1 | # -*- coding: UTF-8 -*- |
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2 | # |
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3 | # PyKota : Print Quotas for CUPS |
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4 | # |
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5 | # (c) 2003, 2004, 2005, 2006, 2007, 2008 Jerome Alet <alet@librelogiciel.com> |
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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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10 | # |
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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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17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 | # |
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19 | # $Id$ |
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20 | # |
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21 | # |
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22 | |
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23 | """This module defines a class to access to a SQLite database backend.""" |
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24 | |
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25 | from pykota.errors import PyKotaStorageError |
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26 | from pykota.storage import BaseStorage |
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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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31 | except ImportError : |
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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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35 | |
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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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40 | |
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41 | self.tool.logdebug("Trying to open database (dbname=%s)..." % dbname) |
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42 | self.database = sqlite.connect(dbname, isolation_level=None) |
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43 | self.cursor = self.database.cursor() |
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44 | self.closed = 0 |
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45 | self.tool.logdebug("Database opened (dbname=%s)" % dbname) |
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46 | |
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47 | def close(self) : |
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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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52 | self.closed = 1 |
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53 | self.tool.logdebug("Database closed.") |
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54 | |
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55 | def beginTransaction(self) : |
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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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59 | |
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60 | def commitTransaction(self) : |
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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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64 | |
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65 | def rollbackTransaction(self) : |
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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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69 | |
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70 | def doRawSearch(self, query) : |
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71 | """Does a raw search query.""" |
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72 | query = query.strip() |
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73 | if not query.endswith(';') : |
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74 | query += ';' |
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75 | try : |
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76 | self.querydebug("QUERY : %s" % query) |
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77 | self.cursor.execute(query) |
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78 | except self.database.Error, msg : |
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79 | raise PyKotaStorageError, repr(msg) |
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80 | else : |
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81 | result = self.cursor.fetchall() |
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82 | return result |
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83 | |
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84 | def doSearch(self, query) : |
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85 | """Does a search query.""" |
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86 | result = self.doRawSearch(query) |
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87 | if result : |
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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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92 | for row in result : |
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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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101 | rows.append(rowdict) |
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102 | return rows |
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103 | |
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104 | def doModify(self, query) : |
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105 | """Does a (possibly multiple) modify query.""" |
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106 | query = query.strip() |
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107 | if not query.endswith(';') : |
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108 | query += ';' |
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109 | try : |
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110 | self.querydebug("QUERY : %s" % query) |
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111 | self.cursor.execute(query) |
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112 | except self.database.Error, msg : |
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113 | self.tool.logdebug("Query failed : %s" % repr(msg)) |
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114 | raise PyKotaStorageError, repr(msg) |
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115 | |
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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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118 | if type(field) == type(0.0) : |
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119 | return field |
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120 | elif type(field) == type(0) : |
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121 | return field |
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122 | elif type(field) == type(0L) : |
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123 | return field |
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124 | elif field is not None : |
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125 | return ("'%s'" % field.replace("'", "''")).decode("UTF-8") |
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126 | else : |
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127 | return "NULL" |
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128 | |
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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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133 | for entry in result : |
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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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141 | entries.append(tuple(row)) |
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142 | return entries |
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143 | |
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