author | Graeme Price <GRAEME.PRICE@NOKIA.COM> |
Fri, 15 Oct 2010 14:32:18 +0100 | |
changeset 15 | 307f4279f433 |
parent 7 | 51a74ef9ed63 |
permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-95448841-5E5B-54C4-85A7-DCE6D078E036" xml:lang="en"><title>Constructing |
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an embedded store</title><shortdesc>Embedded stores are represented by an instance of the <codeph>CEmbeddedStore</codeph> class.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>A <codeph>CEmbeddedStore</codeph> object is constructed from a host stream. </p> |
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<p>When the <codeph>CEmbeddedStore</codeph> object represents a new embedded |
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store, it is constructed from an <codeph>RWriteStream</codeph> object; for |
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example, a class might include the following code fragment in one of its functions:</p> |
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<codeblock id="GUID-47D69E5D-909D-5EA3-96CD-3FB6ED5E77CB" xml:space="preserve">... |
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// create the stream to contain the embedded store |
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RStoreWriteStream childStream; |
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// we need to keep track of this stream id |
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iEmbeddedStoreId = childStream.CreateLC(iStore); |
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// construct the embedded store |
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CPersistentStore* embeddedStore = CEmbeddedStore::NewLC(childStream); |
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...</codeblock> |
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<p>Here, the code assumes that <codeph>iStore</codeph> refers to the top level |
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store and <codeph>iEmbeddedStoreId</codeph> is a data member to hold the ID |
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of the hosting stream.</p> |
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<p>On successful construction, ownership of the host stream passes to the |
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embedded store which means that the embedded store takes on the responsibility |
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for closing the stream.</p> |
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<p>When the <codeph>CEmbeddedStore</codeph> object represents an existing |
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embedded store, it is constructed from an <codeph>RReadStream</codeph> object; |
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for example, a class might include the following code fragment in one of its |
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functions:</p> |
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<codeblock id="GUID-A796CC6C-69C9-5F22-B7A1-30815086EAA3" xml:space="preserve">... |
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RStoreReadStream childStream; |
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childStream.OpenL(iStore,iEmbeddedStoreId); |
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iEmbeddedStore = CEmbeddedStore::FromL(childStream); |
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...</codeblock> |
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<p>Where:</p> |
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<ul> |
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<li id="GUID-7A3338F6-252E-5D47-9D22-CDD505222958"><p><codeph>iStore</codeph> refers |
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to the top level store</p> </li> |
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<li id="GUID-162A3315-AA91-55CD-B07A-2F02EDBCC5ED"><p><codeph>iEmbeddedStoreId</codeph> is |
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a data member that holds the ID of the hosting stream</p> </li> |
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<li id="GUID-8AE6849E-0BA8-5CB4-8F3F-B33CC4FEED4E"><p><codeph>iEmbeddedStore</codeph> holds |
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a reference to the embedded store object.</p> </li> |
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</ul> |
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<p>When saving data, an application re-creates the embedded store by re-writing |
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the complete partial object network to the embedded store, replacing any existing |
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data.</p> |
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</conbody></concept> |