Go操作redis与redigo的示例解析

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Go-操作redis

安装

golang操作redis的客户端包有多个比如redigo、go-redis，github上Star最多的莫属redigo。

github地址：https://github.com/garyburd/redigo 目前已经迁移到：https://github.com/gomodule/redigo

文档：https://godoc.org/github.com/garyburd/redigo/redis

go get github.com/garyburd/redigo/redis
import "github.com/garyburd/redigo/redis"

连接

Conn接口是与Redis协作的主要接口，可以使用Dial,DialWithTimeout或者NewConn函数来创建连接，当任务完成时，应用程序必须调用Close函数来完成操作。

package main
import (
"github.com/garyburd/redigo/redis"
"fmt"
)
func main()  {
    conn,err := redis.Dial("tcp","10.1.210.69:6379")
    if err != nil {
        fmt.Println("connect redis error :",err)
        return
    }
    defer conn.Close()
}

使用

package main
import (
"github.com/garyburd/redigo/redis"
"fmt"
)
func main()  {
    conn,err := redis.Dial("tcp","10.1.210.69:6379")
    if err != nil {
        fmt.Println("connect redis error :",err)
        return
    }
    defer conn.Close()
    _, err = conn.Do("SET", "name", "wd")
    if err != nil {
        fmt.Println("redis set error:", err)
    }
    name, err := redis.String(conn.Do("GET", "name"))
    if err != nil {
        fmt.Println("redis get error:", err)
    } else {
        fmt.Printf("Got name: %s \n", name)
    }
}

设置key过期时间

  _, err = conn.Do("expire", "name", 10) //10秒过期
    if err != nil {
        fmt.Println("set expire error: ", err)
        return
    }

批量获取mget、批量设置mset

_, err = conn.Do("MSET", "name", "wd","age",22)
    if err != nil {
        fmt.Println("redis mset error:", err)
    }
    res, err := redis.Strings(conn.Do("MGET", "name","age"))
    if err != nil {
        fmt.Println("redis get error:", err)
    } else {
        res_type := reflect.TypeOf(res)
        fmt.Printf("res type : %s \n", res_type)
        fmt.Printf("MGET name: %s \n", res)
        fmt.Println(len(res))
    }
//结果：
//res type : []string 
//MGET name: [wd 22] 
//2

列表操作

package main
import (
"github.com/garyburd/redigo/redis"
"fmt"
    "reflect"
)
func main()  {
    conn,err := redis.Dial("tcp","10.1.210.69:6379")
    if err != nil {
        fmt.Println("connect redis error :",err)
        return
    }
    defer conn.Close()
    _, err = conn.Do("LPUSH", "list1", "ele1","ele2","ele3")
    if err != nil {
        fmt.Println("redis mset error:", err)
    }
    res, err := redis.String(conn.Do("LPOP", "list1"))
    if err != nil {
        fmt.Println("redis POP error:", err)
    } else {
        res_type := reflect.TypeOf(res)
        fmt.Printf("res type : %s \n", res_type)
        fmt.Printf("res  : %s \n", res)
    }
}
//res type : string 
//res  : ele3

hash操作

package main
import (
"github.com/garyburd/redigo/redis"
"fmt"
    "reflect"
)
func main()  {
    conn,err := redis.Dial("tcp","10.1.210.69:6379")
    if err != nil {
        fmt.Println("connect redis error :",err)
        return
    }
    defer conn.Close()
    _, err = conn.Do("HSET", "student","name", "wd","age",22)
    if err != nil {
        fmt.Println("redis mset error:", err)
    }
    res, err := redis.Int64(conn.Do("HGET", "student","age"))
    if err != nil {
        fmt.Println("redis HGET error:", err)
    } else {
        res_type := reflect.TypeOf(res)
        fmt.Printf("res type : %s \n", res_type)
        fmt.Printf("res  : %d \n", res)
    }
}
//res type : int64 
//res  : 22 

Pipelining(管道)

管道操作可以理解为并发操作，并通过Send()，Flush()，Receive()三个方法实现。客户端可以使用send()方法一次性向服务器发送一个或多个命令，命令发送完毕时，使用flush()方法将缓冲区的命令输入一次性发送到服务器，客户端再使用Receive()方法依次按照先进先出的顺序读取所有命令操作结果。

Send(commandName string, args ...interface{}) error
Flush() error
Receive() (reply interface{}, err error)

• Send：发送命令至缓冲区
• Flush：清空缓冲区，将命令一次性发送至服务器
• Recevie：依次读取服务器响应结果，当读取的命令未响应时，该操作会阻塞。

package main
import (
"github.com/garyburd/redigo/redis"
"fmt"
)
func main()  {
    conn,err := redis.Dial("tcp","10.1.210.69:6379")
    if err != nil {
        fmt.Println("connect redis error :",err)
        return
    }
    defer conn.Close()
    conn.Send("HSET", "student","name", "wd","age","22")
    conn.Send("HSET", "student","Score","100")
    conn.Send("HGET", "student","age")
    conn.Flush()
    res1, err := conn.Receive()
    fmt.Printf("Receive res1:%v \n", res1)
    res2, err := conn.Receive()
    fmt.Printf("Receive res2:%v\n",res2)
    res3, err := conn.Receive()
    fmt.Printf("Receive res3:%s\n",res3)
}
//Receive res1:0 
//Receive res2:0
//Receive res3:22

redis发布会订阅模式

package main
import (
    "github.com/garyburd/redigo/redis"
    "fmt"
    "time"
)
func Subs() {  //订阅者
    conn, err := redis.Dial("tcp", "10.1.210.69:6379")
    if err != nil {
        fmt.Println("connect redis error :", err)
        return
    }
    defer conn.Close()
    psc := redis.PubSubConn{conn}
    psc.Subscribe("channel1") //订阅channel1频道
    for {
        switch v := psc.Receive().(type) {
        case redis.Message:
            fmt.Printf("%s: message: %s\n", v.Channel, v.Data)
        case redis.Subscription:
            fmt.Printf("%s: %s %d\n", v.Channel, v.Kind, v.Count)
        case error:
            fmt.Println(v)
            return
        }
    }
}
func Push(message string)  { //发布者
    conn, _ := redis.Dial("tcp", "10.1.210.69:6379")
    _,err1 := conn.Do("PUBLISH", "channel1", message)
       if err1 != nil {
             fmt.Println("pub err: ", err1)
                 return
            }

}
func main()  {
    go Subs()
    go Push("this is wd")
    time.Sleep(time.Second*3)
}
//channel1: subscribe 1
//channel1: message: this is wd

事务操作

MULTI, EXEC,DISCARD和WATCH是构成Redis事务的基础，当然我们使用go语言对redis进行事务操作的时候本质也是使用这些命令。

MULTI：开启事务

EXEC：执行事务

DISCARD：取消事务

WATCH：监视事务中的键变化，一旦有改变则取消事务。

示例：

package main
import (
"github.com/garyburd/redigo/redis"
"fmt"
)
func main()  {
    conn,err := redis.Dial("tcp","10.1.210.69:6379")
    if err != nil {
        fmt.Println("connect redis error :",err)
        return
    }
    defer conn.Close()
    conn.Send("MULTI")
    conn.Send("INCR", "foo")
    conn.Send("INCR", "bar")
    r, err := conn.Do("EXEC")
    fmt.Println(r)
}
//[1, 1]

万能操作

连接redis

conn,err := redis.Dial(
  "tcp",
  "10.0.3.100:6379",
  redis.DialPassword("EfcHGSzKqg6cfzWq"),
  redis.DialDatabase(8))
if err != nil {
  fmt.Println("connect redis error :",err)
  return
}
defer conn.Close()

写入

//写入
//_, err = conn.Do("LPUSH", "list1", "ele1","ele2","ele3")
_, err = conn.Do("reids写入方法", "key名字", "内容1","内容2","内容3")
if err != nil {
  fmt.Println("redis set error:", err)
}

读取

//读取
redis.Strings：返回多个
redis.String：返回一个
redis.int:返回统计的数字
//获取集合所有成员
//name, err := redis.Strings(conn.Do("smembers", "beautiful_user"))
// 返回集合成员数
//name, err := redis.Int(conn.Do("scard", "beautiful_user"))
name, err := redis.方法名(conn.Do("redis读取方法", "key名字"))
if err != nil {
  fmt.Println("redis get error:", err)
} else {
  fmt.Printf("Got name: %s \n", name)
}

全部代码

package main
import (
	"fmt"
	"github.com/garyburd/redigo/redis"
)
func main()  {
	conn,err := redis.Dial("tcp","10.0.3.100:6379",redis.DialPassword("EfcHGSzKqg6cfzWq"),redis.DialDatabase(8))
	if err != nil {
		fmt.Println("connect redis error :",err)
		return
	}
	defer conn.Close()
	//写入
	_, err = conn.Do("LPUSH", "list1", "ele1","ele2","ele3")
	if err != nil {
		fmt.Println("redis set error:", err)
	}
	//读取
	name, err := redis.Strings(conn.Do("smembers", "beautiful_user"))
	if err != nil {
		fmt.Println("redis get error:", err)
	} else {
		fmt.Printf("Got name: %s \n", name)
	}
}

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