How to operate redis and redigo in Go

Go-Operation redis

Installation

There are multiple client packages for golang to operate redis, such as redigo and go-redis. The one with the most stars on github is redigo.

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

Connection

The Conn interface is the main interface for collaboration with Redis. You can use the Dial, DialWithTimeout or NewConn function to create a connection. When the task is completed, the application must call the Close function to complete the operation. .

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()
}

Use

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)
    }
}

Set key expiration time

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

Get mget in batches and set mset in batches

_, 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

List operation

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 Operation

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(Pipelining)

By using the three methods Send(), Flush() and Receive(), pipeline operations can be performed in a concurrent manner. The client can use the send() method to send one or more commands to the server at once. When the command is sent, the flush() method is used to send the command input in the buffer to the server at once. The client then uses the Receive() method in sequence. Read all command operation results in first-in, first-out order.

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

• Send: Send the command to the buffer

• Flush: Clear the buffer and send the command to the server in one go

• Recevie: Read the server response results in sequence. When the read command does not respond, the operation will block.

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 publishing subscription mode

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

Transaction operation

MULTI, EXEC, DISCARD and WATCH are the basis of Redis transactions. Of course we use Go language essentially uses these commands when performing transaction operations on redis.

MULTI: Open transaction

EXEC: Execute transaction

DISCARD: Cancel transaction

WATCH: Monitor key changes in the transaction and cancel once there is a change affairs.

Example:

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]

Universal operation

Connect 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()

Write

//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)
}

Read

//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)
}

All codes

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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