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ADO.NET is the latest in a long line of Microsoft data-access technologies spanning a good ten years with the same aim in mind: to make database access as easy and as painless as possible for anyone who needs that facility. Back in the late 1980s and beginning of the 1990s, database server vendors all faced the same problem. A lot of third-party vendors wanted to build products backed by a database but didn t want to be limited to using just one database. They wanted to keep the product as generic as possible so customers could use their application backed by their database of choice. The problem was that every database had its own way to access the data inside it, so a third-party vendor had to write new code each time it wanted to support a new database. The solution the database vendors came up with was called Open Database Connectivity (ODBC). This is a common set of functions and interfaces agreed upon by all the major database vendors at that time to be implemented by all their servers. Third-party vendors needed to write code only against ODBC methods to access a database, and it would then work against any database that supported ODBC, which they all did. The third-party vendors were happy because the size of their products was reduced quite dramatically, and they all worked against every ODBC database. The database vendors were happy because third-party products worked against their database servers, and they could charge the third parties license fees. Everyone s

customers were happy because of the increase in competition, product, and, well, wasn t it nice when everyone played nicely with everyone else ODBC was extremely successful and is still supported by all the major database servers in use today However, one thing you can t call it is simple to use ODBC works at quite a low level In context, if your program spoke English, you would need to train yourself to write code in the Swahili that ODBC spoke when you wanted to access a database Microsoft saw this problem and attempted to fix it by creating OLE DB, a set of Component Object Model (COM) components designed for Windows developers OLE DB makes accessing data a bit simpler more Spanish than Swahili, so still not English, but easier to learn It also doesn t presuppose that the data source is a database, as ODBC does.

$ svn list file:///path/to/repository/trunk/

element: Defines the guts of the application that the manifest describes. Here s an example:

OLE DB was pretty successful and is still supported by several vendors including Microsoft, which decided that OLE DB would be the cornerstone for its Universal Data Access (UDA) strategy One of the aims of UDA was to bring an object-oriented interface to ODBC and OLE DB, which were procedural in nature more C than C++ or Visual Basic (VB) Its first attempts Data Access Objects (DAO) and Remote Data Objects (RDO) were designed to work against Access and larger databases such as SQL Server and Oracle, respectively However, ADO version 20 superseded both of these in 1998 ADO is a technology originally designed to give classic ASP pages a way to access databases ADONET now takes over from ADO Like its predecessor, ADO.

foo.c bar.c main.c new-directory/

NET gives you the ability to work with a data source through a common set of methods and interfaces, regardless of whether it supports ODBC, OLE DB, or its own proprietary access solution This is achieved through a set of data providers, which are described in the next section ADONET also provides better support for the following: Working with data away from the database itself or, rather, pulling information onto the Web server and working with it there instead of on the database server This method of using disconnected data can improve performance if used wisely The database when it is under attack from a large number of simultaneous queries Stability and performance have been significantly improved in ADONET compared to ADO Binding information to any control on the page, as you ll see in 6 Strictly speaking, this is more an ASPNET feature than an ADO.

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.commonsware.android"> <uses-permission android:name="android.permission.ACCESS_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_GPS" /> <uses-permission android:name="android.permission.ACCESS_ASSISTED_GPS" /> <uses-permission android:name="android.permission.ACCESS_CELL_ID" /> <application> ... </application> </manifest>

NET feature, but it s an important capability when you re creating data-driven Web sites With the introduction of the data source controls in ASPNET 20 (discussed a little later in this chapter), it has become even easier to write data-aware pages than ever before..

In this example, the manifest has elements to indicate some device capabilities the application will need in this case, permissions to allow the application to determine its current location. The contents of the element will describe the activities, services, and whatnot that make up the bulk of the application itself. Permissions will be covered in greater detail in 28.

$ svn list file:///path/to/repository/trunk/new-directory/