RAD Studio VCL Reference
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TIBXSQLVAR.IsNull Property
TIBXSQLVAR Class | TIBXSQLVAR Members | IBSQL Namespace | Description
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Indicates whether the field has a value assigned to it.

Pascal
property IsNull: Boolean;
C++
__property Boolean IsNull;
Description

Use the IsNull property to determine if the field contains a value. If IsNull is true, the field is blank. If IsNull is false, the field has a value. 

 

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