Golang(8)Database NOSQL

Golang(8)Database NOSQL

Redis
I am using redis 2.9.11

https://github.com/hoisie/redis
https://github.com/astaxie/goredis

Install the Driver
>go get github.com/astaxie/goredis

First of all, easily set up my Redis DB on my local machine. I will not demo the cluster mode. Just use the easiest one.

>cd /opt/redis
>./redis-server ./redis.conf

Once the server is started, we will see the log information as follow:
09 May 23:18:45.226 * The server is now ready to accept connections on port 7000

Then I can connect to the localhost server on the port 7000
>./redis-cli -h 127.0.0.1 -p 7000

Then running my go program to connect to the DB
package main

import (
     "fmt"
     "github.com/astaxie/goredis"
)

func main() {
     var client goredis.Client
     //set the address and port
     client.Addr = "127.0.0.1:7000"

     //string operation
     client.Set("a", []byte("hello"))
     val, _ := client.Get("a")
     fmt.Println(string(val))
     client.Del("a")

     //list
     vals := []string{"a", "b", "c", "d", "e"}
     for _, v := range vals {
          client.Rpush("l", []byte(v))
     }
     dbvals, _ := client.Lrange("l", 0, 4)
     for i, v := range dbvals {
          println(i, ":", string(v))
     }
     client.Del("l")
}

Here is the console output
hello 0 : a 1 : b 2 : c 3 : d 4 : e


MongoDB
Upgrade to 2.6.0
>mv mongodb-osx-x86_64-2.6.0 /Users/carl/tool/
>sudo ln -s /Users/carl/tool/mongodb-osx-x86_64-2.6.0 /opt/mongodb-2.6.0
>sudo rm -fr /opt/mongodb
>sudo ln -s /opt/mongodb-2.6.0 /opt/mongodb

>mongod -f mongodb.conf
>mongo --host 127.0.0.1 --port 27017

I saw some warning messages as follow:
2014-05-11T13:58:01.765-0500 [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000

Solution:
First of all, check the max of the open files
>ulimit -n 
256

It really small number.
I can set it to a high number.
>ulimit -n 1024

But it will only working before we reboot the system.
>launchctl limit maxfiles 1024 1024

This command can make it working forever.

mgo is not official supported.
http://docs.mongodb.org/ecosystem/drivers/go/

http://godoc.org/labix.org/v2/mgo

…TODO

References:
Redis 1~ 7
http://sillycat.iteye.com/blog/1549504
http://sillycat.iteye.com/blog/1553507
http://sillycat.iteye.com/blog/1553508
http://sillycat.iteye.com/blog/1553509
http://sillycat.iteye.com/blog/2028180
http://sillycat.iteye.com/blog/2033094
http://sillycat.iteye.com/blog/2059166

MongoDB 1 ~ 5
http://sillycat.iteye.com/blog/1547291    Concept and Installation on windows and ubuntu
http://sillycat.iteye.com/blog/1547292    Java DAO Layer Example
http://sillycat.iteye.com/blog/1547294    Java DAO Layer Example
http://sillycat.iteye.com/blog/1965857     Installation on MAC and Replication, 1 Master, 2 Secondaries
http://sillycat.iteye.com/blog/1965880     Scala Clients

https://github.com/astaxie/build-web-application-with-golang/blob/master/ebook/05.6.md