select for update got an error

[576470954]

What happened:
when I write sql "select sth for update" and use QueryContext func.Why I use QueryContext(not ExecContext) because I want to
get the rows:

I got error:

What you expected to happen:
execute normally

How to reproduce it (as minimally and precisely as possible):
sql and func like my code

Anything else we need to know?:
the reason maybe in seata-go, it QueryContext and then ExecContext, so the mysql conn is something wrong
this is the QueryContext code:

and then :after exec the business func (showed upon) in line 178, it exec line:185

and this conn cant use twice(watching in mysql has been set to true, and haven't set to false after queryContext complete)

In mysql driver QueryContext func haven't finish the mc unless err != nil(it's diff with ExecContext func)

[576470954]

I change the code swap the business func and exec in select_for_update_executor.go
and the QueryContext func can use with in an Tx

[marsevilspirit]

assign me please