MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
If you get Commands out of sync; you can't run this
command now
in your client code, you are calling
client functions in the wrong order.
This can happen, for example, if you are using
mysql_use_result()
and try to
execute a new query before you have called
mysql_free_result()
. It can
also happen if you try to execute two queries that return data
without calling
mysql_use_result()
or
mysql_store_result()
in
between.