By Matthew MacDonald, Bill Hamilton
Written by way of specialists at the MicrosoftÂR .NET programming platform, ADO.NET in a Nutshell gives you every 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 knowledge entry applied sciences within the .NET Framework that builders use to construct purposes providers getting access to relational facts and XML. Connecting to databases is a primary a part of so much purposes, whether or not they are internet, WindowsÂR, disbursed, client/server, XML internet providers, or whatever fullyyt diversified. yet ADO.NET is considerably diverse from Microsoft's earlier information entry applied sciences - together with the former model of ADO - so even skilled builders have to comprehend the fundamentals of the recent disconnected version sooner than they begin programming with it. present with the .NET Framework 1.1, ADO.NET in a Nutshell deals one position to appear 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 necessary reference, this ebook presents a concise origin for programming with ADO.NET and covers various concerns that programmers face while constructing internet purposes or net providers that depend on database entry. utilizing C#, this booklet provides actual global, useful examples to help you positioned ADO.NET to paintings instantly.
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Extra resources for ADO.NET in a Nutshell
Execute the Command with the ExecuteNonQuery( ), ExecuteScalar( ), or ExecuteQuery( ) method (depending on the type of output generated by the stored procedure). For example, consider the generic update command defined earlier: UPDATE Categories SET CategoryName=@CategoryName WHERE CategoryID=@CategoryID You can encapsulate this logic in a stored procedure quite easily. NET Tutorial but the actual stored procedure code will look something like this: CREATE PROCEDURE UpdateCategory ( @CategoryID int, @CategoryName nvarchar(15) ) AS UPDATE Categories SET CategoryName=@CategoryName WHERE CategoryID=@CategoryID GO You'll notice that the actual SQL statement is unchanged.
Similarly, a change in security information (for example, the user account and password) or the location of the database server would cause problems if connections were reused indiscriminately. • If no pool exists, it is created the first time you call Open( ). Depending on connection string settings, the pool may be initially populated with a set number of connections, or it may be limited to a certain maximum number. 1 SQL Server and Oracle Connection Pooling With SQL Server, Oracle, and MSDE, connection pooling is implemented by the managed provider, unless you have specifically disabled it with a connection string parameter.
The code opens the connection, tests its state, and closes it. NET Tutorial Example 3-1. 1 Connection Events Connection objects expose only two events. The InfoMessage event can retrieve warnings and other messages from a data source. Generally, you use this event if you wish to receive specific information messages that don't correspond to errors (in SQL Server, these are messages with a severity of 10 or less). You can't use this event to be informed about errors, which simply causes the Connection object to throw an exception.
ADO.NET in a Nutshell by Matthew MacDonald, Bill Hamilton