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

By Matthew MacDonald, Bill Hamilton

Written by way of specialists at the MicrosoftÂR .NET programming platform, ADO.NET in a Nutshell supplies every little thing .NET programmers might want to get a jump-start on ADO.NET expertise 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 details to be had. ADO.NET is the suite of information entry applied sciences within the .NET Framework that builders use to construct purposes companies having access to relational facts and XML. Connecting to databases is a primary a part of such a lot functions, whether or not they are net, WindowsÂR, allotted, client/server, XML net companies, or whatever fullyyt diversified. yet ADO.NET is considerably assorted from Microsoft's past info entry applied sciences - together with the former model of ADO - so even skilled builders have to comprehend the fundamentals of the recent disconnected version prior to they begin programming with it. present with the .NET Framework 1.1, ADO.NET in a Nutshell deals one position to seem in case you need assistance with whatever relating to this crucial expertise, 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 quite a few matters that programmers face while constructing internet purposes or net providers that depend upon 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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OleDbType enumeration. SqlDbType enumeration. If the data type is a variable-length field such as a string or binary field, you also need to indicate the field length. For example, the following code snippet shows how to create a SqlParameter object named @MyParam with a SQL Server integer type. Note that the name is preceded with an @ symbol; this is a convention of stored procedure programming with SQL Server, but it is by no means a necessity in your code. Add(param); Alternatively, you can create the Parameter and add it to the Command in one step using an overloaded version of the Add( ) method.

ConnectionState enumeration. 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.

It's really a matter of convention. Different database developers have their own system for determining when to use a return value; many use a return value to provide ancillary information such as the number of rows processed or an error condition. As with input and output parameters, the return value is represented by a Parameter object. The difference is that the Parameter object for a return value must have the Direction property set to ReturnValue. , the OLE DB provider) require that the Parameter object representing the return value is the first in the Parameter collection for a Command.

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