Question

First, a link to the library: ServiceStack.Redis

Now, I want to store objects of type T where T contains fields Key and Value. (for this example)

The issue is that it seems like I can only store strings as both keys and values. As far as a string key, thats perfectly fine, but I need to store an object as the value.

Attached is my code which supports to map Hash -> KeyValuePair items

public void PutDictionary(string hashKey, Dictionary<string, T> items, TimeSpan expiration)
{
    try
    {
        using (var trans = _client.CreateTransaction())
        {
            foreach (KeyValuePair<string, T> item in items)
            {
                trans.QueueCommand(r => r.SetEntryInHash(hashKey, item.Key, ???));
            }

            trans.Commit();
        }
    }
    catch (Exception e)
    {
        // some logic here..
    }
}

Im aware that I can just JSON stringify my objects but it seems like this just consumes a very much needed performance and losing the effect of good-fast cache memory.

Ill explain what I want to achieve. Lets say I have a group and peoples in it. The group has an Id and each entity inside this group also has an Id. I want to be able to get a specific person from a specific group.

In C# its equivilant of doing Dictionary<string, Dictionary<string, T>>

Answer 1

您应该将值对象序列化为字符串。在Redis中没有存储对象的概念，当ServiceStack.Redis为其提供Typed API时，它只需将后台的对象序列化为JSON并将JSON字符串发送到Redis的。

ServiceStack.Redis还提供了StoreAsHash(T)和SetRangeInHash等API，其中对象属性存储在Redis Hash中，但是在这种情况下，您需要存储嵌套的Hash，以便值可以＆＃ 39;是另一个Redis Hash。

你可以允许另一个＆＃34;嵌套词典＆＃34;通过将对象保存在将hashKey与Dictionary键组合在一起的自定义键，例如：

foreach (var entry in items) {
    var cacheKey = hashKey + ":" + entry.Key;
    var mapValues = entry.Value.ToJson()
        .FromJson<Dictionary<string,string>>();
    redis.SetRangeInHash(cacheKey, mapValues);
}

C# ServiceStack.Redis store objects in hashmap

1 个答案: