barcodelib c# STORED PROCEDURES in Font

Create QR in Font STORED PROCEDURES

STORED PROCEDURES
Denso QR Bar Code Creator In None
Using Barcode generator for Font Control to generate, create Quick Response Code image in Font applications.
www.OnBarcode.com
PDF 417 Encoder In None
Using Barcode printer for Font Control to generate, create PDF-417 2d barcode image in Font applications.
www.OnBarcode.com
Degree = "Math" }); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { Console.WriteLine("Instructors and Students"); var allPeople = context.GetAllPeople(); foreach (var person in allPeople) { if (person is Instructor) Console.WriteLine("Instructor {0} makes {1}/year", person.Name, ((Instructor)person).Salary.ToString("C")); else if (person is Student) Console.WriteLine("Student {0}'s major is {1}", person.Name, ((Student)person).Degree); } } The following is the output of the code in Listing 10-18: Instructors and Students Instructor Karen Stanford makes $62,500.00/year Instructor Robert Morris makes $61,800.00/year Student Jill Mathers's major is Computer Science Student Steven Kennedy's major is Math
Creating Barcode In None
Using Barcode generator for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Paint EAN13 In None
Using Barcode printer for Font Control to generate, create EAN-13 Supplement 5 image in Font applications.
www.OnBarcode.com
How It Works
Barcode Maker In None
Using Barcode creation for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Printing GS1 128 In None
Using Barcode generator for Font Control to generate, create UCC - 12 image in Font applications.
www.OnBarcode.com
Using a stored procedure to populate entities in a Table per Hierarchy inheritance model turns out to be a little easier than for Table per Type (see Recipe 6). Here the stored procedure just selected all rows in the Person table. The PersonType column contains the discriminator value that we use in <FunctionImportMapping> in Listing 10-17 to conditionally map the rows to either the Student or the Instructor entities. In Recipe 6, the stored procedure had to create the column. In both recipes, the key part is the conditional mapping in the <FunctionImportMapping> tag.
Data Matrix Generator In None
Using Barcode encoder for Font Control to generate, create DataMatrix image in Font applications.
www.OnBarcode.com
Print International Standard Serial Number In None
Using Barcode encoder for Font Control to generate, create International Standard Serial Number image in Font applications.
www.OnBarcode.com
STORED PROCEDURES
Quick Response Code Recognizer In C#.NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Drawing QR Code In Objective-C
Using Barcode generation for iPhone Control to generate, create QR Code image in iPhone applications.
www.OnBarcode.com
10-8. Mapping the Insert, Update, and Delete Actions to Stored Procedures
UPC Code Decoder In Visual Basic .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Draw Barcode In Java
Using Barcode creator for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
Problem
Make UCC - 12 In VS .NET
Using Barcode maker for Visual Studio .NET Control to generate, create EAN / UCC - 14 image in Visual Studio .NET applications.
www.OnBarcode.com
Create ECC200 In None
Using Barcode creation for Software Control to generate, create ECC200 image in Software applications.
www.OnBarcode.com
You want to map the Insert, Update, and Delete actions to stored procedures.
Encode UPC-A Supplement 2 In Java
Using Barcode generator for Java Control to generate, create UPC Code image in Java applications.
www.OnBarcode.com
Making PDF 417 In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create PDF-417 2d barcode image in .NET applications.
www.OnBarcode.com
Solution
Create UPC-A Supplement 2 In Java
Using Barcode generator for Java Control to generate, create UPC-A Supplement 2 image in Java applications.
www.OnBarcode.com
Creating QR Code In None
Using Barcode encoder for Office Excel Control to generate, create Denso QR Bar Code image in Microsoft Excel applications.
www.OnBarcode.com
Let s say you have a model with the Athlete entity in Figure 10-10. The underlying database has the Athlete table in Figure 10-11. You want to use stored procedures for the Insert, Update, and Delete actions.
UPC A Creator In C#
Using Barcode generator for VS .NET Control to generate, create GTIN - 12 image in VS .NET applications.
www.OnBarcode.com
Generating Code 39 In None
Using Barcode printer for Office Word Control to generate, create Code 39 image in Office Word applications.
www.OnBarcode.com
Figure 10-10. The Athlete entity in the model
Figure 10-11. The Athlete table with some basic information about athletes To map stored procedures to the Insert, Update, and Delete actions for the Athlete entity, do the following: 1. 2. In your database, create the stored procedures in Listing 10-19. Right-click the design surface and select Update Model from Database. Select the new stored procedures from Listing 10-19 and click Finish. This will add the stored procedures to the model. Right-click the Athlete Entity and select Stored Procedure Mapping. Select the stored procedures for each of the actions. For the Insert action, map the return column AthleteId for the Insert action to the AthleteId property (see Figure 10-12).
STORED PROCEDURES
Listing 10-19. The stored procedures for the Insert, Update, and Delete actions create procedure [chapter10].[InsertAthlete] (@Name varchar(50), @Height int, @Weight int) as begin insert into 10.Athlete values (@Name, @Height, @Weight) select SCOPE_IDENTITY() as AthleteId end go create procedure [chapter10].[UpdateAthlete] (@AthleteId int, @Name varchar(50), @Height int, @Weight int) as begin update 10.Athlete set Name = @Name, Height = @Height, [Weight] = @Weight where AthleteId = @AthleteId end go create procedure [chapter10].[DeleteAthlete] (@AthleteId int) as begin delete from 10.Athlete where AthleteId = @AthleteId end
Figure 10-12. Mapping the stored procedures, parameters, and return values for the Insert, Update, and Delete actions
STORED PROCEDURES
How It Works
We updated the model with the stored procedures we created in the database. This makes the stored procedures available for use in the model. Once we have the stored procedures available in the model, we mapped them to the Insert, Update, and Delete actions for the entity. In this recipe, the stored procedures are about as simple as you can get. They take in properties as parameters and perform the action. For the Insert stored procedure, we need to return the stored generated key for the entity. In this recipe, the stored generated key is just an identity column. We need to return this from the stored procedure for the Insert action and map this returned value to the AthleteId property. This is an important step. Without this, Entity Framework would not be able to get the entity key for the instance of the Athlete entity just inserted.
When do I map stored procedures to the actions
In most cases, Entity Framework will generate efficient code for the Insert, Update, and Delete actions. When would I ever need to replace this with my own stored procedures Here are the best practice reasons why. * Your company requires you to use stored procedures for some or all of the Insert, Update, or Delete activity for certain tables. * You have additional tasks to do during one or more of the actions. For example, you might want to manage an audit trail or perform some complex business logic or perhaps leverage a user s privileges to execute stored procedures for security checking. * Your entity is based on a QueryView (see s 6 and 15) that requires you to map some or all of the actions to stored procedures.
The code in Listing 10-20 demonstrates inserting, deleting, and updating in the model. The code isn t any different because of the mapping of the actions. And that s fine. The fact that we have replaced the code that Entity Framework would have dynamically generated with our own stored procedures should not affect the code that uses the entity. Listing 10-20. Executing the Insert, Update, and Delete actions using (var context = new EFRecipesEntities()) { context.Athletes.AddObject(new Athlete { Name = "Nancy Steward", Height = 167, Weight = 53 }); context.Athletes.AddObject(new Athlete { Name = "Rob Achers", Height = 170, Weight = 77 }); context.Athletes.AddObject(new Athlete { Name = "Chuck Sanders", Height = 171, Weight = 82 }); context.Athletes.AddObject(new Athlete { Name = "Nancy Rodgers", Height = 166, Weight = 59 }); context.SaveChanges(); }
Copyright © OnBarcode.com . All rights reserved.