查询数据顶点时出错

Question

    public static void findAll(Handler<AsyncResult<ChannelInfo[]>> ar)
{
    //getConnection().query("SELECT &", arg1)
    getConnection().queryWithParams("SELECT * FROM Servers", new JsonObject(), res -> {
        if (res.succeeded() && res.result().size() > 0) {
            ChannelInfo[] channels = new ChannelInfo[res.result().size()];
            int count = 0;

            for (JsonObject row : res.result()) {
                channels[count++] = new ChannelInfo()
                    .setId(row.getInteger("srv_id"))
                    .setName(row.getString("srv_name"))
                    .setIp(row.getString("srv_ip"))
                    .setServerDomain(row.getString("srv_domain"))
                    .setPort(row.getInteger("srv_port"))
                    .setPosition(row.getInteger("srv_position"))
                    .setPromiseToFightFlag(row.getBoolean("srv_promise_to_fight_flag"))
                    .setMoreServerFlag(row.getBoolean("srv_more_server_flag"))
                    .setMaxRoom(row.getInteger("srv_max_room"))
                    .setNumber(row.getInteger("srv_number"))
                    .setAllowedRoomTypeId(row.getInteger("srv_allowed_room_type_id"))
                    .setLimitMinLV(row.getInteger("srv_limit_min_lv"))
                    .setLimitMaxLV(row.getInteger("srv_limit_max_lv"))
                    .setMaxClient(row.getInteger("srv_max_client"));
            }

            ar.handle(Future.succeededFuture(channels));
        } else {
            logger.error("Erro ao obter um usuário pelo nome", res.cause());
            ar.handle(Future.failedFuture(res.cause()));
        }
    });
}

错误：SQLConnection 类型中的方法 queryWithParams(String, JsonArray, Handler>) 不适用于参数 (String, JsonObject, ( res) -> {})

Answer 1

替换...

getConnection().queryWithParams("SELECT * FROM Servers", new JsonObject(), res ...

...与：

getConnection().queryWithParams("SELECT * FROM Servers", new JsonArray(), res ...

方法 queryWithParams 需要以下参数：

查询字符串
查询参数
处理响应的处理程序

第二个参数必须是 JsonArray 而不是 JsonObject。在您的情况下，您似乎没有传递任何参数，因此提供一个空的 JsonArray（例如 new JsonArray()）就足够了。

查询数据顶点时出错

Error while querying data vertx

vert.x