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Only if you use another object, such as the DataSet, can you maintain an in-memory record of the results from the query If you like, the DataSet is the equivalent of an answering machine or phone-tapping mechanism The upshot of a DataReader being only a conduit in memory, rather than a permanent place of storage, is that when you access the data in a DataReader, the data is read-only It also means you can access the results only one row at a time, and once you finish with a row and move on to the next one, you can t go back to it You can go only forward Of course, this means there are pros and cons to using only DataReader in your page.

Public Class CustomerAccount Private _accountNumber As Integer Private _balance As Decimal Public Property Balance() As Decimal Get Return _balance End Get Set(ByVal value As Decimal) _balance = value End Set End Property

Tip TotalRank, in this example, is a calculated column. It doesn t exist in the database, but it s generated

Public Sub New(ByVal accountNumber As Integer) ' (Code to read account record from database goes here.) End Sub Public Sub Update() ' (Code to update database record goes here.) End Sub End Class

On the plus side, you have the following: Using a DataReader is quick and efficient, as it doesn t need to worry about keeping track of every bit of data A DataReader doesn t need to store data in memory, so it uses fewer resources in creating a page The disadvantages are as follows:.

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If you have two CustomerAccount objects that expose a Balance property, you need to perform two separate steps to transfer money from one account to another. Conceptually, the process works like this:

This query gives three ranking points for each time one of the search string words is found in the product s name, and one ranking point for each time the words are found in the description. The query uses the WordCount function, which returns a number specifying how many times a word appears in a phrase. If none of the search words is found in a product s name or description, its ranking is 0. If any of the words are found, the ranking is a positive number. The search results will consist of the products that have a positive ranking number. In case the business tier sends fewer than five words to the procedure, the remaining @Word parameters are NULL, for which WordCount returns 0. This is okay for any-words searches, because you don t want any ranking points added for nonmatching words, and you also don t want a product eliminated because of a nonmatching word. Things are a bit more complicated for all-words searches. With all-words searches, when a single word isn t found in the product s name or description, the product must not be included in the search results. One solution to implement the all-words search is to multiply the individual rankings of each word (using 1 for NULL @Word parameters), instead of adding them; this way, if a word has a ranking of 0, the total rank will be 0, and the product is excluded from the list. The query that returns the names and rankings for each product in the Product table for an all-words search looks like the following: SELECT Product.Name, (3 * WordCount(@Word1, Name) + WordCount(@Word1, Description)) * CASE WHEN @Word2 IS NULL THEN 1 ELSE 3 * WordCount(@Word2, Name) + WordCount(@Word2, Description) END * ...

' Create an account object for each account, ' using the account number. Dim accountOne As New CustomerAccount(122415) Dim accountTwo As New CustomerAccount(123447) Dim amount As Decimal = 1000 ' Withdraw money from one account. accountOne.Balance -= amount ' Deposit money in the other account. accountTwo.Balance += amount ' Update the underlying database records using the Update() method. accountOne.Update() accountTwo.Update()

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