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annotate roundup/backends/back_postgresql.py @ 6604:0d99ae7c8de6

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Allow Roundup to use PostgreSQL database native full text search back_postgreql.py - schema version changes for schema version 7. configuration.py - added indexer_language checks for postgresql. Hardcoded list for now. Docs admin_guide and upgrading Tests. This also restructures the version upgrade tests for the rdbms backends. They can run all of them now as the proper cascade is developed to roll back changes to version 6.
author John Rouillard <rouilj@ieee.org>
date Thu, 27 Jan 2022 19:48:48 -0500
parents 39189dd94f2c
children db3f0ba75b4a
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1 # Copyright (c) 2003 Martynas Sklyzmantas, Andrey Lebedev <andrey@micro.lt>
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2 #
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 '''Postgresql backend via psycopg2 for Roundup.'''
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8 __docformat__ = 'restructuredtext'
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9
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10 import os, shutil, time
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11 ISOLATION_LEVEL_READ_UNCOMMITTED = None
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12 ISOLATION_LEVEL_READ_COMMITTED = None
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13 ISOLATION_LEVEL_REPEATABLE_READ = None
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14 ISOLATION_LEVEL_SERIALIZABLE = None
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15
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16 import psycopg2
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17 from psycopg2.extensions import QuotedString
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18 from psycopg2.extensions import ISOLATION_LEVEL_READ_UNCOMMITTED
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19 from psycopg2.extensions import ISOLATION_LEVEL_READ_COMMITTED
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20 from psycopg2.extensions import ISOLATION_LEVEL_REPEATABLE_READ
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21 from psycopg2.extensions import ISOLATION_LEVEL_SERIALIZABLE
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22 from psycopg2 import ProgrammingError
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23 from psycopg2.extensions import TransactionRollbackError
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24
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25 import logging
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26
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27 from roundup import hyperdb, date
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28 from roundup.backends import rdbms_common
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29 from roundup.backends import sessions_rdbms
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30
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31 isolation_levels = \
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32 { 'read uncommitted': ISOLATION_LEVEL_READ_COMMITTED
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33 , 'read committed': ISOLATION_LEVEL_READ_COMMITTED
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34 , 'repeatable read': ISOLATION_LEVEL_REPEATABLE_READ
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35 , 'serializable': ISOLATION_LEVEL_SERIALIZABLE
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36 }
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37
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38 def connection_dict(config, dbnamestr=None):
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39 ''' read_default_group is MySQL-specific, ignore it '''
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40 d = rdbms_common.connection_dict(config, dbnamestr)
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41 if 'read_default_group' in d:
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42 del d['read_default_group']
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43 if 'read_default_file' in d:
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44 del d['read_default_file']
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45 return d
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46
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47 def db_create(config):
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48 """Clear all database contents and drop database itself"""
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49 command = "CREATE DATABASE \"%s\" WITH ENCODING='UNICODE'"%config.RDBMS_NAME
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50 if config.RDBMS_TEMPLATE:
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51 command = command + " TEMPLATE=%s" % config.RDBMS_TEMPLATE
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52 logging.getLogger('roundup.hyperdb').info(command)
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53 db_command(config, command)
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54
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55 def db_nuke(config):
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56 """Clear all database contents and drop database itself"""
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57 command = 'DROP DATABASE "%s"'% config.RDBMS_NAME
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58 logging.getLogger('roundup.hyperdb').info(command)
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59 db_command(config, command)
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60
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61 if os.path.exists(config.DATABASE):
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62 shutil.rmtree(config.DATABASE)
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63
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64 def db_command(config, command, database='postgres'):
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65 '''Perform some sort of database-level command. Retry 10 times if we
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66 fail by conflicting with another user.
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67
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68 Since PostgreSQL version 8.1 there is a database "postgres",
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69 before "template1" seems to have been used, so we fall back to it.
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70 Compare to issue2550543.
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71 '''
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72 template1 = connection_dict(config)
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73 template1['database'] = database
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74
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75 try:
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76 conn = psycopg2.connect(**template1)
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77 except psycopg2.OperationalError as message:
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78 if str(message).find('database "postgres" does not exist') >= 0:
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79 return db_command(config, command, database='template1')
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80 raise hyperdb.DatabaseError(message)
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81
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82 conn.set_isolation_level(0)
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83 cursor = conn.cursor()
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84 try:
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85 for n in range(10):
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86 if pg_command(cursor, command):
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87 return
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88 finally:
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89 conn.close()
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90 raise RuntimeError('10 attempts to create database failed')
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91
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92 def pg_command(cursor, command):
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93 '''Execute the postgresql command, which may be blocked by some other
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94 user connecting to the database, and return a true value if it succeeds.
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95
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96 If there is a concurrent update, retry the command.
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97 '''
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98 try:
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99 cursor.execute(command)
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100 except psycopg2.DatabaseError as err:
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101 response = str(err).split('\n')[0]
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102 if "FATAL" not in response:
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103 msgs = (
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104 'is being accessed by other users',
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105 'could not serialize access due to concurrent update',
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106 )
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107 for msg in msgs:
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108 if msg in response:
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109 time.sleep(0.1)
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110 return 0
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111 raise RuntimeError (response)
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112 return 1
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113
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114 def db_exists(config):
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115 """Check if database already exists"""
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116 db = connection_dict(config, 'database')
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117 try:
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118 conn = psycopg2.connect(**db)
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119 conn.close()
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120 return 1
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121 except:
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122 return 0
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123
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124 class Sessions(sessions_rdbms.Sessions):
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125 def set(self, *args, **kwargs):
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Justus Pendleton <jpend@users.sourceforge.net>
parents: 3863
diff changeset
126 try:
3927
97ae174f7a0e add self to Sessions.set
Justus Pendleton <jpend@users.sourceforge.net>
parents: 3924
diff changeset
127 sessions_rdbms.Sessions.set(self, *args, **kwargs)
5248
198b6e810c67 Use Python-3-compatible 'as' syntax for except statements
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diff changeset
128 except ProgrammingError as err:
3918
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parents: 3863
diff changeset
129 response = str(err).split('\n')[0]
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Justus Pendleton <jpend@users.sourceforge.net>
parents: 3863
diff changeset
130 if -1 != response.find('ERROR') and \
c8899c4bf6ad safer session cleanup on postgres backends
Justus Pendleton <jpend@users.sourceforge.net>
parents: 3863
diff changeset
131 -1 != response.find('could not serialize access due to concurrent update'):
c8899c4bf6ad safer session cleanup on postgres backends
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parents: 3863
diff changeset
132 # another client just updated, and we're running on
c8899c4bf6ad safer session cleanup on postgres backends
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parents: 3863
diff changeset
133 # serializable isolation.
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parents: 3863
diff changeset
134 # see http://www.postgresql.org/docs/7.4/interactive/transaction-iso.html
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parents: 3863
diff changeset
135 self.db.rollback()
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parents: 3863
diff changeset
136
1911
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parents: 1906
diff changeset
137 class Database(rdbms_common.Database):
5096
e74c3611b138 - issue2550636, issue2550909: Added support for Whoosh indexer.
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parents: 4887
diff changeset
138 """Postgres DB backend implementation
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John Rouillard <rouilj@ieee.org>
parents: 4887
diff changeset
139
e74c3611b138 - issue2550636, issue2550909: Added support for Whoosh indexer.
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parents: 4887
diff changeset
140 attributes:
e74c3611b138 - issue2550636, issue2550909: Added support for Whoosh indexer.
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parents: 4887
diff changeset
141 dbtype:
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parents: 4887
diff changeset
142 holds the value for the type of db. It is used by indexer to
e74c3611b138 - issue2550636, issue2550909: Added support for Whoosh indexer.
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parents: 4887
diff changeset
143 identify the database type so it can import the correct indexer
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parents: 4887
diff changeset
144 module when using native text search mode.
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John Rouillard <rouilj@ieee.org>
parents: 4887
diff changeset
145 """
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parents: 4887
diff changeset
146
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diff changeset
147 arg = '%s'
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parents:
diff changeset
148
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parents: 4887
diff changeset
149 dbtype = "postgres"
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parents: 4887
diff changeset
150
3048
d9b4224f955c merge from maint-0-8
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parents: 2745
diff changeset
151 # used by some code to switch styles of query
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parents: 2745
diff changeset
152 implements_intersect = 1
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diff changeset
153
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f5c804379c85 fixed ZRoundup - mostly changes to classic template
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parents: 1906
diff changeset
154 def sql_open_connection(self):
3099
519b92df37dc handle ~/.my.cnf files for MySQL defaults [SF#1096031]
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parents: 3088
diff changeset
155 db = connection_dict(self.config, 'database')
4421
67bef70ab9b9 - more logger fixes, sorry for the noise.
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parents: 4420
diff changeset
156 logging.getLogger('roundup.hyperdb').info(
67bef70ab9b9 - more logger fixes, sorry for the noise.
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parents: 4420
diff changeset
157 'open database %r'%db['database'])
2082
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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parents: 2077
diff changeset
158 try:
5751
5cb6e6b594b0 issue2551040: New release of psycopg2 drops support for psycopg1
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parents: 5319
diff changeset
159 conn = psycopg2.connect(**db)
5cb6e6b594b0 issue2551040: New release of psycopg2 drops support for psycopg1
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parents: 5319
diff changeset
160 except psycopg2.OperationalError as message:
4357
13b3155869e0 Beginnings of a big code cleanup / modernisation to make 2to3 happy
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parents: 4239
diff changeset
161 raise hyperdb.DatabaseError(message)
2082
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parents: 2077
diff changeset
162
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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parents: 2077
diff changeset
163 cursor = conn.cursor()
4887
05c857e5dbed New rdbms configuration option 'isolation_level'
Ralf Schlatterbeck <rsc@runtux.com>
parents: 4787
diff changeset
164 if ISOLATION_LEVEL_REPEATABLE_READ is not None:
05c857e5dbed New rdbms configuration option 'isolation_level'
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parents: 4787
diff changeset
165 lvl = isolation_levels [self.config.RDBMS_ISOLATION_LEVEL]
05c857e5dbed New rdbms configuration option 'isolation_level'
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parents: 4787
diff changeset
166 conn.set_isolation_level(lvl)
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parents: 2077
diff changeset
167
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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parents: 2077
diff changeset
168 return (conn, cursor)
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diff changeset
169
6332
6a6b4651be1f Use server-side cursor for postgres in some cases
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parents: 5751
diff changeset
170 def sql_new_cursor(self, name='default', conn=None, *args, **kw):
6a6b4651be1f Use server-side cursor for postgres in some cases
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diff changeset
171 """ Create new cursor, this may need additional parameters for
6a6b4651be1f Use server-side cursor for postgres in some cases
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parents: 5751
diff changeset
172 performance optimization for different backends.
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parents: 5751
diff changeset
173 """
6a6b4651be1f Use server-side cursor for postgres in some cases
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parents: 5751
diff changeset
174 use_name = self.config.RDBMS_SERVERSIDE_CURSOR
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diff changeset
175 kw = {}
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parents: 5751
diff changeset
176 if use_name:
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parents: 5751
diff changeset
177 kw['name'] = name
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parents: 5751
diff changeset
178 if conn is None:
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parents: 5751
diff changeset
179 conn = self.conn
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parents: 5751
diff changeset
180 return conn.cursor(*args, **kw)
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parents: 5751
diff changeset
181
2082
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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parents: 2077
diff changeset
182 def open_connection(self):
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b1704ba7be41 make mysql / postgresql work again. beginnings of otk/session store in rdbmses
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parents: 2073
diff changeset
183 if not db_exists(self.config):
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parents: 2073
diff changeset
184 db_create(self.config)
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parents: 2073
diff changeset
185
2082
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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parents: 2077
diff changeset
186 self.conn, self.cursor = self.sql_open_connection()
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parents:
diff changeset
187
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parents:
diff changeset
188 try:
2073
261c2e6ceb1e *** empty log message ***
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parents: 2005
diff changeset
189 self.load_dbschema()
5248
198b6e810c67 Use Python-3-compatible 'as' syntax for except statements
Eric S. Raymond <esr@thyrsus.com>
parents: 5118
diff changeset
190 except ProgrammingError as message:
3739
f1363e19121a fix error detection for non-EN locales of postgres [SF#1592249]
Richard Jones <richard@users.sourceforge.net>
parents: 3717
diff changeset
191 if str(message).find('schema') == -1:
2736
402d6d556558 postgres backend open doesn't hide corruption in schema [SF#956375]
Richard Jones <richard@users.sourceforge.net>
parents: 2721
diff changeset
192 raise
1873
f63aa57386b0 Backend improvements.
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parents:
diff changeset
193 self.rollback()
2075
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parents: 2073
diff changeset
194 self.init_dbschema()
1873
f63aa57386b0 Backend improvements.
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parents:
diff changeset
195 self.sql("CREATE TABLE schema (schema TEXT)")
2098
18addf2a8596 Implemented proper datatypes in mysql and postgresql backends...
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parents: 2093
diff changeset
196 self.sql("CREATE TABLE dual (dummy integer)")
18addf2a8596 Implemented proper datatypes in mysql and postgresql backends...
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parents: 2093
diff changeset
197 self.sql("insert into dual values (1)")
2073
261c2e6ceb1e *** empty log message ***
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parents: 2005
diff changeset
198 self.create_version_2_tables()
6587
4f8fc55730e1 Add words_both_idx to newly created databases.
John Rouillard <rouilj@ieee.org>
parents: 6433
diff changeset
199 self.fix_version_3_tables()
5319
62de601bdf6f Fix commits although a Reject exception is raised
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parents: 5248
diff changeset
200 # Need to commit here, otherwise otk/session will not find
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parents: 5248
diff changeset
201 # the necessary tables (in a parallel connection!)
62de601bdf6f Fix commits although a Reject exception is raised
Ralf Schlatterbeck <rsc@runtux.com>
parents: 5248
diff changeset
202 self.commit()
6604
0d99ae7c8de6 Allow Roundup to use PostgreSQL database native full text search
John Rouillard <rouilj@ieee.org>
parents: 6599
diff changeset
203 self._add_fts_table()
0d99ae7c8de6 Allow Roundup to use PostgreSQL database native full text search
John Rouillard <rouilj@ieee.org>
parents: 6599
diff changeset
204 self.commit()
2073
261c2e6ceb1e *** empty log message ***
Richard Jones <richard@users.sourceforge.net>
parents: 2005
diff changeset
205
6433
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
206 def checkpoint_data(self):
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parents: 6332
diff changeset
207 """Commit the state of the database. Allows recovery/retry
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
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parents: 6332
diff changeset
208 of operation in exception handler because postgres
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John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
209 requires a rollback in case of error generating exception
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
210 """
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
211 self.commit()
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
212
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
213 def restore_connection_on_error(self):
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
214 """Postgres leaves a cursor in an unusable state after
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
215 an error. Rollback the transaction to recover and
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
216 permit a retry of the failed statement. Used with
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
217 checkpoint_data to handle uniqueness conflict in
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
218 import_table()
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
219 """
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
220 self.rollback()
c1d3fbcdbfbd issue2551142 - Import of retired node ... unique constraint failure.
John Rouillard <rouilj@ieee.org>
parents: 6332
diff changeset
221
2073
261c2e6ceb1e *** empty log message ***
Richard Jones <richard@users.sourceforge.net>
parents: 2005
diff changeset
222 def create_version_2_tables(self):
2093
3f6024ab2c7a That's the last of the RDBMS migration steps done! Yay!
Richard Jones <richard@users.sourceforge.net>
parents: 2089
diff changeset
223 # OTK store
2514
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Richard Jones <richard@users.sourceforge.net>
parents: 2424
diff changeset
224 self.sql('''CREATE TABLE otks (otk_key VARCHAR(255),
2721
1cd01cf106e1 extend OTK and session table value cols to TEXT [SF#1031271]
Richard Jones <richard@users.sourceforge.net>
parents: 2719
diff changeset
225 otk_value TEXT, otk_time REAL)''')
2514
091711fb2f8c Initial logging integration: replace all debug prints with logging calls...
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parents: 2424
diff changeset
226 self.sql('CREATE INDEX otks_key_idx ON otks(otk_key)')
2093
3f6024ab2c7a That's the last of the RDBMS migration steps done! Yay!
Richard Jones <richard@users.sourceforge.net>
parents: 2089
diff changeset
227
3f6024ab2c7a That's the last of the RDBMS migration steps done! Yay!
Richard Jones <richard@users.sourceforge.net>
parents: 2089
diff changeset
228 # Sessions store
2514
091711fb2f8c Initial logging integration: replace all debug prints with logging calls...
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parents: 2424
diff changeset
229 self.sql('''CREATE TABLE sessions (
2413
7d0bb6601809 fix some column datatypes in postgresql and mysql
Richard Jones <richard@users.sourceforge.net>
parents: 2256
diff changeset
230 session_key VARCHAR(255), session_time REAL,
2721
1cd01cf106e1 extend OTK and session table value cols to TEXT [SF#1031271]
Richard Jones <richard@users.sourceforge.net>
parents: 2719
diff changeset
231 session_value TEXT)''')
2514
091711fb2f8c Initial logging integration: replace all debug prints with logging calls...
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parents: 2424
diff changeset
232 self.sql('''CREATE INDEX sessions_key_idx ON
2098
18addf2a8596 Implemented proper datatypes in mysql and postgresql backends...
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parents: 2093
diff changeset
233 sessions(session_key)''')
1873
f63aa57386b0 Backend improvements.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
234
2093
3f6024ab2c7a That's the last of the RDBMS migration steps done! Yay!
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parents: 2089
diff changeset
235 # full-text indexing store
2514
091711fb2f8c Initial logging integration: replace all debug prints with logging calls...
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parents: 2424
diff changeset
236 self.sql('CREATE SEQUENCE ___textids_ids')
091711fb2f8c Initial logging integration: replace all debug prints with logging calls...
Richard Jones <richard@users.sourceforge.net>
parents: 2424
diff changeset
237 self.sql('''CREATE TABLE __textids (
2098
18addf2a8596 Implemented proper datatypes in mysql and postgresql backends...
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parents: 2093
diff changeset
238 _textid integer primary key, _class VARCHAR(255),
18addf2a8596 Implemented proper datatypes in mysql and postgresql backends...
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parents: 2093
diff changeset
239 _itemid VARCHAR(255), _prop VARCHAR(255))''')
6593
e70e2789bc2c issue2551189 - increase text search maxlength
John Rouillard <rouilj@ieee.org>
parents: 6587
diff changeset
240 self.sql('''CREATE TABLE __words (_word VARCHAR(%s),
e70e2789bc2c issue2551189 - increase text search maxlength
John Rouillard <rouilj@ieee.org>
parents: 6587
diff changeset
241 _textid integer)''' % (self.indexer.maxlength + 5))
2514
091711fb2f8c Initial logging integration: replace all debug prints with logging calls...
Richard Jones <richard@users.sourceforge.net>
parents: 2424
diff changeset
242 self.sql('CREATE INDEX words_word_idx ON __words(_word)')
3858
bb30bbfc7cdd Indexing fixes.
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 3739
diff changeset
243 self.sql('CREATE INDEX words_by_id ON __words (_textid)')
bb30bbfc7cdd Indexing fixes.
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 3739
diff changeset
244 self.sql('CREATE UNIQUE INDEX __textids_by_props ON '
bb30bbfc7cdd Indexing fixes.
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 3739
diff changeset
245 '__textids (_class, _itemid, _prop)')
2093
3f6024ab2c7a That's the last of the RDBMS migration steps done! Yay!
Richard Jones <richard@users.sourceforge.net>
parents: 2089
diff changeset
246
2413
7d0bb6601809 fix some column datatypes in postgresql and mysql
Richard Jones <richard@users.sourceforge.net>
parents: 2256
diff changeset
247 def fix_version_2_tables(self):
7d0bb6601809 fix some column datatypes in postgresql and mysql
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parents: 2256
diff changeset
248 # Convert journal date column to TIMESTAMP, params column to TEXT
7d0bb6601809 fix some column datatypes in postgresql and mysql
Richard Jones <richard@users.sourceforge.net>
parents: 2256
diff changeset
249 self._convert_journal_tables()
7d0bb6601809 fix some column datatypes in postgresql and mysql
Richard Jones <richard@users.sourceforge.net>
parents: 2256
diff changeset
250
7d0bb6601809 fix some column datatypes in postgresql and mysql
Richard Jones <richard@users.sourceforge.net>
parents: 2256
diff changeset
251 # Convert all String properties to TEXT
7d0bb6601809 fix some column datatypes in postgresql and mysql
Richard Jones <richard@users.sourceforge.net>
parents: 2256
diff changeset
252 self._convert_string_properties()
7d0bb6601809 fix some column datatypes in postgresql and mysql
Richard Jones <richard@users.sourceforge.net>
parents: 2256
diff changeset
253
7d0bb6601809 fix some column datatypes in postgresql and mysql
Richard Jones <richard@users.sourceforge.net>
parents: 2256
diff changeset
254 # convert session / OTK *_time columns to REAL
7d0bb6601809 fix some column datatypes in postgresql and mysql
Richard Jones <richard@users.sourceforge.net>
parents: 2256
diff changeset
255 for name in ('otk', 'session'):
2514
091711fb2f8c Initial logging integration: replace all debug prints with logging calls...
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parents: 2424
diff changeset
256 self.sql('drop index %ss_key_idx'%name)
091711fb2f8c Initial logging integration: replace all debug prints with logging calls...
Richard Jones <richard@users.sourceforge.net>
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diff changeset
257 self.sql('drop table %ss'%name)
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258 self.sql('''CREATE TABLE %ss (%s_key VARCHAR(255),
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259 %s_value VARCHAR(255), %s_time REAL)'''%(name, name, name,
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260 name))
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261 self.sql('CREATE INDEX %ss_key_idx ON %ss(%s_key)'%(name, name,
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262 name))
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263
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264 def fix_version_3_tables(self):
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265 rdbms_common.Database.fix_version_3_tables(self)
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266 self.sql('''CREATE INDEX words_both_idx ON public.__words
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267 USING btree (_word, _textid)''')
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268
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269 def _add_fts_table(self):
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270 self.sql('CREATE TABLE __fts (_class VARCHAR(255), '
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271 '_itemid VARCHAR(255), _prop VARCHAR(255), _tsv tsvector)'
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272 )
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273
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274 self.sql('CREATE INDEX __fts_idx ON __fts USING GIN (_tsv)')
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275
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276 def fix_version_6_tables(self):
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277 # Modify length for __words._word column.
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278 c = self.cursor
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279 sql = 'alter table __words alter column _word type varchar(%s)' % (
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280 self.arg)
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281 # Why magic number 5? It was the original offset between
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282 # column length and maxlength.
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283 c.execute(sql, (self.indexer.maxlength + 5,))
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284
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285 self._add_fts_table()
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286
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287 def add_actor_column(self):
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288 # update existing tables to have the new actor column
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289 tables = self.database_schema['tables']
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290 for name in tables:
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291 self.sql('ALTER TABLE _%s add __actor VARCHAR(255)'%name)
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292
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293 def __repr__(self):
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294 return '<roundpsycopgsql 0x%x>' % id(self)
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295
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296 def sql_stringquote(self, value):
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297 ''' psycopg2.QuotedString returns a "buffer" object with the
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298 single-quotes around it... '''
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299 return str(QuotedString(str(value)))[1:-1]
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300
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301 def sql_index_exists(self, table_name, index_name):
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302 sql = 'select count(*) from pg_indexes where ' \
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303 'tablename=%s and indexname=%s'%(self.arg, self.arg)
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304 self.sql(sql, (table_name, index_name))
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305 return self.cursor.fetchone()[0]
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306
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307 def create_class_table(self, spec, create_sequence=1):
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308 if create_sequence:
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309 sql = 'CREATE SEQUENCE _%s_ids'%spec.classname
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310 self.sql(sql)
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311
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312 return rdbms_common.Database.create_class_table(self, spec)
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313
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314 def drop_class_table(self, cn):
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315 sql = 'drop table _%s'%cn
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316 self.sql(sql)
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317
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318 sql = 'drop sequence _%s_ids'%cn
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319 self.sql(sql)
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320
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321 def newid(self, classname):
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322 sql = "select nextval('_%s_ids') from dual"%classname
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323 self.sql(sql)
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324 return str(self.cursor.fetchone()[0])
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325
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326 def setid(self, classname, setid):
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327 sql = "select setval('_%s_ids', %s) from dual"%(classname, int(setid))
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328 self.sql(sql)
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329
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330 def clear(self):
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331 rdbms_common.Database.clear(self)
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332
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333 # reset the sequences
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334 for cn in self.classes:
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335 self.cursor.execute('DROP SEQUENCE _%s_ids'%cn)
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336 self.cursor.execute('CREATE SEQUENCE _%s_ids'%cn)
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337
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338 class PostgresqlClass:
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339 order_by_null_values = '(%s is not NULL)'
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340 case_insensitive_like = 'ILIKE'
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341
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342 class Class(PostgresqlClass, rdbms_common.Class):
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343 pass
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344 class IssueClass(PostgresqlClass, rdbms_common.IssueClass):
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345 pass
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346 class FileClass(PostgresqlClass, rdbms_common.FileClass):
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347 pass
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348
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349 # vim: set et sts=4 sw=4 :
Roundup Issue Tracker: http://roundup-tracker.org/