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BUG: to_sql convert index name to string (#15404) #15423

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Merged
merged 4 commits into from
Feb 17, 2017
Merged

BUG: to_sql convert index name to string (#15404) #15423

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73d20c0
Converted index name to string to fix issue #15404 - BUG: to_sql erro…
redbullpeter Feb 16, 2017
ee53748
Additional int to string conversion added. Associated test cases added.
redbullpeter Feb 16, 2017
2f4fbba
PEP 8 compliance edits
redbullpeter Feb 16, 2017
e9a4f3a
Removed extraneous brackets
redbullpeter Feb 16, 2017
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5 changes: 3 additions & 2 deletions pandas/io/sql.py
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Original file line number Diff line number Diff line change
Expand Up @@ -750,7 +750,8 @@ def _get_column_names_and_types(self, dtype_mapper):
for i, idx_label in enumerate(self.index):
idx_type = dtype_mapper(
self.frame.index.get_level_values(i))
column_names_and_types.append((idx_label, idx_type, True))
column_names_and_types.append(((text_type(idx_label)),
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minor issue, but I think you have here one pair of brackets that is not needed

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Three lines further down the same kind of type_text conversion was done with a set of extra brackets. I just copied the style for consistency.

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then you can remove it in both places. This is just redundant in python syntax, and not enhancing readability IMO (which could be a reason to have redundant chars)

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Removed it from my changes. Left the other one alone as on closer inspection the brackets were not extraneous after all, the line breaks just made it hard to see the pairing.

idx_type, True))

column_names_and_types += [
(text_type(self.frame.columns[i]),
Expand Down Expand Up @@ -1220,7 +1221,7 @@ def _create_sql_schema(self, frame, table_name, keys=None, dtype=None):

def _get_unicode_name(name):
try:
uname = name.encode("utf-8", "strict").decode("utf-8")
uname = text_type(name).encode("utf-8", "strict").decode("utf-8")
except UnicodeError:
raise ValueError("Cannot convert identifier to UTF-8: '%s'" % name)
return uname
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15 changes: 15 additions & 0 deletions pandas/tests/io/test_sql.py
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Expand Up @@ -709,6 +709,21 @@ def test_to_sql_index_label(self):
self.assertEqual(frame.columns[0], 'other_label',
"Specified index_label not written to database")

# index name is integer
temp_frame.index.name = 0
sql.to_sql(temp_frame, 'test_index_label', self.conn,
if_exists='replace')
frame = sql.read_sql_query('SELECT * FROM test_index_label', self.conn)
self.assertEqual(frame.columns[0], '0',
"Integer index label not written to database")

temp_frame.index.name = None
sql.to_sql(temp_frame, 'test_index_label', self.conn,
if_exists='replace', index_label=0)
frame = sql.read_sql_query('SELECT * FROM test_index_label', self.conn)
self.assertEqual(frame.columns[0], '0',
"Integer index label not written to database")

def test_to_sql_index_label_multiindex(self):
temp_frame = DataFrame({'col1': range(4)},
index=MultiIndex.from_product(
Expand Down