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.net upc-a reader

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The RAW mode of the FOR XML clause returns the XML data as zero or more XML elements. By default the name of the elements is <row>. You can change this default behavior by specifying an element name yourself. The column values are returned as XML attributes. Listing 10-3 shows the use of RAW mode. Listing 10-3. Using the RAW Mode of the FOR XML Clause SELECT EmployeeID,FirstName,LastName FROM Employees FOR XML RAW <row <row <row <row .... EmployeeID="1" EmployeeID="2" EmployeeID="3" EmployeeID="4" FirstName="Nancy" LastName="Davolio"/> FirstName="Andrew" LastName="Fuller"/> FirstName="Janet" LastName="Leverling"/> FirstName="Margaret" LastName="Peacock"/>





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Universal Product Code - Wikipedia
The Universal Product Code ( UPC ) (redundantly: UPC code) is a barcode symbology that is .... read UPC -like labels with his ring wand. In addition to reading regular labels, he read the large two-page centerfold label in the proposal booklet.

The FROM keyword is optional and can be omitted. We generally use it because it makes the query sound more like normal English. Most times, you ll want to use the WHERE clause to delete a single row: DELETE FROM Department WHERE DepartmentID = 43 As with UPDATE, be careful with this command, because if you forget to specify a WHERE clause, you ll end up deleting all the rows in the specified table. The following query deletes all the records in Department. The table itself isn t deleted by the DELETE command. DELETE FROM Department

As you can see, the FOR XML clause is followed by the RAW mode. The returned XML contains <row> elements with attributes holding the column values. If you wish to change the default element name, you can specify your own element name as shown in Listing 10-4. Listing 10-4. Assigning a Custom Element Name to the Output of RAW Mode SELECT EmployeeID,FirstName,LastName FROM Employees FOR XML RAW ('Employee') <Employee <Employee <Employee <Employee .... EmployeeID="1" EmployeeID="2" EmployeeID="3" EmployeeID="4" FirstName="Nancy" LastName="Davolio"/> FirstName="Andrew" LastName="Fuller"/> FirstName="Janet" LastName="Leverling"/> FirstName="Margaret" LastName="Peacock"/>

Tip As with INSERT [INTO], the FROM keyword is optional. Add it if you feel it makes the statement

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You need to create the GetDepartments stored procedure, which returns department information from the Department table. This stored procedure is part of the data tier and will be accessed from the business tier. The final goal is to have this data displayed in the user control. The SQL code that retrieves the necessary data and that you need to save to the database as the GetDepartments stored procedure is the following: SELECT DepartmentID, Name, Description FROM Department This command returns all the department information.

As you can see, we ve now specified Employee as the element name in parentheses. This element name is given to all the returned rows.

Caution Unless you have a specific reason to do so, never ask for all columns (using the * wildcard) when you only need a part of them. This generates more traffic and stress on the database server than necessary and slows down performance. Moreover, even if you do need to ask for all columns in the table, it s safer to mention them explicitly to protect your application in case the number or order of columns change in future.

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As with data tables, after you know the structure, implementing the stored procedure is a piece of cake. Now that you know the SQL code, the tools will help you save the query as a stored procedure easily.

The XMLSCHEMA clause of the FOR XML clause allows you to return the XSD schema of the XML data being returned. You may use this schema to validate your data further in your application. Listing 10-5 shows how the XMLSCHEMA clause is used.













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