Ubuntu15.04 C语言操作Redis

1、安装redis


        下载最新稳定版本redis源码包： 

       liang@bogon:~/redis3$ wget http://download.redis.io/releases/redis-3.0.5.tar.gz
       liang@bogon:~/redis3$ ls

        编译安装redis： 
        下载成功，解压redis源码包

       liang@bogon:~/redis3$ tar zxvf redis-3.0.5.tar.gz
       liang@bogon:~/redis3/redis-3.0.5$ ls      

       解压缩后，进入redis源码目录

       liang@bogon:~/redis3$ cd redis-3.0.5/
       liang@bogon:~/redis3/redis-3.0.5$ ls
       liang@bogon:~/redis3/redis-3.0.5$ make
       liang@bogon:~/redis3/redis-3.0.5$ sudo make install

      测试redis安装是否成功

       liang@bogon:~/redis3/redis-3.0.5$ make test     

       出错提示：
       

       You need tcl 8.5 or newer in order to run the Redis test
       Makefile:211: recipe for target 'test' failed
       make[1]: *** [test] Error 1
       make[1]: Leaving directory '/home/liang/redis3/redis-3.0.5/src'
       Makefile:6: recipe for target 'test' failed
       make: *** [test] Error 2

        安装tcl 8.5支持redis         

       liang@bogon:~/redis3/redis-3.0.5$ sudo apt-get install tcl

      再次测试redis安装是否成功

       liang@bogon:~/redis3/redis-3.0.5$ make test  

       不再提示需要依赖，redis可以正常运行了

        配置redis服务：

       redis的配置文件在redis-3.0.5目录下的redis.conf，不指定配置文件redis使用默认配置

       在配置文件可以设置port、pidfile、daemonize、bind等等配置项

       

    测试redis功能：

        启动redis服务器

       liang@bogon:~/redis3/redis-3.0.5$ src/redis-server

       启动redis命令行
 

      liang@bogon:~/redis3/redis-3.0.5$ redis-cli

        设置一个键值

       127.0.0.1:6379> set joy yes

        查询键值joy的值是否为yes

       127.0.0.1:6379> get joy

2、C客户端连接redis
               
      下载redis客户端C语言源码包：
       安装github下载工具

       liang@bogon:~$ sudo apt-get install git

        从github下载C客户端源码包

       liang@bogon:~$ git clone https://www.github.com/redis/hiredis

        编译安装redis客户端：
        下载后进入，hredis目录

       liang@bogon:~$ cd hiredis/
       liang@bogon:~/hiredis$ make
       liang@bogon:~/hiredis$ sudo make install

       

     拷贝库文件到系统默认的库目录

       liang@bogon:~/hiredis$ sudo cp libhiredis.so /usr/lib

      重新加载库

        sudo idconfig

         进入examples目录

        liang@bogon:~/hiredis$ cd examples/

      编译生成一个客户端

        liang@bogon:~/hiredis/examples$ gcc example.c -o example -lhiredis

        若提示一些如read.h等头文件error，进入hiredis，执行下面命令，重新编译

        liang@bogon:~/hiredis$ sudo cp *.h /usr/include/

     测试redis客户端功能：

       运行example

        liang@bogon:~/hiredis/examples$ ./example

       出现下面结果，即C客户端操作redis成功

   PING: PONG
   SET: OK
   SET (binary API): OK
   GET foo: hello world
   INCR counter: 1
   INCR counter: 2
   0) element-9
   1) element-8
   2) element-7
   3) element-6
   4) element-5
   5) element-4
   6) element-3
   7) element-2
   8) element-1
   9) element-0

        然后就可以开始真正的用C编写操作redis数据库了,最后附上example.c源码，在hiredis目录也有

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <hiredis.h>

int main(int argc, char **argv) {
    unsigned int j;
    redisContext *c;
    redisReply *reply;
    const char *hostname = (argc > 1) ? argv[1] : "127.0.0.1";
    int port = (argc > 2) ? atoi(argv[2]) : 6379;

    struct timeval timeout = { 1, 500000 }; // 1.5 seconds
    c = redisConnectWithTimeout(hostname, port, timeout);
    if (c == NULL || c->err) {
        if (c) {
            printf("Connection error: %s\n", c->errstr);
            redisFree(c);
        } else {
            printf("Connection error: can't allocate redis context\n");
        }
        exit(1);
    }

    /* PING server */
    reply = redisCommand(c,"PING");
    printf("PING: %s\n", reply->str);
    freeReplyObject(reply);

    /* Set a key */
    reply = redisCommand(c,"SET %s %s", "foo", "hello world");
    printf("SET: %s\n", reply->str);
    freeReplyObject(reply);

    /* Set a key using binary safe API */
    reply = redisCommand(c,"SET %b %b", "bar", (size_t) 3, "hello", (size_t) 5);
    printf("SET (binary API): %s\n", reply->str);
    freeReplyObject(reply);

    /* Try a GET and two INCR */
    reply = redisCommand(c,"GET foo");
    printf("GET foo: %s\n", reply->str);
    freeReplyObject(reply);

    reply = redisCommand(c,"INCR counter");
    printf("INCR counter: %lld\n", reply->integer);
    freeReplyObject(reply);
    /* again ... */
    reply = redisCommand(c,"INCR counter");
    printf("INCR counter: %lld\n", reply->integer);
    freeReplyObject(reply);

    /* Create a list of numbers, from 0 to 9 */
    reply = redisCommand(c,"DEL mylist");
    freeReplyObject(reply);
    for (j = 0; j < 10; j++) {
        char buf[64];

        snprintf(buf,64,"%u",j);
        reply = redisCommand(c,"LPUSH mylist element-%s", buf);
        freeReplyObject(reply);
    }

    /* Let's check what we have inside the list */
    reply = redisCommand(c,"LRANGE mylist 0 -1");
    if (reply->type == REDIS_REPLY_ARRAY) {
        for (j = 0; j < reply->elements; j++) {
            printf("%u) %s\n", j, reply->element[j]->str);
        }
    }
    freeReplyObject(reply);

    /* Disconnects and frees the context */
    redisFree(c);

    return 0;
}