Create Stored Procedures using Entity Framework Code First?

问题

I am using Entity Framework Code First in my current project. A Database consists of many tables, many views, and many functions. I am able to create tables using Entity Framework Code First. But I am unable to find a way to create stored procedures using Entity Framework Code First. I know Database-First strategy will fulfill my requirement and everything works well, but I don’t want to use Database-First strategy into my existing project code.

Please help me someone, what are the best ways to create stored procedures using Entity Framework Code First strategy?

回答1:

Instead of using StringBuilder you can use existing EF methods

public override void Up() 
{
  CreateStoredProcedure(
    "MyStoredProcedure",
    p => new
    {
        id = p.Int()
    },
    @"SELECT some-data FROM my-table WHERE id = @id"
  );
}

public override void Down() 
{
  DropStoredProcedure("MyStoredProcedure");
}

回答2:

With Code First, you always make Migrations. Migrations inherits from DbMigration object, which has a very usefull method:

DbMigration.Sql(string)

Here are the steps:

1) Open the Package Manager Console from NuGet Package Manager

2) Type add-migration CreateHelloWorldStoredProcedureExample

3) The Visual Studio would show you a new class with two empty methods: Up and Down

4) In Up method, write your code, here is an example

 public override void Up()
 {
        StringBuilder storedProcedureCode = new StringBuilder();

        storedProcedureCode.Append("CREATE PROCEDURE dbo.HelloWorld" + Environment.NewLine);
        storedProcedureCode.Append("AS" + Environment.NewLine);
        storedProcedureCode.Append("BEGIN" + Environment.NewLine);
        storedProcedureCode.Append(@"SELECT 'Hello World'" + Environment.NewLine);
        storedProcedureCode.Append("END" + Environment.NewLine);

        this.Sql(storedProcedureCode.ToString());
}

While in Down method:

public override void Down()
    {
        this.Sql("DROP PROCEDURE dbo.HelloWorld ");
    }

After this, just run update-database and thats it!

Note: In case you use SQL Server, avoid the use of GO sentence.

回答3:

If you are using EF Core 2.1, you can create stored procedure in such way:

public partial class AddStoredProcedure : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.Sql(@"your create procedure statement");
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.Sql(@"your drop procedure statement");
    }
}

来源：https://stackoverflow.com/questions/20715292/create-stored-procedures-using-entity-framework-code-first

标签

sql-server

ef-code-first