EF核心代码优先-聚集索引和标识列 [英] EF Core Code First - Clustered Index and Identity Column

问题描述

我正在使用EF Core 2.0创建一个表，其中主键为GUID，聚簇索引为自动递增的INT列.但是我遇到了这个错误:

I am using EF Core 2.0 to create a table in which the primary key is a GUID and the clustered index is an auto-incrementing INT column. But I'm getting this error:

不能在表"Tenants"上创建多个聚集索引.在创建另一个聚簇索引"PK_Tenants"之前，先删除它

Cannot create more than one clustered index on table 'Tenants'. Drop the existing clustered index 'PK_Tenants' before creating another

这是用于创建实体和Fluent API的代码.

This is the code for creating entity and Fluent API.

Tenant.cs

public class Tenant : EntityBase
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ClusteredId { get; set; }
    public new Guid TenantId { get; set; }

    public string TenantCode { get; set; }
}

FluentAPI

protected override void OnModelCreating(ModelBuilder builder)
{
        builder.Entity<Tenant>().HasIndex(c => c.TenantId).ForSqlServerIsClustered(false);
        builder.Entity<Tenant>().HasIndex(c => c.ClusteredId).HasName("ClusteredId").ForSqlServerIsClustered(true);

        base.OnModelCreating(builder);
}

请提出建议，如何消除此错误并为GUID创建主键，并为自动递增INT列创建聚簇索引.

Please suggest, how to remove this error and create primary key for GUID and clustered index for auto-incrementing INT column.

谢谢.

推荐答案

PK索引未明确维护.在EF Core中，可以通过KeyBuilder fluent API对其进行配置(请注意，用HasKey代替HasIndex):

The PK index is not maintained explicitly. In EF Core it can be configured via KeyBuilder fluent API (note the HasKey in place of HasIndex):

    builder.Entity<Tenant>().HasKey(c => c.TenantId).ForSqlServerIsClustered(false);
    builder.Entity<Tenant>().HasIndex(c => c.ClusteredId).HasName("ClusteredId").ForSqlServerIsClustered(true);

这篇关于EF核心代码优先-聚集索引和标识列的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！