Fix DATETIMEOFFSET formatting to preserve fractional seconds.

Fixes: #5045

diff --git a/lib/sqlalchemy/dialects/mssql/pyodbc.py b/lib/sqlalchemy/dialects/mssql/pyodbc.py
index 9ce6861c06a48a429a5cfeae5d2e1ca6ec01d9ce..c3304a70559cffb64aa241e8dbea1c2a6bca842e 100644 (file)
--- a/lib/sqlalchemy/dialects/mssql/pyodbc.py
+++ b/lib/sqlalchemy/dialects/mssql/pyodbc.py
@@ -235,9 +235,9 @@ class _ODBCDateTimeOffset(DATETIMEOFFSET):
     def bind_processor(self, dialect):
         def process(value):
             """Convert to string format required by T-SQL."""
-            dto_string = value.strftime("%Y-%m-%d %H:%M:%S %z")
+            dto_string = value.strftime("%Y-%m-%d %H:%M:%S.%f %z")
             # offset needs a colon, e.g., -0700 -> -07:00
-            return dto_string[:23] + ":" + dto_string[23:]
+            return dto_string[:30] + ":" + dto_string[30:]
 
         return process
 

diff --git a/test/dialect/mssql/test_types.py b/test/dialect/mssql/test_types.py
index f837d3add0a27f8ed6d958a573740ded5a4ca85c..3cf9d9036dd91bd1e14a9f03ff713ae2fc679ac1 100644 (file)
--- a/test/dialect/mssql/test_types.py
+++ b/test/dialect/mssql/test_types.py
@@ -735,7 +735,7 @@ class TypeRoundTripTest(
             11,
             2,
             32,
-            0,
+            123456,
             util.timezone(datetime.timedelta(hours=1)),
         )
         t.insert().execute(