[1.5.x] Fixed #19058 -- Fixed Oracle GIS crash

The problem is the same as in #10888 which was reintroduced when
bulk_insert was added. Thanks to Jani Tiainen for report, patch and
also testing the final patch on Oracle GIS.

Backpatch of 92d7f541da

django/contrib/gis/db/backends/oracle/compiler.py

@@ -7,29 +7,7 @@ class GeoSQLCompiler(BaseGeoSQLCompiler, SQLCompiler):
     pass
 
 class SQLInsertCompiler(compiler.SQLInsertCompiler, GeoSQLCompiler):
-    def placeholder(self, field, val):
-        if field is None:
-            # A field value of None means the value is raw.
-            return val
-        elif hasattr(field, 'get_placeholder'):
-            # Some fields (e.g. geo fields) need special munging before
-            # they can be inserted.
-            ph = field.get_placeholder(val, self.connection)
-            if ph == 'NULL':
-                # If the placeholder returned is 'NULL', then we need to
-                # to remove None from the Query parameters. Specifically,
-                # cx_Oracle will assume a CHAR type when a placeholder ('%s')
-                # is used for columns of MDSYS.SDO_GEOMETRY.  Thus, we use
-                # 'NULL' for the value, and remove None from the query params.
-                # See also #10888.
-                param_idx = self.query.columns.index(field.column)
-                params = list(self.query.params)
-                params.pop(param_idx)
-                self.query.params = tuple(params)
-            return ph
-        else:
-            # Return the common case for the placeholder
-            return '%s'
+    pass
 
 class SQLDeleteCompiler(compiler.SQLDeleteCompiler, GeoSQLCompiler):
     pass

django/contrib/gis/db/backends/oracle/operations.py

@@ -288,3 +288,12 @@ class OracleOperations(DatabaseOperations, BaseSpatialOperations):
     def spatial_ref_sys(self):
         from django.contrib.gis.db.backends.oracle.models import SpatialRefSys
         return SpatialRefSys
+    
+    def modify_insert_params(self, placeholders, params):
+        """Drop out insert parameters for NULL placeholder. Needed for Oracle Spatial
+        backend due to #10888
+        """
+        # This code doesn't work for bulk insert cases.
+        assert len(placeholders) == 1
+        return [[param for pholder,param
+                 in six.moves.zip(placeholders[0], params[0]) if pholder != 'NULL'], ]

django/db/backends/__init__.py

@@ -916,6 +916,11 @@ class BaseDatabaseOperations(object):
         conn = ' %s ' % connector
         return conn.join(sub_expressions)
 
+    def modify_insert_params(self, placeholders, params):
+        """Allow modification of insert parameters. Needed for Oracle Spatial
+        backend due to #10888.
+        """
+        return params
 
 class BaseDatabaseIntrospection(object):
     """

django/db/models/sql/compiler.py

@@ -905,6 +905,8 @@ class SQLInsertCompiler(SQLCompiler):
                 [self.placeholder(field, v) for field, v in zip(fields, val)]
                 for val in values
             ]
+            # Oracle Spatial needs to remove some values due to #10888
+            params = self.connection.ops.modify_insert_params(placeholders, params)
         if self.return_id and self.connection.features.can_return_id_from_insert:
             params = params[0]
             col = "%s.%s" % (qn(opts.db_table), qn(opts.pk.column))