By Jason Lefebvre
ADO.NET is the information entry version equipped into the .NET Framework. It replaces the previous (and mostly profitable) ADO utilized in just about all visible uncomplicated and ASP purposes outfitted over the past few years. ADO.NET allows an program to speak with any OLE database resource (including Oracle, Sybase, Microsoft entry, or even textual content files). This booklet will current ADO.NET in an easy, effortless -to-learn demeanour packed with many code examples and routines. A reader without earlier wisdom of ADO.NET can be capable of learn this booklet and feature a useful wisdom of latest item version permitting them to retrieve and paintings with info from a number of info assets
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Extra info for Sams teach yourself ADO . NET in 24 hours
Each of these lines represents a relationship in the database. ” Notice how each relationship has an infinity symbol on one terminating end and a key on the other. The table connected via the infinity symbol may contain multiple entries from a column in the other table. For instance, the CustomerID field of the Orders table may only contain entries from the CustomerID field of the Customers table. It can contain the same CustomerID as many times as required (one per order per customer, in fact).
A Yes, in fact you will still use joins in your database queries to retrieve data. Retrieving data first into DataSets, setting up relationships, and then navigating the relationships is much slower than simply using a join operation and letting your data source assemble the records for you. However, there are many instances (such as the case with varying data sources) where the DataRelation object comes in very handy. Workshop These quiz questions are designed to test your knowledge of the material covered in this chapter.
Tan( expr ) Returns the tangent. Summary In this hour, you’ve seen the four most often used SQL queries: SELECT, INSERT, UPDATE, and DELETE. You also saw how some of these queries run against the Northwind database on Microsoft SQL Server. Lastly, you saw some built-in SQL Server methods that make working with strings, dates, and numbers much easier. Q&A Q Where can I learn more about writing SQL queries? A A great book for learning SQL syntax is Sams Teach Yourself SQL in 10 Minutes Second Edition.