1. 实现配置文件解析

2. 实现数据库连接

vendor/github.com/jackc/pgx/v5/pgproto3/doc.go

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+// Package pgproto3 is a encoder and decoder of the PostgreSQL wire protocol version 3.
+//
+// The primary interfaces are Frontend and Backend. They correspond to a client and server respectively. Messages are
+// sent with Send (or a specialized Send variant). Messages are automatically bufferred to minimize small writes. Call
+// Flush to ensure a message has actually been sent.
+//
+// The Trace method of Frontend and Backend can be used to examine the wire-level message traffic. It outputs in a
+// similar format to the PQtrace function in libpq.
+//
+// See https://www.postgresql.org/docs/current/protocol-message-formats.html for meanings of the different messages.
+package pgproto3