[soc2010/query-refactor] Merged up to trunk r13350.

git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2010/query-refactor@13351 bcc190cf-cafb-0310-a4f2-bffc1f526a37

AUTHORS

@@ -220,7 +220,6 @@ 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/>

django/db/backends/postgresql/creation.py

@@ -1,5 +1,4 @@
 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
@@ -52,7 +51,7 @@ def sql_indexes_for_field(self, model, f, style):
 
             def get_index_sql(index_name, opclass=''):
                 return (style.SQL_KEYWORD('CREATE INDEX') + ' ' +
-                        style.SQL_TABLE(qn(truncate_name(index_name,self.connection.ops.max_name_length()))) + ' ' +
+                        style.SQL_TABLE(qn(index_name)) + ' ' +
                         style.SQL_KEYWORD('ON') + ' ' +
                         style.SQL_TABLE(qn(db_table)) + ' ' +
                         "(%s%s)" % (style.SQL_FIELD(qn(f.column)), opclass) +

django/db/backends/postgresql/operations.py

@@ -54,9 +54,7 @@ def field_cast_sql(self, db_type):
         return '%s'
 
     def last_insert_id(self, cursor, 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))
+        cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
         return cursor.fetchone()[0]
 
     def no_limit_value(self):
@@ -92,14 +90,13 @@ def sql_flush(self, style, tables, sequences):
             for sequence_info in sequences:
                 table_name = sequence_info['table']
                 column_name = sequence_info['column']
-                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);" % \
+                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);" % \
                     (style.SQL_KEYWORD('SELECT'),
-                    style.SQL_TABLE(table_name),
-                    style.SQL_FIELD(column_name))
+                    style.SQL_FIELD(self.quote_name(sequence_name)))
                 )
             return sql
         else:
@@ -113,15 +110,11 @@ def sequence_reset_sql(self, style, model_list):
             # 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(pg_get_serial_sequence('%s','%s'), coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
+                    output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
                         (style.SQL_KEYWORD('SELECT'),
-                        style.SQL_TABLE(model._meta.db_table),
-                        style.SQL_FIELD(f.column),
+                        style.SQL_FIELD(qn('%s_%s_seq' % (model._meta.db_table, f.column))),
                         style.SQL_FIELD(qn(f.column)),
                         style.SQL_FIELD(qn(f.column)),
                         style.SQL_KEYWORD('IS NOT'),
@@ -130,10 +123,9 @@ def sequence_reset_sql(self, style, model_list):
                     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(pg_get_serial_sequence('%s','%s'), coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
+                    output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
                         (style.SQL_KEYWORD('SELECT'),
-                        style.SQL_TABLE(model._meta.db_table),
-                        style.SQL_FIELD('id'),
+                        style.SQL_FIELD(qn('%s_id_seq' % f.m2m_db_table())),
                         style.SQL_FIELD(qn('id')),
                         style.SQL_FIELD(qn('id')),
                         style.SQL_KEYWORD('IS NOT'),

docs/releases/1.2.txt

@@ -21,11 +21,11 @@ Overview
 Django 1.2 introduces several large, important new features, including:
 
     * Support for `multiple database connections`_ in a single Django instance.
-    
+
     * `Model validation`_ inspired by Django's form validation.
-    
+
     * Vastly `improved protection against Cross-Site Request Forgery`_ (CSRF).
-    
+
     * A new `user "messages" framework`_ with support for cookie- and session-based
       message for both anonymous and authenticated users.
 
@@ -49,9 +49,9 @@ be found below`_.
 
 .. seealso::
 
-    `Django Advent`_ covered the release of Django 1.2 with a series of 
+    `Django Advent`_ covered the release of Django 1.2 with a series of
     articles and tutorials that cover some of the new features in depth.
-        
+
 .. _django advent: http://djangoadvent.com/
 
 Wherever possible these features have been introduced in a backwards-compatible
@@ -66,20 +66,20 @@ backwards-incompatible. The big changes are:
     * The new CSRF protection framework is not backwards-compatible with
       the old system. Users of the old system will not be affected until
       the old system is removed in Django 1.4.
-      
+
       However, upgrading to the new CSRF protection framework requires a few
       important backwards-incompatible changes, detailed in `CSRF Protection`_,
       below.
 
     * Authors of custom :class:`~django.db.models.Field` subclasses should be
       aware that a number of methods have had a change in prototype, detailed
       under `get_db_prep_*() methods on Field`_, below.
-      
+
     * The internals of template tags have changed somewhat; authors of custom
       template tags that need to store state (e.g. custom control flow tags)
       should ensure that their code follows the new rules for `stateful template
       tags`_
-    
+
     * The :func:`~django.contrib.auth.decorators.user_passes_test`,
       :func:`~django.contrib.auth.decorators.login_required`, and
       :func:`~django.contrib.auth.decorators.permission_required`, decorators
@@ -435,6 +435,8 @@ database-compatible values. A custom field might look something like::
 
     class CustomModelField(models.Field):
         # ...
+        def db_type(self):
+            # ...
 
         def get_db_prep_save(self, value):
             # ...
@@ -451,6 +453,9 @@ two extra methods have been introduced::
     class CustomModelField(models.Field):
         # ...
 
+        def db_type(self, connection):
+            # ...
+
         def get_prep_value(self, value):
             # ...
 
@@ -467,10 +472,10 @@ two extra methods have been introduced::
             # ...
 
 These changes are required to support multiple databases --
-``get_db_prep_*`` can no longer make any assumptions regarding the
-database for which it is preparing. The ``connection`` argument now
-provides the preparation methods with the specific connection for
-which the value is being prepared.
+``db_type`` and ``get_db_prep_*`` can no longer make any assumptions
+regarding the database for which it is preparing. The ``connection``
+argument now provides the preparation methods with the specific
+connection for which the value is being prepared.
 
 The two new methods exist to differentiate general data-preparation
 requirements from requirements that are database-specific. The
@@ -603,13 +608,13 @@ new keyword and so is not a valid variable name in this tag.
 --------------
 
 ``LazyObject`` is an undocumented-but-often-used utility class used for lazily
-wrapping other objects of unknown type. 
+wrapping other objects of unknown type.
 
 In Django 1.1 and earlier, it handled introspection in a non-standard way,
 depending on wrapped objects implementing a public method named
 ``get_all_members()``. Since this could easily lead to name clashes, it has been
 changed to use the standard Python introspection method, involving
-``__members__`` and ``__dir__()``. 
+``__members__`` and ``__dir__()``.
 
 If you used ``LazyObject`` in your own code
 and implemented the ``get_all_members()`` method for wrapped objects, you'll need

tests/regressiontests/backends/models.py

@@ -1,7 +1,5 @@
-from django.conf import settings
 from django.db import models
-from django.db import connection, DEFAULT_DB_ALIAS
-
+from django.db import connection
 
 class Square(models.Model):
     root = models.IntegerField()
@@ -10,33 +8,18 @@ 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)
 
     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': """

tests/regressiontests/backends/tests.py

@@ -1,17 +1,13 @@
 # -*- 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):
@@ -80,7 +76,6 @@ def test_django_extract(self):
         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)"
@@ -93,50 +88,6 @@ def test_bad_parameter_count(self):
         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'