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annotate roundup/backends/back_postgresql.py @ 3715:50add98cbbac

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change as per last message in patch [SF#1429391]
author Richard Jones <richard@users.sourceforge.net>
date Tue, 03 Oct 2006 23:15:09 +0000
parents ff9f4ca42454
children 5770f1802cd0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3715
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1 #$Id: back_postgresql.py,v 1.35 2006-10-03 23:15:09 richard Exp $
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2 #
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3 # Copyright (c) 2003 Martynas Sklyzmantas, Andrey Lebedev <andrey@micro.lt>
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4 #
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5 # This module is free software, and you may redistribute it and/or modify
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6 # under the same terms as Python, so long as this copyright message and
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7 # disclaimer are retained in their original form.
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8 #
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9 '''Postgresql backend via psycopg for Roundup.'''
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10 __docformat__ = 'restructuredtext'
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11
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12 import os, shutil, popen2, time
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13 try:
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14 import psycopg
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15 from psycopg import QuotedString
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16 except:
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17 from psycopg2 import psycopg1 as psycopg
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18 from psycopg2.extensions import QuotedString
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19 import logging
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20
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21 from roundup import hyperdb, date
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22 from roundup.backends import rdbms_common
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23
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24 def connection_dict(config, dbnamestr=None):
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25 ''' read_default_group is MySQL-specific, ignore it '''
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26 d = rdbms_common.connection_dict(config, dbnamestr)
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27 if d.has_key('read_default_group'):
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28 del d['read_default_group']
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29 if d.has_key('read_default_file'):
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30 del d['read_default_file']
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31 return d
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32
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33 def db_create(config):
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34 """Clear all database contents and drop database itself"""
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35 command = "CREATE DATABASE %s WITH ENCODING='UNICODE'"%config.RDBMS_NAME
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36 logging.getLogger('hyperdb').info(command)
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37 db_command(config, command)
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38
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39 def db_nuke(config, fail_ok=0):
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40 """Clear all database contents and drop database itself"""
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41 command = 'DROP DATABASE %s'% config.RDBMS_NAME
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42 logging.getLogger('hyperdb').info(command)
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43 db_command(config, command)
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44
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45 if os.path.exists(config.DATABASE):
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46 shutil.rmtree(config.DATABASE)
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47
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48 def db_command(config, command):
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49 '''Perform some sort of database-level command. Retry 10 times if we
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50 fail by conflicting with another user.
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51 '''
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52 template1 = connection_dict(config)
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53 template1['database'] = 'template1'
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54
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55 try:
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56 conn = psycopg.connect(**template1)
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57 except psycopg.OperationalError, message:
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58 raise hyperdb.DatabaseError, message
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59
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60 conn.set_isolation_level(0)
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61 cursor = conn.cursor()
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62 try:
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63 for n in range(10):
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64 if pg_command(cursor, command):
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65 return
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66 finally:
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67 conn.close()
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68 raise RuntimeError, '10 attempts to create database failed'
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69
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70 def pg_command(cursor, command):
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71 '''Execute the postgresql command, which may be blocked by some other
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72 user connecting to the database, and return a true value if it succeeds.
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73 '''
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74 try:
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75 cursor.execute(command)
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76 except psycopg.ProgrammingError, err:
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77 response = str(err).split('\n')[0]
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78 if response.find('FATAL') != -1:
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79 raise RuntimeError, response
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80 elif response.find('ERROR') != -1:
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81 if response.find('is being accessed by other users') == -1:
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82 raise RuntimeError, response
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83 time.sleep(1)
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84 return 0
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85 return 1
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86
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87 def db_exists(config):
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88 """Check if database already exists"""
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89 db = connection_dict(config, 'database')
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90 try:
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91 conn = psycopg.connect(**db)
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92 conn.close()
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93 return 1
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94 except:
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95 return 0
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96
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97 class Database(rdbms_common.Database):
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98 arg = '%s'
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99
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100 # used by some code to switch styles of query
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101 implements_intersect = 1
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102
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103 def sql_open_connection(self):
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104 db = connection_dict(self.config, 'database')
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105 logging.getLogger('hyperdb').info('open database %r'%db['database'])
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106 try:
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107 conn = psycopg.connect(**db)
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108 except psycopg.OperationalError, message:
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109 raise hyperdb.DatabaseError, message
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110
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111 cursor = conn.cursor()
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112
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113 return (conn, cursor)
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114
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115 def open_connection(self):
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116 if not db_exists(self.config):
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117 db_create(self.config)
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118
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119 self.conn, self.cursor = self.sql_open_connection()
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120
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121 try:
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122 self.load_dbschema()
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123 except psycopg.ProgrammingError, message:
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124 if str(message).find('"schema" does not exist') == -1:
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125 raise
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126 self.rollback()
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127 self.init_dbschema()
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128 self.sql("CREATE TABLE schema (schema TEXT)")
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129 self.sql("CREATE TABLE dual (dummy integer)")
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130 self.sql("insert into dual values (1)")
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131 self.create_version_2_tables()
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132
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133 def create_version_2_tables(self):
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134 # OTK store
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135 self.sql('''CREATE TABLE otks (otk_key VARCHAR(255),
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136 otk_value TEXT, otk_time REAL)''')
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137 self.sql('CREATE INDEX otks_key_idx ON otks(otk_key)')
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138
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139 # Sessions store
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140 self.sql('''CREATE TABLE sessions (
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141 session_key VARCHAR(255), session_time REAL,
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142 session_value TEXT)''')
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143 self.sql('''CREATE INDEX sessions_key_idx ON
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144 sessions(session_key)''')
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145
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146 # full-text indexing store
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147 self.sql('CREATE SEQUENCE ___textids_ids')
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148 self.sql('''CREATE TABLE __textids (
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149 _textid integer primary key, _class VARCHAR(255),
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150 _itemid VARCHAR(255), _prop VARCHAR(255))''')
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151 self.sql('''CREATE TABLE __words (_word VARCHAR(30),
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152 _textid integer)''')
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153 self.sql('CREATE INDEX words_word_idx ON __words(_word)')
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154
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155 def fix_version_2_tables(self):
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156 # Convert journal date column to TIMESTAMP, params column to TEXT
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157 self._convert_journal_tables()
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158
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159 # Convert all String properties to TEXT
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160 self._convert_string_properties()
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161
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162 # convert session / OTK *_time columns to REAL
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163 for name in ('otk', 'session'):
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164 self.sql('drop index %ss_key_idx'%name)
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165 self.sql('drop table %ss'%name)
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166 self.sql('''CREATE TABLE %ss (%s_key VARCHAR(255),
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167 %s_value VARCHAR(255), %s_time REAL)'''%(name, name, name,
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168 name))
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169 self.sql('CREATE INDEX %ss_key_idx ON %ss(%s_key)'%(name, name,
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170 name))
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171
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172 def fix_version_3_tables(self):
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173 rdbms_common.Database.fix_version_3_tables(self)
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174 self.sql('''CREATE INDEX words_both_idx ON public.__words
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175 USING btree (_word, _textid)''')
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176
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177 def add_actor_column(self):
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178 # update existing tables to have the new actor column
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179 tables = self.database_schema['tables']
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180 for name in tables.keys():
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181 self.sql('ALTER TABLE _%s add __actor VARCHAR(255)'%name)
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182
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183 def __repr__(self):
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184 return '<roundpsycopgsql 0x%x>' % id(self)
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185
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186 def sql_commit(self, fail_ok=False):
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187 ''' Actually commit to the database.
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188 '''
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189 logging.getLogger('hyperdb').info('commit')
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190
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191 try:
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192 self.conn.commit()
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193 except psycopg.ProgrammingError, message:
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194 # we've been instructed that this commit is allowed to fail
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195 if fail_ok and str(message).endswith('could not serialize '
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196 'access due to concurrent update'):
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197 logging.getLogger('hyperdb').info('commit FAILED, but fail_ok')
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198 else:
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199 raise
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200
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201 # open a new cursor for subsequent work
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202 self.cursor = self.conn.cursor()
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203
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204 def sql_stringquote(self, value):
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205 ''' psycopg.QuotedString returns a "buffer" object with the
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206 single-quotes around it... '''
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207 return str(QuotedString(str(value)))[1:-1]
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208
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209 def sql_index_exists(self, table_name, index_name):
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210 sql = 'select count(*) from pg_indexes where ' \
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211 'tablename=%s and indexname=%s'%(self.arg, self.arg)
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212 self.sql(sql, (table_name, index_name))
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213 return self.cursor.fetchone()[0]
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214
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215 def create_class_table(self, spec, create_sequence=1):
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216 if create_sequence:
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217 sql = 'CREATE SEQUENCE _%s_ids'%spec.classname
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218 self.sql(sql)
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219
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220 return rdbms_common.Database.create_class_table(self, spec)
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221
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222 def drop_class_table(self, cn):
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223 sql = 'drop table _%s'%cn
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224 self.sql(sql)
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225
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226 sql = 'drop sequence _%s_ids'%cn
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227 self.sql(sql)
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228
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229 def newid(self, classname):
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230 sql = "select nextval('_%s_ids') from dual"%classname
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231 self.sql(sql)
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232 return self.cursor.fetchone()[0]
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233
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234 def setid(self, classname, setid):
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235 sql = "select setval('_%s_ids', %s) from dual"%(classname, int(setid))
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236 self.sql(sql)
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237
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238 def clear(self):
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239 rdbms_common.Database.clear(self)
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240
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241 # reset the sequences
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242 for cn in self.classes.keys():
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243 self.cursor.execute('DROP SEQUENCE _%s_ids'%cn)
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244 self.cursor.execute('CREATE SEQUENCE _%s_ids'%cn)
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245
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246 class PostgresqlClass:
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247 order_by_null_values = '(%s is not NULL)'
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248
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249 class Class(PostgresqlClass, rdbms_common.Class):
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250 pass
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251 class IssueClass(PostgresqlClass, rdbms_common.IssueClass):
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252 pass
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253 class FileClass(PostgresqlClass, rdbms_common.FileClass):
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254 pass
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255
Roundup Issue Tracker: http://roundup-tracker.org/