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The Title entity contains both the Album and the Track titles. Because in SQL Server 2005 it s not possible to specify a union XPath expression, the two sets must be merged into one using the T-SQL UNION clause. Using the union XPath expression, the query could be simplified as shown in listing 5.
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Listing 5
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Simplified query with union XPath expression
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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-Album' as ma ) Discography.Album.query ('
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Enabling and maintaining the data flow
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data(@ma:title) ').value ( '.' ,'nvarchar(450)' ) as Title @xml.nodes (' /ma:discography/ma:album | /ma:discography/ma:album/ma:track ') Discography (Album)
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Next up, listing 6 shows the code to extract the albums.
Listing 6
with
Extracting the albums
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 ) Discography.Album.query (' data(@ma:title) ').value ( '.' ,'nvarchar(450)' ) as Title ,Discography.Album.query (' data(@ma:published) ').value ( '.' ,'datetime' ) as Published from @xml.nodes (' /ma:discography/ma:album ') Discography (Album)
Listing 7 shows the code to extract the tracks.
Listing 7
with
Extracting the tracks
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 ) Discography.Track.query
Using XML to transport relational data
(' data(@ma:title) ').value ( '.' ,'nvarchar(450)' ) as TrackTitle ,Discography.Track.query (' data(@ma:trackNumber) ').value ( '.' ,'int' ) as TrackNumber ,Discography.Track.query (' data(parent::ma:album/@ma:title) ').value ( '.' ,'nvarchar(450)' ) as AlbumTitle ,Discography.Track.query (' data(parent::ma:album/@ma:published) ').value ( '.' ,'datetime' ) as Published from @xml.nodes (' /ma:discography/ma:album/ma:track ') Discography (Track)
Listing 8 shows the code to extract the persons.
Listing 8
with
Extracting the persons
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 ) distinct Discography.Person.query (' data(@m:firstName) ').value ( '.' ,'nvarchar(150)' ) as FirstName
Enabling and maintaining the data flow
,Discography.Person.query (' data(@m:middleName) ').value ( '.' ,'nvarchar(150)' ) as MiddleName ,Discography.Person.query (' data(@m:lastName) ').value ( '.' ,'nvarchar(150)' ) as LastName from @xml.nodes (' /ma:discography/ma:album/ma:track/ma:author ') Discography (Person)
Listing 9 shows the code to extract the bands.
Listing 9
with
Extracting the bands
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 ) distinct Discography.Band.query (' data(@ma:bandName) ').value ( '.' ,'nvarchar(450)' ) as [Name] from @xml.nodes (' /ma:discography/ma:album/ma:track/ma:band ') Discography (Band)
EXTRACTING BAND DATA
The source of the Band data is an XML entity based on the Band XML Schema shown in listing 2 earlier in this chapter. This XML Schema provides all the data for the Band and Person entities, including the data for the Band Member associative entity. Compare the XML namespace declarations in listing 10 with the declaration in the code listings presented earlier. Is there something different Why
Using XML to transport relational data
Listing 10
with
Extracting the bands
select
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 ) distinct Bands.Band.query (' data(@mb:bandName) ').value ( '.' ,'nvarchar(450)' ) as [Name] ,nullif(Bands.Band.query (' data(@mb:established) ').value ( '.' ,'datetime' ), N'') as Established ,nullif(Bands.Band.query (' data(@mb:disbanded) ').value ( '.' ,'datetime' ), cast(N'99991231' as datetime)) as Disbanded from @xml.nodes (' /mb:bands/mb:band ') Bands (Band)
Listing 11 shows the code to extract the persons.
Listing 11
with
Extracting the persons
select
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 ) distinct Bands.Band.query (' data(@mb:bandName) ').value ( '.'
Enabling and maintaining the data flow
,'nvarchar(450)' ) as [Name] ,nullif(Bands.Band.query (' data(@mb:established) ').value ( '.' ,'datetime' ), N'') as Established ,nullif(Bands.Band.query (' data(@mb:disbanded) ').value ( '.' ,'datetime' ), N'') as Disbanded from @xml.nodes (' /mb:bands/mb:band ') Bands (Band)
By combining the queries listed previously into a workflow of data management operations, we can design two SQL procedures, each with a specific purpose based on the two principal business entities mentioned in the section The XML Schema : one procedure to save the Album data and one procedure to save the Band data.
Here s a beginner s trick for memorizing XML retrieval methods: Nodes provide the set, query retrieves the data element, and value extracts the data.
We haven t discussed one important issue yet the question of associative entities. As you may have observed in our examples, only the primary entities are listed. Why is that The answer is simple: associative entities, representing the many-to-many relationships between the primary entities, can be retrieved from the XML source by combining the queries used in retrieving the data of the individual primary entities of a particular relationship. The combinations are listed in table 5.
Table 5 Retrieving the associative entities Provided by combining these primary entities Track joined with Person based on the nesting of the Author XML element inside the Track XML element of the Album XML Track joined with Band based on the nesting of the Band XML element inside the Track XML element of the Album XML Band joined with Person based on the nesting of the Person XML element inside the Band XML element of the Band XML
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