By Matthew MacDonald, Bill Hamilton
Written by means of specialists at the MicrosoftÂR .NET programming platform, ADO.NET in a Nutshell offers every little thing .NET programmers might want to get a jump-start on ADO.NET know-how or to sharpen their talents even extra. within the culture of O'Reilly's In a Nutshell sequence, ADO.NET in a Nutshell is the main entire and concise resource of ADO.NET info to be had. ADO.NET is the suite of knowledge entry applied sciences within the .NET Framework that builders use to construct functions providers getting access to relational information and XML. Connecting to databases is a basic a part of so much functions, whether or not they are internet, WindowsÂR, dispensed, client/server, XML internet companies, or whatever solely diverse. yet ADO.NET is considerably assorted from Microsoft's earlier info entry applied sciences - together with the former model of ADO - so even skilled builders have to comprehend the fundamentals of the hot disconnected version earlier than they begin programming with it. present with the .NET Framework 1.1, ADO.NET in a Nutshell deals one position to seem in the event you need assistance with something with regards to this crucial know-how, together with a connection with the ADO.NET namespaces and item version. as well as being a priceless reference, this ebook presents a concise beginning for programming with ADO.NET and covers various concerns that programmers face whilst constructing internet functions or internet prone that depend on database entry. utilizing C#, this ebook offers genuine international, functional examples that can assist you positioned ADO.NET to paintings instantly.
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If you perform this task before calling the same stored procedure with different parameters, you may achieve a small performance increase, depending on the provider. However, it requires an additional roundtrip to the data source, so don't use it unless you have tested it and are sure it actually provides a measurable benefit. 2 Creating and Executing a Command When creating a Command object, you have the choice of several constructors. The most useful accepts a CommandText value and a Connection.
Are easy to maintain, because they are stored separately from the application code. NET application that uses it. • Add an extra layer of indirection, potentially allowing some database details to change without breaking your code. For example, a stored procedure can remap field names to match the expectations of the client program. • Reduce network traffic, because SQL statements can be executed in batches. Of course, stored procedures aren't perfect. Most of their drawbacks are in the form of programming annoyances: • Using stored procedures in a program often involves importing additional database-specific details (such as parameter data types) into your code.
Example 5-1 shows a sample Windows application that fills a list box with the results of a query. The designer code is omitted. Example 5-1. NET objects. NET Tutorial 59 // Execute the command. ExecuteReader(); // Iterate over the results. Close(); } } } The results are shown in Figure 5-1. Figure 5-1. 1 Using Column Ordinals The previous example retrieved field values using a column name. Internally, however, the DataReader stores field information using a zero-based index. When you supply a column name, the DataReader performs a lookup in a Hashtable collection behind the scenes and then determines the appropriate ordinal.
ADO.NET in a Nutshell by Matthew MacDonald, Bill Hamilton