Proprietà SupportsNullColumns
Returns a Boolean that indicates if the table supports nullNothingnullptrunitriferimento Null (Nothing in Visual Basic). columns. This field is read-only.
Spazio dei nomi Microsoft.SqlServer.Dts.Runtime
Assembly: Microsoft.SqlServer.ManagedDTS (in Microsoft.SqlServer.ManagedDTS.dll)
Sintassi
'Dichiarazione
Public ReadOnly Property SupportsNullColumns As Boolean
Get
'Utilizzo
Dim instance As DBProviderInfo
Dim value As Boolean
value = instance.SupportsNullColumns
public bool SupportsNullColumns { get; }
public:
property bool SupportsNullColumns {
bool get ();
}
member SupportsNullColumns : bool
function get SupportsNullColumns () : boolean
Valore proprietà
Tipo: System. . :: . .Boolean
A Boolean that indicates if the table supports nullNothingnullptrunitriferimento Null (Nothing in Visual Basic). columns. A value of true indicates that nullNothingnullptrunitriferimento Null (Nothing in Visual Basic). columns are supported.
Esempi
The following example enumerates the properties of the database providers available on the computer.
namespace dbproviderinfo
{
class Program
{
static void Main(string[] args)
{
Application app = new Application();
DBProviderInfos dbis = app.DBProviderInfos;
foreach (DBProviderInfo dbi in dbis)
{
Console.WriteLine("Description = {0}, Name = {1}, ParseName = {2}", dbi.Description, dbi.Name, dbi.ParseName);
Console.WriteLine("ProviderSubType ={0}, ProviderType = {1}", dbi.ProviderSubType, dbi.ProviderType);
Console.WriteLine("SupportsNullColumns = {0}, UseFullTableName = {1}", dbi.SupportsNullColumns, dbi.UseFullTableName);
}
}
}
}
Namespace dbproviderinfo
Class Program
Shared Sub Main(ByVal args() As String)
Dim app As Application = New Application()
Dim dbis As DBProviderInfos = app.DBProviderInfos
Dim dbi As DBProviderInfo
For Each dbi In dbis
Console.WriteLine("Description = {0}, Name = {1}, ParseName = {2}", dbi.Description, dbi.Name, dbi.ParseName)
Console.WriteLine("ProviderSubType ={0}, ProviderType = {1}", dbi.ProviderSubType, dbi.ProviderType)
Console.WriteLine("SupportsNullColumns = {0}, UseFullTableName = {1}", dbi.SupportsNullColumns, dbi.UseFullTableName)
Next
End Sub
End Class
End Namespace
Sample output:
Description = MediaCatalogDB OLE DB Provider, Name = MediaCatalogDB OLE DB Provider, ParseName = {09E767A6-4481-4791-86A5-A739E5290E4C}
ProviderSubType =None, ProviderType = OleDb
SupportsNullColumns = True, UseFullTableName = True
Description = Microsoft OLE DB Provider for SQL Server, Name = SQLOLEDB, ParseName = {0C7FF16C-38E3-11d0-97AB-00C04FC2AD98}
ProviderSubType =SqlServer, ProviderType = OleDb
SupportsNullColumns = True, UseFullTableName = True