我们是否可以将Can数组设置为雇用人员在Redis中的键值？

Question

给定: int x3 = {11,22,33}；如何将其作为二进制数据保存为键值并获取

雇用人员举例说明如何设置二进制安全字符串。

   /* 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);

但是其他的数据和如何获取呢？

Answer 1

在没有任何编组的情况下，直接将二进制数据存储在远程存储中是一种灾难。我不建议这样做:有很多序列化协议可以用来使二进制数据独立于平台。

尽管如此，要回答你的问题：

// This is the key
int k[3] = {11,22,33};

// This is the value
int v[4] = {0,1,2,3};
redisReply *reply = 0;

// Store the key/value: note the usage of sizeof to get the size of the arrays (in bytes)
reply = redisCommand(context, "SET %b %b", k, (size_t) sizeof(k), v, (size_t) sizeof(v) );
if (!reply)
    return REDIS_ERR;
freeReplyObject(reply);

// Now, get the value back, corresponding to the same key
reply = redisCommand(context, "GET %b", k, (size_t) sizeof(k) );
if ( !reply )
    return REDIS_ERR;
if ( reply->type != REDIS_REPLY_STRING ) {
    printf("ERROR: %s", reply->str);
} else {

    // Here, it is safer to make a copy to be sure memory is properly aligned
    int *val = (int *) malloc( reply->len );
    memcpy( val, reply->str, reply->len);
    for (int i=0; i<reply->len/sizeof(int); ++i )
        printf("%d\n",val[i]);
    free( val );
}
freeReplyObject(reply);

请注意，只有当您确信所有Redis客户端都运行在具有相同的endianness和相同大小(Int)的系统上时，此类代码才能工作。