Data.Win.ADODB.TParameterDirection
Delphi
TParameterDirection = (pdUnknown, pdInput, pdOutput, pdInputOutput,
pdReturnValue);
C++
enum DECLSPEC_DENUM TParameterDirection : unsigned char { pdUnknown, pdInput, pdOutput, pdInputOutput, pdReturnValue };
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| enum | public | Data.Win.ADODB.pas Data.Win.ADODB.hpp |
Data.Win.ADODB | Data.Win.ADODB |
Description
TParameterDirection specifies the direction of a parameter.
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. |