Question

我想使用dapper从数据库中查询复杂的实体。

实施例。 Job是我想要查询的顶级实体。

public class Job
{
    public User User { get; set; }
}
public class Account
{
}

public class Roles
{
    public IList<Schedule> Schedules { get; set; }
}


public class Devices
{
    public IList<Roles> Roles { get; set; }
    public IList<Account> Accounts { get; set; }
}

public class Schedule
{

}
public class User
{
    public IList<Account> Accounts { get; set; }
    public Profile Profile { get; set; }
}
public class Profile
{
    public IList<Account> Accounts { get; set; }
}

这是否可能与小巧玲珑，如果它是值得使用dapper为此或我应该使用其他ORM（EF，LLBLGen，NH）？

Answer 1

我相信你问的是如何在Dapper中实现MultiMapping。

您可以传递多个模型：

var sql = @"select * from Product p 
            inner join Customer c on p.CustomerId = c.CustomerId 
            order by p.ProductName";

var item = connection.Query<ProductItem, Customer, ProductItem>(sql,
        (p, c) => { p.Customer = c; return p; }, splitOn: "CustomerId").First();

参考：Correct use of Multimapping in Dapper

Dapper Multimapping复杂实体

1 个答案: