distinguishing barcode scanners from the keyboard in winforms

distinguishing barcode scanners from the keyboard in winforms

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To return to the original sequence, in the notification area, tap the Change tablet and pen settings icon, and then tap Properties. In the Screen Orientation area in the Tablet and Pen Settings dialog box, click the Change button to the right of Sequence. In the Orientation Sequence Settings dialog box, click the 2 arrow, and then click Primary Portrait. Click the 3 down arrow, click Secondary Landscape, and then tap OK. To close the Tablet and Pen Settings dialog box and apply the default settings, tap OK.

Issue the following UPDATE statement, which doubles the total quantity of all orders:

UPDATE dbo.OrderTotals SET totalqty = totalqty * 2;

A web publishing framework is a software suite design to speed the development of an XML-based presentation layer.

Query the table and view again after the change:

SELECT oid, pid, qty FROM dbo.OrderDetails; SELECT oid, totalqty FROM dbo.OrderTotals;

This generates the following output:

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Web publishing frameworks combine Java and XML technologies into a cohesive and usable architecture. They are an out-of-the-box solution for generating your user interface. Using a web publishing framework, you can create a production-ready, XML-based presentation layer without having to write custom code that integrates XML into your architecture. These frameworks were built to solve the same challenge that we outlined earlier in this chapter producing various views of the same content while maintaining a separation between presentation logic and style. Web publishing frameworks that are based on XML technologies are still relatively new. Their reliability depends on the stability of underlying components, including the XML parser and XSLT processor. A few popular web publishing framework products include the following:

oid ----------10248 10248 10248 10249 10249 10249 10250 10250 10250 oid ----------10248 10249 10250 pid ----------1 2 3 1 2 3 1 2 3 totalqty ----------120 60 120 qty ----------20 40 60 10 20 30 40 40 40

When you re done, run the following code for cleanup:

IF OBJECT_ID('dbo.OrderTotals', 'V') IS NOT NULL DROP VIEW dbo.OrderTotals; IF OBJECT_ID('dbo.OrderDetails', 'U') IS NOT NULL DROP TABLE dbo.OrderDetails;

Suppose that you maintain your own custom sequence instead of relying on the IDENTITY column property to generate numbers that will be used as keys in a table called T1 . You achieve this by holding a value in a table called Sequence; the value represents the last assigned sequence value . Whenever you need a new sequence value, you increment the value in the Sequence table and use it as the new key in T1 . Run the following code to create the table T1:

Webmacro (http:/ /www.webmacro.org) Enhydra (http:/ /www.enhydra.org) Cocoon (http:/ /xml.apache.org/cocoon)

SET NOCOUNT ON; USE tempdb; IF OBJECT_ID('dbo.T1', 'U') IS NOT NULL DROP TABLE dbo.T1; CREATE TABLE dbo.T1 ( keycol INT NOT NULL PRIMARY KEY, datacol VARCHAR(10) NOT NULL );

Then run the following code to create and initialize the Sequence table:

Networking is the practice of linking computing devices together with hardware and software that supports data communications across the computing devices. Networks can be categorized in different ways. One of the most common ways to define the different types of networks is according to the geographic area it spans. Local area networks (LANs), for example, typically reach across a single location (such as an office or home), whereas wide area networks (WANs) reach across cities or states or even across the world. The Internet is the world s largest public WAN. Any computer that you want to network with other computers or add to an existing network must have a network interface card (NIC), also called a network adaptor. You can connect to a network either by physically plugging a cable into the NIC, or over a wireless connection. Most mobile PCs today enable either one or both types of connections.

IF OBJECT_ID('dbo.Sequence', 'U') IS NOT NULL DROP TABLE dbo.Sequence; GO CREATE TABLE dbo.Sequence(val INT NOT NULL); INSERT INTO dbo.Sequence VALUES(0);

For purposes of comparison with the XSLT approach from the previous section, we now explore how our watch list example could be developed within the Cocoon web publishing framework.

When you need a new sequence value, you can issue the following code:

DECLARE @key AS INT; UPDATE dbo.Sequence SET @key = val = val + 1;

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