Fixed #23152 -- Added support for transactional Spatialite metadata initialization.

Thanks Doug Goldstein for the initial patch.

django/contrib/gis/db/backends/spatialite/base.py

@@ -13,6 +13,7 @@ from django.contrib.gis.db.backends.spatialite.introspection import SpatiaLiteIn
 from django.contrib.gis.db.backends.spatialite.operations import SpatiaLiteOperations
 from django.contrib.gis.db.backends.spatialite.schema import SpatialiteSchemaEditor
 from django.utils import six
+from django.utils.functional import cached_property
 
 
 class DatabaseFeatures(BaseSpatialFeatures, SQLiteDatabaseFeatures):
@@ -20,6 +21,13 @@ class DatabaseFeatures(BaseSpatialFeatures, SQLiteDatabaseFeatures):
     # SpatiaLite can only count vertices in LineStrings
     supports_num_points_poly = False
 
+    @cached_property
+    def supports_initspatialmetadata_with_transactions(self):
+        # SpatiaLite 4.1+ support initializing all metadata in one transaction
+        # which can result in a significant performance improvement when
+        # creating the database.
+        return self.connection.ops.spatial_version >= (4, 1, 0)
+
 
 class DatabaseWrapper(SQLiteDatabaseWrapper):
     SchemaEditorClass = SpatialiteSchemaEditor

django/contrib/gis/db/backends/spatialite/creation.py

@@ -36,4 +36,5 @@ class SpatiaLiteCreation(DatabaseCreation):
         Creates the spatial metadata tables.
         """
         cur = self.connection._cursor()
-        cur.execute("SELECT InitSpatialMetaData()")
+        arg = "1" if self.connection.features.supports_initspatialmetadata_with_transactions else ""
+        cur.execute("SELECT InitSpatialMetaData(%s)" % arg)

docs/releases/1.7.2.txt

@@ -34,3 +34,6 @@ Bugfixes
   ``AlterIndexTogether`` or ``AlterUniqueTogether`` (:ticket:`23614`).
 
 * Updated the first day of the week in the Ukrainian locale to Monday.
+
+* Added support for transactional spatial metadata initialization on
+  SpatiaLite 4.1+ (:ticket:`23152`).