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11.3.1 Goal
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Our goal is to export XML of the books within our book catalog database (see figure 11.2). This will allow us to share our catalog with other LinqBooks users. We re going to start by creating the desired XML with the Paste XML as LINQ Visual Studio Add-In that is shipped as a sample with Visual Studio 2008, and then define our queries to retrieve the data from the database. Once we have the stub code for our XML and the queries for retrieving the data, we ll combine the two to create our desired XML. Listing 11.8 shows the XML that we ll create.
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Listing 11.8 The XML that will be created from our database
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<books> <book> <title>LINQ in Action</title> <authors> <author> <firstName>Steve</firstName> <lastName>Eichert</lastName> <webSite>http://iqueryable.com</webSite> </author> <author> <firstName>Fabrice</firstName> <lastName>Marguerie</lastName> <webSite>http://linqinaction.net/</website> </author> <author> <firstName>Jim</firstName> <lastName>Wooley</lastName> <webSite>http://devauthority.com/blogs/jwooley</website> </author> </authors> <subject> <name>LINQ</name> <description>LINQ shall rule the world</description> </subject> <publisher>Manning</publisher> <publicationDate>January, 2008</publicationDate> <price>43.99</price> <isbn>1933988169</isbn> <notes>Great book!</notes> <summary>LINQ in Action is great!</summary> <reviews> <review>
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Common LINQ to XML scenarios
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<user>Steve Eichert</user> <rating>5</rating> <comments>What can I say, I m biased!</comments> <review> <reviews> </book> </books>
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To create this XML we ll need to query data from the database tables shown in figure 11.3. Now that we ve seen the structure of the XML we re trying to produce as well as the schema for the database tables we ll be pulling our data from, let s look at the technique we ll use to accomplish our goal.
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Figure 11.3 Database schema
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Creating XML with data from a database
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11.3.2 Implementation
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Functional construction provides a powerful means by which we can create XML. By embedding query expressions within functional construction statements, XML trees can be built from a database or any other data source. Since LINQ to SQL provides an implementation of the standard query operators for querying relational databases, we can use familiar LINQ query expressions to retrieve the data for creating the desired XML. The XML tree that we re going to produce requires information from every table within the database schema shown in figure 11.3. To retrieve the data, we ll generate a set of objects from our database using LINQ to SQL. As we discussed in chapter 6, LINQ to SQL creates a class for every table in the database. In addition to generating properties that map to each column in the database, LINQ to SQL also generates properties to represent the relationships within the database. This allows all the relevant information required for creating our XML to be retrieved via the Book class. Before diving into the code necessary for creating the XML from the database, we need to generate our LINQ to SQL objects. There are several options available for generating our objects. To keep things simple, we ll use the SqlMetal.exe command-line executable that ships with LINQ to SQL.
CMD>Sqlmetal /server:localhost /database:LinqInAction /pluralize /namespace:LinqInAction.LinqToSql /code:LinqInAction.cs
While the details of SqlMetal are outside the scope of this chapter, you can find more information about how to leverage it to create LINQ to SQL objects by checking out chapter 7 or by browsing to \Program Files\Microsoft SDKs\Windows\v6.0A\Bin and executing SqlMetal.exe without any command-line switches.
usage: sqlmetal [options] [<input file>] options: /server:<name> database server name /database:<name> database catalog on server /user:<name> login user id /password:<name> login password /views extract database views /functions extract database functions /sprocs extract stored procedures /xml[:file] output as xml /code[:file] output as source code /map[:file] generate xml mapping file instead of attributes /language:xxx language for source code (vb,csharp) /namespace:<name> namespace used for source code /pluralize auto-pluralize table names /dataAttributes auto-generate DataObjectField and Precision attributes /timeout:<seconds> timeout value in seconds to use for database commands
Common LINQ to XML scenarios
Once we have our LINQ to SQL objects generated, we can write the code for creating our XML tree. To get started, we can copy the XML in our sample XML document to the clipboard and use the Paste XML as LINQ Visual Studio add-in to give us the C# code shown in listing 11.9.
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