diff --git a/django/core/management/commands/sqldropindexes.py b/django/core/management/commands/sqldropindexes.py new file mode 100644 index 0000000000..fce77211fb --- /dev/null +++ b/django/core/management/commands/sqldropindexes.py @@ -0,0 +1,23 @@ +from __future__ import unicode_literals + +from optparse import make_option + +from django.core.management.base import AppCommand +from django.core.management.sql import sql_destroy_indexes +from django.db import connections, DEFAULT_DB_ALIAS + +class Command(AppCommand): + help = "Prints the DROP INDEX SQL statements for the given model module name(s)." + + option_list = AppCommand.option_list + ( + make_option('--database', action='store', dest='database', + default=DEFAULT_DB_ALIAS, help='Nominates a database to print the ' + 'SQL for. Defaults to the "default" database.'), + + ) + + output_transaction = True + + def handle_app(self, app, **options): + return '\n'.join(sql_destroy_indexes(app, self.style, connections[options.get('database')])) + diff --git a/django/core/management/sql.py b/django/core/management/sql.py index 66df43e971..ac60ed470c 100644 --- a/django/core/management/sql.py +++ b/django/core/management/sql.py @@ -137,6 +137,13 @@ def sql_indexes(app, style, connection): output.extend(connection.creation.sql_indexes_for_model(model, style)) return output +def sql_destroy_indexes(app, style, connection): + "Returns a list of the DROP INDEX SQL statements for all models in the given app." + output = [] + for model in models.get_models(app): + output.extend(connection.creation.sql_destroy_indexes_for_model(model, style)) + return output + def sql_all(app, style, connection): "Returns a list of CREATE TABLE SQL, initial-data inserts, and CREATE INDEX SQL for the given module." diff --git a/django/db/backends/creation.py b/django/db/backends/creation.py index 89ff1170dc..77c9e6c9e6 100644 --- a/django/db/backends/creation.py +++ b/django/db/backends/creation.py @@ -259,6 +259,52 @@ class BaseDatabaseCreation(object): del references_to_delete[model] return output + def sql_destroy_indexes_for_model(self, model, style): + """ + Returns the DROP INDEX SQL statements for a single model. + """ + if not model._meta.managed or model._meta.proxy or model._meta.swapped: + return [] + output = [] + for f in model._meta.local_fields: + output.extend(self.sql_destroy_indexes_for_field(model, f, style)) + for fs in model._meta.index_together: + fields = [model._meta.get_field_by_name(f)[0] for f in fs] + output.extend(self.sql_destroy_indexes_for_fields(model, fields, style)) + return output + + def sql_destroy_indexes_for_field(self, model, f, style): + """ + Return the DROP INDEX SQL statements for a single model field. + """ + if f.db_index and not f.unique: + return self.sql_destroy_indexes_for_fields(model, [f], style) + else: + return [] + + def sql_destroy_indexes_for_fields(self, model, fields, style): + if len(fields) == 1 and fields[0].db_tablespace: + tablespace_sql = self.connection.ops.tablespace_sql(fields[0].db_tablespace) + elif model._meta.db_tablespace: + tablespace_sql = self.connection.ops.tablespace_sql(model._meta.db_tablespace) + else: + tablespace_sql = "" + if tablespace_sql: + tablespace_sql = " " + tablespace_sql + + field_names = [] + qn = self.connection.ops.quote_name + for f in fields: + field_names.append(style.SQL_FIELD(qn(f.column))) + + index_name = "%s_%s" % (model._meta.db_table, self._digest([f.name for f in fields])) + + return [ + style.SQL_KEYWORD("DROP INDEX") + " " + + style.SQL_TABLE(qn(truncate_name(index_name, self.connection.ops.max_name_length()))) + " " + + ";", + ] + def create_test_db(self, verbosity=1, autoclobber=False): """ Creates a test database, prompting the user for confirmation if the diff --git a/django/db/backends/mysql/creation.py b/django/db/backends/mysql/creation.py index 8d72d11921..01efe8d35b 100644 --- a/django/db/backends/mysql/creation.py +++ b/django/db/backends/mysql/creation.py @@ -41,3 +41,29 @@ class DatabaseCreation(BaseDatabaseCreation): def sql_for_inline_foreign_key_references(self, model, field, known_models, style): "All inline references are pending under MySQL" return [], True + + def sql_destroy_indexes_for_fields(self, model, fields, style): + if len(fields) == 1 and fields[0].db_tablespace: + tablespace_sql = self.connection.ops.tablespace_sql(fields[0].db_tablespace) + elif model._meta.db_tablespace: + tablespace_sql = self.connection.ops.tablespace_sql(model._meta.db_tablespace) + else: + tablespace_sql = "" + if tablespace_sql: + tablespace_sql = " " + tablespace_sql + + field_names = [] + qn = self.connection.ops.quote_name + for f in fields: + field_names.append(style.SQL_FIELD(qn(f.column))) + + index_name = "%s_%s" % (model._meta.db_table, self._digest([f.name for f in fields])) + + from ..util import truncate_name + + return [ + style.SQL_KEYWORD("DROP INDEX") + " " + + style.SQL_TABLE(qn(truncate_name(index_name, self.connection.ops.max_name_length()))) + " " + + style.SQL_KEYWORD("ON") + " " + + style.SQL_TABLE(qn(model._meta.db_table)) + ";", + ] diff --git a/tests/regressiontests/bash_completion/tests.py b/tests/regressiontests/bash_completion/tests.py index ed8cedf1ab..4fdb793feb 100644 --- a/tests/regressiontests/bash_completion/tests.py +++ b/tests/regressiontests/bash_completion/tests.py @@ -66,7 +66,7 @@ class BashCompletionTests(unittest.TestCase): "Subcommands can be autocompleted" self._user_input('django-admin.py sql') output = self._run_autocomplete() - self.assertEqual(output, ['sql sqlall sqlclear sqlcustom sqlflush sqlindexes sqlinitialdata sqlsequencereset']) + self.assertEqual(output, ['sql sqlall sqlclear sqlcustom sqldropindexes sqlflush sqlindexes sqlinitialdata sqlsequencereset']) def test_help(self): "No errors, just an empty list if there are no autocomplete options" diff --git a/tests/regressiontests/commands_sql/tests.py b/tests/regressiontests/commands_sql/tests.py index 723e5cc3f7..949032ae6f 100644 --- a/tests/regressiontests/commands_sql/tests.py +++ b/tests/regressiontests/commands_sql/tests.py @@ -2,7 +2,7 @@ from __future__ import unicode_literals from django.core.management.color import no_style from django.core.management.sql import (sql_create, sql_delete, sql_indexes, - sql_all) + sql_destroy_indexes, sql_all) from django.db import connections, DEFAULT_DB_ALIAS, models from django.test import TestCase from django.utils import six @@ -36,6 +36,13 @@ class SQLCommandsTestCase(TestCase): self.assertIn(len(output), [1, 2]) self.assertTrue(output[0].startswith("CREATE INDEX")) + def test_sql_destroy_indexes(self): + app = models.get_app('commands_sql') + output = sql_destroy_indexes(app, no_style(), connections[DEFAULT_DB_ALIAS]) + # PostgreSQL creates two indexes + self.assertIn(len(output), [1, 2]) + self.assertTrue(output[0].startswith("DROP INDEX")) + def test_sql_all(self): app = models.get_app('commands_sql') output = sql_all(app, no_style(), connections[DEFAULT_DB_ALIAS])