how to generate barcode in c# Nesting FOR XML Queries in Visual C#.NET

Make QR in Visual C#.NET Nesting FOR XML Queries

Nesting FOR XML Queries
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All FOR XML mode queries can be nested to produce a hierarchy. This means that you can place a FOR XML query as a subquery in another FOR XML query to produce a complete XML document: Consider the following query and result:
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SELECT c.CustomerID AS "@Id" ,c.AccountNumber AS "@AccountNumber" ,c.CustomerType AS "@Type" ,( SELECT TOP(2) -- Included to limit the size of the XML result. soh.SalesOrderID AS "@Id" ,soh.OrderDate AS "@OrderDate" ,soh.ShipDate AS "@ShipDate" ,( SELECT TOP(2) -- Included to limit the size of the XML result. sod.ProductID AS "@ProductId" ,sod.OrderQty AS "@Quantity" FROM Sales.SalesOrderDetail AS sod WHERE sod.SalesOrderID = soh.SalesOrderID FOR XML PATH('OrderDetail'), TYPE ) FROM Sales.SalesOrderHeader AS soh WHERE soh.CustomerID = c.CustomerID FOR XML PATH('Order'), TYPE ) AS "Orders" FROM Sales.Customer AS c WHERE c.CustomerID = 1 FOR XML PATH('Customer');
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Here is the result:
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<Customer Id="1" AccountNumber="AW00000001" Type="S"> <Orders> <Order Id="43860" OrderDate="2001-08-01T00:00:00" ShipDate="2001-08-08T00:00:00"> <OrderDetail ProductId="761" Quantity="2" /> <OrderDetail ProductId="770" Quantity="1" /> </Order>
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Lesson 1: Working with XML
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<Order Id="44501" OrderDate="2001-11-01T00:00:00" ShipDate="2001-11-08T00:00:00"> <OrderDetail ProductId="761" Quantity="1" /> <OrderDetail ProductId="768" Quantity="3" /> </Order> </Orders> </Customer>
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Note that the TYPE option is required in each subquery. Without the TYPE option, SQL Server interprets the result of the subquery as an XML-encoded string. The following XML would be returned if the TYPE option were removed from the subqueries in the previous example:
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<Customer Id="1" AccountNumber="AW00000001" Type="S"> <Orders> <Order Id="43860" OrderDate="2001-08-01T00:00:00" ShipDate="2001-08-08T00: 00:00">&lt;OrderDetail ProductId="761" Quantity="2"/&gt;&lt;OrderD etail ProductId="770" Quantity="1"/&gt;</Order><Order Id="44501" Ord erDate="2001-11-01T00:00:00" ShipDate="2001-11-08T00:00:00">&lt;OrderDetail ProductId="761" Quantity="1"/&gt;&lt;OrderDetail ProductId="768" Quantity= "3"/&gt;</Order> </Orders> </Customer>
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Finally, it is possible to add an XML namespace to the result by including the WITH XMLNAMESPACES clause in the query. In the following example, the namespace http://www .contoso.com/CustomerSchema is added as the default namespace for the XML document, and the namespace http://www.contoso.com/CustomerSchemaV2 is added under the alias v2 (the AdditionalInfo subelement is the only element that uses the v2 alias):
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WITH XMLNAMESPACES( DEFAULT 'http://www.contoso.com/CustomerSchema' ,'http://www.contoso.com/CustomerSchemaV2' AS v2 ) SELECT c.CustomerID AS "@Id" ,c.AccountNumber AS "@AccountNumber" ,c.CustomerType AS "@Type" ,c.ModifiedDate AS "v2:AdditionalInfo/@ModifiedDate" FROM Sales.Customer AS c WHERE c.CustomerID IN (1, 2) FOR XML PATH('Customer'), ROOT('Customers');
Here is the result:
<Customers xmlns:v2="http://www.contoso.com/CustomerSchemaV2" xmlns="http://www.contoso.com/CustomerSchema"> <Customer Id="1" AccountNumber="AW00000001" Type="S"> <v2:AdditionalInfo ModifiedDate="2004-10-13T11:15:07.263" /> </Customer>
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<Customer Id="2" AccountNumber="AW00000002" Type="S"> <v2:AdditionalInfo ModifiedDate="2004-10-13T11:15:07.263" /> </Customer> </Customers>
Using the XML Data Type
SQL Server 2008 includes the XML data type, which can be used to store both XML fragments and documents. Internally, the XML data type is stored using the varbinary(max) data type; that is, the XML is not stored as a text string but rather as a binary representation of an XML document or fragment. The XML data type can be either typed or untyped. Typed simply means that an XML schema collection is assigned to the type to verify its contents. The following example shows the creation of an XML schema collection and a table with both untyped and typed XML columns. Note that the typed XML column includes the use of the DOCUMENT option to force the column to support only XML documents (and not fragments):
CREATE XML SCHEMA COLLECTION BooksSchemaCollection AS N'< xml version="1.0" > <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.contoso.com/BooksSchema" xmlns="http://www.contoso.com/BooksSchema" elementFormDefault="qualified"> <xs:element name="Book"> <xs:complexType> <xs:attribute name="Title" type="xs:string"/> <xs:attribute name="Price" type="xs:decimal"/> </xs:complexType> </xs:element> </xs:schema>'; GO
CREATE TABLE Test.Person ( PersonID INT IDENTITY PRIMARY KEY ,Name NVARCHAR(50) NOT NULL ,FavoriteBookUntypedXml XML NULL ,FavoriteBookTypedXml XML(DOCUMENT BooksSchemaCollection) NULL );
Now let s look at the following DML statements. Note that updating a typed column with invalid data (in this case, a book with an invalid price of FortyFive instead of 45) receives
Lesson 1: Working with XML
an XML validation error message, but the same invalid data is allowed in the untyped XML column:
INSERT Test.Person (Name) VALUES ('Jane Dow');
-- Will succeed: UPDATE Test.Person SET FavoriteBookUntypedXml = '<Book xmlns="http://www.contoso.com/BooksSchema" Title="The Best Book" Price="FortyFive"/>' WHERE PersonID = 1;
-- Will not succeed: UPDATE Test.Person SET FavoriteBookTypedXml = '<Book xmlns="http://www.contoso.com/BooksSchema" Title="The Best Book" Price="FortyFive"/>' WHERE PersonID = 1;
-- Will succeed: UPDATE Test.Person SET FavoriteBookTypedXml = '<Book xmlns="http://www.contoso.com/BooksSchema" Title="The BestBook" Price="45"/>' WHERE PersonID = 1;
Here are the results:
(1 row(s) affected)
(1 row(s) affected)
Msg 6926, Level 16, State 1, Line 3 XML Validation: Invalid simple type value: 'FortyFive'. Location: /*:Book[1]/@*:Price
(1 row(s) affected)
One last important note is that there is a problem with using typed XML columns, and that is the fact that the data structure might change. If you need to change the schema (such as by adding more attributes to an element), you must first alter all columns that uses the schema to instead use untyped XML. Then, you must drop the schema collection, re-create it with the added attributes, and finally alter the columns again to use the schema. The problem isn t just that it s a lot of work to create the scripts to perform this change (though that s bad enough). It also creates a lot of work for SQL Server because untyped and typed XML code have different structures internally (for example, all data in untyped XML is stored as strings, whereas in typed XML, the data is stored using the actual data type selected in the schema) and SQL Server must then convert all data from typed to untyped and then back again each time you want to change the XML schema.
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