How Can I Call Stored Procedures in Entity Framework 6 Code-First?

Entity Framework 6 Code-First: Integrating Stored Procedures

Enhance your Entity Framework 6 Code-First applications with stored procedures for optimized database interactions and complex operation encapsulation. This guide details how to seamlessly integrate stored procedures into your Code-First workflow.

Procedure Mapping and Execution:

1. Mapping: Within your DbContext's OnModelCreating method, use MapToStoredProcedures to link entities with their corresponding stored procedures. Specify the procedure name and parameters for each action (INSERT, UPDATE, DELETE).

2. Execution: Employ the Database.SqlQuery method to execute the stored procedure. Supply the procedure name and input parameters. If the procedure returns data, cast the result to your entity type.

Illustrative Code Example:

Let's assume a Department entity. The following code demonstrates inserting a department using a stored procedure:

<code class="language-csharp">public class DepartmentContext : DbContext
{
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.Entity<Department>()
            .MapToStoredProcedures(s =>
            {
                s.Insert(i => i.HasName("insert_department")
                                .Parameter(b => b.Name, "department_name"));
                // Add mappings for UPDATE and DELETE procedures here
            });
    }

    public void InsertDepartment(string departmentName)
    {
        var result = this.Database.SqlQuery<Department>(
            "EXEC insert_department @department_name",
            new SqlParameter("@department_name", departmentName));
    }
}</code>

This InsertDepartment method executes the insert_department stored procedure, passing the department name.

Important Considerations:

• Multiple Result Sets: Consult the MSDN documentation for handling stored procedures returning multiple result sets.
• Data Type Matching: Ensure your entity properties align with the stored procedure's output column data types and names.
• Error Handling: Implement robust error handling to gracefully manage exceptions during procedure execution.

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