Question

我有一个Python 3.5脚本，可以在Windows上完美运行。现在我在Linux上尝试了它，我收到了以下错误：

TypeError: The first argument to execute must be a string or unicode query.

脚本正在记录SQL查询，因此我发现查询实际上是一个字节（b＆＃39;我的SQL查询＆＃39;）。在Windows上，查询不会转换为字节。在Linux上，确实如此。为什么？我使用参数化SQL查询，如果我使用.decode('utf-8')，我会收到以下错误消息：

AttributeError: 'str' object has no attribute 'decode'

所以我的SQL查询是一个字符串...... 我脚本的主要部分是：

df = pd.read_sql(sql_query, sql_engine)

我使用pandas 0.17.1

谢谢你的帮助！

更新在Linux上，SqlAlchemy日志记录的输出是：

2015-12-03 02:23:44 PM | INFO | b'SELECT 1;'
2015-12-03 02:23:44 PM | INFO | ()
2015-12-03 02:23:44 PM | INFO | ROLLBACK

在Windows上，完全相同的脚本会生成以下SqlAlchemy日志记录：

2015-12-03 02:46:25 PM | INFO | SHOW VARIABLES LIKE 'character_set%%'
2015-12-03 02:46:25 PM | INFO | ()
2015-12-03 02:46:25 PM | INFO | SELECT 1;
2015-12-03 02:46:26 PM | INFO | ()

我的sql_query SQL查询的类型为<class 'str'>

以下是完整的追溯：

Traceback (most recent call last):
  File "<my script file>.py", line <xyz>, in get_df_from_dwh
    df = pd.read_sql(sql_query, sql_engine)
  File "/home/user/anaconda3/lib/python3.5/site-packages/pandas/io/sql.py", line 513, in read_sql
    chunksize=chunksize)
  File "/home/user/anaconda3/lib/python3.5/site-packages/pandas/io/sql.py", line 1181, in read_query
    result = self.execute(*args)
  File "/home/user/anaconda3/lib/python3.5/site-packages/pandas/io/sql.py", line 1072, in execute
    return self.connectable.execute(*args, **kwargs)
  File "/home/user/anaconda3/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1991, in execute
    return connection.execute(statement, *multiparams, **params)
  File "/home/user/anaconda3/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 906, in execute
    return self._execute_text(object, multiparams, params)
  File "/home/user/anaconda3/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1054, in _execute_text
    statement, parameters
  File "/home/user/anaconda3/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1146, in _execute_context
    context)
  File "/home/user/anaconda3/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1344, in _handle_dbapi_exception
    util.reraise(*exc_info)
  File "/home/user/anaconda3/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 182, in reraise
    raise value
  File "/home/user/anaconda3/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1139, in _execute_context
    context)
  File "/home/user/anaconda3/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 450, in do_execute
    cursor.execute(statement, parameters)
TypeError: The first argument to execute must be a string or unicode query.

python 3 pandas read_sql仅在linux上将字符串查询转换为字节

0 个答案: