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Make sure we only create the minimum number of table indexes for MySQL. 

This patch simplifies a bunch of code for all backends and removes some
duplicate index creation for MySQL, in particular (versions 4.x and later).
Patch from Nis Jørgensen.

Fixed #5671, #5680, #7170, #7186.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@7790 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Malcolm Tredinnick 2008-06-30 04:46:59 +00:00
parent b0bc8b9dfd
commit f9df4d1435
8 changed files with 14 additions and 15 deletions
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1
AUTHORS
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@ -192,6 +192,7 @@ answer newbie questions, and generally made Django that much better:
james_027@yahoo.com
jcrasta@gmail.com
Zak Johnson <zakj@nox.cx>
Nis Jørgensen <nis@superlativ.dk>
Michael Josephson <http://www.sdjournal.com/>
jpellerin@gmail.com
junzhang.jn@gmail.com

4
django/core/management/commands/createcachetable.py
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@ -21,10 +21,10 @@ class Command(LabelCommand):
for f in fields:
field_output = [qn(f.name), f.db_type()]
field_output.append("%sNULL" % (not f.null and "NOT " or ""))
if f.unique:
field_output.append("UNIQUE")
if f.primary_key:
field_output.append("PRIMARY KEY")
elif f.unique:
field_output.append("UNIQUE")
if f.db_index:
unique = f.unique and "UNIQUE " or ""
index_output.append("CREATE %sINDEX %s_%s ON %s (%s);" % \

13
django/core/management/sql.py
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@ -268,11 +268,11 @@ def sql_model_create(model, style, known_models=set()):
field_output = [style.SQL_FIELD(qn(f.column)),
style.SQL_COLTYPE(col_type)]
field_output.append(style.SQL_KEYWORD('%sNULL' % (not f.null and 'NOT ' or '')))
if f.unique and (not f.primary_key or connection.features.allows_unique_and_pk):
field_output.append(style.SQL_KEYWORD('UNIQUE'))
if f.primary_key:
field_output.append(style.SQL_KEYWORD('PRIMARY KEY'))
if tablespace and connection.features.supports_tablespaces and (f.unique or f.primary_key) and connection.features.autoindexes_primary_keys:
elif f.unique:
field_output.append(style.SQL_KEYWORD('UNIQUE'))
if tablespace and connection.features.supports_tablespaces and f.unique:
# We must specify the index tablespace inline, because we
# won't be generating a CREATE INDEX statement for this field.
field_output.append(connection.ops.tablespace_sql(tablespace, inline=True))
@ -355,7 +355,7 @@ def many_to_many_sql_for_model(model, style):
for f in opts.local_many_to_many:
if not isinstance(f.rel, generic.GenericRel):
tablespace = f.db_tablespace or opts.db_tablespace
if tablespace and connection.features.supports_tablespaces and connection.features.autoindexes_primary_keys:
if tablespace and connection.features.supports_tablespaces:
tablespace_sql = ' ' + connection.ops.tablespace_sql(tablespace, inline=True)
else:
tablespace_sql = ''
@ -460,15 +460,14 @@ def sql_indexes_for_model(model, style):
qn = connection.ops.quote_name
for f in model._meta.local_fields:
if f.db_index and not ((f.primary_key or f.unique) and connection.features.autoindexes_primary_keys):
unique = f.unique and 'UNIQUE ' or ''
if f.db_index and not f.unique:
tablespace = f.db_tablespace or model._meta.db_tablespace
if tablespace and connection.features.supports_tablespaces:
tablespace_sql = ' ' + connection.ops.tablespace_sql(tablespace)
else:
tablespace_sql = ''
output.append(
style.SQL_KEYWORD('CREATE %sINDEX' % unique) + ' ' + \
style.SQL_KEYWORD('CREATE INDEX') + ' ' + \
style.SQL_TABLE(qn('%s_%s' % (model._meta.db_table, f.column))) + ' ' + \
style.SQL_KEYWORD('ON') + ' ' + \
style.SQL_TABLE(qn(model._meta.db_table)) + ' ' + \

2
django/db/backends/__init__.py
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@ -41,8 +41,6 @@ class BaseDatabaseWrapper(local):
class BaseDatabaseFeatures(object):
allows_group_by_ordinal = True
allows_unique_and_pk = True
autoindexes_primary_keys = True
inline_fk_references = True
needs_datetime_string_cast = True
supports_constraints = True

1
django/db/backends/mysql/base.py
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@ -60,7 +60,6 @@ server_version_re = re.compile(r'(\d{1,2})\.(\d{1,2})\.(\d{1,2})')
# TRADITIONAL will automatically cause most warnings to be treated as errors.
class DatabaseFeatures(BaseDatabaseFeatures):
autoindexes_primary_keys = False
inline_fk_references = False
empty_fetchmany_value = ()
update_can_self_select = False

1
django/db/backends/mysql_old/base.py
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@ -64,7 +64,6 @@ class MysqlDebugWrapper:
return getattr(self.cursor, attr)
class DatabaseFeatures(BaseDatabaseFeatures):
autoindexes_primary_keys = False
inline_fk_references = False
empty_fetchmany_value = ()
update_can_self_select = False

1
django/db/backends/oracle/base.py
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@ -24,7 +24,6 @@ IntegrityError = Database.IntegrityError
class DatabaseFeatures(BaseDatabaseFeatures):
allows_group_by_ordinal = False
allows_unique_and_pk = False # Suppress UNIQUE/PK for Oracle (ORA-02259)
empty_fetchmany_value = ()
needs_datetime_string_cast = False
supports_tablespaces = True

6
django/db/models/fields/__init__.py
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@ -91,7 +91,7 @@ class Field(object):
self.name = name
self.verbose_name = verbose_name
self.primary_key = primary_key
self.max_length, self.unique = max_length, unique
self.max_length, self._unique = max_length, unique
self.blank, self.null = blank, null
# Oracle treats the empty string ('') as null, so coerce the null
# option whenever '' is a possible value.
@ -168,6 +168,10 @@ class Field(object):
except KeyError:
return None
def unique(self):
return self._unique or self.primary_key
unique = property(unique)
def validate_full(self, field_data, all_data):
"""
Returns a list of errors for this field. This is the main interface,