In This Topic
Gets a value indicating whether the column contains non-existent or missing values.
Syntax
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'Declaration
Public Overloads Overrides Function IsDBNull( _
ByVal As Integer _
) As Boolean |
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public override bool IsDBNull(
int
) |
Parameters
- ordinal
Return Value
true if the specified column value is equivalent to
System.DBNull; otherwise,
false.
Example
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static void GetMyValue(PgSqlConnection myConnection)
{
PgSqlCommand cmd = new PgSqlCommand("SELECT * FROM Test.AllTypes");
cmd.Connection = myConnection;
myConnection.Open();
try
{
PgSqlDataReader reader = cmd.ExecuteReader();
reader.Read();
for (short i = 0; i < reader.FieldCount; i++)
{
if (reader.IsDBNull(i))
Console.WriteLine("NULL");
else
{
object someValue = reader.GetValue(i);
Console.WriteLine(someValue.ToString());
}
}
reader.Close();
}
finally
{
myConnection.Close();
}
} |
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Shared Sub GetMyValue(ByVal myConnection As PgSqlConnection)
Dim cmd As New PgSqlCommand("SELECT * FROM Test.AllTypes")
cmd.Connection = myConnection
myConnection.Open()
Try
Dim reader As PgSqlDataReader = cmd.ExecuteReader
reader.Read()
For i As Short = 0 To reader.FieldCount - 1
If reader.IsDBNull(i) Then
Console.WriteLine("NULL")
Else
Console.WriteLine(reader.GetValue(i).ToString)
End If
Next i
reader.Close()
Finally
myConnection.Close()
End Try
End Sub |
See Also
