NoForeignKeyAttribute Class

Disables automatic creation of the FOREIGN KEY constraints.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v19.1.dll

Declaration

C#

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, Inherited = true)]
public sealed class NoForeignKeyAttribute :
    Attribute

VB.NET

<AttributeUsage(AttributeTargets.Property Or AttributeTargets.Field, Inherited:=True)>
Public NotInheritable Class NoForeignKeyAttribute
    Inherits Attribute

C#

[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, Inherited = true)]
public sealed class NoForeignKeyAttribute :
    Attribute

VB.NET

<AttributeUsage(AttributeTargets.Field Or AttributeTargets.Property, Inherited:=True)>
Public NotInheritable Class NoForeignKeyAttribute
    Inherits Attribute

Remarks

The following code demonstrates how to use the NoForeignKeyAttribute:

C#

public class Person : XPObject
{
    // ...
    [Association("Person-Orders")]
    public XPCollection<Order> Orders {
        get { return GetCollection<Order>("Orders"); }
    }
}

public class Order : XPObject {
    // ...
    [Association("Person-Orders"), NoForeignKey]
    public Person PersonID;
}

VB.NET

Class Person
   Inherits XPObject
   ' ...
   <Association("Person-Orders")>  _
   Public ReadOnly Property Orders() As XPCollection(Of Order)
      Get
         Return GetCollection(Of Order)("Orders")
      End Get
   End Property
End Class

Class Order
   Inherits XPObject
   ' ...
   <Association("Person-Orders"), NoForeignKey()> 
   Public Person As PersonID
End Class

Note

Foreign keys preserve referential integrity in a relational database. A lack of referential integrity in a database can lead to errors or returning incomplete data without indication of an error. To enforce the data integrity at the database level, do not disable automatic creation of the FOREIGN KEY constraints (or always add them manually).

Inheritance

Object

Attribute

NoForeignKeyAttribute