From 912f72a6f057bb39f63d66c7fcf0eab7bf28c7b5 Mon Sep 17 00:00:00 2001
From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Thu, 14 Mar 2024 05:29:49 +0100
Subject: [PATCH] Refs #35295 -- Added
 BaseDatabaseOperations.bulk_insert_sql().

Co-authored-by: Nick Pope <nick@nickpope.me.uk>
---
 django/db/backends/base/operations.py       | 5 +++++
 django/db/backends/mysql/operations.py      | 5 -----
 django/db/backends/postgresql/operations.py | 5 -----
 django/db/backends/sqlite3/operations.py    | 5 -----
 4 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/django/db/backends/base/operations.py b/django/db/backends/base/operations.py
index 9f40ec5e4f..889e4d87b4 100644
--- a/django/db/backends/base/operations.py
+++ b/django/db/backends/base/operations.py
@@ -276,6 +276,11 @@ class BaseDatabaseOperations:
             if sql
         )
 
+    def bulk_insert_sql(self, fields, placeholder_rows):
+        placeholder_rows_sql = (", ".join(row) for row in placeholder_rows)
+        values_sql = ", ".join([f"({sql})" for sql in placeholder_rows_sql])
+        return f"VALUES {values_sql}"
+
     def last_executed_query(self, cursor, sql, params):
         """
         Return a string of the query last executed by the given cursor, with
diff --git a/django/db/backends/mysql/operations.py b/django/db/backends/mysql/operations.py
index 7fabb0e05e..9741e6a985 100644
--- a/django/db/backends/mysql/operations.py
+++ b/django/db/backends/mysql/operations.py
@@ -290,11 +290,6 @@ class DatabaseOperations(BaseDatabaseOperations):
     def pk_default_value(self):
         return "NULL"
 
-    def bulk_insert_sql(self, fields, placeholder_rows):
-        placeholder_rows_sql = (", ".join(row) for row in placeholder_rows)
-        values_sql = ", ".join("(%s)" % sql for sql in placeholder_rows_sql)
-        return "VALUES " + values_sql
-
     def combine_expression(self, connector, sub_expressions):
         if connector == "^":
             return "POW(%s)" % ",".join(sub_expressions)
diff --git a/django/db/backends/postgresql/operations.py b/django/db/backends/postgresql/operations.py
index 4e444d5f2b..4b179ca83f 100644
--- a/django/db/backends/postgresql/operations.py
+++ b/django/db/backends/postgresql/operations.py
@@ -328,11 +328,6 @@ class DatabaseOperations(BaseDatabaseOperations):
         ]
         return "RETURNING %s" % ", ".join(columns), ()
 
-    def bulk_insert_sql(self, fields, placeholder_rows):
-        placeholder_rows_sql = (", ".join(row) for row in placeholder_rows)
-        values_sql = ", ".join("(%s)" % sql for sql in placeholder_rows_sql)
-        return "VALUES " + values_sql
-
     if is_psycopg3:
 
         def adapt_integerfield_value(self, value, internal_type):
diff --git a/django/db/backends/sqlite3/operations.py b/django/db/backends/sqlite3/operations.py
index 29a5c0391e..0078cc077a 100644
--- a/django/db/backends/sqlite3/operations.py
+++ b/django/db/backends/sqlite3/operations.py
@@ -353,11 +353,6 @@ class DatabaseOperations(BaseDatabaseOperations):
     def convert_booleanfield_value(self, value, expression, connection):
         return bool(value) if value in (1, 0) else value
 
-    def bulk_insert_sql(self, fields, placeholder_rows):
-        placeholder_rows_sql = (", ".join(row) for row in placeholder_rows)
-        values_sql = ", ".join(f"({sql})" for sql in placeholder_rows_sql)
-        return f"VALUES {values_sql}"
-
     def combine_expression(self, connector, sub_expressions):
         # SQLite doesn't have a ^ operator, so use the user-defined POWER
         # function that's registered in connect().