drop extra example

Signed-off-by: Artemiy Ryabinkov <getlag@ya.ru>

conn.go

@@ -471,7 +471,7 @@ func connect(config ConnConfig, connInfo *pgtype.ConnInfo) (c *Conn, err error)
 		errmsgs[i] = err.Error()
 	}
 
-	return nil, errors.New(strings.Join(errmsgs, ";"))
+	return nil, errors.New(strings.Join(errmsgs, "; "))
 }
 
 func (c *Conn) checkWritable() error {

examples/multihosts/README.md

@@ -1,25 +0,0 @@
-# Description
-
-This is a sample chat program implemented using PostgreSQL's listen/notify
-functionality with pgx.
-
-Start multiple instances of this program connected to the same database to chat
-between them.
-
-## Connection configuration
-
-The database connection is configured via the standard PostgreSQL environment variables.
-
-* PGHOST - defaults to localhost
-* PGUSER - defaults to current OS user
-* PGPASSWORD - defaults to empty string
-* PGDATABASE - defaults to user name
-
-You can either export them then run chat:
-
-    export PGHOST=/private/tmp
-    ./chat
-
-Or you can prefix the chat execution with the environment variables:
-
-    PGHOST=/private/tmp ./chat

examples/multihosts/main.go

@@ -1,74 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"context"
-	"fmt"
-	"os"
-
-	"github.com/jackc/pgx"
-)
-
-var pool *pgx.ConnPool
-
-func main() {
-	config, err := pgx.ParseEnvLibpq()
-	if err != nil {
-		fmt.Fprintln(os.Stderr, "Unable to parse environment:", err)
-		os.Exit(1)
-	}
-
-	pool, err = pgx.NewConnPool(pgx.ConnPoolConfig{ConnConfig: config})
-	if err != nil {
-		fmt.Fprintln(os.Stderr, "Unable to connect to database:", err)
-		os.Exit(1)
-	}
-
-	go listen()
-
-	fmt.Println(`Type a message and press enter.
-
-This message should appear in any other chat instances connected to the same
-database.
-
-Type "exit" to quit.`)
-
-	scanner := bufio.NewScanner(os.Stdin)
-	for scanner.Scan() {
-		msg := scanner.Text()
-		if msg == "exit" {
-			os.Exit(0)
-		}
-
-		_, err = pool.Exec("select pg_notify('chat', $1)", msg)
-		if err != nil {
-			fmt.Fprintln(os.Stderr, "Error sending notification:", err)
-			os.Exit(1)
-		}
-	}
-	if err := scanner.Err(); err != nil {
-		fmt.Fprintln(os.Stderr, "Error scanning from stdin:", err)
-		os.Exit(1)
-	}
-}
-
-func listen() {
-	conn, err := pool.Acquire()
-	if err != nil {
-		fmt.Fprintln(os.Stderr, "Error acquiring connection:", err)
-		os.Exit(1)
-	}
-	defer pool.Release(conn)
-
-	conn.Listen("chat")
-
-	for {
-		notification, err := conn.WaitForNotification(context.Background())
-		if err != nil {
-			fmt.Fprintln(os.Stderr, "Error waiting for notification:", err)
-			os.Exit(1)
-		}
-
-		fmt.Println("PID:", notification.PID, "Channel:", notification.Channel, "Payload:", notification.Payload)
-	}
-}