By Matthew MacDonald, Bill Hamilton
Written by means of specialists at the MicrosoftÂR .NET programming platform, ADO.NET in a Nutshell promises every little thing .NET programmers might want to get a jump-start on ADO.NET know-how or to sharpen their talents even additional. 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 details on hand. ADO.NET is the suite of information entry applied sciences within the .NET Framework that builders use to construct purposes prone having access to relational information and XML. Connecting to databases is a basic a part of so much purposes, whether or not they are internet, WindowsÂR, dispensed, client/server, XML net prone, or whatever totally various. yet ADO.NET is considerably varied from Microsoft's prior 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 sooner than they begin programming with it. present with the .NET Framework 1.1, ADO.NET in a Nutshell bargains one position to seem if you happen to need assistance with something concerning this crucial expertise, together with a connection with the ADO.NET namespaces and item version. as well as being a worthy reference, this booklet offers a concise starting place for programming with ADO.NET and covers a number of concerns that programmers face while constructing net purposes or internet companies that depend on database entry. utilizing C#, this e-book provides actual global, functional examples that can assist you placed ADO.NET to paintings instantly.
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Extra info for ADO.NET in a Nutshell
The stored procedure begins by inserting the new record and sets the output parameter using the special global SQL Server system function @@Identity. Using this routine in code is just as easy, but you need to configure the @CustomerID parameter to be an output parameter (input is the default) (see Example 4-6). Example 4-6. cs - Runs the CustomerAdd stored procedure. NET objects. SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(procedure, con); // Configure command and add input parameters.
Currently, the StateChange event fires only when the connection is opened or closed (not to inform you about other ConnectionState values), which reduces its usefulness dramatically. 2 Connections and Exception Handling Exception handling is critical when accessing an external resource such as a database, as you can't guarantee the success of your operations. Problems such as a heavy user load, a misbehaving network connection, or invalid connection string parameters can derail your attempts to use or open a connection.
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. You can control this problem by creating a dedicated component that encapsulates all your data access code. • Stored procedures are created entirely in the SQL language (with variations depending on the database vendor) and use script-like commands that are generally more awkward than a full-blown object-oriented language such as C"docText">Stored procedures can be used for any database task, including retrieving rows or aggregate information, updating data, and removing or inserting rows.
ADO.NET in a Nutshell by Matthew MacDonald, Bill Hamilton