fix(jans-pycloudlib): set sql_mode while connecting to mysql

jans-pycloudlib/jans/pycloudlib/persistence/sql.py

@@ -19,6 +19,7 @@
 from sqlalchemy import func
 from sqlalchemy import select
 from sqlalchemy import delete
+from sqlalchemy import event
 from ldif import LDIFParser
 from ldap3.utils import dn as dnutils
 
@@ -256,11 +257,19 @@ def __init__(self, manager: Manager, *args: _t.Any, **kwargs: _t.Any) -> None:
 
         self.dialect = self.adapter.dialect
         self._metadata: _t.Optional[MetaData] = None
+        self._engine = None
 
-    @cached_property
+    @property
     def engine(self) -> Engine:
         """Lazy init of engine instance object."""
-        return create_engine(self.engine_url, pool_pre_ping=True, hide_parameters=True)
+        if not self._engine:
+            self._engine = create_engine(self.engine_url, pool_pre_ping=True, hide_parameters=True)
+
+            if self.dialect == "mysql":
+                event.listen(self._engine, "first_connect", set_mysql_strict_mode)
+
+        # initialized engine
+        return self._engine
 
     @property
     def engine_url(self) -> str:
@@ -592,3 +601,9 @@ def render_sql_properties(manager: Manager, src: str, dest: str) -> None:
             "server_time_zone": os.environ.get("CN_SQL_DB_TIMEZONE", "UTC"),
         }
         f.write(rendered_txt)
+
+
+def set_mysql_strict_mode(dbapi_connection, connection_record):
+    cursor = dbapi_connection.cursor()
+    cursor.execute("SET SESSION sql_mode = 'TRADITIONAL'")
+    cursor.close()