author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Fri, 11 Jun 2010 12:39:03 +0100 | |
changeset 8 | ae94777fff8f |
parent 7 | 51a74ef9ed63 |
child 13 | 48780e181b38 |
permissions | -rw-r--r-- |
8
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Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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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 |
ae94777fff8f
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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-231840A2-255B-5200-8AD1-1D7667FCB448" xml:lang="en"><title>What |
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are records</title><shortdesc>This topic describes the structure of record. A record is an item |
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that can be stored in the Comms Database. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>A record is a container and an element. A record refers to a set of fields |
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in a defined order. A set or records that has the same fields in the same |
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order can be called a recordset or a table. Fields in a given position make |
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a column. A column is conceptual. The CommsDat API has no C++ item defined |
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Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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as a column. </p> |
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<p>There are two types of record: </p> |
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Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<ul> |
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<li id="GUID-5989B5E3-1995-5E12-8BB6-30136BA7DA09"><p>records defined at system |
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compile time - these records have named fields and are defined by Symbian |
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platform. </p> </li> |
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<li id="GUID-E5B40BE7-13D4-5EE1-B005-1D00EAB0A7BC"><p>records defined by the |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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user - these records are defined at run time - they are not known to Symbian |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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platform when Symbian platform is built. </p> </li> |
ae94777fff8f
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</ul> |
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<section id="GUID-6AB91FBD-F293-4563-964C-1A6C7F1459DB"><title>Records defined at system compile time</title> <p> </p> <p>The |
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class <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CCDRecordBase</apiname></xref> represents a Symbian |
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platform defined record. All Symbian platform defined records inherit from <codeph>CCDRecordBase</codeph>. |
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An individual named record is an instance of a class derived from <codeph>CCDRecordBase</codeph>. |
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Symbian platform creates an individual named record and assigns a unique numeric |
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Id. Symbian platform defines the class and the unique Id before the system |
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is built. </p> <p>The class defines a schema for the record. A schema is a |
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pattern for the record that all records of this type follow. The class contains |
ae94777fff8f
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a set of fields and links to other records. </p> <fig id="GUID-A331560C-9996-55E8-8C64-7BB2D5D0C1C6"> |
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<image href="GUID-DB9F413A-35E2-577E-91C3-1D519835FAB4_d0e79595_href.png" placement="inline"/> |
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</fig> <p>For example, Symbian platform defines the class <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CCDIAPRecord</apiname></xref>. |
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The class represents an Internet Access Point (IAP) record. A set of IAP records |
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form an IAP table. Symbian platform assigns the unique numeric Id <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>KCDTIdIAPRecord</apiname></xref> to a record of this type. </p> <p>The |
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public data members of this class are the fields and links that make the record. |
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The following code shows part of the class definition. Some parts are omitted |
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- this is not the complete class definition. </p> <codeblock id="GUID-3F6A91C8-BF0E-50E9-B49B-C363816179E5" xml:space="preserve">class CCDIAPRecord : public CCDRecordBase |
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{ |
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public: |
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CMDBField<TDesC> iServiceType; |
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CMDBRecordLink<CCDServiceRecordBase> iService; |
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CMDBField<TDesC> iBearerType; |
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CMDBRecordLink<CCDBearerRecordBase> iBearer; |
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CMDBRecordLink<CCDNetworkRecord> iNetwork; |
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CMDBField<TUint32> iNetworkWeighting; |
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CMDBRecordLink<CCDLocationRecord> iLocation; |
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... |
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} |
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</codeblock> <p>To create an instance of a Symbian platform defined record |
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in memory, use the factory function: <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CommsDat::CCDRecordBase::RecordFactoryL()</apiname></xref>. </p> <p>Tools |
ae94777fff8f
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and applications can also create an instance of a Symbian platform defined |
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record in memory, and copy it from another record. Use the factory function: <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CommsDat::CCDRecordBase::CreateCopyRecord()</apiname></xref>. </p> <p>Fields |
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are public data members of a Symbian platform defined record. Tools and applications |
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access the fields directly. </p> <p>Tools and applications can use the <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CommsDat::CCDRecordBase::GetFieldByNameL()</apiname></xref> or <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CommsDat::CCDRecordBase::GetFieldByIdL()</apiname></xref> functions |
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to find fields in a Symbian platform defined record. These methods are <i>not</i> recommended. |
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It is more efficient to access the fields directly. </p> </section> |
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<section id="GUID-33F78080-476A-462D-B2A3-788C21DCF4D2"><title>Records defined by the user</title> <p>The class <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CMDBGenericRecord</apiname></xref> represents a user defined record. |
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All user defined records inherit from <codeph>CMDBGenericRecord</codeph>. |
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User defined records do not have named fields. A tool or application supplies |
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a schema at run time. The schema defines the structure of the record. </p> <p>A |
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schema is an array of <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>SGenericRecordTypeInfo</apiname></xref> objects. |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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Each item in the array defines the fields in the record in order. </p> <p>Tools |
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and applications can use the <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CommsDat::CMDBGenericRecord::InitializeL()</apiname></xref> function |
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to initialise a record in memory. Tools and Applications can also get use |
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the <codeph>LoadL()</codeph> and <codeph>FindL()</codeph> functions to get |
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the the table schema from the Comms Database. </p> <fig id="GUID-BCE5A2B5-C328-594A-A213-C4AFB48BBF68"> |
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<image href="GUID-78AAEDF8-6C31-53E3-B411-3463DDAAC902_d0e79683_href.png" placement="inline"/> |
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</fig> <p> </p> <p>You use the same methods to create, store and access user |
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defined records that Symbian platform defined records use. Symbian platform |
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backs up user defined data and secures user defined data with Platform Security. |
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Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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Symbian platform does not maintain user defined data formats. </p> <p>Tools |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
diff
changeset
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79 |
and applications must use the <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CommsDat::CCDRecordBase::GetFieldByNameL()</apiname></xref> or <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CommsDat::CCDRecordBase::GetFieldByIdL()</apiname></xref> functions |
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
7
diff
changeset
|
80 |
to find fields in a user defined record. It is more efficient to use <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CommsDat::CCDRecordBase::GetFieldByIdL()</apiname></xref>. </p> </section> |
7
51a74ef9ed63
Week 12 contribution of API Specs and fix SDK submission
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
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81 |
</conbody></concept> |