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This code is complicated slightly by the fact that a list of moons is associated with each planet In other words, we have a list of lists By this point in the book, however, that arrangement should be as comfortable as a warm bath in the evening Hopefully you will have little trouble following how loops use calls to to move our data into the nested the database
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It should be clear that you can learn the details of how to create a particular kind of table, or other database entity, by rst creating one in your database and then using the Object Relational Designer to create a class based on it You can then study the class you created and mimic its syntax in your own classes Alternatively, you can use code like what I ve shown here to create an approximation of the data structure you want in your tables Then use the SQL tools to re ne your data model, and use the Object Relational Designer to convert your tables back into C# classes These may not be the most elegant of solutions, but they have a certain practical ef cacy
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Viewing the Data Schemas When creating a database programmatically, it is sometimes convenient to nd a way to check if the tables conform to our plans SQL server provides tables We the information we need in the form of the need only nd an easy way to access this information One simple approach would be to create a view in the database As shown in Figure 152, you can do this by opening Database (or Server) Explorer, expanding the nodes for your database, right-clicking the nodes, and selecting Add New View
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15: XML Name space s, Transformations, and Schema
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Dismiss the Add Table dialog that pops up, and insert an SQL statement like this in the query designer:
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Click the red Execute Query button, or press Ctrl-R to con rm that you have written the correct SQL If you are satis ed, save the view by choosing File, Save All Drag the newly created view from the Explorer onto the Object Relational Designer Now you can access these classes using LINQ to SQL just as you would any other database entity Alternatively, you can simply create your own declarations for these classes and place them in a le or assembly that you can include in any project you create Because the tables have the same de nition in all databases, you need to declare them only once and then reuse them as often as you want Declarations for these tables are shown in Listing 158, and examples of how to use them are provided in the CreateDatabase sample program that accompanies this book
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Listing 158 A Complete Declaration for Declaration for and a Partial
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LINQ to XML makes it easy for you to validate an XML document by testing it against a schema I ll walk you through the process, taking a few moments to explain the basics of XSD and schema validation When used properly, XML can be easy to read and easy to understand This clarity derives in part from the sparseness of the XML speci cation Although people manage to create hard-to-read XML documents, the syntax nevertheless can be simple if developers want it to be The sparseness of XML comes at a price Unlike C#, XML has no builtin type checking The absence of this feature helps keep XML simple and easy to understand but leaves it exposed to misinterpretation You can have two different problems with an XML document: It might have a syntactic aw, in which case we say that it is not well formed It might have a semantic problem, in which case we might consider it invalid
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