Stored Procedures can't return values by definition but we can get a value from the Stored Procedure by means of output parameters - whose state is modified after a Stored Procedure is executed and we can . In this post I will show how you can call stored procedures with OUTPUT parameters from EF Core. To use this method with a transaction, first call BeginTransaction(DatabaseFacade, IsolationLevel) or UseTransaction. The return value of function is integer value, So here I have selected our "Scalars" property. Then we are assigning the value to the Output parameter. If you embed a full parameter placeholder (@p0) in your example, you need to provide a DbParameter instance, not a value (_id).Otherwise you can also use {0} and pass a value. It was answered by Jonathan Wood on 2022-03-05. Modified entities in the change tracker change the database on SaveChanges. It is not necessary to relink the gateway or define the procedure to the gateway, but the procedure's access privileges must permit access by the gateway. Entity framework stored procedure return value 1. int? So to fetch data, you can use a separate FETCH statements for each cursor. [SP_GET_TOP_IDS] ( @Top int, @OverallCount INT OUTPUT . This method returns an integer value of the number of rows affected by the statement in that stored procedure. The only problem is that the return value isn't the result of the query, but the number of records returned, which is just 1. For example, if you want to execute insert, update or delete query or stored procedure use ExecuteSqlRaw method. When I use the ExecuteSqlRaw method to insert the record into sqlserver table , not working in . Entity Framework Core allows you to drop down to raw SQL queries when working with a relational database. Below is the code . Database I have made use of the following table Customers with the schema as follows. But unlike FromSqlRaw method, it returns the number of affected rows. 2.3. One of the rules we need to bear in mind when using raw SQL within an EF context is that only queries that begin with a SELECT can be composed with LINQ extension methods. ExecuteSqlCommand is not available in Core 3.0. In order to avoid that, you should use FromSqlInterpolated or ExecuteSqlInterpolated methods. When executing the stored procedure, we pass the variable that . In the "Create a new project" dialog, select "Console App (.NET Core)" Click Next. But it is working in version 2.0 using ExecuteSqlCommand, Please . Let's say we have a stored procedure GetGuestsForDate and we would like to return a model named GuestArrival. Your code with ExecuteSqlInterpolated seems correct. I have already inserted few records in the table. Executing Raw SQL Queries. DbSet.SqlQuery () Use the DbSet.SqlQuery () method to write raw SQL queries which return entity instances. @params is the nvarchar() parameter declaration string which is consists of a list of parameters and parameter data type declarations. a Full Text Search), if the generated SQL is not efficient enough, if you want to make use of existing stored procedures, or if you just prefer to write your own queries in SQL. The first parameter sent to ExecuteSqlRaw is the stored procedure name followed by a comma delimited names of parameters expected by the stored procedure. context.Students.FromSql . To do this, I wrote a small extension method for DbContext . Funciton Import for Stored Procedure sp_getStudentsCountbyCity . . Add function import: Now in this step, we will import a function for the stored procedure. Take a look at the docs for ExecuteSqlRaw and ExecuteSqlInterpolated.. If you call a procedure that returns multiple result sets in PSQL tool, pgAdmin Query tool or another function, the query returns cursor names: SELECT show_cities_multiple (); The result: show_cities_multiple refcursor. Sin embargo, al actualizar o acceder a un nuevoCuando By storing TSQL logic in Stored Procedures and calling the Stored Procedures from EF Core, the DBA can update the queries on his own. it will cause performance problems. Here's a sample on how to call Stored Procedures from EF Core: private static void QueryPetsByType (string type) { using var petContext = new PetContext (); List < Pet > pets = petContext. To use the Entity Framework in the .NET 5.x application, add a package to your EFSample project. By storing TSQL logic in Stored Procedures and calling the Stored Procedures from EF Core, the DBA can update the queries on his own. Select data as DataTable object for a database using Entity Framework. Entity framework stored procedure return value 1 Entity framework stored procedure return value 1. C#. This would create a new console application project in Visual Studio 2019. var results = _context.Contacts.FromSql ("SELECT Id, Name Address, City, State, Zip " + "FROM Contacts " + "WHERE Name IN (@p0, @p1)", name1, name2); FromSql takes a query followed by a list of parameters that should be used in the query's execution. Changes to the code are minimal: [HttpPost ("UpdateProfiles")] public async Task<IActionResult> UpdateProfiles ( [FromBody] int minimalProfileId = 0 . While running a stored procedure or a plain SQL command can be done directly on the database level, returning the result is slightly more complicated. I have covered creating Relationship between Entities using Fluent APIs, check these . In this video we will 1. Limitations. ExecuteReader expects to run a query command or a stored procedure that selects records. cmd.Parameters.Add ( "@retValue", System.Data.SqlDbType.Int).Direction = System.Data.ParameterDirection. Refer below example. This question was posted by Jonathan Wood in StackOverflow on 2022-03-05. Use a for loop to iterate through the results. How to execute Stored Procedure in EF Core. While a fascinating approach, this is likely not the best use . But unlike FromSqlRaw() method, it returns the number of affected rows. a full text search), if the generated sql is not efficient enough, if you want to make use of existing stored procedures, or if you just prefer to write your own queries in … Click to see full answer. Especially when you're passing a user-provided data, you are exposed to SQL injection attack. The application will communicate with the database through Entity Framework Core O/RM. DbSet.SqlQuery () Use the DbSet.SqlQuery () method to write raw SQL queries which return entity instances. note: if you where using sqlcommand directly, you would set the command type to stored proc, and use the direction return value. Pinal Dave is an SQL Server Performance Tuning Expert and independent consultant with over 17 years of hands-on experience. SQL queries must return entities of the same type as DbSet<T> type. Alternate way of passing parameters In all the above examples you used index based parameter naming convention. Understand what are stored procedure return values2. NET along with NUnit to create our units tests. %TYPE: If we don't know the parameter variable type, we can use a sort of placeholder called %TYPE to declare the type of this parameter to be dynamic. Inside the event handler, the Stored Procedure is executed using the ADO.Net ExecuteScalar method and the retuned value of the Employee ID is fetched and displayed in a Label control. Entity Framework Core provides mechanisms for executing raw SQL queries directly against the database in circumstances where you cannot use LINQ to represent the query (e.g. ): CREATE OR ALTER PROCEDURE [dbo]. Note that there is also another variant called ExecuteSqlRaw() which is of synchronous type.. var context = new SchoolContext(); var rowsAffected . from sqlalchemy import text text ("YOUR SQL QUERY") Pass the SQL query to the execute () function and get all the results using fetchall () function. Here's a sample on how to call Stored Procedures from EF Core: private static void QueryPetsByType (string type) { using var petContext = new PetContext (); List < Pet > pets = petContext. 50. So you need to use ExecuteSqlRaw with OutPut Parameter. Below is the t-sql syntax of sp_executesql system stored procedure. CREATE TABLE [TableWithIdentityKey] (ID INT IDENTITY (1, 1), Description VARCHAR (128)) DECLARE @IdentityValue AS TABLE (ID INT); INSERT [TableWithIdentityKey] (Description) OUTPUT Inserted.ID INTO @IdentityValue. Go back to the terminal window that should still be open in the EFSample folder. a Full Text Search), if the generated SQL is not efficient enough, if you want to make use of existing stored procedures, or if you just prefer to write your own queries in SQL. Ask Question Asked 2 months ago. VALUES ('Test Description') SELECT ID FROM @IdentityValue. Note Here, I have imported a function "getStudentsCountbyCity" for stored procedure sp_getStudentCountbyCity. The SQL query must return data for all the properties of the entity. The return value of ExecuteSqlCommand () is an integer that reveals the number of records affected by the query. Using FromSql, we can execute stored procedure via following way. Note that this method does not start a transaction. If you want the return value of a stored procedure (like shown in the question), then you have to use the EXEC @ReturnValue = [StoredProc] @param1 . DbSet.SqlQuery () Use the DbSet.SqlQuery () method to write raw SQL queries which return entity instances. e.g. This function returns 1 if the field is null and 0 if it contains a non-null value. The above query executes Select * from Students SQL in the database to get all students and will be converted into a list of Student entities. So basically your SQL query should be Select * from {tableName} The column names in the result set must match the column names that properties are mapped to. Now specify the name and location of the project. Therefore, you don't need to pass @p[n] to the OUTPUT arguments but only providing them to the parameters list. from sqlalchemy import text text ("YOUR SQL QUERY") Pass the SQL query to the execute () function and get all the results using fetchall () function. 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