Class: TMMUpdater
property PrefetchComplete : Boolean; { read-only }
property PrefetchRowsLoaded : Integer; { read-only }
property PrefetchError : TAppError; { read-only }State properties for the result of the last Prefetch
call, if any.
Prefetch is optional; these properties have safe default
values when it is never called.
| Property | Meaning |
|---|---|
PrefetchComplete |
True when Prefetch succeeded (including
empty result). False when Prefetch was called
and failed. True by default (before Prefetch
is called) so Execute is not blocked when
Prefetch is not used. |
PrefetchRowsLoaded |
Row count loaded into the buffer. 0 when
Prefetch failed, returned an empty result, or was never
called. |
PrefetchError |
Structured error from the last Prefetch call.
Code = EC_NONE on success or when Prefetch was
never called. Use PrefetchError.Msg for the failure
description. See TAppError. |
Execute only refuses to run when
PrefetchComplete = False, which happens exclusively when
Prefetch was called and failed. If Prefetch
was never called, PrefetchComplete is True and
Execute is not affected. To recover from a failed
Prefetch, call it again.