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SQL: datetime writing: add tests + issue with pymysql #7082

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May 11, 2014
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SQL: datetime writing: add tests + issue with pymysql #7082

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29 changes: 26 additions & 3 deletions pandas/io/tests/test_sql.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,9 +29,9 @@
from datetime import datetime

from pandas import DataFrame, Series, Index, MultiIndex, isnull
from pandas import to_timedelta
from pandas import date_range, to_datetime, to_timedelta
import pandas.compat as compat
from pandas.compat import StringIO, range, lrange
from pandas.compat import StringIO, range, lrange, string_types
from pandas.core.datetools import format as date_format

import pandas.io.sql as sql
Expand Down Expand Up @@ -870,6 +870,29 @@ def test_date_parsing(self):
self.assertTrue(issubclass(df.IntDateCol.dtype.type, np.datetime64),
"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)

# with read_table -> type information from schema used
result = sql.read_sql_table('test_datetime', self.conn)
result = result.drop('index', axis=1)
tm.assert_frame_equal(result, df)

# with read_sql -> no type information -> sqlite has no native
result = sql.read_sql_query('SELECT * FROM test_datetime', self.conn)
result = result.drop('index', axis=1)
if self.flavor == 'sqlite':
self.assertTrue(isinstance(result.loc[0, 'A'], string_types))
result['A'] = to_datetime(result['A'])
tm.assert_frame_equal(result, df)
else:
tm.assert_frame_equal(result, df)

def test_mixed_dtype_insert(self):
# see GH6509
s1 = Series(2**25 + 1,dtype=np.int32)
Expand All @@ -895,7 +918,7 @@ def connect(self):

def setup_driver(self):
# sqlite3 is built-in
pass
self.driver = None

def tearDown(self):
# in memory so tables should not be removed explicitly
Expand Down