使用hiredis提供的接口訪問redis中的ZSeT對象

一個簡單的例子,告訴用戶如何通過hiredis接口訪問ZSet對象:包括創建和訪問.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "hiredis/hiredis.h"
int main(int argc, char **argv) {
    unsigned int j;
    redisContext *c;
    redisReply *reply;
    redisReply *reply_sec;
    const char* a[10] = {"XUANXIU","kong","wukong", "YUWEN", "XUANXU", "SHUXUE", "FEIXUANXIU", "TIYU","gaoxiao","kaiwanxiao"};
    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);

    /*Create a sort set ,from 0 to 9 */
    reply = redisCommand(c,"DEL page_rank");
    for(j = 0;j < 10;j++){
        char buf[64];
        snprintf(buf,64,"%d",j);
        reply = redisCommand(c,"ZADD page_rank %s %s",buf,a[j]);
    }
    freeReplyObject(reply);

    /*Let's check what we have inside the set*/
    reply = redisCommand(c,"ZRANGE page_rank 0 -1 WITHSCORES");
    if(reply->type == REDIS_REPLY_ARRAY){
        for(j = 0 ; j< reply->elements;j++){
            printf("%s \t",reply->element[j]->str);
            reply_sec = redisCommand(c,"ZSCORE page_rank %s",reply->element[j]->str);
            printf("%s\n",reply_sec->str);
            j++;
            freeReplyObject(reply_sec);
        }
    }
    freeReplyObject(reply);

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

    return 0;
}