hiredis

hiredis是redis开源库对外发布的客户端API包。

当redis-server配置启动后，可以通过hiredis操作redis资源。

主要分为：

　　strings、hash、lists、sets、sort sets

hiredis使用较为简单，下面是几个主要的函数和对象：

 /*
作用：用于连接redis服务器
 ip : 为redis的ip地址;
 port： 端口地址；
 tv：连接超时的参数；
*/
 redisContext *redisConnectWithTimeout(const char *ip, int port, struct timeval tv);

/*
作用：执行命令
c：redisConnectWitTimeout返回的对象；
format：命令参数；
*/

void *redisCommand(redisContext *c, const char *format, ...)

 /*
 说明：redisCommand返回的对象指针，也就是已经命令返回的结果数据
*/

 typedef struct redisReply {
      int type; /* REDIS_REPLY_* */
      long long integer; /* The integer when type is REDIS_REPLY_INTEGER */
     int len; /* Length of string */
      char *str; /* Used for both REDIS_REPLY_ERROR and REDIS_REPLY_STRING */
      size_t elements; /* number of elements, for REDIS_REPLY_ARRAY */
      struct redisReply **element; /* elements vector for REDIS_REPLY_ARRAY */
  } redisReply;

来一个具体的实例

 /*需要配置，才能编译通过*/
 #include <iostream>
 #include "hiredis.h"

 #define MAX_LEN  64

 int main()
 {
     timeval timeout = {,};
     char ip[MAX_LEN],passwd[MAX_LEN];
     memset(ip,,MAX_LEN);
     memset(passwd,,MAX_LEN);
     sprintf(ip,"*****");
     sprintf(passwd,"******");
     uint32_t port = ;
     redisContext  *m_pRedisContext = redisConnectWithTimeout(ip,port,timeout);
     if(m_pRedisContext->err){
         std::cout << "log, redis connect error\n";
         return ;
     }

     redisReply *reply = static_cast<redisReply*>(redisCommand(m_pRedisContext,\
                 "AUTH %s",passwd));
     if(!reply){
         std::cout << "log, redis command error, " << m_pRedisContext->errstr << \
             std::endl;
         return ;
     }

     std::cout << "AUTH " << passwd << reply->str << std::endl;
     freeReplyObject(reply);

     //create datadase id = 1;
     uint32_t index  = ;
     reply = static_cast<redisReply*>(redisCommand(m_pRedisContext,"SELECT %d",));
     if(!reply) {
         std::cout << "log, redis command error," << m_pRedisContext->errstr << \
             std::endl;
         freeReplyObject(reply);
         return ;
     }

     std::cout << "SELECT " << index << reply->str << std::endl;
     freeReplyObject(reply);

     uint32_t id = ;
     reply = static_cast<redisReply*>(redisCommand(m_pRedisContext, \
                 "HMSET user:%u %s %s %s %s",id,"name","xuxu","age",""));
     if(!reply){
         std::cout << "log, redis command error," << m_pRedisContext->errstr << \
             std::endl;
         freeReplyObject(reply);
         return ;
     }

     reply = static_cast<redisReply*>(redisCommand(m_pRedisContext,\
                 "SET name:%s %s","","liushun"));
     if(!reply){
         std::cout << "log, redis command error, " << m_pRedisContext->errstr << \
             std::endl;
         freeReplyObject(reply);
         return ;
   }

     reply = static_cast<redisReply*>(redisCommand(m_pRedisContext,"GET name:%s",""));
     if(!reply){
         std::cout << "log, redis command error," << m_pRedisContext->errstr << \
             std::endl;
         freeReplyObject(reply);
         return ;
     }

     std::cout << reply->str << std::endl;
     freeReplyObject(reply);

     return ;
 }