=?utf-8?B?5aec5qKm5rSL?= <minesunny@icloud.com> writes:
> I find the time type accuracy of the database. Using PreparedStatement, the accuracy found out for the sixth time
isdifferent from the first five times. This number is exactly the same as the threshold of the PreparedStatement. I can
understandthat the database can optimize PreparedStatements and reduce repeated parsing and other unnecessary
operations.but I don’t quite understand how such processing will affect the execution results(Or maybe I don’t have a
deepunderstanding of PreparedStatement.).
If you're using JDBC, this is probably the same effect discussed at
https://www.postgresql.org/message-id/flat/CAKyg5Sj%3D85niw8%3DZhX-quHaCQTPhG40REi1s%2BHYF6Snz4Dfi7Q%40mail.gmail.com
It's got something to do with retrieving the query results in binary
mode instead of text. The query result at the server is the same,
but the JDBC driver is rendering it differently.
regards, tom lane