how to generate and print barcode in c# windows application CHAPTER 7 Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream in C#

Maker Denso QR Bar Code in C# CHAPTER 7 Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream

264 CHAPTER 7 Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
QR Generation In Visual C#.NET
Using Barcode printer for .NET Control to generate, create QR image in Visual Studio .NET applications.
www.OnBarcode.com
QR Code ISO/IEC18004 Decoder In C#
Using Barcode decoder for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
changing the name of the column by using an alias, you are also changing the attribute s name (this was also supported in SQL Server 2000):
Encode Barcode In C#
Using Barcode generator for .NET Control to generate, create barcode image in VS .NET applications.
www.OnBarcode.com
Barcode Recognizer In C#.NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
SELECT c.CustomerID AS Id ,c.AccountNumber FROM Sales.Customer AS c WHERE c.CustomerID IN (1,2) FOR XML RAW('Customer'), ROOT('Customers');
Generate Denso QR Bar Code In VS .NET
Using Barcode maker for ASP.NET Control to generate, create Denso QR Bar Code image in ASP.NET applications.
www.OnBarcode.com
Creating QR-Code In .NET Framework
Using Barcode drawer for .NET framework Control to generate, create QR Code image in .NET applications.
www.OnBarcode.com
Here is the result:
QR Maker In VB.NET
Using Barcode creator for VS .NET Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
www.OnBarcode.com
Bar Code Creator In C#
Using Barcode printer for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
www.OnBarcode.com
<Customers> <Customer Id="1" AccountNumber="AW00000001" /> <Customer Id="2" AccountNumber="AW00000002" /> </Customers>
PDF-417 2d Barcode Printer In C#.NET
Using Barcode creator for .NET framework Control to generate, create PDF417 image in VS .NET applications.
www.OnBarcode.com
Code-39 Drawer In Visual C#.NET
Using Barcode creator for .NET Control to generate, create Code 3/9 image in .NET framework applications.
www.OnBarcode.com
A question you might ask yourself is how NULLs are handled in XML results. The default implementation is to simply remove the attribute if the value is NULL. This is good for most applications, but some applications might differentiate between a missing value and NULL. How can they be differentiated Consider the following example: A customer s XML element describes a customer in the database that needs to be updated. The customer has 10 attributes that can possibly exist in the XML element, but only 2 of them exist in this particular XML element. When passing this XML element to the database to perform an update of the customer, the database can take one of two actions:
Making EAN13 In C#
Using Barcode creation for VS .NET Control to generate, create GS1 - 13 image in Visual Studio .NET applications.
www.OnBarcode.com
Leitcode Encoder In Visual C#.NET
Using Barcode creator for .NET Control to generate, create Leitcode image in .NET applications.
www.OnBarcode.com
Update all 10 attributes, setting 8 of them to NULL because they are missing and 2 of them to their new values. Update only the 2 attributes that exist in the XML element being passed to the database and skip the remaining 8, letting them keep their current values.
Generating Bar Code In Java
Using Barcode printer for Java Control to generate, create barcode image in Java applications.
www.OnBarcode.com
Read Bar Code In VB.NET
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in Visual Studio .NET applications.
www.OnBarcode.com
If you choose the second option, just leaving the attributes out of the XML element if they are actually NULL won t work. You must somehow define explicitly that they are actually NULL (or should be set to NULL). This is supported through an element in XML called NIL. NIL in XML is equal to what the database refers to as NULL. If a value should be defined as NIL, it cannot be stored in an attribute. Rather, it must be stored as its own element because it needs an attribute that defines it as NIL if necessary. Look at the following example, where the first element representing a product has Color set to NULL. The previously used FOR XML RAW query was used as a reference. Note that the Color attribute is missing for the first product:
Barcode Creator In Java
Using Barcode printer for BIRT Control to generate, create barcode image in BIRT applications.
www.OnBarcode.com
Code 39 Extended Creation In None
Using Barcode drawer for Office Word Control to generate, create Code 3 of 9 image in Word applications.
www.OnBarcode.com
SELECT p.ProductID AS Id ,p.ListPrice ,p.Color FROM Production.Product AS p WHERE p.ProductID IN (514, 707) FOR XML RAW('Product'), ROOT('Products');
EAN / UCC - 13 Decoder In Visual Basic .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Barcode Encoder In None
Using Barcode drawer for Font Control to generate, create barcode image in Font applications.
www.OnBarcode.com
Lesson 1: Working with XML
UPC-A Encoder In VB.NET
Using Barcode printer for VS .NET Control to generate, create UPC-A image in VS .NET applications.
www.OnBarcode.com
Make Barcode In VS .NET
Using Barcode printer for Reporting Service Control to generate, create bar code image in Reporting Service applications.
www.OnBarcode.com
The query returns this result:
<Products> <Product Id="514" ListPrice="133.3400" /> <Product Id="707" ListPrice="34.9900" Color="Red" /> </Products>
Now consider the next example, where you add the ELEMENTS directive to make each column an XML element instead of an attribute. Note that the Color element is still missing for the first product:
SELECT p.ProductID AS Id ,p.ListPrice ,p.Color FROM Production.Product AS p WHERE p.ProductID IN (514, 707) FOR XML RAW('Product'), ROOT('Products'), ELEMENTS;
Here is the result:
<Products> <Product> <Id>514</Id> <ListPrice>133.3400</ListPrice> </Product> <Product> <Id>707</Id> <ListPrice>34.9900</ListPrice> <Color>Red</Color> </Product> </Products>
Finally, you add the XSINIL directive to the ELEMENTS directive to tell SQL Server to handle NULLs by keeping the XML element for the missing value and setting its NIL attribute to True. In this case, you can see that Color is actually NULL (or NIL) and not just missing :
SELECT p.ProductID AS Id ,p.ListPrice ,p.Color FROM Production.Product AS p WHERE p.ProductID IN (514, 707) FOR XML RAW('Product'), ROOT('Products'), ELEMENTS XSINIL;
Here is the result, with the NULL color shown in bold type:
<Products xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <Product> <Id>514</Id>
Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
<ListPrice>133.3400</ListPrice> <Color xsi:nil="true" /> </Product> <Product> <Id>707</Id> <ListPrice>34.9900</ListPrice> <Color>Red</Color> </Product> </Products>
In the last example, you can also see that an XML namespace reference called xsi that references http://www.w3.org/2001/XMLSchema-instance has been added to the root element. This is because the NIL attribute is defined in this namespace. The namespace reference is always added if you use the XSINIL directive. Before moving on to the next FOR XML mode, AUTO, you should know that both the ELEMENTS and XSINIL directives exist for the AUTO mode but not for the two other modes, EXPLICIT and PATH.
Copyright © OnBarcode.com . All rights reserved.