Zarif basit haritalama

Question

Tablo:

create table Documents 
    (Id int, 
    SomeText varchar(100), 
    CustomerId int, 
    CustomerName varchar(100) 
    ) 

insert into Documents (Id, SomeText, CustomerId, CustomerName) 
    select 1, '1', 1, 'Name1' 
    union all 
    select 2, '2', 2, 'Name2' 

Sınıflar:

public class Document 
{ 
    public int Id { get; set; } 
    public string SomeText { get; set; } 
    public Customer { get; set; } 
} 

public class Customer 
{ 
    public int Id { get; set; } 
    public string Name { get; set; } 
} 

nasıl alabilirim Dapper ile Customers tüm Documents? Bu bana tüm belgeleri verir, ama müşteri (tabii ki) null:

connection.Query<Document>("select Id, SomeText, CustomerId, CustomerName from Documents")... 

DÜZENLEME - benzer ancak daha gelişmiş haritalama soru: (Çok Haritalama bölümüne bakınız) dapper project page alınan Dapper intermediate mapping

Answer 1

Örnek:

var sql = 
@"select * from #Posts p 
left join #Users u on u.Id = p.OwnerId 
Order by p.Id"; 

var data = connection.Query<Post, User, Post>(sql, (post, user) => { post.Owner = user; return post;}); 
var post = data.First(); 

post.Content.IsEqualTo("Sams Post1"); 
post.Id.IsEqualTo(1); 
post.Owner.Name.IsEqualTo("Sam"); 
post.Owner.Id.IsEqualTo(99); 

Answer 2

var docs = connection.Query<Document, Customer, Document>(
    "select Id, SomeText, CustomerId as [Id], CustomerName as [Name] from Documents", 
    (doc, cust) => { doc.Customer = cust; return doc; }).ToList();