在主键实体框架6.0上创建非聚簇索引 [英] create non clustered index on primary key entity framework 6.0

问题描述

我知道这个，其中声明不可能首先通过代码创建具有非聚簇索引的主键。这是否仍然如此？

I am aware of this, which states that it is not possible to create a primary key with non clustered index via code first. Is this still the case?

理想情况下，我想通过EntityTypeConfiguration指定，我的主键（Guid）具有非聚集索引，还有另一列（ int）与聚集索引。

Ideally, I would like to specify via EntityTypeConfiguration, that my primary key (Guid) has a non-clustered index and there is another column (int) with a clustered index.

推荐答案

AFAIK这不可能与EntityTypeConfiguration。但是，您可以使用Code-First迁移来执行此操作。工作示例：

AFAIK this is not possible with EntityTypeConfiguration. However you can do this with Code-First migrations. Working example:

public class Product
{
    public Guid Id
    { get; set; }

    public int Price
    { get; set; }
}

class AppDbContext : DbContext
{
    public DbSet<Product> Products
    { get; set; }
}

public partial class InitialCreate : DbMigration
{
    public override void Up()
    {
        CreateTable(
            "dbo.Products",
            c => new
                {
                    Id = c.Guid(nullable: false),
                    Price = c.Int(nullable: false),
                })
            .PrimaryKey(t => t.Id, clustered: false)
            .Index(t => t.Price, clustered: true);

    }

    public override void Down()
    {
        DropIndex("dbo.Products", new[] { "Price" });
        DropTable("dbo.Products");
    }
}

结果：

CREATE TABLE [dbo].[Products] (
    [Id]    UNIQUEIDENTIFIER NOT NULL,
    [Price] INT              NOT NULL,
    CONSTRAINT [PK_dbo.Products] PRIMARY KEY NONCLUSTERED ([Id] ASC)
);

GO
CREATE CLUSTERED INDEX [IX_Price]
    ON [dbo].[Products]([Price] ASC);

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