在连续执行存储过程，并且存储过程有返回查询结果时，报错2014 Commands out of sync; you can‘t run this command now；
参考https://blog.csdn.net/ice4026/article/details/37592715
需要使用cursor.nextset()，或者断开connect；
在mysqlclient中的cursor.callproc方法中有一段注释：
Compatibility warning: The act of calling a stored procedure
itself creates an empty result set. This appears after any
result sets generated by the procedure. This is non-standard
behavior with respect to the DB-API. Be sure to use nextset()
to advance through all result sets; otherwise you may get
disconnected.
使用mysqlclient执行存储过程报错2014 Commands out of sync; you can't run this command now
原文：https://www.cnblogs.com/shouwangrenjian/p/12505799.html
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