Méthode ScriptBuffer.IsNull
Returns a value that indicates whether the value of the specified column is nullune référence Null (Nothing dans Visual Basic).
Espace de noms : Microsoft.SqlServer.Dts.Pipeline
Assembly : Microsoft.SqlServer.TxScript (en Microsoft.SqlServer.TxScript.dll)
Syntaxe
'Déclaration
Protected Function IsNull ( _
ColumnIndex As Integer _
) As Boolean
'Utilisation
Dim ColumnIndex As Integer
Dim returnValue As Boolean
returnValue = Me.IsNull(ColumnIndex)
protected bool IsNull(
int ColumnIndex
)
protected:
bool IsNull(
int ColumnIndex
)
member IsNull :
ColumnIndex:int -> bool
protected function IsNull(
ColumnIndex : int
) : boolean
Paramètres
- ColumnIndex
Type : System.Int32
The index of the column.
Valeur de retour
Type : System.Boolean
true if the value of the specified column is nullune référence Null (Nothing dans Visual Basic); otherwise, false.
Notes
The Script component developer does not use the ScriptBuffer class directly, but indirectly, through the derived classes in the BufferWrapper project item that represent the component's input and outputs.
The developer does not have to use the IsNull method, because the derived classes contain a <ColumnX>_IsNull property for each column.
Exemples
The following sample code from the autogenerated BufferWrapper project item demonstrates how the Script component uses the IsNull method.
Public Property [city_IsNull] As Boolean
Get
Return IsNull(1)
End Get
Set
SetNull(1)
End Set
End Property