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Resetting data to original values. Executing SQL statement against database with ADO.NET ... Database updated. As you can see, even though we queried for customers in WA, LONEP is included in the results despite that its region is OR. Sure, it s true that in the database LONEP has a region of WA, but it does not in the object we have a reference to in our code. Is anyone else getting a queasy feeling Another aspect of this behavior is that inserted entities cannot be queried back out, but deleted entities can be, prior to calling the SubmitChanges method. Again, this is because even though we have inserted an entity, when the query executes, the results set is determined by what is in the actual database, not the DataContext object s cache. Since the changes have not been submitted, the inserted entity is not yet in the database. The opposite applies to deleted entities. Listing 16-4 contains an example demonstrating this behavior.

The DOM is an API for accessing markup-based documents. This API projects a web page s hierarchical, node-based structure onto JavaScript objects using prototypes and prototype chaining. The W3C DOM Level 1, 2, and 3 specifications together represent the standard model for representing documents in JavaScript. Interfaces, such as a Document, Element, and Attribute, represent actual constructs found on a page; the Document object, for example, represents a web page s document container; an Element object represents any HTML element in that document; and so on. These objects derive from the Node object s prototype the Node object being the W3C DOM specification s atomic representation of a markup entity. Figure 6 2 demonstrates a small cutaway of the W3C DOM for context.

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Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); Console.WriteLine("First we will add customer LAWN."); db.Customers.InsertOnSubmit( new Customer { CustomerID = "LAWN", CompanyName = "Lawn Wranglers", ContactName = "Mr. Abe Henry", ContactTitle = "Owner", Address = "1017 Maple Leaf Way", City = "Ft. Worth", Region = "TX", PostalCode = "76104", Country = "USA", Phone = "(800) MOW-LAWN", Fax = "(800) MOW-LAWO" }); Console.WriteLine("Next we will query for customer LAWN."); Customer cust = (from c in db.Customers where c.CustomerID == "LAWN" select c).SingleOrDefault<Customer>(); Console.WriteLine("Customer LAWN {0}.{1}", cust == null "does not exist" : "exists", System.Environment.NewLine); Console.WriteLine("Now we will delete customer LONEP");

For drivers that support JDBC 2x, it s possible to provide information that can improve the performance of a ResultSet As mentioned earlier, a row is normally retrieved from the database only after it becomes the ResultSet s current row, but JDBC 2x allows buffering or prefetching of rows by a ResultSet The fetch size specifies the number of rows that the ResultSet should retrieve from the database each time it needs to read new rows, and that value is set using the setFetchSize() method In other words, when the driver is capable of buffering database records, this value identifies the maximum number of records that should be buffered For example, suppose you execute the following code: ResultSet rset = stmtexecuteQuery("SELECT * FROM MYTABLE"); rset.

cust = (from c in db.Customers where c.CustomerID == "LONEP" select c).SingleOrDefault<Customer>(); db.Customers.DeleteOnSubmit(cust); Console.WriteLine("Next we will query for customer LONEP."); cust = (from c in db.Customers where c.CustomerID == "LONEP" select c).SingleOrDefault<Customer>(); Console.WriteLine("Customer LONEP {0}.{1}", cust == null "does not exist" : "exists", System.Environment.NewLine); // No need to reset database since SubmitChanges() was not called.

setFetchSize(10); If you execute the ResultSet s next() method, it should retrieve ten records from the database and store them in a buffer As your application executes the next() method again to process more records, the ResultSet won t request more data from the database until all ten of the original records have been processed Once that occurs, the ResultSet will retrieve up to ten more records, and the process will be repeated Just as performing updates in a batch improved performance by reducing network calls, this type of record buffering can improve performance for the same reason You can also suggest a fetch direction to the driver, and doing so may improve its performance by identifying the direction in which you plan to process the records in a ResultSet.

Figure 6 2. Partial heirarchy of the W3C DOM IE exposes markup objects to JavaScript via a DOM; however, the DOM in IE 8 and below loosely resembles the W3C recommendation. Figure 6 3 shows the base structure and an example object chain.

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