Question

这是雇员表的主要实体，而迁移外键变得唯一并且不允许表中有重复值。

我需要为exitdetail实体中的单个员工添加多个数据，因此我正在创建从employee表到ExitDetailEntity表的外键引用，但是当迁移且不允许重复。

public class EmployeeDetailEntity : Entity
{
    [Required]
    [StringLength(12)]
    public string EmployeeId { get; set; }

    [Required]
    [StringLength(64)]
    public string FirstName { get; set; }

    [StringLength(64)]
    public string MiddleName { get; set; }

    [StringLength(256)]
    public string FullName { get; set; }

    [StringLength(64)]
    public string LastName { get; set; }
}

此表具有EmployeeDetail的外键引用

public class ExitDetailEntity : Entity
{
    public int EmployeeDetailId {get; set; }
    public EmployeeDetailEntity EmployeeDetail {get; set; }

    public ExitStatusEnum ExitStatus {get; set;}
}

此表具有ExitDetil表的引用

public class ExitDetailAdminEntity : Entity
{
    public int ExitDetailId {get; set; }
    public ExitDetailEntity ExitDetail {get; set; }

    public bool HasTaskCompleted {get; set;}
}

这是exitdetail中引用的枚举

public enum ExitStatusEnum
{
   Active = 0,
   Resigned = 1,
   Requested = 2,
   Cancelled = 3

}

这是exitdetailentity表的迁移命令

migrationBuilder.CreateTable(
            name: "ExitDetail",
            columns: table => new
            {
                Id = table.Column<int>(nullable: false)
                    .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
                CreatedBy = table.Column<string>(maxLength: 32, nullable: false),
                CreatedAt = table.Column<DateTime>(nullable: false),
                ModifiedBy = table.Column<string>(maxLength: 32, nullable: true),
                ModifiedAt = table.Column<DateTime>(nullable: true),
                RowVersion = table.Column<byte[]>(rowVersion: true, nullable: true),
                IsDeleted = table.Column<bool>(nullable: false),
                EmployeeDetailId = table.Column<int>(nullable: false),
                RequestStatus = table.Column<int>(nullable: false),
                ApprovalStatus = table.Column<int>(nullable: false)
            },
            constraints: table =>
            {
                table.PrimaryKey("PK_ExitDetail", x => x.Id);
                table.ForeignKey(
                    name: "FK_ExitDetail_EmployeeDetail_EmployeeDetailId",
                    column: x => x.EmployeeDetailId,
                    principalTable: "EmployeeDetail",
                    principalColumn: "Id",
                    onDelete: ReferentialAction.Cascade);
            });

这是唯一索引变为真的行

 migrationBuilder.CreateIndex(
            name: "IX_ExitDetail_EmployeeDetailId",
            table: "ExitDetail",
            column: "EmployeeDetailId",
            unique: true);

这是我的onmodelcreating方法中的代码

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<LocationCodeTable>().HasQueryFilter(x => !x.IsDeleted);
        modelBuilder.Entity<OfficeCodeTable>().HasQueryFilter(x => !x.IsDeleted);
        modelBuilder.Entity<DivisionCodeTable>().HasQueryFilter(x => !x.IsDeleted);
        modelBuilder.Entity<RoleCodeTable>().HasQueryFilter(x => !x.IsDeleted);
        modelBuilder.Entity<TeamCodeTable>().HasQueryFilter(x => !x.IsDeleted);
        modelBuilder.Entity<FunctionCodeTable>().HasQueryFilter(x => !x.IsDeleted);
        modelBuilder.Entity<DesignationCodeTable>().HasQueryFilter(x => !x.IsDeleted);
        modelBuilder.Entity<LevelCodeTable>().HasQueryFilter(x => !x.IsDeleted);
        modelBuilder.Entity<ShiftCodeTable>().HasQueryFilter(x => !x.IsDeleted);
        modelBuilder.Entity<RegularizationTypeCodeTable>().HasQueryFilter(x => !x.IsDeleted);
        modelBuilder.Entity<EmployeeDetailEntity>().HasQueryFilter(x => !x.IsDeleted);

        modelBuilder
            .Entity<EmployeeDetailEntity>()
            .HasOne(x => x.ManagerRef)
            .WithMany()
            .OnDelete(DeleteBehavior.Restrict);

        modelBuilder
            .Entity<EmployeeDetailEntity>()
            .HasIndex(x => x.EmployeeId)
            .IsUnique();

        modelBuilder
           .Entity<EmployeeDetailEntity>()
           .HasIndex(x => x.DomainName);
    }

Answer 1

您需要为每个相关实体定义一个主键，例如：

public class ExitDetailEntity : Entity
{
    public int Id {get; set; } //primary key
    public int EmployeeDetailId {get; set; }
    public EmployeeDetailEntity EmployeeDetail {get; set; }
    public ExitStatusEnum ExitStatus {get; set;}
}

然后所有其他属性将不是唯一的。

您可以看到： https://docs.microsoft.com/en-us/ef/core/modeling/keys

迁移时外键变得唯一

1 个答案: