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Fixed #8901 -- Corrected the PostgreSQL sequence reset code when field identifiers exceed the maximum identifier length. Thanks to adam@zuerchertech.com for the report, and Matt Hoskins for the patch. 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13328 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Russell Keith-Magee 2010-06-07 15:47:19 +00:00
parent 9ebf411f26
commit 21a690fcfe
5 changed files with 91 additions and 15 deletions
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1
AUTHORS
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@ -220,6 +220,7 @@ answer newbie questions, and generally made Django that much better:
Kieran Holland <http://www.kieranholland.com>
Sung-Jin Hong <serialx.net@gmail.com>
Leo "hylje" Honkanen <sealage@gmail.com>
Matt Hoskins <skaffenuk@googlemail.com>
Tareque Hossain <http://www.codexn.com>
Richard House <Richard.House@i-logue.com>
Robert Rock Howard <http://djangomojo.com/>

3
django/db/backends/postgresql/creation.py
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@ -1,4 +1,5 @@
from django.db.backends.creation import BaseDatabaseCreation
from django.db.backends.util import truncate_name
class DatabaseCreation(BaseDatabaseCreation):
# This dictionary maps Field objects to their associated PostgreSQL column
@ -51,7 +52,7 @@ class DatabaseCreation(BaseDatabaseCreation):
def get_index_sql(index_name, opclass=''):
return (style.SQL_KEYWORD('CREATE INDEX') + ' ' +
style.SQL_TABLE(qn(index_name)) + ' ' +
style.SQL_TABLE(qn(truncate_name(index_name,self.connection.ops.max_name_length()))) + ' ' +
style.SQL_KEYWORD('ON') + ' ' +
style.SQL_TABLE(qn(db_table)) + ' ' +
"(%s%s)" % (style.SQL_FIELD(qn(f.column)), opclass) +

30
django/db/backends/postgresql/operations.py
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@ -54,7 +54,9 @@ class DatabaseOperations(BaseDatabaseOperations):
return '%s'
def last_insert_id(self, cursor, table_name, pk_name):
cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
# Use pg_get_serial_sequence to get the underlying sequence name
# from the table name and column name (available since PostgreSQL 8)
cursor.execute("SELECT CURRVAL(pg_get_serial_sequence('%s','%s'))" % (table_name, pk_name))
return cursor.fetchone()[0]
def no_limit_value(self):
@ -90,13 +92,14 @@ class DatabaseOperations(BaseDatabaseOperations):
for sequence_info in sequences:
table_name = sequence_info['table']
column_name = sequence_info['column']
if column_name and len(column_name) > 0:
sequence_name = '%s_%s_seq' % (table_name, column_name)
else:
sequence_name = '%s_id_seq' % table_name
sql.append("%s setval('%s', 1, false);" % \
if not (column_name and len(column_name) > 0):
# This will be the case if it's an m2m using an autogenerated
# intermediate table (see BaseDatabaseIntrospection.sequence_list)
column_name = 'id'
sql.append("%s setval(pg_get_serial_sequence('%s','%s'), 1, false);" % \
(style.SQL_KEYWORD('SELECT'),
style.SQL_FIELD(self.quote_name(sequence_name)))
style.SQL_TABLE(table_name),
style.SQL_FIELD(column_name))
)
return sql
else:
@ -110,11 +113,15 @@ class DatabaseOperations(BaseDatabaseOperations):
# Use `coalesce` to set the sequence for each model to the max pk value if there are records,
# or 1 if there are none. Set the `is_called` property (the third argument to `setval`) to true
# if there are records (as the max pk value is already in use), otherwise set it to false.
# Use pg_get_serial_sequence to get the underlying sequence name from the table name
# and column name (available since PostgreSQL 8)
for f in model._meta.local_fields:
if isinstance(f, models.AutoField):
output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
output.append("%s setval(pg_get_serial_sequence('%s','%s'), coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
(style.SQL_KEYWORD('SELECT'),
style.SQL_FIELD(qn('%s_%s_seq' % (model._meta.db_table, f.column))),
style.SQL_TABLE(model._meta.db_table),
style.SQL_FIELD(f.column),
style.SQL_FIELD(qn(f.column)),
style.SQL_FIELD(qn(f.column)),
style.SQL_KEYWORD('IS NOT'),
@ -123,9 +130,10 @@ class DatabaseOperations(BaseDatabaseOperations):
break # Only one AutoField is allowed per model, so don't bother continuing.
for f in model._meta.many_to_many:
if not f.rel.through:
output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
output.append("%s setval(pg_get_serial_sequence('%s','%s'), coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
(style.SQL_KEYWORD('SELECT'),
style.SQL_FIELD(qn('%s_id_seq' % f.m2m_db_table())),
style.SQL_TABLE(model._meta.db_table),
style.SQL_FIELD('id'),
style.SQL_FIELD(qn('id')),
style.SQL_FIELD(qn('id')),
style.SQL_KEYWORD('IS NOT'),

19
tests/regressiontests/backends/models.py
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@ -1,5 +1,7 @@
from django.conf import settings
from django.db import models
from django.db import connection
from django.db import connection, DEFAULT_DB_ALIAS
class Square(models.Model):
root = models.IntegerField()
@ -8,6 +10,7 @@ class Square(models.Model):
def __unicode__(self):
return "%s ** 2 == %s" % (self.root, self.square)
class Person(models.Model):
first_name = models.CharField(max_length=20)
last_name = models.CharField(max_length=20)
@ -15,11 +18,25 @@ class Person(models.Model):
def __unicode__(self):
return u'%s %s' % (self.first_name, self.last_name)
class SchoolClass(models.Model):
year = models.PositiveIntegerField()
day = models.CharField(max_length=9, blank=True)
last_updated = models.DateTimeField()
# Unfortunately, the following model breaks MySQL hard.
# Until #13711 is fixed, this test can't be run under MySQL.
if settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE'] != 'django.db.backends.mysql':
class VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ(models.Model):
class Meta:
# We need to use a short actual table name or
# we hit issue #8548 which we're not testing!
verbose_name = 'model_with_long_table_name'
primary_key_is_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = models.AutoField(primary_key=True)
charfield_is_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = models.CharField(max_length=100)
m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = models.ManyToManyField(Person,blank=True)
qn = connection.ops.quote_name
__test__ = {'API_TESTS': """

53
tests/regressiontests/backends/tests.py
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@ -1,13 +1,17 @@
# -*- coding: utf-8 -*-
# Unit and doctests for specific database backends.
import datetime
import models
import unittest
from django.conf import settings
from django.core import management
from django.core.management.color import no_style
from django.db import backend, connection, DEFAULT_DB_ALIAS
from django.db.backends.signals import connection_created
from django.conf import settings
from django.test import TestCase
from regressiontests.backends import models
class Callproc(unittest.TestCase):
def test_dbms_session(self):
@ -76,6 +80,7 @@ class DateQuotingTest(TestCase):
classes = models.SchoolClass.objects.filter(last_updated__day=20)
self.assertEqual(len(classes), 1)
class ParameterHandlingTest(TestCase):
def test_bad_parameter_count(self):
"An executemany call with too many/not enough parameters will raise an exception (Refs #12612)"
@ -88,6 +93,50 @@ class ParameterHandlingTest(TestCase):
self.assertRaises(Exception, cursor.executemany, query, [(1,2,3),])
self.assertRaises(Exception, cursor.executemany, query, [(1,),])
# Unfortunately, the following tests would be a good test to run on all
# backends, but it breaks MySQL hard. Until #13711 is fixed, it can't be run
# everywhere (although it would be an effective test of #13711).
if settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE'] != 'django.db.backends.mysql':
class LongNameTest(TestCase):
"""Long primary keys and model names can result in a sequence name
that exceeds the database limits, which will result in truncation
on certain databases (e.g., Postgres). The backend needs to use
the correct sequence name in last_insert_id and other places, so
check it is. Refs #8901.
"""
def test_sequence_name_length_limits_create(self):
"""Test creation of model with long name and long pk name doesn't error. Ref #8901"""
models.VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ.objects.create()
def test_sequence_name_length_limits_m2m(self):
"""Test an m2m save of a model with a long name and a long m2m field name doesn't error as on Django >=1.2 this now uses object saves. Ref #8901"""
obj = models.VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ.objects.create()
rel_obj = models.Person.objects.create(first_name='Django', last_name='Reinhardt')
obj.m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.add(rel_obj)
def test_sequence_name_length_limits_flush(self):
"""Test that sequence resetting as part of a flush with model with long name and long pk name doesn't error. Ref #8901"""
# A full flush is expensive to the full test, so we dig into the
# internals to generate the likely offending SQL and run it manually
# Some convenience aliases
VLM = models.VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
VLM_m2m = VLM.m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.through
tables = [
VLM._meta.db_table,
VLM_m2m._meta.db_table,
]
sequences = [
{
'column': VLM._meta.pk.column,
'table': VLM._meta.db_table
},
]
cursor = connection.cursor()
for statement in connection.ops.sql_flush(no_style(), tables, sequences):
cursor.execute(statement)
def connection_created_test(sender, **kwargs):
print 'connection_created signal'