ADO.NET in a Nutshell by Matthew MacDonald, Bill Hamilton PDF

By Matthew MacDonald, Bill Hamilton

Written via 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 abilities even extra. within the culture of O'Reilly's In a Nutshell sequence, ADO.NET in a Nutshell is the main whole and concise resource of ADO.NET details to be had. ADO.NET is the suite of information entry applied sciences within the .NET Framework that builders use to construct functions companies having access to relational facts and XML. Connecting to databases is a basic a part of such a lot purposes, whether or not they are net, WindowsÂR, dispensed, client/server, XML internet prone, or whatever fullyyt diversified. yet ADO.NET is considerably diversified from Microsoft's prior facts entry applied sciences - together with the former model of ADO - so even skilled builders have to comprehend the fundamentals of the recent disconnected version ahead of they begin programming with it. present with the .NET Framework 1.1, ADO.NET in a Nutshell deals one position to appear if you need assistance with something with regards to this crucial expertise, together with a connection with the ADO.NET namespaces and item version. as well as being a useful reference, this booklet offers a concise starting place for programming with ADO.NET and covers quite a few matters that programmers face while constructing net purposes or internet companies that depend on database entry. utilizing C#, this e-book provides genuine global, useful examples that can assist you placed ADO.NET to paintings instantly.

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Thus the first parameter you add should correspond to the first question mark in your query. Example 4-4 shows how you would approach the same task using the OLE DB provider. In this case, both Parameter objects are still assigned the same names, but these names aren't used in the query. The position alone is significant. Example 4-4. OleDb; public class UpdateRecord { public static void Main() { string connectionString = "Data Source=localhost;" + "Initial Catalog=Northwind;Provider=SQLOLEDB;" + "Integrated Security=SSPI"; string SQL = "UPDATE Categories SET CategoryName=?

NET providers do implement some form of connection pooling. In the case of the SQL Server and Oracle providers, this connection pooling mechanism is written entirely in managed code. In the case of the OLE DB and ODBC providers, this connection pooling depends on a lower level and has a few limitations. Most providers enable connection pooling automatically. However, you may be able to use connection string parameters to configure pool size settings. NET Tutorial 35 All forms of connection pooling work by examining the connection string.

However, it is now wrapped in a SQL stored procedure called UpdateCategory that requires two input parameters. The stored procedure defines the required data types for all parameters, and you should pay close attention: your code must match exactly. Example 4-5 rewrites Example 4-3 to use this stored procedure. The only two changes are found in the CommandText and CommandType properties of the Command object. Example 4-5. NET objects. Value = 1; // Execute the command. Close(); // Display the result of the operation.

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