Data.DB.TParam.IsNull
Delphi
property IsNull: Boolean read GetIsNull;
C++
__property bool IsNull = {read=GetIsNull, nodefault};
Properties
Type | Visibility | Source | Unit | Parent |
---|---|---|---|---|
property | public | Data.DB.pas Data.DB.hpp |
Data.DB | TParam |
Description
Indicates whether the value assigned to the parameter is NULL (blank).
Inspect IsNull to discover if the value of the parameter is NULL, indicating the value of a blank field. NULL values can arise in the following ways:
Assigning the value of another, NULL, parameter.
Assigning the value of a blank field.
Calling the Clear method.
Note: NULL parameters are not the same as unbound parameters. Unbound parameters have not had a value assigned. NULL parameters have a NULL value. NULL parameters may be bound or unbound.
See Also
Code Examples