By Matthew MacDonald, Bill Hamilton
Written by means of specialists at the MicrosoftÂR .NET programming platform, ADO.NET in a Nutshell grants every thing .NET programmers might want to get a jump-start on ADO.NET expertise or to sharpen their abilities 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 info on hand. ADO.NET is the suite of knowledge entry applied sciences within the .NET Framework that builders use to construct purposes prone getting access to relational facts and XML. Connecting to databases is a basic a part of such a lot purposes, whether or not they are internet, WindowsÂR, disbursed, client/server, XML internet providers, or whatever solely diversified. yet ADO.NET is considerably various from Microsoft's earlier 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 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 regarding 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 origin for programming with ADO.NET and covers numerous matters that programmers face while constructing net functions or net prone that depend upon database entry. utilizing C#, this e-book offers genuine international, sensible examples that can assist you positioned ADO.NET to paintings instantly.
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Additional resources for ADO.NET in a Nutshell
The amount of time (in seconds) to wait for a command to complete before giving up and throwing an exception. The default is 30 seconds. Indicates the format used for the CommandText property. You can use Text (the default) for a SQL command, StoredProcedure for a stored procedure call, or TableDirect for one or more tables (which is a poor scalability choice because it returns all rows and columns from the named table). References the IDbConnection object to use for this command. The connection must be open before you execute the command.
Close(); } } } The results are shown in Figure 5-1. Figure 5-1. 1 Using Column Ordinals The previous example retrieved field values using a column name. Internally, however, the DataReader stores field information using a zero-based index. When you supply a column name, the DataReader performs a lookup in a Hashtable collection behind the scenes and then determines the appropriate ordinal.
If you are adding this logic to a custom data access component, you might want to raise an exception if this happens, because it indicates that no update took place. 3 Inserting a record Finally, you can insert a record using a list of column names, followed by a list of column values in the same order: INSERT INTO table (column_list) VALUES (value_list) Once again, the console example can be adapted to insert a category record just by modifying the SQL text: string SQL = "INSERT INTO Categories (CategoryName, Description) " + "VALUES ('Beverages', 'Soft drinks, coffees, teas, beers, and ales')"; Note that the category table includes a CategoryID column that is configured as a unique identity value.