Add package docs for pgxpool

Author: jackc

pgxpool/doc.go

@@ -0,0 +1,25 @@
+// Package pgxpool is a connection pool for pgx.
+/*
+pgxpool implements a nearly identical interface to pgx connections.
+
+Establishing a Connection
+
+The primary way of establishing a connection is with `pgxpool.Connect`.
+
+    pool, err := pgxpool.Connect(context.Background(), os.Getenv("DATABASE_URL"))
+
+The database connection string can be in URL or DSN format. PostgreSQL settings, pgx settings, and pool settings can be
+specified here. In addition, a config struct can be created by `ParseConfig` and modified before establishing the
+connection with `ConnectConfig`.
+
+    config, err := pgxpool.ParseConfig(os.Getenv("DATABASE_URL"))
+    if err != nil {
+        // ...
+    }
+    config.AfterConnect = func(ctx context.Context, conn *pgx.Conn) error {
+        // do something with every new connection
+    }
+
+    pool, err := pgxpool.ConnectConfig(context.Background(), config)
+*/
+package pgxpool