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Symbian3/PDK/Source/GUID-9E83A253-3C7F-58E9-94FE-EC127BE9C026.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 5 f345bda72bc4
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 5
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<?xml version="1.0" encoding="utf-8"?>
578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 5
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 5
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<!-- This component and the accompanying materials are made available under the terms of the License
578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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"Eclipse Public License v1.0" which accompanies this distribution,
578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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parents: 5
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 5
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<!-- Initial Contributors:
578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
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    Nokia Corporation - initial contribution.
578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 5
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Contributors:
578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 5
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-->
578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 5
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<!DOCTYPE concept
578be2adaf3e Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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25a17d01db0c Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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<concept xml:lang="en" id="GUID-9E83A253-3C7F-58E9-94FE-EC127BE9C026"><title>Transaction Notifications</title><prolog><metadata><keywords/></metadata></prolog><conbody><section id="GUID-30596B27-BF0F-544C-80DF-199352143AF2"><title>Overview</title> <p>Database events are not sent to observers during a transaction. Instead, they are queued by the server and only sent once the transaction is committed. If the transaction is cancelled (if a rollback occurs) then none of the queued events will be sent to observers apart from the <xref href="GUID-4695321C-1745-3173-8D8E-5FBE89445F55.dita"><apiname>EContactDbObserverEventRollback</apiname></xref> event. </p> </section> <section id="GUID-E66C3FE1-08D2-541E-AE24-CEE5F47CD967"><title>Transaction Related APIs</title> <p>The behaviour described above comes into effect when using the following APIs: </p> <ul><li id="GUID-CC0201D5-B1EF-53E1-9E5C-856097990DAD"><p> <xref href="GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89.dita#GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89/GUID-D21FF939-216E-3C3C-B9A6-3D04A3C62A9A"><apiname>void CContactDatabase::DatabaseBeginL(…)</apiname></xref>  </p> </li> <li id="GUID-81700472-6AAF-5334-BEE9-4BC77CDDE9EC"><p> <xref href="GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89.dita#GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89/GUID-D2F11144-62B4-3A60-AF6F-C2BCD2D2AB75"><apiname>void CContactDatabase::DatabaseBeginLC(…)</apiname></xref>  </p> </li> <li id="GUID-49592F0D-7A8C-5ED5-A86E-68F887AA4C65"><p> <xref href="GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89.dita#GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89/GUID-1E22B186-3CBF-3CD7-A165-D2BBDA1B25CA"><apiname>void CContactDatabase::DatabaseCommitL(…)</apiname></xref>  </p> </li> <li id="GUID-6D428B8B-B88F-50EB-A8A4-558E6189B815"><p> <xref href="GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89.dita#GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89/GUID-44F9D847-5AC6-3860-8B85-2E9B58DE3DB7"><apiname>void CContactDatabase::DatabaseCommitLP(…)</apiname></xref>  </p> </li> <li id="GUID-FA7C6C21-CF7F-553F-BFE7-AD9509E104AA"><p> <xref href="GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89.dita#GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89/GUID-48DAF2AB-685B-3A64-87F8-940ACD8B45AF"><apiname>void CContactDatabase::DeleteContactsL(…)</apiname></xref>  </p> </li> <li id="GUID-FA898881-803E-5DD7-8E16-26A0CD07F7E4"><p> <xref href="GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89.dita#GUID-76906F78-4D8A-3ECA-832E-BD996F54EB89/GUID-C2B81C2C-6F85-3032-A513-FED13B55C049"><apiname>void CContactDatabase::DatabaseRollback()</apiname></xref>  </p> </li> </ul> </section> <section id="GUID-51302568-7DEE-5E51-A635-BF62C2566D69"><title>Implementation Considerations </title> <p>A maximum of 1000 database events will be queued during a transaction. If there are more events than this then the queued events will be discarded. When the transaction is committed the <xref href="GUID-E3B188B5-36BF-33AF-AED6-1394CAA52F80.dita"><apiname>EContactDbObserverEventUnknownChanges</apiname></xref> event will be sent to observers instead. </p> <p>It is important to note that in the previous version of the Contacts Model database events were sent to observers as they occurred during a transaction. The new model behaviour is more appropriate since, when a rollback occurs, there is no point in receiving events for operations which never actually happened (that is, were not committed). </p> </section> </conbody></concept>
FCL/sftools/depl/docscontent