I have stored Procedure getSalesOrder() returning a row structure like this:
Order (map with EF), customfield1 , customfield2 ,customfield3.
How can i use EntityFramework to get the order, and custom Fields Values ?
With the currently shipping Entity Framework, you can't. Stored procedures returning scalar values is, I believe, a feature scheduled for the .NET framework 4.0.
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I have a database first setup in .net6
I need to call a stored proc (Lets say it is called GetMyData)
The stored proc is going to return 5 columns from various tables and so does not map to a current entity model.
The only things I can find is to use the context model to return a stored proc result but that will not work as the result set does not map to an existing model. Or a convoluted ADO.Net style call that looks horrific and needs lots of code.
Is there a simple way to call a stored proc that returns various columns from many tables?
Say I have EntityFramework Core 2.1.14.
Say I have to integrate data into a legacy MySql database which was created by a self-taught.
Say also that one of the tables in this database has a surrogate key field that is generated on Add.
Say then that I want to use context.SaveChanges() to handle the Insert DML generation for me because I want to be lazy and because these tables are messy.
Say finally that I do not want Entity Framework to perform a follow-up query to retrieve this surrogate field; I don't care what it is. I just need it generated on insert.
How would one call context.SaveChanges() with an Added object having a property configured as .ValueGeneratedOnAdd() but also instruct Entity Framework to do nothing but generate my INSERT ? I don't want it to return the id.
I have a stored procedure that gets many input parameters (the procedure persoms Insert statement)
I use EF to access this procedure.
Is there a way to automatically generate object type that contains all the input parameters of the procedure?
Something like the complex type that is being generated for the output of the procedure.
My EF version is 6.1.3
No, I don't think it's possible to automatically generate a class for the input parameters of a stored procedure in EF 6.1.3.
This article helped me in working with insert stored procedure with the entity framework:
http://www.entityframeworktutorial.net/EntityFramework5/CRUD-using-stored-procedures.aspx
I have tables with 2 level hierarchy, Parent->Child->GrandChild
I have create stored procedure with three table valued input parameter ParentTable, ChildTable, GrandChild Table.
Now, I want to consume it in .net using entity framework.
Solution all over internet is, create DataTable in .net , store data in it and pass the same as parameter in stored procedure.
But, I want to use entities instead of data table as data is stored in entity objects. Please suggest. Many Thanks.
You need to have look at this question
Create data table from entities and then pass it to the stored procedure. I haven't tried the code, just showing you the path to go. I hope it may help, looking for better solution.
I've created a function import that returns the results of a stored proceedure as one of my entities. however I can't seem to traverse my through navigation properties to access the data in other entities. I know that you can use include() for objectQueries but can't find anything that will force the EF to load my relations for entity results of function imports.
Any ideas??
Thanks in advance.
This is not possible in EF 1.0
The reason is that EF will consider stored procedure values to be just values and not navigation properites.
For example, Employee entity has multiple Order entities. In Order you have a property called EmployeeID. When the database fills your query using include statements, it creates 1 projection query in SQL to populate all of the Order data that a particular Employee could have.
So if I said
var employee = context.Employees.Include("Orders").Where(e => e.ID == 1).First();
var orders = employee.Orders;
The SQL for the first query will create a projection query which will contain orders where the EmployeeID = 1.
Now when your stored procedure runs, this can do any code behind the scenes (in otherwords it can return any set of data). So when SQL runs the stored procedure, it just runs the code in that stored procedure and does not have any knowledge that EmployeeID on Order is an FK to that property. Additionally, if your stored procedure returns an Employee entity, then you are looking at another scenario where you will not even have an OrderID to pursue.
To work around this though, you can setup your query in EF using Include statements that can mirror any stored procedure. If you use the proper mix of .Select and .Include statements you should be able to do the same thing.