15: XML Name space s, Transformations, and Schema in Visual C#

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15: XML Name space s, Transformations, and Schema
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Each class has an eld, a eld, and an The and are taken directly from the XML le The eld is added to form the basis of a primary key in the database Also included is associated with a particular , as well as a a list of This latter eld forms the basis of a one-to-many relationship between a and a Listing 157 shows the simplest possible take on how to decorate these classes with the mapping attributes needed to create tables in a database As explained in s 7 through 10, the two key pieces of syntax here attribute, used to map the class to a table in the database, and are the attribute, used to map a eld in a class to a column in a database the
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Listing 157 Classes That Can Be Used to Create the Tables in a Database
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When looking at this code, you might be particularly interested in the attribute It is used to create a foreign key linking the and tables on the eld The third class in this series is perhaps the most important Derived class, it contains two collections called and from the The class, you may recall, is part of LINQ to SQL, and it is designed to hold a collection of classes mapped to tables in a database
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15: XML Name space s, Transformations, and Schema
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The next step is to actually create the database and insert some data into it You can do that with this code:
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After declaring the connection string, the next step is to initialize an After instantiating the class, you can use it to instance of the create the database:
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This simple call Creates the database in the C:\Data directory Creates the and tables Adds the columns with the names and types we speci ed in our class declaration Sets up our primary and foreign keys and classes are converted into tables The attribIn short, our utes and types we use in our classes are the basis of the types and relationships created in the database The next step is to initialize a row of data and insert it into the database You can do that with this code:
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After an instance of our class is instantiated, an object initializer assigns data to its two properties Now we have a fully initialized object with data we would like to insert into the database To actually insert the and : data, call
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While still focused on the basics, take a moment to consider this code, which demonstrates how to delete a database:
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This method rst creates an instance of the and then uses it to test if the database exists If it does, the method deletes it There is no built-in command for dropping a table, but you can use the s method to construct one This command allows us to execute a T-SQL query directly In this case, we pass in the sim The result is that the table ple T-SQL command drop table is deleted from the database:
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Transferring Data from an XML File to a Database Now you know how to create a simple database using LINQ to SQL The nal step is to transfer all the data in the planet s XML le into the C#
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15: XML Name space s, Transformations, and Schema
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classes called and , and then insert the data stored in those classes into the database Here is code that performs that very task:
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This query iterates over the planets in the XML le and returns the data it clause initializes the elds of the class nds in them The rst with the data retrieved from the XML le:
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The code then instantiates instances of the class and uses the second statement and explicit conversion operators to initialize its elds:
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The nal step is to use the LINQ operator called to insert each object into the collection of the class The newly created effect of the entire query is to query the data from the XML le and insert and classes it into instances of the We can now take the computation returned from this query and use it to insert our data into the database:
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