ENH: sql support for Timestamp (GH7103)

doc/source/v0.15.0.txt

@@ -441,6 +441,8 @@ Enhancements
    df.to_sql('table', engine, schema='other_schema')
    pd.read_sql_table('table', engine, schema='other_schema')
 
+- Added support for writing datetime64 columns with ``to_sql`` for all database flavors (:issue:`7103`).
+
 - Added support for bool, uint8, uint16 and uint32 datatypes in ``to_stata`` (:issue:`7097`, :issue:`7365`)
 
 - Added ``layout`` keyword to ``DataFrame.plot`` (:issue:`6667`)

pandas/io/sql.py

@@ -540,6 +540,23 @@ def pandasSQL_builder(con, flavor=None, schema=None, meta=None, is_cursor=False)
         return PandasSQLLegacy(con, flavor, is_cursor=is_cursor)
 
 
+try:
+    import sqlalchemy.types as types
+
+    class Timestamp(types.TypeDecorator):
+        """convert from pandas.tslib.Timestamp type """
+
+        impl = types.DateTime
+
+        def process_bind_param(self, value, dialect):
+            f = getattr(value,'to_datetime', None)
+            if f is not None:
+                return f()
+            return value
+except:
+    pass
+
+
 class PandasSQLTable(PandasObject):
     """
     For mapping Pandas tables to SQL tables.
@@ -784,7 +801,7 @@ def _sqlalchemy_type(self, col):
                 tz = col.tzinfo
                 return DateTime(timezone=True)
             except:
-                return DateTime
+                return Timestamp
         if com.is_timedelta64_dtype(col):
             warnings.warn("the 'timedelta' type is not supported, and will be "
                           "written as integer values (ns frequency) to the "

pandas/io/tests/test_sql.py

@@ -925,9 +925,6 @@ def test_date_parsing(self):
                         "IntDateCol loaded with incorrect type")
 
     def test_datetime(self):
-        if self.driver == 'pymysql':
-             raise nose.SkipTest('writing datetime not working with pymysql')
-
         df = DataFrame({'A': date_range('2013-01-01 09:00:00', periods=3),
                         'B': np.arange(3.0)})
         df.to_sql('test_datetime', self.conn)