By Matthew MacDonald, Bill Hamilton
Written via specialists at the MicrosoftÂR .NET programming platform, ADO.NET in a Nutshell grants 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 info 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 so much purposes, whether or not they are internet, WindowsÂR, allotted, client/server, XML net prone, or anything solely diverse. 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 prior to they begin programming with it. present with the .NET Framework 1.1, ADO.NET in a Nutshell bargains one position to appear in the event you need assistance with something regarding this crucial know-how, together with a connection with the ADO.NET namespaces and item version. as well as being a worthwhile reference, this ebook presents a concise origin for programming with ADO.NET and covers numerous concerns that programmers face whilst constructing net functions or net providers that depend upon database entry. utilizing C#, this e-book provides actual global, functional examples that can assist you positioned ADO.NET to paintings instantly.
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Additional resources for ADO.NET in a Nutshell
If you want to replace a row you deleted in the previous example, you can manually specify a CategoryID with the value of 1). 2 Executing a Command That Returns a Single Value ExecuteScalar( ) method returns a single value. If you perform a query, this will be the first value in the first column of the first row. More likely, you'll use ExecuteNonQuery( ) to return an aggregate value, which is the result of a calculation using a subset of rows. An aggregate function must be part of a SQL SELECT statement, which indicates the table and (optionally) a search filter and sort order: SELECT aggregate_expression FROM tables [WHERE search_condition] [ORDER BY order_expression ASC | DESC] Example 4-2 shows how an aggregate command can retrieve the total number of orders for the year 1996.
2 Output Parameters One common use of a stored procedure is to insert a record in a table that uses a unique identity field. NET code. This saves you re-querying the database to find this information. The Northwind sample database doesn't use this technique; the database used by the IBuySpy e-commerce store does. com site or just refer to the following example. Here is the CustomerAdd stored procedure code in the store database: CREATE Procedure CustomerAdd ( @FullName nvarchar(50), @Email nvarchar(50), @Password nvarchar(50), @CustomerID int OUTPUT ) AS INSERT INTO Customers ( FullName, EMailAddress, Password ) VALUES ( @FullName, @Email, @Password ) SELECT @CustomerID = @@Identity GO This stored procedure defines three input parameter and one output parameter for the generated ID.
NET. Typically, the Command object wraps a SQL statement or a call to a stored procedure. For example, you might use a Command object to execute a SQL UPDATE, DELETE, INSERT, or SELECT statement. NET providers that don't represent databases may use their own nomenclature. CommandText property, which defines the command, must be a string. As with the Connection object, the Command object is specific to the data provider. 0 or later. OleDbCommand executes commands against an OLE DB data provider.
ADO.NET in a Nutshell by Matthew MacDonald, Bill Hamilton