Getting Started with DB2 Express-C

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252 Getting Started with DB2 Express-C Microsoft SQL server data sources using the ODBC driver but does not guarantee full functionality of the OLE DB driver. 14.3.6 ADO.NET The .NET Framework is the Microsoft replacement for Component Object Model (COM) technology. Using the .NET Framework, you can code .NET applications in over forty different programming languages; the most popular ones being C# and Visual Basic .NET. The .NET Framework class library provides the building blocks with which you build .NET applications. This class library is language agnostic and provides interfaces to operating system and application services. Your .NET application (regardless of language) compiles into Intermediate Language (IL), a type of bytecode. The Common Language Runtime (CLR) is the heart of the .NET Framework, compiling the IL code on the fly, and then running it. In running the compiled IL code, the CLR activates objects, verifies their security clearance, allocates their memory, executes them, and cleans up their memory once execution is finished. As an analogy to how Java works, in Java, a program can run in multiple platforms with minimal or no modification: one language, but multiple platforms. In .NET, a program written in any of the forty supported languages can run in one platform, Windows, with minimal or no modification: multiple languages, but one platform. ADO.NET is how data access support is provided in the .NET Framework. ADO.NET supports both connected and disconnected access. The key component of disconnected data access in ADO.NET is the DataSet class, instances of which act as a database cache that resides in your application's memory. For both connected and disconnected access, your applications use databases through what is known as a data provider. Various database products include their own .NET data providers, including DB2 for Windows. A .NET data provider features implementations of the following basic classes: • Connection: establishes and manages a database connection. • Command: executes an SQL statement against a database. • DataReader: reads and returns result set data from a database. • DataAdapter: links a DataSet instance to a database. Through a DataAdapter instance, the DataSet can read and write database table data. Three data providers that can work with DB2 are shown in Table 14.3 Data Provider ODBC .NET Data provider (not recommended) Characteristics • Makes ODBC calls to a DB2 data source using the DB2 CLI driver. • It has same keyword support and restrictions as that
Chapter 14 - Introduction to DB2 Application Development 253 of DB2 CLI driver • Can be used with .NET Framework Version 1.1, 2.0, or 3.0. OLE DB .NET Data provider (not recommended) • Uses IBM DB2 OLE DB Driver (IBMDADB2). • It has same keyword support and restrictions as that of DB2 OLE DB driver • Can be used only with .NET Framework Version 1.1, 2.0, or 3.0. DB2 .NET Data provider (recommended) • Extends DB2 support for the ADO.NET interface. • The DB2 managed provider implements the same set of standard ADO.NET classes and methods Table 14.3 - ADO.NET data providers 14.3.7 PHP • It is defined under IBM.DATA.DB2 namespace. • Can be obtained by downloading any of: - Data Server Driver for ODBC, CLI, and .NET - IBM Data Server Runtime Client - DB2 Data Server PHP Hypertext Preprocessor (PHP) is an open source, platform independent scripting language designed for Web application development. It can be embedded within HTML, and generally runs on a Web server which takes the PHP code and creates Web pages as output. PHP is a modular language. You can use extensions to customize the available functionality. Some of the most popular PHP extensions are those used to access databases. IBM supports access to DB2 databases through two extensions: • ibm_db2: The ibm_db2 extension offers a procedural application programming interface to create, read, update and write database operations in addition to extensive access to the database metadata. It can be compiled with either PHP 4 or PHP 5. • pdo_ibm: The pdo_ibm is a driver for the PHP Data Objects (PDO) extension that offers access to DB2 database through the standard object-oriented database interface introduced in PHP 5.1. It can be compiled directly against DB2 libraries.
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GETTING STARTED WITH DB2 Express-C
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Contents About this book ..........
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Contents 7 6.3 DB2 storage model ..
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Contents 9 13.4.2 Cursor stability
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About this book Notices and tradema
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About this Book 13 A book for the c
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About this Book 15 Foreword Innovat
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1 Chapter 1 - What is DB2 Express-C
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Chapter 1 - What is DB2 Express-C?
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1.8 Moving up to another DB2 editio
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30 Getting Started with DB2 Express
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4 Chapter 4 - DB2 Environment The D
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Chapter 4 - DB2 Environment 69 conf
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Chapter 4 - DB2 Environment 73 Tabl
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6 Chapter 6 - DB2 Architecture In t
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8 Chapter 8 - Working with Database
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9 Chapter 9 - Data Movement Utiliti
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Chapter 9 - Data Movement Utilities
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11 Chapter 11 - Backup and Recovery
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