author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 11 Mar 2010 15:24:26 +0000 | |
changeset 2 | ebc84c812384 |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
0
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
1 |
<?xml version="1.0" encoding="utf-8"?> |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
2 |
<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
3 |
<!-- This component and the accompanying materials are made available under the terms of the License |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
4 |
"Eclipse Public License v1.0" which accompanies this distribution, |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
5 |
and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
6 |
<!-- Initial Contributors: |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
7 |
Nokia Corporation - initial contribution. |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
8 |
Contributors: |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
9 |
--> |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
10 |
<!DOCTYPE concept |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
11 |
PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
12 |
<concept xml:lang="en" id="GUID-95448841-5E5B-54C4-85A7-DCE6D078E036"><title>Constructing an embedded store</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>Embedded stores are represented by an instance of the <codeph>CEmbeddedStore</codeph> class.</p> <p>A <codeph>CEmbeddedStore</codeph> object is constructed from a host stream. </p> <p>When the <codeph>CEmbeddedStore</codeph> object represents a new embedded store, it is constructed from an <codeph>RWriteStream</codeph> object; for example, a class might include the following code fragment in one of its functions:</p> <codeblock id="GUID-47D69E5D-909D-5EA3-96CD-3FB6ED5E77CB" xml:space="preserve">... |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
13 |
// create the stream to contain the embedded store |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
14 |
RStoreWriteStream childStream; |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
15 |
// we need to keep track of this stream id |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
16 |
iEmbeddedStoreId = childStream.CreateLC(iStore); |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
17 |
// construct the embedded store |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
18 |
CPersistentStore* embeddedStore = CEmbeddedStore::NewLC(childStream); |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
19 |
...</codeblock> <p>Here, the code assumes that <codeph>iStore</codeph> refers to the top level store and <codeph>iEmbeddedStoreId</codeph> is a data member to hold the ID of the hosting stream.</p> <p>On successful construction, ownership of the host stream passes to the embedded store which means that the embedded store takes on the responsibility for closing the stream.</p> <p>When the <codeph>CEmbeddedStore</codeph> object represents an existing embedded store, it is constructed from an <codeph>RReadStream</codeph> object; for example, a class might include the following code fragment in one of its functions:</p> <codeblock id="GUID-A796CC6C-69C9-5F22-B7A1-30815086EAA3" xml:space="preserve">... |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
20 |
RStoreReadStream childStream; |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
21 |
childStream.OpenL(iStore,iEmbeddedStoreId); |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
22 |
iEmbeddedStore = CEmbeddedStore::FromL(childStream); |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
23 |
...</codeblock> <p>Where:</p> <ul><li id="GUID-7A3338F6-252E-5D47-9D22-CDD505222958"><p><codeph>iStore</codeph> refers to the top level store</p> </li> <li id="GUID-162A3315-AA91-55CD-B07A-2F02EDBCC5ED"><p><codeph>iEmbeddedStoreId</codeph> is a data member that holds the ID of the hosting stream</p> </li> <li id="GUID-8AE6849E-0BA8-5CB4-8F3F-B33CC4FEED4E"><p><codeph>iEmbeddedStore</codeph> holds a reference to the embedded store object.</p> </li> </ul> <p>When saving data, an application re-creates the embedded store by re-writing the complete partial object network to the embedded store, replacing any existing data.</p> </conbody></concept> |