memcached installation and use of libmemcached

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memcached Installation and Libmemcached usage environment and version

Operating system: Ubuntu14.04 32bit
Libevent version: 2.0.21
Memdatach version: v1.4.21

Libevent Installation

#wget http://github.com/downloads/libevent/libevent/libevent-2.0.21-stable.tar.gz#tar -xvzf libevent-2.0.21-stable.tar.gz#cd libevent-2.0.21-stable#./configure -prefix=/usr#make#make install

To see if the installation was successful:

#ls /usr/lib/ | grep  libevent

memcached Installation

#wget wget http://www.memcached.org/files/memcached-1.4.21.tar.gz#tar -xvzf memcached-1.4.21.tar.gz#cd memcached-1.4.21#./configure -with-libevent=/usr#make#make install

To see if the installation was successful:

#ll /usr/local/bin

memcached start

#/usr/local/bin/memcached -d -u root -m 512 127.0.0.1 -p 11211

To view the listening port and process information:

#netstat -a |grep 11211#ps -ef | grep memcached

Test memcached

The simplest way to connect memcached is through Telnet.

#telnet 127.0.0.1 11211

To view the status of Memcached (performed under Telnet):

stats

Simple setting, viewing and deletion of key values (Telnet execution):

set user_id 0 0 512345get user_iddelete user_idget user_id

PS: Exit Telnet, you can type ALT +] Q

libmemcached Installation

#wget https://launchpad.net/libmemcached/1.0/1.0.18/+download/libmemcached-1.0.18.tar.gz#tar -xvzf libmemcached-1.0.18.tar.gz#cd libmemcached-1.0.18#./configure#make#make install

To see if the libmemcached installed successfully:

#ls /usr/local/lib | grep libmemcached

Connect via libmemcached using C + + memcached#

C + + source file Libmemcachedtest.cpp

1#include <iostream>2#include <string>3#include <libmemcached/memcached.h>45UsingNamespaceStd;67IntMain(Intargc,Char*Argv[])8{9Connect server10cout<<"Test Start"<<Endl;11Memcached_st*Memc;12Memcached_returnRc;13Memcached_server_st*Server;14uint32_tFlags;1516Memc=Memcached_create(Null);17cout<<"Append Start"<<Endl;18Server=Memcached_server_list_append(Null,"LocalHost",11211,&Rc);19If(Rc!=Memcached_success){20cout<<"Memcached_server_list_append failed. Rc= "<<Rc<<Endl;21stReturn-1;22}2324Rc=Memcached_server_push(Memc,Server);25If(Rc!=Memcached_success){26cout<<"Memcached_server_push failed. Rc= "<<Rc<<Endl;27Memcached_server_free(Server);28Return-2;29};3031Memcached_server_list_free(Server);3233StringKey="Key";34StringValue="Value";35size_tValue_length=Value.Length();36size_tKey_length=Key.Length();3738Save data39cout<<"Save Data"<<Endl;40Rc=Memcached_set(Memc,Key.C_str(),Key_length,Value.C_str(),Value_length,0,Flags);41If(Rc==Memcached_success){42cout<<"Save data sucessful, key="<<Key<<", value="<<Value<<Endl;43}Else{44cout<<"Save data Faild, rc="<<Rc<<Endl;45}4647Get Data48cout<<"Get Data"<<Endl;49Char*Result=Memcached_get(Memc,Key.C_str(),Key_length,&Value_length,&Flags,&Rc);50If(Rc==Memcached_success){51cout<<"Get value sucessful, result="<<Result<<Endl;52}Else{53cout<<"Get value Faild, rc="<<Rc<<Endl;54}5556Delete data57cout<<"Delete Data"<<Endl;58Rc=Memcached_delete(Memc,Key.C_str(),Key_length,0);59If(Rc==Memcached_success){60cout<<"Delete key sucessful. Key= "<<Key<<Endl;61}else{62 cout <<  "Delete key faild, rc=" << rc << endl; }64 65 //free memcached_free (memc cout <<  "Test end." << endl; return 0;                 

The LD_LIBRARY_PATH environment changes need to be set before compiling so that libmemcached can be found.

$export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/

Compile and execute:

$g++ -std=c++11 -o libmemcachedtest libmemcachedtest.cpp -lmemcached$./libmemcachedtest

If all goes well, the output is as follows:

test startappend startsave datasave data sucessful, key=key,value=valueget dataget value sucessful, result=valuedelete datadelete key sucessful. key=keytest end.

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memcached installation and use of libmemcached