I have created a database using Entity Framework code first approach, and now I am trying to verify the relations of data tables but unfortunately after wasting 2 days still unable to get any solution.
According to this article the following query solves the problem.
alter authorization on database::[your-db-name-no-quotes] to sa
I tried it and it worked for me.
You might try to use Entity Framework Power Tools that is a Visual Studio add-in that was used to create the data model diagrams shown in these tutorials. The tools can also do other function such as generate entity classes based on the tables in an existing database so that you can use the database with Code First. After you install the tools, some additional options appear in context menus. For example, when you right-click your context class in Solution Explorer, you get an option to generate a diagram. When you're using Code First you can't change the data model in the diagram, but you can move things around to make it easier to understand.
There is a possibility to create a diagram from an existing database. You could use SQL Server Management Studio Express diagram generator. Right-click in diagrams folder in the database and choose create a new diagram.
Please also refer to this answer: Generate table relationship diagram from existing schema (SQL Server)
Related
I'm trying to create a schema, but in Workbench when I add a diagram it shows nothing. I've tried adding tables and nothing shows up. I'm not sure what I'm missing here. Does anyone know why this is occurring?
Diagraming is part of modeling, so it will not affect your live database. Either use modeling then forward-engineer the model/diagram, or simply edit the database/schema with Workbench (and don't use modeling). The latter is simpler and more straight-forward.
Consider the FAQ entry titled How do I create a MySQL database (schema) in MySQL Workbench?
Or if you're goal here is to use modeling, then consider the tutorial titled Creating a Model; and it also shows the forward-engineering procedure.
I need geometry types in my Entity Framework application. I've tried to follow this tutorial but I have had some issues and I'm not sure if it is because the tutorial is old or if I'm doing something wrong.
For example, under "Creating a New Entity C# Code Generation Template" it says
select Entity C# in the "Load from existing template" drop-down list.
The closest thing I can find, how ever, is the "EntityObject" template. Also, the code in the EntityObject template is somewhat different and so I don't know if this will still work.
Also, the link to the template code is down so you have to transcribe the entire picture of code, which is inconvenient (especially if it turns out not to work).
My question is, is there a better/updated way to handle spatial datatypes with entity framework and postgresql in the year of 2013?
Thanks
Support for spatial/geometry data types in Entity Framework 5 and Entity Framework 6 will be available in the next build of dotConnect for PostgreSQL. We plan to release the nearest build in a week or two.
I am currently in process of putting a process (using a windows application) in place where EF's POCO objects classes can be generated by pointing this app to the database table(s).
I have seen T4 templates and the VS Addin which helps to achieve this in VS. However it requires T4 template file on the VS solution. We do not want to go through this route. What we want is to just copy the classes generated by this app to the solution so it can be used.
The way T4 template works is that as soon as you make a change in the template it applies to the Class file. What I would like to do is to point the new App to the database and say tables A,B,C. The app will read the columns,types,relationships and create corresponding classes to a folder. Developer then Copy these classes and paste into VS solution. Longer terms plan then to extend this app to write repository classes.
I have rough idea but not a clear picture. Does anyone has any pointers about how about can I go to achieve this?
Thanks
Edit: This is purely in mind using EF Code first.
What it seems you are asking is "Can my T4 templates live in a separate solution to my output code?".
Yes. You can do that.
I was just reading Asp.net MVC3 tutorials (Models (Data))
On this page tutorial 4 of 10 on the ASP.NET website, it is shown that an entity diagram is created from code first classes. How to generate them?
This can be done very easily by using the Class Diagram. Add New Item > Class Diagram. Then drag and drop your code first classes into the diagram from the solution explorer.
A Class Diagram is OK, but it doesn't automatically show the relationships between classes. The slickest way that I have used is Entity Framework Power Tools. Their description of the tool:
When right-clicking on a C# project, the following context menu function is supported: 1) Reverse Engineer Code First - Generates POCO classes, derived DbContext and Code First mapping for an existing database.
Assuming your schema has been created from the Code First classes you can reverse the db into a an edmx to visualise the Model. Any classes generated from this obviously won't be related to your Code First classes though.
Create a copy of your project. Open the copy and add a new item/ADO.NET Entity Data Model. Edit the diagram for layout and print to a .pdf file. Delete the copy of the project.
Anytime you make a change you will have to re-create the diagram and edit the layout, but I can usually get through the whole process in about 15 minutes.
I'm not sure if I have worded this question properly I will explain what I am trying to acheieve further.
I am looking to create a graphical representation of an existing database showing table relationships Key relationships etc.
I have seen posts around the internet that suggest you can just go; New > Database Diagram. But I have seen nothing to this effect in Management Studio
Something similar to this:
You first need to install the Diagram Support objects. Then you all you expand the database out and right click the Database Diagram folder
If there is an database diagram drawn for the database it should be visible if you collapse DataBase Diagrams under your database. If you are trying to create one that is the way to go about it create new database diagram.