hiredis

redis

编译

g++ main.cpp -lhiredis

使用

#include<hiredis/hiredis.h>

redisContext* l_redis_context = redisConnect("127.0.0.1", 6379);

if (l_redis_context == nullptr)
{
    std::cout << " redis null " << std::endl;
    return;
}
    
redisCommand(l_redis_context, "LPUSH key_name %b", l_str.c_str(), l_str.size());

hiredis基础知识

redisReply结构体

• redisReply

    typedef struct redisReply {
        int type; /* REDIS_REPLY_* */
        long long integer; /* The integer when type is REDIS_REPLY_INTEGER */
        size_t 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;

• redisReply-type

    #define REDIS_REPLY_STRING 1    //存放在char *str
    #define REDIS_REPLY_ARRAY 2
    #define REDIS_REPLY_INTEGER 3   //integer存储为数据条数
    #define REDIS_REPLY_NIL 4       // get的时候 key不存在
    #define REDIS_REPLY_STATUS 5   //成功状态码为："OK"  存放在char *str
    #define REDIS_REPLY_ERROR 6    //存放在char *str

redis-ERR

• err

    #define REDIS_ERR -1
    #define REDIS_OK 0
  
    #define REDIS_ERR_IO 1 /* Error in read or write */
    #define REDIS_ERR_EOF 3 /* End of file */
    #define REDIS_ERR_PROTOCOL 4 /* Protocol error */
    #define REDIS_ERR_OOM 5 /* Out of memory */
    #define REDIS_ERR_OTHER 2 /* Everything else... */

常用函数

• 连接

    redisContext* conn=redisConnect(ip,port);

• 执行命令

    redisReply* reply = redisCommand(conn,"set %s %s",key,value)

• 释放redisReply

    freeReplyObject(reply);