bpo-24464: Deprecate sqlite3.enable_shared_cache (GH-24008)

2 files changed, 21 insertions, 0 deletions

diff --git a/Lib/sqlite3/dbapi2.py b/Lib/sqlite3/dbapi2.py
index 991682ce9ef..6475f98a646 100644
--- a/Lib/sqlite3/dbapi2.py
+++ b/Lib/sqlite3/dbapi2.py
@@ -84,6 +84,20 @@ def register_adapters_and_converters():
 
 register_adapters_and_converters()
 
+# bpo-24464: enable_shared_cache was deprecated in Python 3.10.  It's
+# scheduled for removal in Python 3.12.
+def enable_shared_cache(enable):
+    from _sqlite3 import enable_shared_cache as _old_enable_shared_cache
+    import warnings
+    msg = (
+        "enable_shared_cache is deprecated and will be removed in Python 3.12. "
+        "Shared cache is strongly discouraged by the SQLite 3 documentation. "
+        "If shared cache must be used, open the database in URI mode using"
+        "the cache=shared query parameter."
+    )
+    warnings.warn(msg, DeprecationWarning, stacklevel=2)
+    return _old_enable_shared_cache
+
 # Clean up namespace
 
 del(register_adapters_and_converters)
diff --git a/Lib/sqlite3/test/dbapi.py b/Lib/sqlite3/test/dbapi.py
index 2b85ef99f02..3131c1ec2ab 100644
--- a/Lib/sqlite3/test/dbapi.py
+++ b/Lib/sqlite3/test/dbapi.py
@@ -83,6 +83,13 @@ class ModuleTests(unittest.TestCase):
                                    sqlite.DatabaseError),
                         "NotSupportedError is not a subclass of DatabaseError")
 
+    def CheckSharedCacheDeprecated(self):
+        for enable in (True, False):
+            with self.assertWarns(DeprecationWarning) as cm:
+                sqlite.enable_shared_cache(enable)
+            self.assertIn("dbapi.py", cm.filename)
+
+
 class ConnectionTests(unittest.TestCase):
 
     def setUp(self):