Question

我有2个表，父表保存历史表的定义字段。我试图在历史记录表中引用def表的外键，但是当我运行此代码时，被引用的对象始终为null。

我做错了什么？

[Alias("DOCMGR_PublishHistories")]
public class PublishHistory
{
    [AutoIncrement]
    [PrimaryKey]
    public virtual int Id { get; set; }

    public int DocumentDefinitionId { get; set; }

    [Reference]
    public DocumentDefinition DocumentDefinition { get; set; }

    [Required]
    public DateTimeOffset RequestedAt { get; set; }

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

    [Required]
    public DateTimeOffset EffectiveDate { get; set; }
}

[Alias("DOCMGR_DocumentDefinitions")]
public class DocumentDefinition
{
    [AutoIncrement]
    [PrimaryKey]
    public virtual int Id { get; set; }

    [System.ComponentModel.DataAnnotations.StringLength(50)]
    [System.ComponentModel.DataAnnotations.Required]
    public virtual string LegalDocType { get; set; }

    [System.ComponentModel.DataAnnotations.Required]
    [System.ComponentModel.DataAnnotations.StringLength(50)]
    public virtual string LegalDocSubType { get; set; }

    [System.ComponentModel.DataAnnotations.Required]
    [System.ComponentModel.DataAnnotations.StringLength(256)]
    public virtual string DisplayTitle{ get; set; }

    [System.ComponentModel.DataAnnotations.StringLength(50)]
    public virtual string EntityName{ get; set; }

    [System.ComponentModel.DataAnnotations.StringLength(256)]
    public virtual string EntityUrl{ get; set; }

    [System.ComponentModel.DataAnnotations.Required]
    public virtual bool IsActive { get; set; }
}

Answer 1

我添加了一个Live Example of this on Gistlyn来显示此工作正常：

您可以将PublishHistory表及其DocumentDefinition引用保存为：

db.CreateTable<DocumentDefinition>();
db.CreateTable<PublishHistory>();

db.Save(new PublishHistory {
    RequestedBy = "RequestedBy",
    RequestedAt = DateTime.UtcNow,
    EffectiveDate = DateTimeOffset.UtcNow,
    DocumentDefinition = new DocumentDefinition {
        LegalDocType = "LegalDocType",
        LegalDocSubType = "LegalDocSubType",
        DisplayTitle = "DisplayTitle",
        EntityName = "EntityName",
        EntityUrl = "EntityUrl",
        IsActive = true,
    }
}, references: true);

然后使用Load* APIs to load references，例如：

var row = db.LoadSingleById<PublishHistory>(1);
row.PrintDump();

哪个输出PublishHistory表及其填充的DocumentDefinition子引用：

{
    Id: 1,
    DocumentDefinitionId: 1,
    DocumentDefinition: 
    {
        Id: 1,
        LegalDocType: LegalDocType,
        LegalDocSubType: LegalDocSubType,
        DisplayTitle: DisplayTitle,
        EntityName: EntityName,
        EntityUrl: EntityUrl,
        IsActive: True
    },
    RequestedAt: 2019-05-07T20:08:29.1437953+00:00,
    RequestedBy: RequestedBy,
    EffectiveDate: 2019-05-07T20:08:29.1437953+00:00
}

ORMLite中的ServiceStack如何对父表进行简单引用？

1 个答案: