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Object Pascal

property IsNull: Boolean read GetIsNull;


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


Type Visibility Source Unit Parent
property public
Data.DB TParam


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