ADODB.TParameterDirection Enumeration

TParameterDirection specifies the direction of a parameter.

Pascal

TParameterDirection = (
  pdUnknown,
  pdInput,
  pdOutput,
  pdInputOutput,
  pdReturnValue
);

C++

enum TParameterDirection {
  pdUnknown,
  pdInput,
  pdOutput,
  pdInputOutput,
  pdReturnValue
};

File

ADODB

Description

Use a TParameterDirection value to specify whether a parameter is an input parameter, an output parameter, both, or conveys a return value.

The constants that make up the TParameterDirection type correspond directly to the ADO ParameterDirectionEnum constants with similar names used for the Direction property of the ADO Parameter object. For instance, the constant pdInput corresponds to the ADO constant adParamInput. For additional information on these ADO constants and their effects, see the Microsoft Data Access SDK help in the topic for the Direction property of the ADO Parameter object.

TParameterDirection consists of the five constants summarized in the following table:

Parameter Direction	Meaning
pdUnknown	Parameter direction is unknown or cannot be determined.
pdInput	Parameter can only be used to convey data to a stored procedure or SQL statement.
pdOutput	Parameter can only be used to convey data from a stored procedure or SQL statement.
pdInputOutput	Parameter can be used to convey data to or from a stored procedure or SQL statement.
pdReturnValue	Parameter is used to convey a return value.