System.Data.OleDb Namespace   OleDbParameter Class

Sets or retrieves a value of the parameter.

The property is read/write with no default value.

IDataParameter.Value

For input parameters, the value is bound to the OleDbCommand that is sent to the server. For output and return value parameters, the value is set on completion of the OleDbCommand and after the OleDbDataReader is closed.

When sending a null parameter value to the server, the user must specify DBNull, not null. The null value in the system is an empty object that has no value. DBNull is used to represent null values.

If the application specifies the database type, the bound value is converted to that type when the provider sends the data to the server. The provider attempts to convert any type of value if it supports the IConvertible interface. Conversion errors may result if the specified type is not compatible with the value.

Both the DbType and OleDbType properties can be inferred by setting this property.

The Value property is overwritten by Update.

The following example initializes an OleDbParameter and sets some of its properties.

public void CreateOleDbParameter ( ) {
   OleDbParameter myParam = new OleDbParameter ( "Specs", OleDbType.Decimal );
   myParam.Value = 3.1416;
   myParam.Precision = 8;
   myParam.Scale = 4;
}

Public Sub CreateOleDbParameter ( )
   Dim myParam As New OleDbParameter ( "Specs", OleDbType.Decimal )
   myParam.Value = 3.1416
   myParam.Precision = 8
   myParam.Scale = 4
End Sub

OleDbParameter Members