Is there a way to use stored procedures without using the Entity Framework function mapping, which is great but is a complete load of rubbish when any changes are added to the stored procedure, I am aware you can refresh the stored procedure mapping but it's just not efficient. Most of the time when you update your mappings it does not pick up the changes which is extremely annoying.
so far I have tried the following:
var List = db.ExecuteStoreQuery<Business_Voucher_Top5_Result1>("exec usp_BusinessVoucher_Top5");
this works great but can I do it without creating the mapping and pass parameters to it?
Thanks
You don't need to create mapping for ExecuteStoreQuery - you just need to use a type which has properties with same names as columns in the result set.
Related
Sometimes I need to invoke a stored procedure in my code. Entity Framework will happily do this for me as follows:
MyDbContext db = new MyDbContext();
db.Database.ExecuteSqlCommand("EXEC MyProc;");
This particular proc doesn't return a value - it just does some updating, so no return value required in this instance.
The problem I have with this is that the reference to the proc is embedded in a string, and I like to avoid this where possible. If I change the name of the proc, add extra parameters, or delete the proc entirely, I won't be aware of the broken reference until I hit that line of code at run-time.
What options do I have for invoking a stored procedure with a strong reference? I have my procedures defined in a database project within the same solution, and I also use a reverse POCO generator (which apparently will also reverse POCO procs, but I haven't tried it yet).
I'm interested to hear the various ways in which others tackle this problem - either with the tools listed above, or with others.
I am working on a project using entity framework code first approach, I have a situation where I need to call a stored procedure which returns multiple table, hence I want to map the result to my model. please tell me if its possible to do it and if yes then how can i do it.
Code First currently only supports mapping to tables. This unfortunately means
that you can’t map Code First directly to stored procedures, views, or other database
objects. If you are letting Code First generate a database, there is no way to
create these artifacts in the database, other than manually adding them once Code
First has created the database. If you are mapping to an existing database, there
are some techniques you can use to get data from non-table database artifacts.
i am also facing the same problem and not able to get any solution, so i called stored procedure using ExecuteReader and then mapped it to models using autoMapper.
Let me know if you are looking for code
I'd like to run a stored procedure (for performance issues I preferred stored procedures) and at the end I'd like to have module like the one below.
Do you also think in order to achieve this stored procedure is a better solution?
And, if I use a stored procedure, I'd like to preserve my EF structure. So, I probably need to convert the DataTable from the stored procedure into the EF class structure.
Does .NET have some sort of method that handles this conversion or do I have to build up something myself?
And once again, do you really think to do this with a stored procedure is better approach than getting the data over EF, and develop some algorithm on ASP.NET C# to make it look like the one on the picture I uploaded? And if you could also provide WHY, that would be really awesome.
Thank you very much
Why do you want to convert a DataTable to an EF entity? You don't have to use a DataTable to get the results from a stored procedure, you can retrieve EF objects directly from stored procedures
Have a look at this article
Stored Procedures in the Entity Framework
I use .NET entity framework and mapped my database tables to it. i used stored procedures for insert,update, delete.
then I used EntityDataSource in an ASP.NET application which updates a table.
I don't change all the fields of the entity. there are some fields left unused.
the problem is that when the EntityDataSource performs Update Command. It tries to update ALL fields in the entity. so unused fields receive wrong values.
Is There any simple solution using entity framework designer ?
for example can i use original values for non-modified fields?
Don't use a stored procedure.
Unfortunately that's the only answer I have. A SP expects to get the values it's putting in, you can't tell it to only call with some of the parameters filled in.
If you're just letting EF do the updates without a SP, it should be able to handle this more intelligently.
I have a Stored Procedure that returns a dynamic result set based on a temporary table. My project uses LINQ for Data Access, but I can't incorporate LINQ with this Stored Procedure because it has a dynamic "shape" (I can't say before hand which columns will come back or how many there will be), so LINQ can't generate at design time an object that can hold the results.
I am trying to integrate the stored procedure the old fashioned was, using SQLDataAdapter and such, but I was hoping that I could still tie into LINQ so that I don't need to manage a separate transaction mechanism as that would be a disaster.
Is this possible? Thanks.
One best practice is that a stored procedure should never be coded such that it gives different columns in a result set based on inputs.
It sounds like your design is causing the single stored proc to try and do too many things. I'd highly suggest you change this.
First - you aren't using "LINQ" for data access. My guess is you are using Entity Framework for data access. If you are, it depends on which version of EF you are using.
New in Entity Framework 4 is shaping data from a stored proc. For step-by-step instructions, see this blog post: http://blogs.msdn.com/b/nihitk/archive/2010/04/23/ado-net-entity-designer-in-vs-2010-stored-procedure-return-type-shape-sensing.aspx
If you are using Entity Framework 1, which comes with .NET 3.5, then no EF does not have the ability to sense the shape of the stored proc data.