winforms data matrix

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This is certainly a nice way of creating many records in our database with minimal effort The sample data of our database contains 9 possible attribute values and 62 products The cross-join operation that associates all attribute values to all products generates 558 (which is 9 multiplied by 62) records in the ProductAttributeValue table Note that the use of SELECT to create the cross join is not standard SQL, although its form is commonly accepted by the major database servers The official syntax to implement cross joins specifies the use of the CROSS JOIN syntax: INSERT INTO ProductAttributeValue (ProductID, AttributeValueID) SELECT pProductID, avAttributeValueID FROM product p CROSS JOIN AttributeValue av; Instead of using a cross join, we could use the UNION method described earlier UNION sums up the results of multiple SELECT statements into a single result set.

In this chapter, you learned how to apply interfaces, implementations, and components in a kernel-type situation. This is very much the type of programming that you will encounter as you continue using C#. Here, I will provide a few more details about using private classes and initializing objects with nested data types.

Figure 5-13. Results of creating a scenario PivotTable report to display several race-day cash-flow forecasts in PivotTable format

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For example, if you use UNION for two queries that return five records each, you get a result set of ten records Of course, for UNION to work, all the queries involved must return the same number of columns of compatible data types We won t go into more details about UNION, but if you re curious to see the UNION-based implementation of the cross join, here it is It necessitates more keystrokes, but the query offers you more flexibility; for example, using UNION, you could add only certain attribute values to your products.

The RoomGrouping and Room classes are defined in the LibLightingController project and are private to the library. This is because RoomGrouping and Room are classes only LightingController needs to support its functionality. The declaration of each class is internal to the assembly, which is good, but it still means that some developers could use the classes within the kernel assembly for their own purposes. Sometimes that is a desirable feature; sometimes it is not. In the case of LightingController, another approach is to declare the classes in the context of LightingController, as follows: public class LightingController { private class RoomGrouping { } private class Room { } } The Room and RoomGrouping classes are declared within the class, and their declarations are private. This means that only LightingController can instantiate and use the classes, and there can never be the situation where another class will instantiate the types. In the case of LightingController, this would have been a better solution. Private classes are also used in the factory context. For example, imagine the situation where you don t ever want anyone but the factory to instantiate a room. A possible IRoom declaration and factory could be as follows: public static class Factory { private class MyRoom : IRoom { } public static IRoom CreateMyRoom() { return new MyRoom(); } } In this implementation of MyRoom, you can be sure that only Factory can ever instantiate MyRoom, and you can always be sure that the only way to manipulate MyRoom is through the IRoom interface. All too often, developers become lazy and instantiate types within the assembly, and switch to the implementation type whenever the interface does not have the methods or properties that they want.

-- Populate ProductAttributeValue table INSERT INTO ProductAttributeValue (ProductID, AttributeValueID) SELECT ProductID, 1 AS AttributeValueID FROM product UNION ALL SELECT ProductID, 2 AS AttributeValueID FROM product UNION ALL SELECT ProductID, 3 AS AttributeValueID FROM product UNION ALL SELECT ProductID, 4 AS AttributeValueID FROM product UNION ALL SELECT ProductID, 5 AS AttributeValueID FROM product UNION ALL SELECT ProductID, 6 AS AttributeValueID FROM product UNION ALL SELECT ProductID, 7 AS AttributeValueID FROM product UNION ALL SELECT ProductID, 8 AS AttributeValueID FROM product UNION ALL SELECT ProductID, 9 AS AttributeValueID FROM product; Finally, let s take a look at the CatalogGetProductAttributeValues stored procedure This stored procedure receives as a parameter the ID of a product and returns a list of that product s attributes.

This is the handy little device that the business tier will call to get the list of attributes for our products so our customers can choose a color for each balloon: -- Create CatalogGetProductAttributeValues stored procedure CREATE PROCEDURE CatalogGetProductAttributeValues (@ProductId INT) AS The SQL code in this procedure returns a list with the AttributeName, AttributeValueID, and AttributeValue for all the attributes of the mentioned product: SELECT aName AS AttributeName, avAttributeValueID, avValue AS AttributeValue FROM AttributeValue av.

In this chapter, you saw how to use object initialization to assign data members in lieu of a constructor. Object initialization also works using nested data types. Consider the situation where a type references another type. Using object initialization, you can instantiate and assign multiple levels of objects.

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