Indexing 使用带有GUID主键的Entity Framework Core 5.0.4创建非聚集索引
我有这个实体类:Indexing 使用带有GUID主键的Entity Framework Core 5.0.4创建非聚集索引,indexing,entity-framework-core,primary-key,clustered-index,non-clustered-index,Indexing,Entity Framework Core,Primary Key,Clustered Index,Non Clustered Index,我有这个实体类: public class StatusCode { public const String ClassName = nameof(StatusCode); [Key] public Guid UniqueID { get; set; } // Primary Key public Char Level { get; set; } // R=Root, C=Code Gr
public class StatusCode
{
public const String ClassName = nameof(StatusCode);
[Key]
public Guid UniqueID { get; set; } // Primary Key
public Char Level { get; set; } // R=Root, C=Code Group, I=Item
public Guid CodeGroup { get; set; } // F Key - Which group of codes this code belongs to (self reference to this table)
public String Code { get; set; } // Public short form code, normal public use in tabular reports
public String FullName { get; set; } // Full public name, normal public stand alone display
public String Description { get; set; } // Description displayed to explain this code to the public, typically a full sentance
public String PublicRemarks { get; set; } // Longer public remark about this code, typically a few paragraphs
public String PrivateRemarks { get; set; } // Internal use only remark, for display to administrators about the usage of this code
public Boolean AvailableYesNo { get; set; } // Flag to show if this code is available for usage on new records
public DateTime AvailableFrom { get; set; } // Date time that this code is available for first use
public DateTime AvailableTo { get; set; } // Date time that this code is no longer available for use
}
通过此迁移:
protected override void Up(MigrationBuilder migrationBuilder)
{
String lLogHdr = $"{ClassName}.{HCG_Misc.CallingMethodName()} ";
Console.WriteLine( $"{lLogHdr} - Start" );
migrationBuilder.CreateTable(
name: "StatusCode",
columns: table => new
{
UniqueID = table.Column<Guid >( type: "uniqueidentifier", nullable: false ),
Level = table.Column<string >( type: "nvarchar(1)" , nullable: false ),
CodeGroup = table.Column<Guid >( type: "uniqueidentifier", nullable: false ),
Code = table.Column<string >( type: "nvarchar(450)" , nullable: true ),
FullName = table.Column<string >( type: "nvarchar(max)" , nullable: true ),
Description = table.Column<string >( type: "nvarchar(max)" , nullable: true ),
PublicRemarks = table.Column<string >( type: "nvarchar(max)" , nullable: true ),
PrivateRemarks = table.Column<string >( type: "nvarchar(max)" , nullable: true ),
AvailableYesNo = table.Column<bool >( type: "bit" , nullable: false ),
AvailableFrom = table.Column<DateTime>( type: "datetime2" , nullable: false ),
AvailableTo = table.Column<DateTime>( type: "datetime2" , nullable: false )
},
constraints: table => { table.PrimaryKey("PK_StatusCode_UniqueID", x => x.UniqueID);
});
migrationBuilder.CreateIndex( name: "Index_StatusCode_Code" , table: "StatusCode", column: "Code" );
migrationBuilder.CreateIndex( name: "Index_StatusCode_CodeGroup", table: "StatusCode", column: "CodeGroup" );
Console.WriteLine( $"{lLogHdr} - Complete" );
}
我得到一个带有聚集主键索引的数据库表,这是GUID索引的核心。要获得非聚集索引,我需要做什么?EF Core中的原则是每个数据库提供程序都添加其特定的配置扩展方法。您没有说明要针对哪个数据库,因此假设它是SqlServer,将调用您需要的配置方法并扩展密钥配置(
HasKey
)
因此,您需要添加以下内容
modelBuilder.Entity<StatusCode>()
.HasKey(e => e.UniqueID)
.IsClustered(false);
当应用它时,将创建非聚集PK。谢谢你,伊万,你说的重要一点是。。。“并重新生成迁移”一切正常,感谢您在这方面的帮助:-)
modelBuilder.Entity<StatusCode>()
.HasKey(e => e.UniqueID)
.IsClustered(false);
table.PrimaryKey("PK_StatusCode_UniqueID", x => x.UniqueID)
.Annotation("SqlServer:Clustered", false);