How would it work in Subsonic's SimpleReporitory if I wanted to be able to have a 1 to many relationship between objects?
Would I have to create a bridge object and then build my parent object at runtime, or is this support built in?
What I am looking for is the folowing:
Adam's Example Shop...
Public Class Shop Private m_id As Integer Private m_Name As String Private m_Employees As List(Of Employee) Public Property Id() As Integer Get Return m_id End Get Set(ByVal value As Integer) m_id = value End Set End Property Public Property Name() As String Get Return m_Name End Get Set(ByVal value As String) m_Name = value End Set End Property Public Property Employees() As List(Of Employee) Get Return m_Employees End Get Set(ByVal value As List(Of Employee)) m_Employees = value End Set End Property End Class Public Class Employee Private m_id As Integer Private m_Name As String Public Property Id() As Integer Get Return m_id End Get Set(ByVal value As Integer) m_id = value End Set End Property Public Property Name() As String Get Return m_Name End Get Set(ByVal value As String) m_Name = value End Set End Property End Class
Main bits:
Dim repo As New SimpleRepository("SubSonicObjectTest", SimpleRepositoryOptions.RunMigrations) Dim emplyee1 As New Employee emplyee1.Name = "Martin" Dim emplyee2 As New Employee emplyee2.Name = "Adam" Dim shop As New Shop shop.Name = "Sub Sonic Store" shop.Employees = New List(Of Employee) shop.Employees.Add(emplyee1) shop.Employees.Add(emplyee2) repo.Add(Of Shop)(shop)
I think this should create 3 tables:
Shops
Employees
ShopsToEmployees (or some other naming convention)
But I only get a Channels table!
I'm updating the SimpleRepo stuff currently to automatically create joined tables based on collections. Not easy to determine many/many vs 1/many - but I have some ideas :).
To create a one to many relationship you just have to create the object model, SubSonic should do the rest for you e.g.
public class Shop
{
public int Id { get; set; }
public String Name { get; set; }
public List<Employee> Employees { get; set; }
}
public class Employee
{
public int Id { get; set; }
public String Name { get; set; }
}
EDIT: This should generate two tables when you run a migration not 3. The 3 three tables you describe in your question would represent a many to many relationship. Also in your example you're not saving your Employees, SubSonic does not cascade saves so you'll need to save your Shop then add the Employees to it and BatchSave the Employees.
来源:https://stackoverflow.com/questions/1378292/parent-and-child-object-in-simplerepository