.""" |
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| 86 | result = self.doRawSearch(query) |
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[3413] | 87 | if result : |
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[2591] | 88 | rows = [] |
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| 89 | fields = {} |
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| 90 | for i in range(len(self.cursor.description)) : |
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| 91 | fields[i] = self.cursor.description[i][0] |
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[3413] | 92 | for row in result : |
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[2591] | 93 | rowdict = {} |
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| 94 | for field in fields.keys() : |
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| 95 | value = row[field] |
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| 96 | try : |
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| 97 | value = value.encode("UTF-8") |
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| 98 | except : |
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| 99 | pass |
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| 100 | rowdict[fields[field]] = value |
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[3413] | 101 | rows.append(rowdict) |
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| 102 | return rows |
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| 103 | |
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[2591] | 104 | def doModify(self, query) : |
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| 105 | """Does a (possibly multiple) modify query.""" |
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[3413] | 106 | query = query.strip() |
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| 107 | if not query.endswith(';') : |
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[2591] | 108 | query += ';' |
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[3527] | 109 | self.querydebug("QUERY : %s" % query) |
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[2591] | 110 | try : |
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| 111 | self.cursor.execute(query) |
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[3413] | 112 | except self.database.Error, msg : |
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[2773] | 113 | self.tool.logdebug("Query failed : %s" % repr(msg)) |
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[3308] | 114 | raise PyKotaStorageError, repr(msg) |
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[3413] | 115 | |
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[2591] | 116 | def doQuote(self, field) : |
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| 117 | """Quotes a field for use as a string in SQL queries.""" |
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[3413] | 118 | if type(field) == type(0.0) : |
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[2591] | 119 | return field |
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[3413] | 120 | elif type(field) == type(0) : |
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[2591] | 121 | return field |
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[3413] | 122 | elif type(field) == type(0L) : |
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[2591] | 123 | return field |
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| 124 | elif field is not None : |
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[3528] | 125 | return ("'%s'" % field.replace("'", "''")) |
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[3413] | 126 | else : |
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[2591] | 127 | return "NULL" |
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[3413] | 128 | |
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[2593] | 129 | def prepareRawResult(self, result) : |
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| 130 | """Prepares a raw result by including the headers.""" |
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| 131 | if result : |
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| 132 | entries = [tuple([f[0] for f in self.cursor.description])] |
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[3413] | 133 | for entry in result : |
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[2593] | 134 | row = [] |
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| 135 | for value in entry : |
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| 136 | try : |
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| 137 | value = value.encode("UTF-8") |
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| 138 | except : |
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| 139 | pass |
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| 140 | row.append(value) |
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[3413] | 141 | entries.append(tuple(row)) |
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| 142 | return entries |
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