IBCustomDataSet

Assign an instance of TIBGeneratorField as the value of a dataset's GeneratorField property to indicate that the value of a specified field in the dataset can be generated by the server. 

Use the Field property to specify the field whose value is generated by the TIBGeneratorField object. Use the Generator and IncrementBy properties to specify how the server should generate field values. Use the ApplyEvent property to indicate when the TIBGeneratorField should call the server to generate field values.