Classe ForeignKey

The ForeignKey object represents a SQL Server foreign key.

Gerarchia di ereditarietà

System.Object
  Microsoft.SqlServer.Management.Smo.SmoObjectBase
    Microsoft.SqlServer.Management.Smo.SqlSmoObject
      Microsoft.SqlServer.Management.Smo.NamedSmoObject
        Microsoft.SqlServer.Management.Smo.ScriptNameObjectBase
          Microsoft.SqlServer.Management.Smo.ForeignKey

Spazio dei nomi  Microsoft.SqlServer.Management.Smo
Assembly:  Microsoft.SqlServer.Smo (in Microsoft.SqlServer.Smo.dll)

Sintassi

'Dichiarazione
Public NotInheritable Class ForeignKey _
    Inherits ScriptNameObjectBase _
    Implements ICreatable, IDroppable, IMarkForDrop, IAlterable,  _
    IRenamable, IExtendedProperties, IScriptable, ISfcSupportsDesignMode
'Utilizzo
Dim instance As ForeignKey

public sealed class ForeignKey : ScriptNameObjectBase, 
    ICreatable, IDroppable, IMarkForDrop, IAlterable, IRenamable, 
    IExtendedProperties, IScriptable, ISfcSupportsDesignMode

public ref class ForeignKey sealed : public ScriptNameObjectBase, 
    ICreatable, IDroppable, IMarkForDrop, IAlterable, IRenamable, 
    IExtendedProperties, IScriptable, ISfcSupportsDesignMode

[<SealedAttribute>]
type ForeignKey =  
    class 
        inherit ScriptNameObjectBase 
        interface ICreatable 
        interface IDroppable 
        interface IMarkForDrop 
        interface IAlterable 
        interface IRenamable 
        interface IExtendedProperties 
        interface IScriptable 
        interface ISfcSupportsDesignMode 
    end

public final class ForeignKey extends ScriptNameObjectBase implements ICreatable, IDroppable, IMarkForDrop, IAlterable, IRenamable, IExtendedProperties, IScriptable, ISfcSupportsDesignMode

Nel tipo ForeignKey sono esposti i membri seguenti.

Costruttori

	Nome	Descrizione
	ForeignKey()	Initializes a new instance of the ForeignKey class.
	ForeignKey(Table, String)	Initializes a new instance of the ForeignKey class on the specified table with the specified name.

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Proprietà

	Nome	Descrizione
	Columns	Represents a collection of Column objects. Each Column object represents a column included in the foreign key.
	CreateDate	Gets the date and time when the foreign key was created.
	DateLastModified	Gets the date and time when the foreign key was last modified.
	DeleteAction	Gets or sets the action taken when the row that is referenced by the foreign key is deleted.
	ExtendedProperties	Represents a collection of ExtendedProperty objects. Each ExtendedProperty object represents an extended property on the ForeignKey object.
	ID	Gets the ID value that uniquely identifies the foreign key.
	IsChecked	Gets or sets the Boolean property value that specifies whether the foreign key constraint was enabled without checking existing rows.
	IsEnabled	Gets or sets the Boolean property value that specifies whether the foreign key is enabled.
	IsFileTableDefined	Gets or sets whether the file table is defined.
	IsSystemNamed	Gets the Boolean property value that specifies whether the foreign key is named by the system or by the user.
	Name	Gets or sets the name of the foreign key. Esegue l'override di NamedSmoObject.Name.
	NotForReplication	Gets the Boolean property value that specifies whether the foreign key is available for replication.
	Parent	Gets or sets the Table object that is the parent of the ForeignKey object.
	Properties	Gets a collection of Property objects that represent the object properties. Ereditato da SqlSmoObject.
	ReferencedKey	Gets the primary key referenced by the foreign key.
	ReferencedTable	Gets or sets the table that contains the primary key referenced by the foreign key.
	ReferencedTableSchema	Gets or sets the table schema that contains the primary key referenced by the foreign key.
	ScriptReferencedTable	Gets or sets the Boolean value that specifies whether to script the table referenced by the foreign key.
	ScriptReferencedTableSchema	Gets or sets the Boolean value that specifies whether to script the schema of the table referenced by the foreign key.
	State	Gets the state of the referenced object. Ereditato da SmoObjectBase.
	UpdateAction	Gets or sets the Boolean property value that specifies whether the foreign key supports cascading updates.
	Urn	Gets the Uniform Resource Name (URN) address value that uniquely identifies the object. Ereditato da SqlSmoObject.
	UserData	Gets or sets user-defined data associated with the referenced object. Ereditato da SmoObjectBase.

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Metodi

	Nome	Descrizione
	Alter	Updates any ForeignKey object property changes on instance of SQL Server.
	Create	Creates a foreign key on the instance of SQL Server as defined by the ForeignKey object.
	Discover	Discovers a list of type Object. Ereditato da SqlSmoObject.
	Drop	Drops the foreign key.
	Equals	Ereditato da Object.
	FormatSqlVariant	Formats an object as SqlVariant type. Ereditato da SqlSmoObject.
	GetContextDB	Gets the context database that is associated with this object. Ereditato da SqlSmoObject.
	GetDBName	Gets the database name that is associated with the object. Ereditato da SqlSmoObject.
	GetHashCode	Ereditato da Object.
	GetPropValue	Gets a property value of the SqlSmoObject object. Ereditato da SqlSmoObject.
	GetPropValueOptional	Gets a property value of the SqlSmoObject object. Ereditato da SqlSmoObject.
	GetPropValueOptionalAllowNull	Gets a property value of the SqlSmoObject object. Ereditato da SqlSmoObject.
	GetServerObject	Gets the server of the SqlSmoObject object. Ereditato da SqlSmoObject.
	GetType	Ereditato da Object.
	Initialize()	Initializes the object and forces the properties be loaded. Ereditato da SqlSmoObject.
	Initialize(Boolean)	Initializes the object and forces the properties be loaded. Ereditato da SqlSmoObject.
	IsObjectInitialized	Verifies whether the object has been initialized. Ereditato da SqlSmoObject.
	IsObjectInSpace	Verifies whether the object is isolated or connected to the instance of SQL Server. Ereditato da SqlSmoObject.
	MarkForDrop	Marks the foreign key to be dropped the next time its parent Table object is altered by the Alter method.
	Refresh	Refreshes the script name. Ereditato da ScriptNameObjectBase.
	Rename	Renames the foreign key to the specified new name.
	Script()	Generates a Transact-SQL script that can be used to re-create the foreign key.
	Script(ScriptingOptions)	Generates a Transact-SQL script that can be used to re-create the foreign key as specified by the script options.
	SetParentImpl	Sets the parent of the SqlSmoObject to the newParent parameter. Ereditato da SqlSmoObject.
	ToString	Returns a String that represents the referenced object. Ereditato da SqlSmoObject.
	Validate	Validates the state of an object. Ereditato da SmoObjectBase.

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Eventi

	Nome	Descrizione
	PropertyChanged	Represents the event that occurs when a property is changed. Ereditato da SqlSmoObject.
	PropertyMetadataChanged	Represents the event that occurs when property metadata changes. Ereditato da SqlSmoObject.

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Implementazioni esplicite dell'interfaccia

	Nome	Descrizione
	IAlienObject.Discover	Discovers any dependencies. Non fare riferimento direttamente a questo membro nel codice. Supporta l'infrastruttura di SQL Server. Ereditato da SqlSmoObject.
	IAlienObject.GetDomainRoot	Returns the root of the domain. Ereditato da SqlSmoObject.
	IAlienObject.GetParent	Gets the parent of this object. Non fare riferimento direttamente a questo membro nel codice. Supporta l'infrastruttura di SQL Server. Ereditato da SqlSmoObject.
	IAlienObject.GetPropertyType	Gets the type of the specified property. Ereditato da SqlSmoObject.
	IAlienObject.GetPropertyValue	Gets the value of the specified property. Ereditato da SqlSmoObject.
	IAlienObject.GetUrn	Gets the Unified Resource Name (URN) of the object. Non fare riferimento direttamente a questo membro nel codice. Supporta l'infrastruttura di SQL Server. Ereditato da SqlSmoObject.
	IAlienObject.Resolve	Gets the instance that contains the information about the object from the Unified Resource Name (URN) of the object. Ereditato da SqlSmoObject.
	IAlienObject.SetObjectState	Sets the object state to the specified SfcObjectState value. Ereditato da SqlSmoObject.
	IAlienObject.SetPropertyValue	Sets the property value. Ereditato da SqlSmoObject.
	ISfcPropertyProvider.GetPropertySet	Gets the interface reference to the set of properties of this object. Ereditato da SqlSmoObject.
	ISfcSupportsDesignMode.IsDesignMode	Gets a Boolean value that indicates whether the object supports design mode. Identificato solo a scopo informativo. Non supportato. Non è garantita la compatibilità con le versioni future.

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Osservazioni

To get ForeignKey object properties, users can be a member of the public fixed server role.

To set ForeignKey object properties, users must have ALTER permission on the parent table or be a member of the db_owner fixed database role.

To create or drop a foreign key, users must have ALTER permission on the parent table or be a member of the db_owner fixed database role.

Thread Safety

Tutti i membri statici pubblici (Shared in Microsoft Visual Basic) di questo tipo sono sicuri per le operazioni a thread multipli. Non è invece garantita la sicurezza dei membri dell'istanza.

Esempi

Creazione, modifica e rimozione di chiavi esterne

Protezione dei thread

I membri static (Shared in Visual Basic) pubblici di questo tipo sono affidabili. Non è invece garantita la sicurezza dei membri dell'istanza.

Vedere anche

Riferimento

Spazio dei nomi Microsoft.SqlServer.Management.Smo

Altre risorse

Creazione, modifica e rimozione di chiavi esterne

CREATE TABLE (Transact-SQL)