Digikam::CoreDbOperationGroup Class Reference

Public Member Functions
void	allowLift ()
	CoreDbOperationGroup ()
	CoreDbOperationGroup (CoreDbAccess *const access)
void	lift ()
void	resetTime ()
void	setMaximumTime (int msecs)
	~CoreDbOperationGroup ()

Detailed Description

When you intend to execute a number of write operations to the database, group them while holding a CoreDbOperationGroup. For some database systems (SQLite), keeping a transaction across write operations occurring in short time results in enormous speedup (800x). For system that do not need this optimization, this class is a no-op.

Constructor & Destructor Documentation

CoreDbOperationGroup() [1/2]

Digikam::CoreDbOperationGroup::CoreDbOperationGroup

(

)

Retrieve a CoreDbAccess object each time when constructing and destructing.

CoreDbOperationGroup() [2/2]

Digikam::CoreDbOperationGroup::CoreDbOperationGroup ( CoreDbAccess *const  access )

explicit

Use an existing CoreDbAccess object, which must live as long as this object exists.

~CoreDbOperationGroup()

Digikam::CoreDbOperationGroup::~CoreDbOperationGroup

(

)

Member Function Documentation

allowLift()

void Digikam::CoreDbOperationGroup::allowLift

(

)

Allows to lift(). The transaction will be lifted if the time set by setMaximumTime() has expired.

References lift().

Referenced by Digikam::FileActionMngrDatabaseWorker::applyMetadata(), Digikam::FileActionMngrDatabaseWorker::assignColorLabel(), Digikam::FileActionMngrDatabaseWorker::assignPickLabel(), Digikam::FileActionMngrDatabaseWorker::assignRating(), Digikam::DigikamItemView::dragDropSort(), Digikam::FileActionMngrDatabaseWorker::editGroup(), Digikam::AlbumManager::mergeTAlbum(), and Digikam::FaceTagsEditor::removeNormalTags().

lift()

void Digikam::CoreDbOperationGroup::lift

(

)

This will - if a transaction is held - commit the transaction and acquire a new one. This may improve concurrent access.

Referenced by allowLift().

resetTime()

void Digikam::CoreDbOperationGroup::resetTime

(

)

Resets to 0 the time used by allowLift()

setMaximumTime()

void Digikam::CoreDbOperationGroup::setMaximumTime

(

int

msecs

)

Referenced by Digikam::FileActionMngrDatabaseWorker::applyMetadata(), Digikam::FileActionMngrDatabaseWorker::assignColorLabel(), Digikam::FileActionMngrDatabaseWorker::assignPickLabel(), Digikam::FileActionMngrDatabaseWorker::assignRating(), Digikam::DigikamItemView::dragDropSort(), Digikam::FileActionMngrDatabaseWorker::editGroup(), Digikam::AlbumManager::mergeTAlbum(), Digikam::FaceTagsEditor::removeNormalTags(), Digikam::EmptyDTrashItemsJob::run(), and Digikam::FileActionMngrDatabaseWorker::setExifOrientation().

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The documentation for this class was generated from the following files:

• core/libs/database/coredb/coredboperationgroup.h
• core/libs/database/coredb/coredboperationgroup.cpp