magic-removal: Fixed #1219 - Added bulk delete for objects.
git-svn-id: http://code.djangoproject.com/svn/django/branches/magic-removal@2029 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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@ -48,7 +48,7 @@ class Manager(object):
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self.creation_counter < klass._default_manager.creation_counter:
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klass._default_manager = self
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def _get_sql_clause(self, *args, **kwargs):
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def _get_sql_clause(self, allow_joins, *args, **kwargs):
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def quote_only_if_word(word):
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if ' ' in word:
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return word
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@ -63,7 +63,7 @@ class Manager(object):
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joins = SortedDict()
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where = kwargs.get('where') and kwargs['where'][:] or []
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params = kwargs.get('params') and kwargs['params'][:] or []
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# Convert all the args into SQL.
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table_count = 0
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for arg in args:
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@ -77,7 +77,6 @@ class Manager(object):
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where.extend(where2)
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params.extend(params2)
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# Convert the kwargs into SQL.
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tables2, joins2, where2, params2 = parse_lookup(kwargs.items(), opts)
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tables.extend(tables2)
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@ -99,10 +98,14 @@ class Manager(object):
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# Start composing the body of the SQL statement.
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sql = [" FROM", backend.quote_name(opts.db_table)]
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# Check if extra tables are allowed. If not, throw an error
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if (tables or joins) and not allow_joins:
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raise TypeError("Joins are not allowed in this type of query")
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# Compose the join dictionary into SQL describing the joins.
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if joins:
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sql.append(" ".join(["%s %s AS %s ON %s" % (join_type, table, alias, condition)
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for (alias, (table, join_type, condition)) in joins.items()]))
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for (alias, (table, join_type, condition)) in joins.items()]))
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# Compose the tables clause into SQL.
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if tables:
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@ -146,13 +149,28 @@ class Manager(object):
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return select, " ".join(sql), params
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def delete(self, *args, **kwargs):
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# disable non-supported fields
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kwargs['select_related'] = False
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kwargs['select'] = {}
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kwargs['order_by'] = []
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kwargs['offset'] = None
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kwargs['limit'] = None
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opts = self.klass._meta
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# Perform the SQL delete
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cursor = connection.cursor()
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_, sql, params = self._get_sql_clause(False, *args, **kwargs)
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cursor.execute("DELETE " + sql, params)
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def get_iterator(self, *args, **kwargs):
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# kwargs['select'] is a dictionary, and dictionaries' key order is
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# undefined, so we convert it to a list of tuples internally.
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kwargs['select'] = kwargs.get('select', {}).items()
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cursor = connection.cursor()
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select, sql, params = self._get_sql_clause(*args, **kwargs)
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select, sql, params = self._get_sql_clause(True, *args, **kwargs)
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cursor.execute("SELECT " + (kwargs.get('distinct') and "DISTINCT " or "") + ",".join(select) + sql, params)
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fill_cache = kwargs.get('select_related')
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index_end = len(self.klass._meta.fields)
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@ -177,7 +195,7 @@ class Manager(object):
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kwargs['offset'] = None
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kwargs['limit'] = None
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kwargs['select_related'] = False
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_, sql, params = self._get_sql_clause(*args, **kwargs)
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_, sql, params = self._get_sql_clause(True, *args, **kwargs)
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cursor = connection.cursor()
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cursor.execute("SELECT COUNT(*)" + sql, params)
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return cursor.fetchone()[0]
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@ -209,7 +227,7 @@ class Manager(object):
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fields = [f.column for f in self.klass._meta.fields]
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cursor = connection.cursor()
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_, sql, params = self._get_sql_clause(*args, **kwargs)
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_, sql, params = self._get_sql_clause(True, *args, **kwargs)
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select = ['%s.%s' % (backend.quote_name(self.klass._meta.db_table), backend.quote_name(f)) for f in fields]
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cursor.execute("SELECT " + (kwargs.get('distinct') and "DISTINCT " or "") + ",".join(select) + sql, params)
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while 1:
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@ -239,7 +257,7 @@ class Manager(object):
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if field.null:
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kwargs.setdefault('where', []).append('%s.%s IS NOT NULL' % \
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(backend.quote_name(self.klass._meta.db_table), backend.quote_name(field.column)))
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select, sql, params = self._get_sql_clause(*args, **kwargs)
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select, sql, params = self._get_sql_clause(True, *args, **kwargs)
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sql = 'SELECT %s %s GROUP BY 1 ORDER BY 1 %s' % \
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(backend.get_date_trunc_sql(kind, '%s.%s' % (backend.quote_name(self.klass._meta.db_table),
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backend.quote_name(field.column))), sql, order)
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@ -203,6 +203,13 @@ Traceback (most recent call last):
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...
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AttributeError: Manager isn't accessible via Article instances
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# Bulk delete test: How many objects before and after the delete?
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>>> Article.objects.get_count()
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8L
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>>> Article.objects.delete(id__lte=4)
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>>> Article.objects.get_count()
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4L
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"""
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from django.conf import settings
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@ -83,7 +83,7 @@ This is a test
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[This is a test, John's second story]
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# The underlying query only makes one join when a related table is referenced twice.
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>>> null, sql, null = Article.objects._get_sql_clause(reporter__first_name__exact='John', reporter__last_name__exact='Smith')
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>>> null, sql, null = Article.objects._get_sql_clause(True, reporter__first_name__exact='John', reporter__last_name__exact='Smith')
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>>> sql.count('INNER JOIN')
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1
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@ -152,4 +152,9 @@ John Smith
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>>> Reporter.objects.get_list(articles__reporter__first_name__startswith='John', distinct=True)
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[John Smith]
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# Delete requiring join is prohibited
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>>> Article.objects.delete(reporter__first_name__startswith='Jo')
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Traceback (most recent call last):
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...
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TypeError: Joins are not allowed in this type of query
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"""
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