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At first glance, it might seem that ADONET offers a fragmented model, because it doesn t include a generic set of objects that can work with multiple types of databases As a result, if you change from one RDBMS to another, you ll need to modify your data access code to use a different set of classes But even though different NET data providers use different classes, all providers are standardized in the same way More specifically, each provider is based on the same set of interfaces and base classes For example, every Connection object implements the IDbConnection interface, which defines core methods such as Open() and Close() This standardization guarantees that every Connection class will work in the same way and expose the same set of core properties and methods Behind the scenes, different providers use completely different low-level calls and APIs.

For example, the SQL Server provider uses the proprietary TDS (Tabular Data Stream) protocol to communicate with the server The benefits of this model aren t immediately obvious, but they are significant: Because each provider uses the same interfaces and base classes, you can still write generic data access code (with a little more effort) by coding against the interfaces instead of the provider classes You ll see this technique in action in the section Provider-Agnostic Code Because each provider is implemented separately, it can use proprietary optimizations (This is different from the ADO model, where every database call needs to filter through a common layer before it reaches the underlying database driver) In addition, custom providers can add nonstandard features that aren t included in other providers (such as SQL Server s ability to perform an XML query) ADONET also has another layer of standardization: the DataSet.

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When the startService command is issued on this Service, the onStartCommand method will be triggered. In this method, we first check that the MediaPlayer object isn t already playing, as this method may be called multiple times, and if it isn t, we start it. Since we are using the onStartCommand method rather than the onStart method, this example runs only in Android 2.0 and above.

The DataSet is an all-purpose container for data that you ve retrieved from one or more tables in a data source The DataSet is completely generic in other words, custom providers don t define their own custom versions of the DataSet class No matter which data provider you use, you can extract your data and place it.

void IResourceWriter.Generate() { // Get the current virtual path string vPath = GetVirtualPath(_provider); // Writes back to the database foreach (object k in Resources.Keys) { // For simplicity: we have just strings // in our simple sample implementation _db.AddResource(vPath, k.ToString(), Resources[k].ToString(), null); } } Visual Studio calls the methods you see in the previous code mainly when you select Tools Generate Local Resource. For every localizable property of each control on the page, Visual Studio first calls the CreateResourceKey method for generating a unique key used in the meta:resourceKey attribute as well as in the database to identify the resource. Afterward, it calls one of the AddResource methods (depending on the type of the property), passing in the previously generated key for adding the resource to the resource dictionary. Finally, when Visual Studio goes through all controls and localizable properties, it calls the Generate method of the resource writer to write the resource entries to the database. The previous implementation again uses the previously introduced helper class SimpleSqlResourceDatabaseHelper to add the entries to the database. The resources dictionary is accessed through a Resources property of the class for convenience. The actual key generation happens in the GetNextKeyIndex method called by CreateResourceKey. You can see the missing bits of the code in the following snippet: private int GetNextKeyIndex(string key, int counter) { // Go through the existing items and verify whether the key is used foreach (string k in Resources.Keys) { if (k.IndexOf(string.Format("{0}{1}", key, counter)) >= 0) { counter = GetNextKeyIndex(key, counter + 1); } } return counter; } private ListDictionary _Resources = null; private ListDictionary Resources { get { if (_Resources == null) { _Resources = _db.GetResources("none", GetVirtualPath(_provider)); if (_Resources == null) _Resources = new ListDictionary(); } return _Resources; } }

public void save(User user) { userDao.saveOrUpdate(user); mailDao.sendConfirmationEmail(user); } public setMailDao(MailDao mailDao) { this.mailDao = mailDao } public setUserDao ( UserDao userDao) { this. userDao = userDao } }

@Override public int onStartCommand(Intent intent, int flags, int startId) { Log.v("PLAYERSERVICE","onStartCommand"); if (!mediaPlayer.isPlaying()) { mediaPlayer.start(); } return START_STICKY; }

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