libpq
https://www.postgresql.org/do…
protocol
https://www.postgresql.org/do…
https://zhuanlan.zhihu.com/p/…
set:
https://www.postgresql.org/do…
prepare:
https://www.postgresql.org/do…
prepare-transaction:
https://www.postgresql.org/do…
savepoint:
https://www.postgresql.org/do…