Api.RetrieveColumnAsDouble method (JET_SESID, JET_TABLEID, JET_COLUMNID)

Retrieves a double column value from the current record. The record is that record associated with the index entry at the current position of the cursor.

Namespace:  Microsoft.Isam.Esent.Interop
Assembly:  Microsoft.Isam.Esent.Interop (in Microsoft.Isam.Esent.Interop.dll)

Syntax

'Declaration
Public Shared Function RetrieveColumnAsDouble ( _
    sesid As JET_SESID, _
    tableid As JET_TABLEID, _
    columnid As JET_COLUMNID _
) As Nullable(Of Double)
'Usage
Dim sesid As JET_SESID
Dim tableid As JET_TABLEID
Dim columnid As JET_COLUMNID
Dim returnValue As Nullable(Of Double)

returnValue = Api.RetrieveColumnAsDouble(sesid, _
    tableid, columnid)

public static Nullable<double> RetrieveColumnAsDouble(
    JET_SESID sesid,
    JET_TABLEID tableid,
    JET_COLUMNID columnid
)

Parameters

• sesid
  Type: Microsoft.Isam.Esent.Interop.JET_SESID

  The session to use.

• tableid
  Type: Microsoft.Isam.Esent.Interop.JET_TABLEID

  The cursor to retrieve the column from.

• columnid
  Type: Microsoft.Isam.Esent.Interop.JET_COLUMNID

  The columnid to retrieve.

Return value

Type: System.Nullable<Double>
The data retrieved from the column as a double. Null if the column is null.

See also

Reference

Api class

Api members

RetrieveColumnAsDouble overload

Microsoft.Isam.Esent.Interop namespace