使用sqlkata查询复杂对象

Question

我不能用查询来构建一个复杂的对象。我是怎么做的？

public class Person
{
    public long Id { get; set; }
    public string Name { get; set; }
    public Contact Contact { get; set; }
}

public class Contact
{
    public long Id { get; set; }
    public string FoneNumber { get; set; }
}

Answer 1

我的代码：

        var compiler = new SqlServerCompiler();
        var db = new QueryFactory(connection, compiler);

        var person = db.Query("Person")
                        .Select("Person.Id", "Person.Name", "Contact.Id", "Contact.FoneNumber")
                        .Join("Contact", "Person.Id", "Contact.PersonId")
                        .Where("Person.Id", 1)
                        .FirstOrDefault<Person>();

Answer 2

正如您之前所写的，使用Join方法连接"Contact“表，

var row = db.Query("Person")
            .Select(
                "Person.Id",
                "Person.Name",
                "Contact.Id as ContactId",
                "Contact.FoneNumber as FoneNumber"
            )
            .Join("Contact", "Person.Id", "Contact.PersonId")
            .Where("Person.Id", 1)
            .FirstOrDefault();

Answer 3

您可以使用Dapper的Multi-Mapping功能。

    [Test]
    public void Test_Multi_Mapping()
    {
        using (var conn = new SqlConnection(@"Data Source=.\sqlexpress; Integrated Security=true; Initial Catalog=test"))
        {
            var result = conn.Query<Person, Contact, Person>(
                "select Id = 1, Name = 'Jane Doe', Id = 2, FoneNumber = '800-123-4567'",
                (person, contact) => { person.Contact = contact;
                    return person;
                }).First();

            Assert.That(result.Contact.FoneNumber, Is.EqualTo("800-123-4567"));
        }
    }

您也可以使用".QueryMultiple“。请阅读Dapper的文档，或查看unit tests以获取更多示例。