I added am edmx file and a table to my project. How can I get it to generate CRUD operations? I did this in the past where it generated them as stored procs, but cant find the option on the table properties. What did I do wrong?
UPDATE
After fiddling about, I discovered I am confusing my tools. With a DataSet.xsd I can drag a table onto the Dataset Designer and click the *TableName*TableAdapter. If you view the properties window you will see "DeleteCommand, InsertCommand, SelectCommand, UpdateCommand". Is there a way to accomplish this task with Entity Framework too?
(If you have any trouble seeing this you can right click the table in dataset designer > Configure > Advanced options > check "Generate Insert, Update and Delete statements".
Since no one has responded with a method to accomplish the task, then I have to assume the functionality does not exist.
Related
I created a database on access and added the data source to my visual studio vb project. However, I have recently added some new fields and tables on my database, how do I update it on my visual basic project without having to delete it and add it as a new data source which caused problems to my programs integrity ?
You can re-run the wizard and update the DataSet schema from the Data Sources window. I'm not in a position to test right now but, if memory serves, you can right-click the specific Data Source and select the appropriate item from the menu. If not, it would be a button on the toolbar in that window.
I don't think you need to change the data source, as the data source just refers to the database which has not changed. Ideally, the changes within the database should have reflected in the appropriate DataSet or DataCoulmn in your code. Can you post the code here, so that we can understand exactly what is going wrong?
In Eclipse, I try to create entity classes based on an existing database schema.
The wizard works until the end and creates the appropriate classes.
Except for one thing. Some classes are not being found by code as they're not generated.
In the "Customize individual entities" dialog, all the tables show up. Some of them don't have any columns being displayed in this dialog.
What works:
I can create relationships, even to these "missing" columns
I see these tables in Eclipses "Data Source Explorer"
The exact same columns don't appear in the JPA conversion dialog. The table has no arrow to further expand the item in the GUI.
I've already created a new workspace - without the success I'm looking for.
Why?
I'm using Microsoft SQL Server with the original sqljdbc4.jar
Although I have no idea why it happens, I finally know how to fix it:
In the Data Source Explorer, just expand the nodes in the tree until you see all the tables and their respective columns.
Somehow, they don't get loaded in the wizard. But they seem to do when opened in the data source explorer.
Afterwards, they also show up in the wizard.
Disconnecting and reconnecting using the Data Source Explorer fixed it for us.
In Entity Framework, I always use the Update module from Database option, but It's not covering all kind of updates, sometimes it's more easier to delete the EF and add it back than fixing and verifying whether this option reflected the updates or not,
In my current project i have added a Self-Join relation and then i used the Update module from Database option, but it didn't update it correctly,
I can find that table and the new relation in the Module diagram but in the code behind it's not reflecting the update correctly, This time i have my custom changes on the EF? It is not possible to delete and add again this time, My question is:
Is there any reliable and easy way to update the EF from DB without
using third party tools?
After clicking the Update module from Database , Two clicks are needed, orderly:
Right Click on the .tt file and choose Run Custom Tool. Wait Until is Finished.
Right Click on the .Context.tt file and choose Run Custom Tool. Wait Until is Finished.
I used this method in Visual Studio 2012 for many scenarios and it's updating fine with no errors.
Hope this helps.
I have an application that uses a database with one table currently. I want to add another column to the table. According to this post(http://www.asp.net/mvc/tutorials/getting-started-with-mvc3-part7-cs), there are 2 ways to modify the database: 1. Have EF drop and recreate the db or 2. Explicitly modify the db. Unfortunately, they go over the first method.
What is the correct / easiest way to do the second method if I have a table called Team?
The columns I have are TeamID, TeamAbbreviation, TeamCity, TeamName and TeamDisplayName. I want to add TeamSmallLogoUrl.
To do the second method, just go modify the DB and add your column. Then open the EDMX file in VS (double-click it in the Solution Explorer) and right-click on it when it opens up then choose "Update Model from Database" from the context menu. Click Finish. It'll pick up your added column.
Assuming you are using code-first (hence the EF-4.1 title):
If you are still in development phase and there are no important data in the database, use the Drop-Recreate method. (this is also the easiest way).
If you have some data in the database, just do this manually. The names of the properties and class should match/map directly unto your database schema. (if not mapped, EF will throw an error anyways)
Just a basic question. Learning Linq to SQL and some nHibernate. I am using the mvc tutorial and they drag and drop tables onto the visual studio designer to create the classes and wire up everything.
When I experimented with nHibernate I had to do lots with xml files. Does nHibernate have anything that is "easy" like Linq to SQL or is this drag and drop for Linq to SQL so basic that when I want to do something "real" it won't matter that Visual Studio does this for me (at this basic level)? In other words, the further I go with Linq to SQL, I'll eventually have to handle config files like I do with nHibernate.
Look at Castle's ActiveRecord framework. It replaces the use of XML config files with the use of Attributes directly on the class/property declaration. Also, a tool called ActiveWriter integrates with Visual Studio and allows connecting to a data source and generating the object model!
There is no "native" support like you see with LINQ to SQL. However, there are third party add-ins that will allow you to do something similar with nHibernate. My favorite is this one:
http://sourceforge.net/projects/nhibernateaddin
To use it:
Create a data connection to a
database that contains the structure
you are going to code against (your
development database).
Add a new NHibernate plug-in item
(via add new item) to your project
that will contain you domain objects.
In the property window add the data
connection string from the data
connection you just created (this
isn't automated yet).
Finally, you drag and drop your tables
from your data connection to the
NHibernate plug-in object and when
saved your mapping files and you
domain objects are generated. To use
it you create a data connection to a
database that contains the structure
you are going to code against (your
development database).