Add de redigo demo and update link

de/05.6.md

@@ -10,10 +10,90 @@ redis is a key-value storage system like Memcached, that supports the string, li
 
 There are some Go database drivers for redis:
 
+- [https://github.com/garyburd/redigo](https://github.com/garyburd/redigo)
+- [https://github.com/go-redis/redis](https://github.com/go-redis/redis)
+- [https://github.com/hoisie/redis](https://github.com/hoisie/redis)
 - [https://github.com/alphazero/Go-Redis](https://github.com/alphazero/Go-Redis)
-- [http://code.google.com/p/tideland-rdc/](http://code.google.com/p/tideland-rdc/)
 - [https://github.com/simonz05/godis](https://github.com/simonz05/godis)
-- [https://github.com/hoisie/redis.go](https://github.com/hoisie/redis.go)
+
+Let's see how to use the driver that redigo to operate on a database:
+
+```Go
+
+	package main
+
+	import (
+		"fmt"
+		"github.com/garyburd/redigo/redis"
+		"os"
+    	"os/signal"
+		"syscall"
+		"time"
+	)
+
+	var (
+		Pool *redis.Pool
+	)
+
+	func init() {
+		redisHost := ":6379"
+		Pool = newPool(redisHost)
+		close()
+	}
+
+	func newPool(server string) *redis.Pool {
+
+		return &redis.Pool{
+
+			MaxIdle:     3,
+			IdleTimeout: 240 * time.Second,
+
+			Dial: func() (redis.Conn, error) {
+				c, err := redis.Dial("tcp", server)
+				if err != nil {
+					return nil, err
+				}
+				return c, err
+			},
+
+			TestOnBorrow: func(c redis.Conn, t time.Time) error {
+				_, err := c.Do("PING")
+				return err
+			},
+		}
+	}
+
+	func close() {
+		c := make(chan os.Signal, 1)
+		signal.Notify(c, os.Interrupt)
+		signal.Notify(c, syscall.SIGTERM)
+		signal.Notify(c, syscall.SIGKILL)
+		go func() {
+			<-c
+			Pool.Close()
+			os.Exit(0)
+		}()
+	}
+
+	func Get(key string) ([]byte, error) {
+
+		conn := Pool.Get()
+		defer conn.Close()
+
+		var data []byte
+		data, err := redis.Bytes(conn.Do("GET", key))
+		if err != nil {
+			return data, fmt.Errorf("error get key %s: %v", key, err)
+		}
+		return data, err
+	}
+
+	func main() {
+		test, err := Get("test")
+		fmt.Println(test, err)
+	}
+
+```
 
 I forked the last of these packages, fixed some bugs, and used it in my short URL service (2 million PV every day).