foreign-keys - dapper 在 classmapper 中一对一映射

Question

我有 2 个简单的表。

create table Owner
(
    Id int primary key,
    Name nvarchar(100),
);

create table Status
(
    Id int primary key,
    BrandName nvarchar(50)
    OwnerId int foreign key references Owner(Id),
);

在应用程序中，我将这些表映射到模型类:

public class Owner
{
    public int Id {get;set;}
    public string Name{get;set;}
    public Status Status {get;set;}
}


public class Status
{
    public int Id {get;set;}
    public string Brand {get;set;}
    public int OwnerId {get;set;}
}

我使用 dapper 和 dapper 扩展。

我想在 classmapper 中的 dapper 中一对一地映射关系。这是可能的？

我的目标是当我添加所有者对象时，该对象还通过存储库将属性状态设置为 db
它还插入记录做状态表。

实现这种行为的最佳方法是什么？

public class OwnerMapper : ClassMapper<Owner>
{
    public OwnerMapper()
    {
        Table("Owner");
        Map(p=>p.Id).Column("Id").Key(KeyType.Assigned);
        Map(p=>p.Name).Column("Name");
        //how map property status

    }
}


public class StatusMapper : ClassMapper<Status>
{
    public StatusMapper()
    {
        Table("Status");
        Map(p=>p.Id).Column("Id").Key(KeyType.Identity);
        Map(p=>p.Brand).Column("BrandName");
        Map(p=>OwnerId).Column("OwnerId");

    }
}

Answer 1

你可以试试Dapper的multi-mapping特征:

[Test]
public void MyTest()
{
    var connection = new SqlConnection("conn string here");
    connection.Open();

    const string sql = 
        "select Id = 1, Name ='Bill Gates', Id = 1, Brand = 'Apple', OwnerId = 1";
    var result = connection.Query<Owner, Status, Owner>(sql,
                                           (owner, status) =>
                                               {
                                                   owner.Status = status;
                                                   return owner;
                                               },
                                           commandType: CommandType.Text
        ).FirstOrDefault();
    Assert.That(result, Is.Not.Null);
    Assert.That(result.Status, Is.Not.Null);
    Assert.That(result.Status.Brand, Is.EqualTo("Apple"));
    connection.Close();
}