Symbian
Symbian OS Library

SYMBIAN OS V9.3

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Pre-evaluation window properties

The type of pre-evaluation window used has an impact on where and when changes to a table become visible in a rowset.


Basic properties

Pre-evaluation window type

No

Full

Partial

Memory usage

none

variable

fixed

Speed of navigation

variable

fast

fast

Programming

easy

easy

harder

Evaluation required

never

once after reset

on-going

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Updates through this rowset

The following table summarises where a row on this rowset appears, when it is updated, inserted or deleted.

Pre-evaluation window type

No

Full

Partial

UpdateL()

as per query

same position in set

same position in set

InsertL()

as per query

appended to the set

as per query, only after evaluation

DeleteL()

deleted

deleted

deleted

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Updates through another rowset

The following table summarises when a change to the underlying table affecting the rowset membership becomes visible in this rowset.

Pre-evaluation window type

No

Full

Partial

UpdateL()

on navigation

reset and evaluate

evaluate

InsertL()

on navigation

reset and evaluate

evaluate

DeleteL()

on navigation

GetL() attempted on row

GetL() attempted on row