Method append

src/RedisView/RedisLib/RedisClient.cpp:690–719

* 如果key已经存在并且是一个字符串，APPEND命令将value追加到key原来的值的末尾 * 如果key不存在，APPEND就简单地将给定key设为value，就像执行SET key value一样 * @param[in] key 一个或多个键 * @param[in] value 追加的值 * @return 追加value之后，key中字符串的长度 * @see * @note */

 * @note
 */
qlonglong RedisClient::append(const QString & key, const QString & value) {
    _sErrorInfo.clear();
    if(key.trimmed().isEmpty()) {
        _sErrorInfo = "key is empty";
        return false;
    }

    _vCmdList.clear();
    _vCmdList.push_back("APPEND");
    _vCmdList.push_back("key");
    _vCmdList.push_back(value);

    _cmdResult = command(_vCmdList);
    if(_cmdResult[0] == '-') {
        if(parseRespError(_cmdResult,_sValue))
            _sErrorInfo = _sValue;
        else
            _sErrorInfo = "parser resp error info failed";
        _llRet = 0;
    } else if(_cmdResult[0] == ':') {
        if(!parseRespInteger(_cmdResult,_llRet)) {
            _sErrorInfo = "parser resp integer info failed";
            _llRet = 0;
        }
    } else {
        _bRet = false;
        _sErrorInfo = QString("parser resp type failed:") + _cmdResult[0];
    }
    return _llRet;
}

/**
 * 返回当前数据库的key的数量