mirror of https://github.com/django/django.git
Fixed #8901 -- Reapplied r13328 (with extra docs) now that we have a 1.3 development branch.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@13363 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Russell Keith-Magee
parent
b46639f570
commit
6ab3fea113
1
AUTHORS
1
AUTHORS
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@ -220,6 +220,7 @@ answer newbie questions, and generally made Django that much better:
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Kieran Holland <http://www.kieranholland.com>
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Sung-Jin Hong <serialx.net@gmail.com>
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Leo "hylje" Honkanen <sealage@gmail.com>
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Matt Hoskins <skaffenuk@googlemail.com>
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Tareque Hossain <http://www.codexn.com>
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Richard House <Richard.House@i-logue.com>
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Robert Rock Howard <http://djangomojo.com/>
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@ -1,4 +1,5 @@
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from django.db.backends.creation import BaseDatabaseCreation
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from django.db.backends.util import truncate_name
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class DatabaseCreation(BaseDatabaseCreation):
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# This dictionary maps Field objects to their associated PostgreSQL column
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@ -51,7 +52,7 @@ class DatabaseCreation(BaseDatabaseCreation):
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def get_index_sql(index_name, opclass=''):
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return (style.SQL_KEYWORD('CREATE INDEX') + ' ' +
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style.SQL_TABLE(qn(index_name)) + ' ' +
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style.SQL_TABLE(qn(truncate_name(index_name,self.connection.ops.max_name_length()))) + ' ' +
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style.SQL_KEYWORD('ON') + ' ' +
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style.SQL_TABLE(qn(db_table)) + ' ' +
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"(%s%s)" % (style.SQL_FIELD(qn(f.column)), opclass) +
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@ -54,7 +54,9 @@ class DatabaseOperations(BaseDatabaseOperations):
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return '%s'
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def last_insert_id(self, cursor, table_name, pk_name):
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cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
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# Use pg_get_serial_sequence to get the underlying sequence name
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# from the table name and column name (available since PostgreSQL 8)
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cursor.execute("SELECT CURRVAL(pg_get_serial_sequence('%s','%s'))" % (table_name, pk_name))
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return cursor.fetchone()[0]
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def no_limit_value(self):
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@ -90,13 +92,14 @@ class DatabaseOperations(BaseDatabaseOperations):
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for sequence_info in sequences:
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table_name = sequence_info['table']
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column_name = sequence_info['column']
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if column_name and len(column_name) > 0:
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sequence_name = '%s_%s_seq' % (table_name, column_name)
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else:
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sequence_name = '%s_id_seq' % table_name
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sql.append("%s setval('%s', 1, false);" % \
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if not (column_name and len(column_name) > 0):
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# This will be the case if it's an m2m using an autogenerated
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# intermediate table (see BaseDatabaseIntrospection.sequence_list)
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column_name = 'id'
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sql.append("%s setval(pg_get_serial_sequence('%s','%s'), 1, false);" % \
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(style.SQL_KEYWORD('SELECT'),
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style.SQL_FIELD(self.quote_name(sequence_name)))
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style.SQL_TABLE(table_name),
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style.SQL_FIELD(column_name))
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)
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return sql
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else:
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@ -110,11 +113,15 @@ class DatabaseOperations(BaseDatabaseOperations):
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# Use `coalesce` to set the sequence for each model to the max pk value if there are records,
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# or 1 if there are none. Set the `is_called` property (the third argument to `setval`) to true
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# if there are records (as the max pk value is already in use), otherwise set it to false.
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# Use pg_get_serial_sequence to get the underlying sequence name from the table name
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# and column name (available since PostgreSQL 8)
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for f in model._meta.local_fields:
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if isinstance(f, models.AutoField):
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output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
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output.append("%s setval(pg_get_serial_sequence('%s','%s'), coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
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(style.SQL_KEYWORD('SELECT'),
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style.SQL_FIELD(qn('%s_%s_seq' % (model._meta.db_table, f.column))),
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style.SQL_TABLE(model._meta.db_table),
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style.SQL_FIELD(f.column),
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style.SQL_FIELD(qn(f.column)),
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style.SQL_FIELD(qn(f.column)),
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style.SQL_KEYWORD('IS NOT'),
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@ -123,9 +130,10 @@ class DatabaseOperations(BaseDatabaseOperations):
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break # Only one AutoField is allowed per model, so don't bother continuing.
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for f in model._meta.many_to_many:
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if not f.rel.through:
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output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
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output.append("%s setval(pg_get_serial_sequence('%s','%s'), coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
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(style.SQL_KEYWORD('SELECT'),
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style.SQL_FIELD(qn('%s_id_seq' % f.m2m_db_table())),
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style.SQL_TABLE(model._meta.db_table),
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style.SQL_FIELD('id'),
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style.SQL_FIELD(qn('id')),
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style.SQL_FIELD(qn('id')),
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style.SQL_KEYWORD('IS NOT'),
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@ -18,6 +18,22 @@ documentation or reference manuals.
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PostgreSQL notes
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================
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.. versionchanged:: 1.3
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Django supports PostgreSQL 8.0 and higher. If you want to use
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:ref:`database-level autocommit <postgresql-autocommit-mode>`, a
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minimum version of PostgreSQL 8.2 is required.
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.. admonition:: Improvements in recent PostgreSQL versions
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PostgreSQL 8.0 and 8.1 `will soon reach end-of-life`_; there have
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also been a number of significant performance improvements added
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in recent PostgreSQL versions. Although PostgreSQL 8.0 is the minimum
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supported version, you would be well advised to use a more recent
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version if at all possible.
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.. _will soon reach end-of-life: http://wiki.postgresql.org/wiki/PostgreSQL_Release_Support_Policy
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PostgreSQL 8.2 to 8.2.4
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-----------------------
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@ -39,6 +55,8 @@ database connection is first used and commits the result at the end of the
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request/response handling. The PostgreSQL backends normally operate the same
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as any other Django backend in this respect.
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.. _postgresql-autocommit-mode:
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Autocommit mode
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~~~~~~~~~~~~~~~
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@ -84,6 +102,7 @@ protection for multi-call operations.
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Indexes for ``varchar`` and ``text`` columns
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. versionadded:: 1.1.2
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When specifying ``db_index=True`` on your model fields, Django typically
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@ -1,5 +1,7 @@
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from django.conf import settings
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from django.db import models
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from django.db import connection
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from django.db import connection, DEFAULT_DB_ALIAS
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class Square(models.Model):
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root = models.IntegerField()
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@ -8,6 +10,7 @@ class Square(models.Model):
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def __unicode__(self):
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return "%s ** 2 == %s" % (self.root, self.square)
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class Person(models.Model):
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first_name = models.CharField(max_length=20)
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last_name = models.CharField(max_length=20)
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@ -15,11 +18,25 @@ class Person(models.Model):
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def __unicode__(self):
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return u'%s %s' % (self.first_name, self.last_name)
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class SchoolClass(models.Model):
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year = models.PositiveIntegerField()
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day = models.CharField(max_length=9, blank=True)
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last_updated = models.DateTimeField()
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# Unfortunately, the following model breaks MySQL hard.
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# Until #13711 is fixed, this test can't be run under MySQL.
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if settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE'] != 'django.db.backends.mysql':
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class VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ(models.Model):
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class Meta:
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# We need to use a short actual table name or
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# we hit issue #8548 which we're not testing!
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verbose_name = 'model_with_long_table_name'
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primary_key_is_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = models.AutoField(primary_key=True)
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charfield_is_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = models.CharField(max_length=100)
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m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz = models.ManyToManyField(Person,blank=True)
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qn = connection.ops.quote_name
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__test__ = {'API_TESTS': """
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@ -1,13 +1,17 @@
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# -*- coding: utf-8 -*-
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# Unit and doctests for specific database backends.
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import datetime
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import models
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import unittest
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from django.conf import settings
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from django.core import management
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from django.core.management.color import no_style
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from django.db import backend, connection, DEFAULT_DB_ALIAS
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from django.db.backends.signals import connection_created
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from django.conf import settings
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from django.test import TestCase
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from regressiontests.backends import models
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class Callproc(unittest.TestCase):
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def test_dbms_session(self):
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@ -76,6 +80,7 @@ class DateQuotingTest(TestCase):
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classes = models.SchoolClass.objects.filter(last_updated__day=20)
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self.assertEqual(len(classes), 1)
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class ParameterHandlingTest(TestCase):
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def test_bad_parameter_count(self):
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"An executemany call with too many/not enough parameters will raise an exception (Refs #12612)"
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@ -88,6 +93,50 @@ class ParameterHandlingTest(TestCase):
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self.assertRaises(Exception, cursor.executemany, query, [(1,2,3),])
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self.assertRaises(Exception, cursor.executemany, query, [(1,),])
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# Unfortunately, the following tests would be a good test to run on all
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# backends, but it breaks MySQL hard. Until #13711 is fixed, it can't be run
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# everywhere (although it would be an effective test of #13711).
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if settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE'] != 'django.db.backends.mysql':
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class LongNameTest(TestCase):
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"""Long primary keys and model names can result in a sequence name
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that exceeds the database limits, which will result in truncation
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on certain databases (e.g., Postgres). The backend needs to use
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the correct sequence name in last_insert_id and other places, so
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check it is. Refs #8901.
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"""
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def test_sequence_name_length_limits_create(self):
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"""Test creation of model with long name and long pk name doesn't error. Ref #8901"""
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models.VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ.objects.create()
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def test_sequence_name_length_limits_m2m(self):
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"""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"""
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obj = models.VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ.objects.create()
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rel_obj = models.Person.objects.create(first_name='Django', last_name='Reinhardt')
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obj.m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.add(rel_obj)
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def test_sequence_name_length_limits_flush(self):
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"""Test that sequence resetting as part of a flush with model with long name and long pk name doesn't error. Ref #8901"""
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# A full flush is expensive to the full test, so we dig into the
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# internals to generate the likely offending SQL and run it manually
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# Some convenience aliases
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VLM = models.VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
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VLM_m2m = VLM.m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.through
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tables = [
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VLM._meta.db_table,
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VLM_m2m._meta.db_table,
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]
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sequences = [
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{
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'column': VLM._meta.pk.column,
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'table': VLM._meta.db_table
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},
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]
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cursor = connection.cursor()
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for statement in connection.ops.sql_flush(no_style(), tables, sequences):
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cursor.execute(statement)
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def connection_created_test(sender, **kwargs):
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print 'connection_created signal'
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