Data.DB.TParam.IsNull

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[–] Properties Type: property Visibility: public Source:

Data.DB.pas

Data.DB.hpp

Unit: Data.DB Parent: TParam

Delphi

property IsNull: Boolean read GetIsNull;

C++

__property bool IsNull = {read=GetIsNull, nodefault};

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

• Assign

• Bound

• Clear

Code Examples

• TParamsItems (Delphi)
• TParamsItems (C++)