python插入数据到mysql时报错：mysql_exceptions.OperationalError: 1366 Incorrect string value

mysql_exceptions.OperationalError: (1366, "Incorrect string value: 'xE4xB8 ......' for column 'pageSnapshot' at row 1")的异常
  File "E:/outofmemory/svn/web/models/minipage/__init__.py", line 356, in addPageVersion
    newVersionId = db.insert(self.table_src_page_version,**pageVersion)
  File "C:Python27libsite-packagesweb.py-0.36-py2.7.eggwebdb.py", line 774, in insert
    self._db_execute(db_cursor, q1)
  File "C:Python27libsite-packagesweb.py-0.36-py2.7.eggwebdb.py", line 587, in _db_execute
    out = cur.execute(query, params)
  File "C:Python27libsite-packagesMySQLdbcursors.py", line 174, in execute
    self.errorhandler(self, exc, value)
  File "C:Python27libsite-packagesMySQLdbconnections.py", line 36, in defaulterrorhandler
    raise errorclass, errorvalue
_mysql_exceptions.OperationalError: (1366, "Incorrect string value: 'xE4xB8 ......' for column 'pageSnapshot' at row 1")