How to call stored procedure through code first appraoch/DBCONTEXT file.
In code first appraoch, we can create tables and relationship through Model object but, have to create procedures manually into database or any approach avaibale to generate ?
How to call procedure ?
Thank You
Related
I have been working on my code for our activity in our major comp sci subject. The task asks to update a certain field in the table in postgresql using stored procedure
I have already create a gettopemp() to retrieved the data in the table, and I want to retrieve the information of gettopemp() to my new stored procedure updatetopemp(). How to use stored procedure inside the stored procedure ???
If you want to pass a function name as a parameter and call that in your code, you'll have to use dynamic SQL.
I'd like to write a ud-function in my SQL database in order to write procedure logging in a specific table among dbo tables.
I'd like this specific function could be called by any stored procedures inside my database.
I have no idea what kind of solutions I could use. I've learned that only 3 kinds of UDF are avalaible.
Any suggestions ?
Thanks.
A UDF always has to be side-effect free. That means that you cannot change data in a table from within a function.
If you are looking to call your logger from stored procedures, why not implement it as a stored procedure too?
I have a stored procedure that grabs data recursively. I did a function import in my entity set. I can create a function in my ObjectContext that looks like this:
public ObjectResult<ProviderAccountSetting> GetProviderAccountSettings(long providerAccountId)
{
string functionName = "MyContainer.GetProviderAccountSettings";
ObjectParameter providerAccountIdParameter = new ObjectParameter("providerAccountId", providerAccountId);
ObjectResult<ProviderAccountSetting> results = context.ExecuteFunction<ProviderAccountSetting>(functionName, providerAccountIdParameter);
return results;
}
However, I cannot perform a join with LINQ without getting an error. Is there a way to tell Entity Framework to use the stored procedure whenever I access an entity? I would like my stored procedure to be used any time I grab data for that entity. Furthermore, I want it to work with joins. Does Entity Framework support this type of stored-procedure to table mapping? Otherwise, is there a way to join a function import?
Neither of your requirement is possible. You cannot tell EF to use stored procedure every time when you query data. You must manually call your GetProviderAccountSettings to call stored procedure. You also cannot use join (on database side) when using stored procedures (it is even not possible in SQL directly). If you need to join any data to result set of your stored procedure it must be done directly in the procedure and returned as result set. Otherwise you must execute your stored procedure and joined query separately and join them in linq-to-objects.
MSDN
You can define a custom function in the storage model by adding a
Function element that contains a CommandText element to the storage
schema definition language (SSDL) of an .edmx file. A CommandText
element is commonly used to provide functionality similar to that
provided by stored procedures, but the stored procedure is defined in
the .edmx file, not the database.
a) Does custom function simply send native query command ( this command is specified within CommandText element ) to the DB, or does it send a CREATE PROCEDURE command to the DB ( thus stored procedure created in a DB then contains a command specified within CommandText element ), and then in turn calls this DB's stored procedure?
b) What exactly is meant by "the store procedure is defined in the edmx file, not the database"? Perhaps that edmx file contains a blueprint from which it will create appropriate store procedure in the DB?
Thank you
The phrase "the store procedure is defined in the edmx file, not the database" is proceeded with 'similar to that provided by stored procedures'
So if you would create a stored procedure in your database and import it in the CSDL or create a custom function and import it in the CSDL, it won't make a difference for your CSDL.
But if you run SQL Profiler you will see that the CommandText is executed als regular Sql, not as a stored procedure.
I have a stored procedure that returns the temporary table data. because i have used dynamic queries. When i tried to map stored procedure using complex types it returns no columns
how to handle temporary table columns name in complex types?
It is not supported by default because EF always executes SET FMTONLY ON before executing your stored procedure. This option will turn off logic execution - it will only ask for metadata but if logic execution is turned off no temporary table is created and no column's metadata exists.
There are some workarounds.