Module pool 

Structs

CachedStatement

Cached Statement from PoolConnection

Pool

connection pool for a set of connections to database. Can be used as entry point of query

PoolBuilder

builder type for connection pool

PoolConnection

a RAII type for connection. it manages the lifetime of connection and it’s CachedStatement cache. a set of public is exposed to interact with them.

Traits

Connect

trait for how to produce a new Client and push it into connection pool