void hmgetCommand(client *c) {
    robj *o;
    int i;

    /* Don't abort when the key cannot be found. Non-existing keys are empty
     * hashes, where HMGET should respond with a series of null bulks. */
    o = lookupKeyRead(c->db, c->argv[1]);
    if (o != NULL && o->type != OBJ_HASH) {
        addReply(c, shared.wrongtypeerr);
        return;
    }

    addReplyArrayLen(c, c->argc-2);
    for (i = 2; i < c->argc; i++) {
        addHashFieldToReply(c, o, c->argv[i]->ptr);
    }
}
void hmgetCommand(client *c) {
    robj *o;
    int i;

     
    o = lookupKeyRead(c->db, c->argv[1]);
    if (o != NULL && o->type != OBJ_HASH) {
        addReply(c, shared.wrongtypeerr);
        return;
    }

    addReplyArrayLen(c, c->argc-2);
    for (i = 2; i < c->argc; i++) {
        addHashFieldToReply(c, o, c->argv[i]->ptr);
    }
}