RAD Studio VCL Reference
TDataSet.IsUniDirectional Property

Indicates whether the dataset is unidirectional.

property IsUniDirectional: Boolean;
__property Boolean IsUniDirectional;

IsUniDirectional indicates whether the dataset is a descendant of TCustomSQLDataSet. Unidirectional datasets raise exceptions on all navigation methods except for First and Next. They do not support filters, bookmarks, lookup fields, or any other features that require an internal record buffer. You can't use a unidirectional dataset as the source to a data-aware grid. 


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