Entity frameworks101
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This document provides an overview of Entity Frameworks (EF), an object-relational mapper (ORM) that allows mapping of objects to SQL databases in Visual Studio. It discusses benefits of EF like reduced development time and better object design. It also discusses how EF integrates with ASP.NET MVC and the process of creating an EF model, generating a database from the model, and populating tables.
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Patterns (contd)Software Development ProcessDesign patte.docxdanhaley45372 Patterns (contd)
Software Development Process
Design patterns used to handle change
More time extending and changing code than developing it.
The Strategy design pattern handle change by selecting from a family of external algorithms rather than rewrite.
Design point: Make code closed for modification of code, but open for extension
Problem
Computer object created
Description Method returns
Getting a Computer
Problem
Program has to change every time
Customer changes options
Decorator Pattern
Wrapper code used to extend your core code
Extend a class dynamically at runtime
Decorator uses wrapper code to extend core functionality - decorating the code
Decorator Pattern
description() returns “You are getting a computer”
Wrapper description() returns
“You are getting a computer and a disk”
Wrapper description() returns
“You are getting a computer and a disk and a monitor”
Decorator Pattern
Core component: Computer
Variables holding computer objects should also be able to hold objects that wrap computer objects.
Extend the wrapper classes from the Computer class.
Abstract class cannot be instantiated
Ensures all wrappers are consistent
Developers have to provide their own description
Decorator Pattern
Method calls the core computer object’s
description method and adds “and a disk”
Decorator Pattern
Method calls the core computer object’s
description method and adds “and a disk”
Extend the core object by wrapping it in decorator wrappers. Avoids modification of the core code.
Each successive wrapper called the description method of the object it wrapped and added something to it.
Factory Pattern
Based on type, call the
Connection method
Factory Pattern
Create a method that returns the
correct connection type
Factory Pattern
New operator used to create OracleConnection objects.
New operator used to create SqlServerConnection objects, and MySqlConnection objects.
New operator to instantiate many different concrete classes
Code becomes larger and needs to be replicated in many places
Factor that code out into a method.
Code keeps changing
Encapsulate code into a factory object
Goal: Separate out the changeable code and leave the core code closed for modification
Building the Factory
Creating the Factory
FirstFactory class encapsulates the connection object creation
Pass to it the type of connection (“Oracle”, “SQL Server”,)
Use the factory object to create connection objects with a factory method named createConnection
Building the Factory
Create the FirstFactory class.
Save the type of the database, passed to the FirstFactory class’s constructor.
Object-creation code changes
Check which type of object to be created
(OracleConnection, SqlServerConnection,
and then create it.
Factory Class
Create the Abstract Connection Class
Core code should not be modified or has to be modified
as little as possible.
Using the connection object returned by the
new factory object
Use t.
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Entity frameworks101
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- 2. What are Entity Frameworks(EF)? • A Microsoft Object-Oriented Mapper (ORM) that generates the mapping of objects to SQL databases in Visual Studio.
- 3. Benefits of EF Reduced Development time by generation of code and diagrams. Integration into SQL Server and other Microsoft Tools and Frameworks, including Visual Studio. Dealing with business objects instead of SQL code, better Object design. Reduced security risks by not having dangling SQL scripts.
- 4. ASP.NET MVC Is Microsoft's framework in support of the Model- View-Controller, the most popular design pattern in the world for rapid development. Entity Frameworks are used heavily with ASP.NET MVC, but they are a completely seperate framework that are used independently as well.
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- 8. EF Creation
- 9. DB Creation We can create a DB from code,called code-first, including a table and populate the table will a fields. By default, it will default to the local instance of .SQLExpress. We can also create tables and add fields from a Entity model as well, which is the mapping of the Entity objects.
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- 12. Program Code Example code of creating the DB, tables and adding fields.
- 13. Created the DB
- 14. Creating an EF Model
- 16. Add a Data Model
- 17. Generate from DB
- 18. Set the Entity Name
- 19. We can visually view the models
- 20. We can delete the tables, not DB
- 21. Let's generate the tables from the models
- 22. Visual Studio builds the SQL for the table
- 23. Let's run the SQL from Visual Studio
- 24. The tables were built from the EF models
- 26. The models have been previously created
- 27. Populating Instead of DBContext, the generic context, we use the specific DB context that we defined when creating models, called MyNewTableEntities.
- 28. Let's add a row to the Address table
- 29. Done....