NET Core, and configure it using Windows environment variables. Obviously there is a lot more to Redis than the simple use case I’ve described here – but hopefully this is enough to get started with how to use it to cache data in. returns "hello world" string s = dataAgent. SetStringValue( "cachedVariable", inputStringData) NET Core app and reference this project – the class below shows how. Public void DeleteStringValue( string key)įinally I can demonstrate how to use this by creating a console. Public void SetStringValue( string key, string value) Public string GetStringValue( string key) Now that I have a connection factory, it’s very simple to create a class which acts as an agent to allow me to read, write and delete string values from the Redis database. Public static ConnectionMultiplexer GetConnection() => Connection. Parse(connectionString) Ĭonnection = new Lazy(() => ConnectionMultiplexer. I added these in the project.json file using the code below, and restored the packages using “dotnet restore”. Once this project is created, I need to add a couple of libraries – the StackExchange.Redis library, and. I know we could set expiration on individual keys using IDatabase.KeyExpire method, but I'm looking for some sort of configuration that applies to all the keys. And also I should be able to override the expiration duration on individual keys. NET Core project – I’ve called mine RedisAPI. I need to set the default key expiration value for all the keys globally. NET Core project and class to connect to Redisįirst we simply create a new. ::SetEnvironmentVariable("REDIS_CONNECTIONSTRING", "localhost", "Machine") Step 3: Create the. I’ve previously written about this technique. So I’ll create an environment variable called “REDIS_CONNECTIONSTRING” with this value. The simplest connection string is really simple – it’s just “localhost”. Step 2: Create an environment variable to connect to Redis This process will also install a Windows service for the Redis database. This is a fairly simple and straightforward installer – there were a few decision points, such as adding the installation directory to the machine’s pathĪlso you can choose which port that Redis runs on – 6379 is usually used for non-SSL access, or 6380 for SSL. (You should read the information on this site to determine the if this is best version for you). I downloaded the latest installer for the Windows version of Redis from here. This post is about how I started (from a point of knowing nothing about Redis or how to use it), up to the point where I was able to read and write values through a. NET applications, and I decided to try out the Redis NoSQL server. It should also be noted that many common scenarios (in particular: key/hash existence, like in the above) have been anticipated by Redis, and single-operationĪtomic commands exist.I’ve been interested in using caching to improve the performance of my. But I need to delete all keys that containing some prefix. Now I want to delete all keys that having prefix 'KeyPrefix' How it posible as in my code I can delete only matching key. There are additional conditions that you would like to see. Now there is a situation that cache is dynamically generate like 'KeyPrefix'+i i is a dynamic value. The set of available conditions is not extensive, but covers the most common scenarios please contact me (or better: submit a pull-request) if Will be marked as cancelled - otherwise, after the command has executed you can fetch the results of each as normal. If the operations are not applied, all the Tasks Note that the object returned from CreateTransaction only has access to the async methods - because the result ofĮach operation will not be known until after Execute (or ExecuteAsync) has completed. Execute () // ^^^ if true: it was applied if false: it was rolled back HashSetAsync ( custKey, "UniqueID", newId ) bool committed = tran. HashNotExists ( custKey, "UniqueID" )) tran. Var newId = CreateNewId () var tran = db. This is all done in a way that prevents the commands being Pass, the MULTI/ EXEC is issued otherwise UNWATCH is issued. Constraints areīasically pre-canned tests involving WATCH, some kind of test, and a check on the result. SoĪn additional abstraction is provided - additionally making things simpler to get right: constraints. Let concurrent callers issue WATCH / UNWATCH / MULTI / EXEC / DISCARD: it would all be jumbled together. This is further complicated by the fact that StackExchange.Redis uses a multiplexer approach. BeginTran ()) from all other connections - if anyone elseĬhanges the key, the transaction will be aborted. assign a new unique id only if they don't already // have one, in a transaction to ensure no thread-races var newId = CreateNewUniqueID () // optimistic using ( var tran = conn.
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