<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

<!-- This component and the accompanying materials are made available under the terms of the License 

"Eclipse Public License v1.0" which accompanies this distribution, 

and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

<!-- Initial Contributors:

    Nokia Corporation - initial contribution.

Contributors: 

-->

<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-EFA822E0-BE80-5EB8-82E5-1659BDB1BDD9" xml:lang="en"><title>Named

database</title><shortdesc>Describes how databases can be created and opened using the database

name.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>In order to support the DBMS client-server interface, the <codeph>RDbNamedDatabase</codeph> class

provides the interface for creating and opening databases identified by name.</p>

<p>The mechanism is generic; the database is identified by its name and the

database format. The format is a name that is used to identify the implementation

used for creating or opening that database. There is a default format, which

has the name "epoc". The default format is a store database in the root stream

of the database file.</p>

<p>If required, other formats can be provided in extension DBMS driver libraries.

These formats need no be file-based. Additional DBMS driver libraries are

dynamically bound to the API at run-time, if one can be found to support the

format requested.</p>

<p>Formats which are UidTyped files, such as the default, can allow the client

to specify a 3rd Uid by extending the format name with the Uid name (as generated

by the <codeph>Name()</codeph> member function of <codeph>TUid</codeph>, an

8 digit hexadecimal number enclosed in square brackets).</p>

<p>If specified, this is also checked when a database is opened. e.g. creating

a FileStore database “C:\My Database” with a 3rd Uid of 0x10001234:</p>

<codeblock id="GUID-2291B3E7-D3D5-5E99-8ACA-886163557978" xml:space="preserve">_LIT(KMydatabase,"C:\\My Database");

_LIT(KDemoUid,"[10001234]");

RDbNamedDatabase database;

TInt r=database.Create(fs,KMydatabase,KDemoUid);</codeblock>

<p>For comparison, the equivalent code required to create an <codeph>RDbStoreDatabase</codeph> in

the root of a <codeph>CPermanentFileStore</codeph> would have been:</p>

<codeblock id="GUID-B103A01B-55C0-50B5-81F7-F2763E5E16DB" xml:space="preserve">_LIT(KMydatabase,"C:\\My Database");

CFileStore* fstore=CPermanentFileStore::ReplaceLC(fs,KMydatabase,EFileWrite);

fstore->SetTypeL(TUidType(fstore->Layout(),KDatabaseUid,TUid::Uid(0x10001234)));

RDbStoreDatabase database;

fstore->SetRootL(database.CreateL(fstore));

fstore-&gt;CommitL();</codeblock>

<p>A named database may be encrypted; the default is an un-encrypted database.</p>

</conbody></concept>