memcached安装和libmemcached的使用

环境和版本

操作系统：Ubuntu14.04 32bit
libevent版本: 2.0.21
memdatach版本: v1.4.21

libevent安装

#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

查看是否安装成功:

#ls /usr/lib/ | grep libevent

memcached安装

#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

查看是否安装成功:

#ll /usr/local/bin

memcached启动

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

查看侦听端口和进程信息：

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

测试memcached

连接memcached最简单的方法是通过telnet。

#telnet 127.0.0.1 11211

查看memcached的状态(telnet下执行):

stats

键值简单的设置、查看和删除(telnet下执行):

set user_id 0 0 5 12345 get user_id delete user_id get user_id

PS:退出telnet，可以键入alt+] q

libmemcached安装

#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

查看libmemcached是否安装成功:

#ls /usr/local/lib | grep libmemcached

使用C++通过libmemcached连接memcached#

C++源文件 libmemcachedtest.cpp

 1 #include <iostream>  2 #include <string>  3 #include <libmemcached/memcached.h>  4  5 using namespace std;  6  7 int main(int argc, char *argv[])  8 {  9 //connect server 10 cout << "test start" << endl; 11 memcached_st *memc; 12 memcached_return rc; 13 memcached_server_st *server; 14 uint32_t flags; 15 16 memc = memcached_create(NULL); 17 cout << "append start" << endl; 18 server = memcached_server_list_append(NULL, "localhost", 11211, &rc); 19 if(rc != MEMCACHED_SUCCESS){ 20 cout << "memcached_server_list_append failed. rc=" << rc << endl; 21 return -1; 22 } 23 24 rc = memcached_server_push(memc, server); 25 if(rc != MEMCACHED_SUCCESS){ 26 cout << "memcached_server_push failed. rc=" << rc << endl; 27 memcached_server_free(server); 28 return -2; 29 }; 30 31 memcached_server_list_free(server); 32 33 string key = "key"; 34 string value = "value"; 35 size_t value_length = value.length(); 36 size_t key_length = key.length(); 37 38 //Save data 39 cout << "save data" << endl; 40 rc = memcached_set(memc, key.c_str(), key_length, value.c_str(), value_length, 0, flags); 41 if(rc == MEMCACHED_SUCCESS){ 42 cout << "save data sucessful, key=" << key << ",value=" << value <<endl; 43 }else{ 44 cout << "save data faild, rc=" << rc <<endl; 45 } 46 47 //get data 48 cout << "get data" << endl; 49 char* result = memcached_get(memc, key.c_str(), key_length, &value_length, &flags, &rc); 50 if(rc == MEMCACHED_SUCCESS){ 51 cout << "get value sucessful, result=" << result <<endl; 52 }else{ 53 cout << "get value faild, rc=" << rc <<endl; 54 } 55 56 //delete data 57 cout << "delete data" << endl; 58 rc = memcached_delete(memc, key.c_str(), key_length, 0); 59 if(rc == MEMCACHED_SUCCESS){ 60 cout << "delete key sucessful. key=" << key << endl; 61 }else{ 62 cout << "delete key faild, rc=" << rc <<endl; 63 } 64 65 //free 66 memcached_free(memc); 67 cout << "test end." << endl; 68 return 0; 69 }

编译前需要设置LD_LIBRARY_PATH环境变更，以使libmemcached能被找到。

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

编译并执行：

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

如果一切顺利，输出如下：

test start append start save data save data sucessful, key=key,value=value get data get value sucessful, result=value delete data delete key sucessful. key=key test end.

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