From c13dd65d28cdae132574030ade581a96e49a6c50 Mon Sep 17 00:00:00 2001
From: David Sanders <>
Date: Mon, 1 Apr 2024 22:13:51 +1100
Subject: [PATCH] Update reset sequence sql to allow restarting sequences

---
 django/db/backends/oracle/operations.py | 35 +++++++++++--------------
 1 file changed, 16 insertions(+), 19 deletions(-)

diff --git a/django/db/backends/oracle/operations.py b/django/db/backends/oracle/operations.py
index 15edb292b8..e4838f3a2f 100644
--- a/django/db/backends/oracle/operations.py
+++ b/django/db/backends/oracle/operations.py
@@ -38,25 +38,24 @@ class DatabaseOperations(BaseDatabaseOperations):
     # TODO: colorize this SQL code with style.SQL_KEYWORD(), etc.
     _sequence_reset_sql = """
 DECLARE
-    table_value integer;
-    seq_value integer;
-    seq_name user_tab_identity_cols.sequence_name%%TYPE;
+    identity_col_found integer;
+    new_start integer;
 BEGIN
-    BEGIN
-        SELECT sequence_name INTO seq_name FROM user_tab_identity_cols
-        WHERE  table_name = '%(table_name)s' AND
-               column_name = '%(column_name)s';
-        EXCEPTION WHEN NO_DATA_FOUND THEN
-            seq_name := '%(no_autofield_sequence_name)s';
-    END;
+    SELECT COUNT(*) INTO identity_col_found FROM user_tab_identity_cols
+    WHERE  table_name = '%(table_name)s' AND
+           column_name = '%(column_name)s';
 
-    SELECT NVL(MAX(%(column)s), 0) INTO table_value FROM %(table)s;
-    SELECT NVL(last_number - cache_size, 0) INTO seq_value FROM user_sequences
-           WHERE sequence_name = seq_name;
-    WHILE table_value > seq_value LOOP
-        EXECUTE IMMEDIATE 'SELECT "'||seq_name||'".nextval%(suffix)s'
-        INTO seq_value;
-    END LOOP;
+    IF identity_col_found >= 1 THEN
+        EXECUTE IMMEDIATE 'ALTER TABLE %(table)s ' ||
+                          'MODIFY %(column)s ' ||
+                          'GENERATED BY DEFAULT ON NULL AS IDENTITY ' ||
+                          'START WITH LIMIT VALUE';
+    ELSE
+        SELECT NVL(MAX(%(column)s), 0) + 1 INTO new_start FROM %(table)s;
+        EXECUTE IMMEDIATE 'ALTER SEQUENCE "%(no_autofield_sequence_name)s" ' ||
+                          'RESTART START WITH ' || new_start;
+
+    END IF;
 END;
 /"""
 
@@ -537,7 +536,6 @@ END;
                 "column": column,
                 "table_name": strip_quotes(table),
                 "column_name": strip_quotes(column),
-                "suffix": self.connection.features.bare_select_suffix,
             }
             sql.append(query)
         return sql
@@ -561,7 +559,6 @@ END;
                             "column": column,
                             "table_name": strip_quotes(table),
                             "column_name": strip_quotes(column),
-                            "suffix": self.connection.features.bare_select_suffix,
                         }
                     )
                     # Only one AutoField is allowed per model, so don't