c# data matrix generator DATA ACCESS LAYER SERVICES in C#.NET

Encoder Data Matrix in C#.NET DATA ACCESS LAYER SERVICES

CHAPTER 11 DATA ACCESS LAYER SERVICES
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// Create and use an XML reader to navigate the customer data XmlReader xmlReader = customerXml.CreateReader(); xmlReader.Read(); Console.WriteLine(xmlReader.ReadOuterXml()); } } } This example leverages the SqlXml.CreateReader method to retrieve an XmlReader, which is one of the common ways to read XML. In this particular case, however, it proves to be overkill since the next two lines of code simply write the entire XML content as one large string. You can achieve this more easily using the SqlXml.Value property, which returns the XML content as a string. In general, ADO.NET 2.0 provides many ways to navigate, convert, read, and write XML data types. The overall combination of the ADO.NET SqlXml type, enhancements in the SQL Server data provider, and the tight data engine integration provided by the SQL Server XML data type promises to unify XML and relational data like never before. This, in turn, should accelerate the adoption of XML as the most common mechanism to represent business oriented data.
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Summary
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You have a lot of choices for putting a data access layer together. Some are useful in more situations than others. Data source controls are useful in some circumstances, while the Data Access Application Block is a likely boon to just about any application of decent size. Cache dependencies are a very powerful facility that can be leveraged to super-charge performance of applications in many situations that have historically been very difficult to address. SQL Server 2005 introduces a new era in relational database technology by providing an integrated asynchronous messaging system, hosting the CLR in the same process as the database engine, and treating XML as a first class data type. Taken individually, these are powerful new features. Taken together, however, these features elevate SQL Server 2005 from a database to an application platform in its own right. Personally, we re excited to see how innovative developers will combine these features to elegantly address problems that have traditionally been daunting.
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CHAPTER
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Transactions
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irtually all business applications require some level of transaction support. You can largely maintain data integrity in a static view using the rules of schema that a relational database provides. In dynamic processes, however, a transaction can guarantee that all or none of the changes applied during the process are persisted when the process is complete. ACID properties (atomicity, consistency, isolation, and durability) are the cornerstone of any transaction infrastructure. In 7, you saw the attribute-based transactional behavior of Enterprise Services provided by COM+. These transactions are specific to a database, and it s common to think of work done with a database whenever you re considering transactions. Transactional behavior can be supplied for any resource, however, be it an in-memory hash table, a file on the disk, or an XML document. One of the design goals of the transactional engine built into version 2.0 of the .NET Framework is to make creating these resource managers much easier for any type of resource you want to participate in a transaction. The problem with COM+ transactions is that they rely on the Distributed Transaction Coordinator (DTC), which is a feature-rich transactional engine, but those features come at a price. The DTC consumes a lot of resources and can introduce a performance penalty to your application. This is fine when transactional work occurs across relational database systems, but it can be a large price to pay if the transaction is isolated to a single database. For a single database, you re better off using T-SQL Transactions, or ADO.NET connection-based transactions. Another benefit of the transactional system in COM+ is the capability to dynamically compose transactions. An atomic method can be declared as requiring a transaction context. Sometimes you call that method on its own, where an ADO.NET transaction would completely suffice. Sometimes, however, you call that method as a step of a larger transaction, one in which you may need the distributed services of the DTC. Ideally the transaction would use the less-expensive resource manager of ADO.NET, and the transaction context would recognize when the services of a more robust resource manager such as the DTC were needed, and then automatically promote the transaction and enlist the more resource intensive manager. This automatic transaction promotion is the second big design goal of transactions in .NET 2.0.
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