package main

import (
	"fmt"
	"github.com/go-redis/redis"
)

// redis
// 与mysql类似，也是一个连接池对象
var redisdb *redis.Client

func initRedis() (err error) {
	//这里不要声明为局部变量
	redisdb = redis.NewClient(&redis.Options{
		Addr:     "43.143.245.135:6379",
		Password: "ningzaichun",
		DB:       0,
	})
	pong, err := redisdb.Ping().Result()
	if err != nil {
		return err
	}
	fmt.Println("pong", pong)
	return nil

}
func main() {
	err := initRedis()
	if err != nil {
		fmt.Println("connect redis failed", err)
		return
	}
	fmt.Println("redis connect success")

	//zset
	key := "rank"
	languages := []redis.Z{
		{Score: 90.0, Member: "Golang"},
		{Score: 98.0, Member: "Java"},
		{Score: 95.0, Member: "Python"},
		{Score: 97.0, Member: "JavaScript"},
		{Score: 99.0, Member: "C/C++"},
	}
	//把元素追加到key
	num, err := redisdb.ZAdd(key, languages...).Result()
	if err != nil {
		fmt.Println("add languages failed", err)
	}
	fmt.Println("add languages success", num)
	//给Golang加10分
	newScore, err := redisdb.ZIncrBy(key, 10, "Golang").Result()
	if err != nil {
		fmt.Printf("zincrby failed, err:%v\n", err)
		return
	}
	fmt.Printf("Golang's score is %f now.\n", newScore)
}