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How to Call Stored Procedures with Parameters in Entity Framework 6 Code-First?
How to Call Stored Procedures with Parameters in Entity Framework 6 Code-First?
Jan 29, 2025 am 01:46 AM
Entity Framework 6 Code-First: Efficiently Calling Stored Procedures with Parameters
In Entity Framework 6's code-first approach, leveraging stored procedures is essential for complex database interactions. A common challenge involves effectively calling stored procedures and managing parameter passing.
Let's illustrate with a stored procedure designed to insert a department:
ALTER PROCEDURE [dbo].[insert_department]
@Name [varchar](100)
AS
BEGIN
INSERT [dbo].[Departments]([Name])
VALUES (@Name)
DECLARE @DeptId int
SELECT @DeptId = [DeptId]
FROM [dbo].[Departments]
WHERE @@ROWCOUNT > 0 AND [DeptId] = SCOPE_IDENTITY()
SELECT t0.[DeptId]
FROM [dbo].[Departments] AS t0
WHERE @@ROWCOUNT > 0 AND t0.[DeptId] = @DeptId
END
To integrate this stored procedure into your Entity Framework context, map it within your model:
modelBuilder
.Entity<department>()
.MapToStoredProcedures(s =>
{
s.Update(u => u.HasName("modify_department")
.Parameter(b => b.Department, "department_id")
.Parameter(b => b.Name, "department_name"))
.Delete(d => d.HasName("delete_department")
.Parameter(b => b.DepartmentId, "department_id"))
.Insert(i => i.HasName("insert_department")
.Parameter(b => b.Name, "department_name"));
});
This mapping allows you to call the stored procedure directly from your DbContext:
this.Database.SqlQuery<department>("insert_department", new SqlParameter("@Name", departmentName));
For stored procedures returning multiple result sets (as shown in the example), consult Microsoft's documentation on "Stored Procedures with Multiple Result Sets" for best practices in handling the returned data. This will provide guidance on efficiently processing the multiple datasets.
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