Windows Azure Caching: Difference between revisions

Revision as of 02:24, 13 February 2013

Revision as of 13:09, 13 February 2013

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===Code ExampleExamples===

''Note that the code samples in this section are shown in [[C_Sharp_(programming_language)|C#]].''

When hosting Caching on roles, the DataCache constructor can be used to specify both the named cache and the dataCacheClient section for the cache client settings. The following code shows these variations.

When hosting Caching on roles, the '''DataCache''' class constructor can be used to specify both the named cache and the '''dataCacheClient''' section for the cache client settings. The following code shows thesehow to create a named cache, ''NamedCache2'', using the settings from a '''dataCacheClient''' section named variations''customClient''.

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DataCache cacheCache = new DataCache("NamedCache2", "customClient");

cache = new DataCache("default");

cache = new DataCache("NamedCache1", "default");

cache = new DataCache("NamedCache2", "customClient");

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The following method shows how to use the ''Cache'' object to retrieve data from the cache. In this example, a user identifier (''userid'') is the key for the associated user information object. The code first attempts to get this user information from the cache using the ''userid'' key. If that does not succeed, the code retrieves the information with a database query and then stores the returned user data in the cache. The next time the same code is run, the user information will be returned from the cache rather than the database. This assumes that the cached data has not been expired or evicted.

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functiondataType get_fooget_user_data(intstring userid) {

/* first try the cache */

data = (dataType)cache.Get(userid) ;

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The following method shows how to update data that is already in the cache.

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functionvoid update_fooupdate_user_data(intstring userid, string dbUpdateString) {

/* first update database */

result = db_execute(dbUpdateString);

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/* database update successful : fetch data to be stored in cache */

data = db_select("SELECT * FROM users WHERE userid = ?", userid);

/* thethen previousstore linein couldcache alsoto looksupport likefuture dataget = createDataFromDBString(dbUpdateString);calls */

/* then store in cache until next get */

Cache.Put(userid, data);

}