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Even with the advent of the new data binding model, the underlying ADONET reality doesn t change that much Many of the changes are internal (such as a more compact DataSet serialization format that requires less memory) or involve frills that aren t of much use in the average web application (such as the new SQL bulk copy feature for rapidly transferring an entire table between two database servers) Several more features were cut during the NET 20 beta cycle (such as built-in paging support for getting part of the results of a query, the ObjectSpaces system for object mapping, and the XmlAdapter class for more powerful DataSet-to-XML conversions, to name just a few) These may turn up again in separate toolkits or later versions of NET, but for now developers are out of luck So, what does that leave us with Here are some genuinely interesting ADO.

surfaceHolder = cameraView.getHolder(); surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); surfaceHolder.addCallback(this); cameraView.setFocusable(true); cameraView.setFocusableInTouchMode(true); cameraView.setClickable(true); cameraView.setOnClickListener(this); } public void onClick(View v) { camera.takePicture(null, null, this); }

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NET changes that are still around: Provider factories: The dream of generic data access code (code you can write once and use with multiple different databases) takes a giant leap forward in NET 20 thanks to provider factories new components that can create strongly typed Connection, Command, and DataAdapter objects on the fly You ll learn about them in this chapter Change notification: To build truly scalable web applications, you need to cache data that s retrieved from a database so it can be reused without connecting to the data source each time However, caching introduces the possibility of out-of-date information ADONET includes a new change notification feature that you can use to automatically remove cached data when the related records in the database change You ll learn about this feature in 11.

Connection statistics: It s a small frill, but the new connection-tracking features of the SqlConnection object might help you profile different data access strategies They re introduced in this chapter SQL Server 2005: SQL Server 2005 introduces a whole set of new features, and ADONET 20 supports them seamlessly These features include user-defined data types that are based on NET classes, as well as stored procedures written with NET languages For more information about these features, refer to a dedicated SQL Server 2005 book such as A Developer's Guide to SQL Server 2005 (Addison-Wesley, 2006) or Pro SQL Server 2005 Assemblies (Apress, 2005)..

public void onPictureTaken(byte[] data, Camera camera) { Uri imageFileUri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, new ContentValues()); try { OutputStream imageFileOS = getContentResolver().openOutputStream(imageFileUri); imageFileOS.write(data); imageFileOS.flush(); imageFileOS.close(); } catch (FileNotFoundException e) { Toast t = Toast.makeText(this,e.getMessage(), Toast.LENGTH_SHORT); t.show(); } catch (IOException e) { Toast t = Toast.makeText(this,e.getMessage(), Toast.LENGTH_SHORT); t.show(); } camera.startPreview(); }

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ADO.NET uses a multilayered architecture that revolves around a few key concepts, such as Connection, Command, and DataSet objects. However, the ADO.NET architecture is quite a bit different from previous data access technologies such as classic ADO. One of the key differences between ADO and ADO.NET is how they deal with the challenge of different data sources. In ADO, programmers always use a generic set of objects, no matter what the underlying data source is. For example, if you want to retrieve a record from an Oracle database, you use the same Connection class you would use to tackle the same task with SQL Server. This isn t the case in ADO.NET, which uses a data provider model.

A data provider is a set of ADO.NET classes that allows you to access a specific database, execute SQL commands, and retrieve data. Essentially, a data provider is a bridge between your application and a data source. The classes that make up a data provider include the following:

Connection: You use this object to establish a connection to a data source. Command: You use this object to execute SQL commands and stored procedures. DataReader: This object provides fast read-only, forward-only access to the data retrieved from a query. DataAdapter: This object performs two tasks. First, you can use it to fill a DataSet (a disconnected collection of tables and relationships) with information extracted from a data source. Second, you can use it to apply changes to a data source, according to the modifications you ve made in a DataSet. ADO.NET doesn t include generic data provider objects. Instead, it includes different data providers specifically designed for different types of data sources. Each data provider has a specific implementation of the Connection, Command, DataReader, and DataAdapter classes that s optimized for a specific RBDMS (relational database management system). For example, if you need to create a connection to a SQL Server database, you ll use a connection class named SqlConnection.

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { camera.startPreview(); } public void surfaceCreated(SurfaceHolder holder) { camera = Camera.open(); try { camera.setPreviewDisplay(holder); Camera.Parameters parameters = camera.getParameters(); if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) { parameters.set("orientation", "portrait"); // For Android Version 2.2 and above camera.setDisplayOrientation(90); // For Android Version 2.0 and above parameters.setRotation(90); }

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