I writing data access layer using ado.net entity. But I want do it by manual (not generate code by tool).
I need help how to do it, how many step and example.
You may want to have a look at Entity Framework Code First. See EF 4.1 Code First Walkthrough
Related
In my recent interview, my interviewer we asked about approaches in entity Framework I told them code first and table first. Is there any approaches pending.
We can use three type of entity framework approach as per project requirement.
Database First:
An existing database can be used
Code can be auto-generated.
Extensible using partial classes/ T4 templates
The developer can update the database manually
There is a very good designer, which sync with the underlining database
http://www.entityframeworktutorial.net/database-first-with-entity-framework.aspx
Code First:
There is full control of the model from the Code; no EDMX/designer
No manual intervention to DB is required
The database is used for data only
http://www.entityframeworktutorial.net/code-first/what-is-code-first.aspx
Model First:
Good support with EDMX designer
We can visually create the database model
EF generates the Code and database script
Extensible through partial classes
I'm working on a project using entity framework 6. At the start of the project I was a beginner with EF and choose to build with EF model first.
Now the model is quite big and I’m thinking about performance and ease to change the model without dropping the databases every time.
I thinking about switching to code first.
Given that model first has already generated all the classes I need and context, I don't think it's that difficult to switch to code first.
Nevertheless I would like to know what would be the best way to do that and if there will be real advantage in term of performance and ease of model modification.
Thanks for your help,
EF 6.1 tooling now allows creating a Code First model from the database. Here is a short video and a walkthrough showing the functionality. You can download the latest EF tooling from the download center.
The code created by EDMX is not same as Fluent API although it is closed to Data Annotations.
If you would like to work with Fluent API, you can use Entity Framework Power Tools Beta 4 to generate to Fluent API from Database.
I'm using EF 5.0 and diagram modeler (*.edmx) to create schema and generating database from model, and I was wondering if there is any way to create index on some property (only) via this modeler.
Many thanks for answer or advice.
//edit
I'm working on it, if I success, I'll share a little "how to".
Here is an article about Model-First in the Entity Framework 4
Read the sections about Generating the DDL and Influencing the DDL Generation
Update
Take a look at this example too: Entity Framework Part 5 Model First : Create a database with the Complex Types.
We have a project driven by database design. And when someone makes a db modification, I would like to have my EF code updated. So, I was wondering if there is a way to programmatically generate EF source code given a database connection string. I then plan on attaching this generated EF source code to my solution. I don't need an exact solution right now, but if anyone can point me in the right direction, that would be great.
Thanks!
You could query the SQL Server system tables and generate code that way, perhaps using XML and XSLT or T4 templates.
http://msdn.microsoft.com/en-us/library/ms189082(v=sql.105).aspx
There are three approaches to Entity Framework Development: Database First, Model First, and Code First. You are using Database first.
Entity Framework Development Approaches
I recomend Julia Lerman's book Programming Entity Framework 2nd Edition.
The tutorial I've linked to is for Code First but it has a nice introduction to Repository and Unit Of Work Patterns which you will want to know when using any of the three approaches.
There are a lot of Sql table -> C# class methodologies, but I'm looking for the reverse.
Hypothetical situation:
I have N classes populated by some web service I consume, manipulate, then preform an action on. Now the boss wants said web service data persisted in a database.
I already have the classes defined, how can I quickly and easily (aka, lazily) generate a sql table off of each class?
Entity Framework and nHibernate both allow you to use them in "code-first" mode, which involves writing classes then generating databases.
There is a walk-through of this on ScottGu's blog here: http://weblogs.asp.net/scottgu/archive/2010/07/16/code-first-development-with-entity-framework-4.aspx
you can use MS Entity Framework Code First approach:
Code First allows you to define your model using C# or VB.Net classes,
optionally additional configuration can be performed using attributes
on your classes and properties or by using a Fluent API. Your model
can be used to generate a database schema or to map to an existing
database.
read more about it here: EF 4.1 Code First Walkthrough
Entity framework 4 has a code first development feature, I haven't used it so can't really recommend it
ScottGu blog