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To export the Band data from the database
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xmlnamespaces ( 'http://www.w3.org/2001/XMLSchema-instance' as xsi ,'http://schemas.milambda.net/Music' as m ,'http://schemas.milambda.net/Music-Band' as mb ) Music.Band.Name as [@mb:bandName] ,Music.Band.Established as [@mb:established] ,Music.Band.Disbanded as [@mb:disbanded] ,( select Music.Person.FirstName as [@m:firstName] ,Music.Person.MiddleName as [@m:middleName] ,Music.Person.LastName as [@m:lastName] from Music.Person inner join Music.BandMember on Music.BandMember.PersonId = Music.Person.PersonId where (Music.BandMember.BandId = Music.Band.BandId) order by Music.Person.LastName ,Music.Person.FirstName ,Music.Person.MiddleName for xml path('mb:member'), type ) from Music.Band order by Music.Band.Name for xml path('mb:band'), root('mb:bands'), type
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The proper nesting of the data (namely, that the Band contains the correct Members) is achieved by correctly referencing the Band Member associative entity, where the many-to-many relationships between the Bands and the Persons are stored. The outer query also uses a PATH declaration specifying the XML node (mb:band) together with the ROOT declaration specifying the name of the XML root node. The TYPE declaration is used to instruct the database engine to return the resultset as XML data rather than character data, which is the default (if the TYPE declaration is omitted). Once again, we began the T-SQL query with the XML namespaces declaration, providing us with all the necessary namespaces implemented by the corresponding Band XML Schema. The first thing that should be apparent from listing 13 is the added complexity resulting from the deeper nesting of the Album XML entity. Remember how we defined the Album XML Schema: a Discography contains one or more Albums containing one or more Tracks written by one or more Authors and performed by one or more Bands.
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select
xmlnamespaces ( 'http://www.w3.org/2001/XMLSchema-instance' as xsi ,'http://schemas.milambda.net/Music' as m ,'http://schemas.milambda.net/Music-Album' as ma ) Music.Title.Title as [@ma:title] ,Music.Album.Published as [@ma:published] ,( select Music.Title.Title as [@ma:title] ,Music.Track.TrackNumber as [@ma:trackNumber] ,( select Music.Person.FirstName as [@m:firstName] ,Music.Person.MiddleName as [@m:middleName] ,Music.Person.LastName as [@m:lastName] from Music.Person inner join Music.TrackAuthor on Music.TrackAuthor.PersonId = Music.Person.PersonId where (Music.TrackAuthor.TrackId = Music.Track.TrackId) order by Music.Person.LastName ,Music.Person.FirstName ,Music.Person.MiddleName for xml path('ma:author'), type ) ,( select Music.Band.Name as [@ma:bandName] from Music.Band inner join Music.TrackPerformer on Music.TrackPerformer.BandId = Music.Band.BandId
Preparing the sample data
where (Music.TrackPerformer.TrackId =
Music.Track.TrackId)
) from
order by Music.Band.Name for xml path('ma:band'), type Music.Title inner join
Music.Track on Music.Track.TitleId = Music.Title.TitleId where (Music.Track.AlbumId = Music.Album.AlbumId) order by Music.Track.TrackNumber for xml path('ma:track'), type ) from Music.Title inner join
Music.Album on Music.Album.TitleId = Music.Title.TitleId order by Music.Album.Published for xml path('ma:album'), root('ma:discography'), type
The queries to retrieve Person and Band data are nested inside the outer query used to retrieve Track data, which is nested inside the outermost query used to retrieve Album data. The result of each inner query is exposed to the outer query as a column of the outer query s resultset, and its name is specified by the inner query s PATH declaration of the FOR XML clause. The outermost query also uses the PATH declaration specifying the destination XML node and the ROOT declaration specifying the root node of the destination XML entity. The XML namespaces declaration at the beginning of the query provides all the necessary namespaces implemented by the corresponding Album XML Schema. The queries presented in listings 11 and 12 are used in two SQL procedures, the definitions of which can be downloaded from http:/ /www.manning.com/SQLServerMVPDeepDives. Review both procedures carefully before creating them in the Discography database. Pay attention to the optional input parameters used by the procedures, and how they re used in the queries to restrict the resultset. Can you predict what would happen if the parameters weren t specified when using the procedures to retrieve data
Preparing the sample data
As the development of a client application to create and edit XML data is outside the scope of this chapter, you could resort to a generic solution such as Microsoft InfoPath, or design a custom application implementing the functionalities provided in this chapter, or even use a text editor to create XML data. InfoPath, for instance, provides a fairly simple way of designing forms based on sample XML data or on an XML Schema, such as the two schemas used in this chapter.
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