read 插件不支持 persql和postsql吗

eg. 取数据前，对源库上table更改状态字段值，做完同步后，再改状态值。
如下步骤：
1. update @table set status=1 where status=0 --源表
2.执行select * from @table where status=1 -- insert目的表
3.update @table set status=2 where status=1 --postsql 源表

No file, test, or entry point is named. Start by reviewing the read plugin's handling of the three SQL steps in the issue: pre-update, SELECT for synchronization, and post-update. Done means the plugin either supports this sequence for the requested databases or the limitation and supported behavior are documented.

Written by the indexing model from the issue text.