database/pqto is an extension package of pq (a pure Go postgres driver for Go's database/sql package).It introduces read and write timeouts in database soruce connection string as follows:

postgres://192.168.15.130:5432/postgres?sslmode=disable&connect_timeout=2&read_timeout=2s&write_timeout=2s

read_timeout: It uses a format similar to Go's Duration to describe the read timeout.
write_timeout: It uses a format similar to Go's Duration to describe the writetimeout.

encoding

encoding provides a fast JSON parsing solution that is different from the one in the standard library.

gmsm

gmsm provides encryption methods compliant with national cryptographic standards.

log

log provides a simple logging wrapper.

time2

time2 providesGo's Duration json format

timeout

timeout provided a connection with read and write timeouts.