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exec sp_executesql N'insert [10].[Book]([Title], [ISBN]) values (@0, @1) select [BookId] from [10].[Book] where @@ROWCOUNT > 0 and [BookId] = scope_identity()',N'@0 varchar(50), @1 varchar(50)',@0='Sense and Sensibility',@1='1440469563'
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exec sp_executesql N'insert [10].[Book]([Title], [ISBN]) values (@0, @1) select [BookId] from [10].[Book] where @@ROWCOUNT > 0 and [BookId] = scope_identity()',N'@0 varchar(50), @1 varchar(50)',@0='The Time Traveler''s Wife',@1='015602943X'
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exec [10].[InsertAuthorBook] @AuthorId=1,@BookId=1
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exec [10].[InsertAuthorBook] @AuthorId=1,@BookId=2
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exec [10].[InsertAuthorBook] @AuthorId=2,@BookId=3
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exec [10].[DeleteAuthorBook] @AuthorId=1,@BookId=1
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exec sp_executesql N'delete [10].[Book] where ([BookId] = @0)',N'@0 int',@0=7
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To map the stored procedures to the Insert and Delete actions for the many-to-many association, we created the stored procedures in our database then updated the model with the stored procedures. Because Entity Framework s designer does not currently support mapping stored procedures to the Insert and Delete actions for associations, we need to edit the .edmx file directly. In the Mappings section, we added a <ModificationFunctionMapping> tag that maps the Insert and Delete actions for the association to our stored procedures. In this, we refer to the InsertAuthorBook and DeleteAuthorBook stored procedures which are defined in the Store model because we updated the model with these stored procedures from the database. In the trace from Listing 10-23, we can see not only the expected inserts for the Author and Book table, but we can also see that our stored procedures are used for to insert and delete the association.
10-10. Mapping the Insert, Update, and Delete Actions to Stored Procedures for Table per Hierarchy Inheritance
Problems
You have a model that uses Table per Hierarchy inheritance and you want to map the Insert, Update, and Delete actions to stored procedures.
Solution
Let s say you database contains a Product table that describes a couple of different kinds of products (see Figure 10-15). You have created a model with derived types for each of the product types represented in the Product table. The model looks like the one in Figure 10-16.
Figure 10-15. A Product table with a discriminator column, ProductType, that indicates the type of product described by the row in the table
STORED PROCEDURES
Figure 10-16. A model using Table per Hierarchy inheritance with a derived type for each of the products To map stored procedures to the Insert, Update, and Delete actions for this model, do the following: 1. In your database, create the stored procedures in Listing 10-24. These stored procedures will handle the Insert, Update, and Delete actions for the Book and DVD entities. Right-click the design surface and select Update Model from Database. Select the newly created stored procedures and click Finish to add them to the model. Right-click the Book entity and select Stored Procedure Mapping. Map the InsertBook, UpdateBook, and DeleteBook stored procedures to the corresponding actions for the entity. Map the Result Column Binding for the Insert action to the ProductId property. See Figure 10-17. Right-click the DVD entity and select Stored Procedure Mapping. Map the InsertDVD, UpdateDVD, and DeleteDVD stored procedures to the corresponding actions for the entity. Map the Result Column Binding for the Insert action to the ProductId property. See Figure 10-18.
Listing 10-24. The stored procedure we map to the Insert, Update, and Delete actions for the model create procedure [chapter10].[InsertBook] (@Title varchar(50), @Publisher varchar(50)) as begin insert into 10.Product (Title, Publisher, ProductType) values (@Title,@Publisher, 'Book') select SCOPE_IDENTITY() as ProductId end go
STORED PROCEDURES
create procedure [chapter10].[UpdateBook] (@Title varchar(50), @Publisher varchar(50), @ProductId int) as begin update 10.Product set Title = @Title, Publisher = @Publisher where ProductId = @ProductId end go create procedure [chapter10].[DeleteBook] (@ProductId int) as begin delete from 10.Product where ProductId = @ProductId end go create procedure [chapter10].[InsertDVD] (@Title varchar(50), @Rating varchar(50)) as begin insert into 10.Product (Title, Rating, ProductType) values (@Title, @Rating, 'DVD') select SCOPE_IDENTITY() as ProductId end go create procedure [chapter10].[DeleteDVD] (@ProductId int) as begin delete from 10.Product where ProductId = @ProductId end go create procedure [chapter10].[UpdateDVD] (@Title varchar(50), @Rating varchar(50), @ProductId int) as begin update 10.Product set Title = @Title, Rating = @Rating where ProductId = @ProductId end
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