From b94650d45466ba2409ed3da872d067fcb9dad85a Mon Sep 17 00:00:00 2001
From: duozhang <duozhang@vmware.com>
Date: Thu, 11 Jul 2013 15:25:42 +0800
Subject: [PATCH] convert nan to None before insert data into mysql

---
 pandas/io/sql.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pandas/io/sql.py b/pandas/io/sql.py
index 11b139b620175..f413cb95afa76 100644
--- a/pandas/io/sql.py
+++ b/pandas/io/sql.py
@@ -9,6 +9,7 @@
 
 from pandas.core.datetools import format as date_format
 from pandas.core.api import DataFrame, isnull
+from pandas import notnull
 
 #------------------------------------------------------------------------------
 # Helper execution function
@@ -244,6 +245,8 @@ def _write_mysql(frame, table, names, cur):
     wildcards = ','.join([r'%s'] * len(names))
     insert_query = "INSERT INTO %s (%s) VALUES (%s)" % (
         table, col_names, wildcards)
+    # convert NaN to None object
+    frame = frame.where(notnull(frame), None)
     data = [tuple(x) for x in frame.values]
     cur.executemany(insert_query, data)