Opens the dataset.
Call Open to set the Active property for the dataset to True. When Active
is True, data can be read from and written to the database.
Setting Active to True:
- Triggers the BeforeOpen event handler if one is defined for the dataset.
- Sets the dataset state to dsBrowse.
- Opens cursor into the dataset, if appropriate (only applies to TPSQLDataset and its
descendants, TPSQLQuery and TPSQLTable).
- Triggers the AfterOpen event handler if one is defined for the dataset.
If an error occurs during the dataset open, dataset state is set to dsInactive, and the
cursor is closed.