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When to use TSQLDataset and when to use TClientDataset ?

dbExpress

When to use TSQLDataset and when to use TClientDataset ?

by  towerbase  Posted    (Edited  )
TSQLDataset should be used for SQL statements which either do not return a result set or where the result set can be used in an unidirectional / read-only way.

It is more efficient to use TSQLDataset than to use TClientDataset when dealing with unidirectional / read-only result sets.

Note that it is possible to update a record using TSQLDataset with an SQL statement such as
Code: 
UPDATE customer SET credit=100 WHERE id=1234

TSQLDataset is very efficient when updating all the records in the table (especially when the table is on a remote computer)
Code: 
UPDATE customer SET credit=100


TClientDataset should be used if bi-directional support is required (for example to populate a TDBGrid), when the current record is to be updated or when a what-if type scenario is to be investigated.
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