我有两个表，JobRequest 和 WorkOrder。 JobRequest 的主键是一个名为 RequestNumber 的 varchar 字段。还有一个与工单表中的外键同名的字段。该字段上的表之间存在 0 到 1 的关系；当有机维护团队无法完成工作请求时，将为另一个维护团队发出工作订单。
数据库看起来有点像：
工作请求
ID BIGINT IDENTITY,
RequestNumber VARCHAR(15) NOT NULL,
...
工单
ID BIGINT IDENTITY,
WONumber VARCHAR(25) NOT NULL,
RequestNumber VARCHAR(15) NULL,
...
我已经构建了一个模型，构建了上下文和数据库表。我首先使用了手动代码，所以我没有任何模板或 SDL 文件。
我的模型看起来像：
[Table("JobRequest")]
public partial class JobRequest
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public JobRequest()
{
AuditLogs = new HashSet<AuditLog>();
AuthorizedUsers = new HashSet<AuthorizedUser>();
}
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public long? ID { get; set; }
[Key]
[StringLength(15)]
[DisplayName("Request Number")]
public string RequestNumber { get; set; }
[NotMapped]
public virtual WorkOrder WorkOrder { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<AuditLog> AuditLogs { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<AuthorizedUser> AuthorizedUsers { get; set; }
...
还有
[Table("WorkOrder")]
public partial class WorkOrder
{
public WorkOrder()
{
}
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public long? ID { get; set; }
[Key]
[StringLength(25)]
[DisplayName("Work Order Number")]
public string WONumber { get; set; }
[Key]
[Required]
[StringLength(15)]
[DisplayName("Request Number")]
public string RequestNumber { get; set; }
在上下文中我有这个：
...
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<JobRequest>()
.HasOptional(j => j.WorkOrder);
}
...
我可以轻松更新我的 JobRequest 表。当我根据作业请求创建工单时，收到错误无效的列名称“WorkOrders_RequestNumber”。
我到底做错了什么？ 我需要添加 CSDL 文件吗？
如果我这么做了，有人可以把它分解成GUMBY风格吗？我昨晚做了一个睡眠研究，结果我喝了糟糕的咖啡和肾上腺素。
编辑添加导航属性和 Fluent 定义。
编辑 2 - 我进行了 Ivan Stoev 建议的更改（https://chat.stackoverflow.com/rooms/138056/discussion- Between-russel-madere-and-ivan-stoev）。现在一切都已保存，但 RequestNumber 未保存在 WorkOrder 表中。这会在数据保存后破坏关系。我可以获得有关保留 RequestNumber 的建议吗？
编辑 3 - 查看 SQL Server Profiler，我看到以下插入语句。
exec sp_executesql N'INSERT [dbo].[WorkOrder]([WONumber], [Owner], [JobName], [SubContractNum],
[ContractAmount], [Fee], [Company], [Department],
[DisplayCompany], [StartDate], [CompletionDate],
[County], [Taxable], [PPBond], [Address], [City],
[State], [Zip], [Country], [RequestedBy],
[PurchAddress], [PurchCity], [PurchState], [PurchZip],
[PurchCounty], [PurchCountry], [DescriptionOfWork],
[EntryUser], [EntryDate], [LastChangedBy], [LastChanged],
[ContractType], [Revision], [PrintURL], [RequestNumber])
VALUES (@0, NULL, @1, @2, @3, @4, @5, @6, @7, @8, @9, @10, @11, @12, @13, @14, @15, @16,
@17, @18, @19, @20, @21, @22, @23, @24, @25, @26, @27, @28, @29, @30, @31, @32, @33,
@34, NULL)
SELECT [ID]
FROM [dbo].[WorkOrder]
WHERE @@ROWCOUNT > 0 AND [WONumber] = @0'...
我在语句中省略了架构和数据特定信息。
我在这里看到外键被作为 NULL 插入。如何设置外键的值？
以下设计代表提供的示例数据库架构：
型号：
[Table("JobRequest")]
public partial class JobRequest
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public long? ID { get; set; }
[Key]
[StringLength(15)]
[DisplayName("Request Number")]
public string RequestNumber { get; set; }
public virtual WorkOrder WorkOrder { get; set; }
}
[Table("WorkOrder")]
public partial class WorkOrder
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public long? ID { get; set; }
[Key]
[StringLength(25)]
[DisplayName("Work Order Number")]
public string WONumber { get; set; }
public virtual JobRequest JobRequest { get; set; }
}
配置：
modelBuilder.Entity<JobRequest>()
.HasOptional(e => e.WorkOrder)
.WithOptionalPrincipal(e => e.JobRequest)
.Map(m => m.MapKey("RequestNumber"));
一些操作：
var jobRequest = new JobRequest { RequestNumber = "RN1" };
db.JobRequests.Add(jobRequest);
db.SaveChanges();
var workOrder = new WorkOrder { WONumber = "WON1" };
db.WorkOrders.Add(workOrder);
db.SaveChanges();
var workOrder = new WorkOrder { WONumber = "WON2" };
var jobRequest = new JobRequest { RequestNumber = "RN2" };
workOrder.JobRequest = jobRequest;
db.WorkOrders.Add(workOrder);
db.SaveChanges();
或者另一种选择
var workOrder = new WorkOrder { WONumber = "WON3" };
var jobRequest = new JobRequest { RequestNumber = "RN3" };
jobRequest.WorkOrder = workOrder;
db.JobRequests.Add(jobRequest);
db.SaveChanges();
var workOrder = db.WorkOrders.Include(e => e.JobRequest).First(e => e.WONumber == "WON1");
var jobRequest = db.JobRequests.Include(e => e.WorkOrder).First(e => e.RequestNumber == "RN1");
workOrder.JobRequest = jobRequest;
db.SaveChanges();
或者另一种选择
var workOrder = db.WorkOrders.Include(e => e.JobRequest).First(e => e.WONumber == "WON1");
var jobRequest = db.JobRequests.Include(e => e.WorkOrder).First(e => e.RequestNumber == "RN1");
jobRequest.WorkOrder = workOrder;
db.SaveChanges();
var jobRequest = db.JobRequests.Include(e => e.WorkOrder).First(e => e.RequestNumber == "RN2");
jobRequest.WorkOrder = null;
db.SaveChanges();
or alternatively
var workOrder = db.WorkOrders.Include(e => e.JobRequest).First(e => e.WONumber == "WON3");
workOrder.JobRequest = null;
db.SaveChanges();
所有这些操作都按预期工作，并通过导航属性间接管理/保留隐藏（阴影）
WorkOrder.RequestNumber请注意，对断开连接的实体的操作需要特殊处理。如果您在正确实施断开连接的实体修改时遇到问题，您可以创建另一个帖子并提供具体详细信息。
如果您遇到 EF 中的
NavigationPropertyableNavigationPropertyTable.NavigationPreperty