Data.DB.TParam.Bound
| [–] Properties | |
|---|---|
| Type: property | |
| Visibility: public | |
| Source: Data.DB.pas Data.DB.hpp
| |
| Unit: Data.DB | |
| Parent: TParam | |
Delphi
property Bound: Boolean read FBound write FBound;
C++
__property bool Bound = {read=FBound, write=FBound, nodefault};
Description
Indicates whether a value (NULL or otherwise) has been assigned to the parameter.
Read Bound to determine whether a value has been assigned to the parameter. Whenever a value is assigned to the TParam object, Bound is automatically set to true. Set Bound to false to undo the setting of a value. The Clear method replaces the value of the parameter with NULL, but does not set Bound to false. However, if the Clear method is used to bind the parameter to a NULL value, Bound must be separately set to true.
Datasets that represent queries and stored procedures use the value of Bound to determine whether to assign a default value for the parameter. If Bound is false, datasets that represent queries attempt to assign a value from the dataset indicated by their DataSource property. Similarly, when Bound is false, datasets that represent stored procedures attempt to supply a value directly from the server.