golang使用redis(一)

使用redigo库操作redis

安装

go get github.com/gomodule/redigo/redis

连接

c, err := redis.Dial("tcp",
        "172.17.84.205:6379",
        redis.DialKeepAlive(1*time.Second),
        redis.DialPassword("123456"),
        redis.DialConnectTimeout(5*time.Second),
        redis.DialReadTimeout(1*time.Second),
        redis.DialWriteTimeout(1*time.Second))

    if err != nil {
        fmt.Println("error:", err)
        return
    }

    defer c.Close()

set/get key-value

_, err = c.Do("set", "testkey1", "Hello from redis")

r, err := redis.String(c.Do("get", "testkey1"))

如果要设置过期时间

_, err = c.Do("set", "testkey1", "Hello from redis", "EX", "5")

其中 "EX", "5" 是设置的过期时间5秒

mset/mget 设置获取多个键值

_, err = c.Do("mset", "name", "Michael", "sex", "M", "age", 23, "postcode", 2343253)
stringValues, err := redis.Strings(c.Do("mget", "name", "sex"))
intValues, err := redis.Ints(c.Do("mget", "age", "postcode"))

for _, v := range stringValues {
    fmt.Println(v)
}

for _, i := range intValues {
    fmt.Println(i)
}

HSET key field value

将哈希表 key 中的域 field 的值设为 value

_, err = c.Do("hset", "books", "name", "golang", "author", "Moon", "pages", "4000")
if err != nil {
    fmt.Println("err:", err)
}

v, err := redis.String(c.Do("hget", "books", "name"))
v, err := redis.String(c.Do("hget", "books", "author"))

HMSET/HGETALL,HMGET

在使用前先说明几个函数

  • type Args []interface{}

    从结构化的值构造命令参数

  • func (args Args) Add(value ...interface{}) Args

    添加值到Args

  • func (args Args) AddFlat(v interface{}) Args

    添加Map, Slice, struct等的值到Args

  • func ScanStruct(src []interface{}, dest interface{}) error

    将name和value从src转变成dest

示例代码如下

package main

import (
    "fmt"
    "os"
    "time"

    redis "github.com/gomodule/redigo/redis"
)

type Book struct {
    BookName  string
    Author    string
    PageCount string
    Press     string
}

func main() {
    c, err := redis.Dial("tcp",
        "172.17.84.205:6379",
        redis.DialKeepAlive(1*time.Second),
        redis.DialPassword("123456"),
        redis.DialConnectTimeout(5*time.Second),
        redis.DialReadTimeout(1*time.Second),
        redis.DialWriteTimeout(1*time.Second))

    errCheck(err)

    defer c.Close()

    //Struct
    top1 := Book{
        BookName:  "Crazy golang",
        Author:    "Moon",
        PageCount: "600",
        Press:     "GoodBook",
    }

    if _, err = c.Do("HMSET", redis.Args{}.Add("Top1").AddFlat(&top1)...); err != nil {
        fmt.Println(err)
        return
    }

    //Map
    top2 := map[string]string{
        "BookName":  "Mast C++",
        "Author":    "Diablo",
        "PageCount": "2000",
        "Press":     "BLZ",
    }

    if _, err = c.Do("HMSET", redis.Args{}.Add("Top2").AddFlat(top2)...); err != nil {
        fmt.Println(err)
        return
    }

    top3 := []string{"BookName", "Deep learning",
        "Author", "Barl",
        "PageCount", "2600",
        "Publish House", "BLZ"}
    _, err = c.Do("HMSET", redis.Args{}.Add("Top3").AddFlat(top3)...)
    errCheck(err)

    topx := Book{}

    for _, item := range []string{"Top1", "Top2", "Top3"} {
        value, err := redis.Values(c.Do("HGETALL", item))
        errCheck(err)

        err = redis.ScanStruct(value, &topx)
        errCheck(err)

        fmt.Printf("%s[%+v]\n", item, topx)
    }

    stringsValue, err := redis.Strings(c.Do("HMGET", "Top1", "BookName", "Author"))
    errCheck(err)

    fmt.Printf("hmget:%+v\n", stringsValue)

}

func errCheck(err error) {
    if err != nil {
        fmt.Println(err)
        os.Exit(-1)
    }
}
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