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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_c_database_8cpp_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<title>TB9.2 Example Applications: examples/Base/SemaphoreExample/src/CDatabase.cpp Source File</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<link href="doxygen.css" rel="stylesheet" type="text/css"/>
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</head>
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<body>
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<!-- Generated by Doxygen 1.6.2 -->
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<h1>examples/Base/SemaphoreExample/src/CDatabase.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
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<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
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<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
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<a name="l00004"></a>00004 <span class="comment">// under the terms of &quot;Eclipse Public License v1.0&quot;</span>
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<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
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<a name="l00006"></a>00006 <span class="comment">// at the URL &quot;http://www.eclipse.org/legal/epl-v10.html&quot;.</span>
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<a name="l00007"></a>00007 <span class="comment">//</span>
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<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
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<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
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<a name="l00010"></a>00010 <span class="comment">//</span>
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<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
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<a name="l00012"></a>00012 <span class="comment">//</span>
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<a name="l00013"></a>00013 <span class="comment">// Description:</span>
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<a name="l00014"></a>00014 <span class="comment">// This class contains methods to create a database of integers and periodically read /write integers</span>
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<a name="l00015"></a>00015 <span class="comment">// from/ to the database. The macro USE_SEMAPHORE is used at various places to show thread synchronization</span>
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<a name="l00016"></a>00016 <span class="comment">// using a semaphore. </span>
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<a name="l00017"></a>00017
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<a name="l00018"></a>00018 <span class="preprocessor">#include &quot;CDatabase.h&quot;</span>
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<a name="l00019"></a>00019
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<a name="l00020"></a>00020 <span class="comment">//Declare a delay of 1000000 microseconds i.e. 1 sec for the periodic functions. </span>
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<a name="l00021"></a>00021 <span class="keyword">const</span> <span class="keywordtype">int</span> KDelay = 1000000;
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<a name="l00022"></a>00022
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<a name="l00023"></a>00023 <span class="comment">//The last number in the database.</span>
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<a name="l00024"></a>00024 <span class="keyword">const</span> <span class="keywordtype">int</span> KLastNum = 50;
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<a name="l00025"></a>00025
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<a name="l00029"></a><a class="code" href="class_c_database.html#aab355b9be127debd7a5d54e5ac8f9021">00029</a> <a class="code" href="class_c_database.html">CDatabase</a>* <a class="code" href="class_c_database.html#aab355b9be127debd7a5d54e5ac8f9021">CDatabase::NewL</a>()
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<a name="l00030"></a>00030     {
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<a name="l00031"></a>00031     <a class="code" href="class_c_database.html">CDatabase</a>* <span class="keyword">self</span>=<span class="keyword">new</span>(ELeave)<a class="code" href="class_c_database.html">CDatabase</a>();
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<a name="l00032"></a>00032     CleanupStack::PushL(<span class="keyword">self</span>);
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<a name="l00033"></a>00033     <span class="keyword">self</span>-&gt;ConstructL();
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<a name="l00034"></a>00034     CleanupStack::Pop(<span class="keyword">self</span>);
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<a name="l00035"></a>00035     <span class="keywordflow">return</span> <span class="keyword">self</span>;
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<a name="l00036"></a>00036     }
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<a name="l00037"></a>00037
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<a name="l00041"></a><a class="code" href="class_c_database.html#a9a3adb67c04d4f1432556aab4149841e">00041</a> <a class="code" href="class_c_database.html#a9a3adb67c04d4f1432556aab4149841e">CDatabase::~CDatabase</a>()
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<a name="l00042"></a>00042     {
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<a name="l00043"></a>00043     iFsSession.Close();  <span class="comment">//close the file server session. </span>
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<a name="l00044"></a>00044     <span class="keyword">delete</span> iPeriodic;    <span class="comment">//delete the periodic object.</span>
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<a name="l00045"></a>00045     <span class="keyword">delete</span> iConsole;     <span class="comment">//delete the console. </span>
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<a name="l00046"></a>00046 <span class="preprocessor">    #ifdef USE_SEMAPHORE</span>
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<a name="l00047"></a>00047 <span class="preprocessor"></span>    iSemWrite.Close();
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<a name="l00048"></a>00048 <span class="preprocessor">    #endif</span>
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<a name="l00049"></a>00049 <span class="preprocessor"></span>    }
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<a name="l00050"></a>00050
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<a name="l00054"></a><a class="code" href="class_c_database.html#ad3d6215a0fa65e7ead3533065905a747">00054</a> <span class="keywordtype">void</span> <a class="code" href="class_c_database.html#ad3d6215a0fa65e7ead3533065905a747">CDatabase::ConstructL</a>()
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<a name="l00055"></a>00055     {
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<a name="l00056"></a>00056     iPeriodic = <a class="code" href="class_c_database.html#aab355b9be127debd7a5d54e5ac8f9021">CPeriodic::NewL</a>(CActive::EPriorityUserInput);
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<a name="l00057"></a>00057
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<a name="l00058"></a>00058     <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KDbCreateDb,<span class="stringliteral">&quot;exampleDatabase.db&quot;</span>);
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<a name="l00059"></a>00059
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<a name="l00060"></a>00060     iFsSession.Connect();
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<a name="l00061"></a>00061
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<a name="l00062"></a>00062     <span class="comment">//The database exampleDatabase.db is created as a permanent file store </span>
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<a name="l00063"></a>00063     <span class="comment">//in the app&#39;s private directory.</span>
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<a name="l00064"></a>00064     User::LeaveIfError(iFsSession.CreatePrivatePath(RFs::GetSystemDrive()));
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<a name="l00065"></a>00065
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<a name="l00066"></a>00066     User::LeaveIfError(iFsSession.PrivatePath(iDbname));
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<a name="l00067"></a>00067     iDbname.Append(KDbCreateDb);
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<a name="l00068"></a>00068
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<a name="l00069"></a>00069 <span class="preprocessor">    #ifdef USE_SEMAPHORE</span>
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<a name="l00070"></a>00070 <span class="preprocessor"></span>    <span class="comment">//Open the global semaphore which was created in CSemaphoreExample. </span>
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<a name="l00071"></a>00071     <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSemaphoreWrite, <span class="stringliteral">&quot;WriteSemaphore&quot;</span>);
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<a name="l00072"></a>00072     User::LeaveIfError(iSemWrite.OpenGlobal(KSemaphoreWrite, EOwnerProcess));
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<a name="l00073"></a>00073 <span class="preprocessor">    #endif</span>
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<a name="l00074"></a>00074 <span class="preprocessor"></span>    }
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<a name="l00075"></a>00075
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<a name="l00079"></a><a class="code" href="class_c_database.html#a89047671e6c027e4551a8b7a276add96">00079</a> <span class="keywordtype">void</span> <a class="code" href="class_c_database.html#a89047671e6c027e4551a8b7a276add96">CDatabase::CreateDatabaseL</a>()
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<a name="l00080"></a>00080     {
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<a name="l00081"></a>00081     <span class="comment">//Construct a file store object - the file to contain the</span>
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<a name="l00082"></a>00082     <span class="comment">//database replaces any existing file of the same name.</span>
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<a name="l00083"></a>00083     CFileStore* store = CPermanentFileStore::ReplaceLC(iFsSession, iDbname, EFileRead|EFileWrite);
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<a name="l00084"></a>00084     <span class="comment">//Complete file store creation.</span>
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<a name="l00085"></a>00085     store-&gt;SetTypeL(store-&gt;Layout());
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<a name="l00086"></a>00086
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<a name="l00087"></a>00087     <span class="comment">//Create a database in the store.  </span>
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<a name="l00088"></a>00088     TStreamId <span class="keywordtype">id</span>= iDatabase.CreateL(store);
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<a name="l00089"></a>00089
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<a name="l00090"></a>00090     <span class="comment">//Keep database id as root of store.</span>
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<a name="l00091"></a>00091     store-&gt;SetRootL(<span class="keywordtype">id</span>);
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<a name="l00092"></a>00092
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<a name="l00093"></a>00093     <span class="comment">//Complete database creation by commiting the store.</span>
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<a name="l00094"></a>00094     store-&gt;CommitL();
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<a name="l00095"></a>00095
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<a name="l00096"></a>00096
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<a name="l00097"></a>00097     <span class="comment">//Create a table definition.</span>
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<a name="l00098"></a>00098     CDbColSet* columns=CDbColSet::NewLC();
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<a name="l00099"></a>00099
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<a name="l00100"></a>00100     <span class="comment">//Add three columns each containing Int32 values. </span>
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    99
 
<a name="l00101"></a>00101     <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KCol1, <span class="stringliteral">&quot;Number1&quot;</span>);
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<a name="l00102"></a>00102     <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KCol2, <span class="stringliteral">&quot;Number2&quot;</span>);
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   101
 
<a name="l00103"></a>00103     <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KCol3, <span class="stringliteral">&quot;Number3&quot;</span>);
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   102
 
<a name="l00104"></a>00104     columns-&gt;AddL(TDbCol(KCol1,EDbColInt32));
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   103
 
<a name="l00105"></a>00105     columns-&gt;AddL(TDbCol(KCol2,EDbColInt32));
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<a name="l00106"></a>00106     columns-&gt;AddL(TDbCol(KCol3,EDbColInt32));
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diff changeset 
   105
 
<a name="l00107"></a>00107
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   106
 
<a name="l00108"></a>00108
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   107
 
<a name="l00109"></a>00109     <span class="comment">//Create the table, table name is &quot;Numbers&quot; and add the columns to it.</span>
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<a name="l00110"></a>00110     <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTable, <span class="stringliteral">&quot;Numbers&quot;</span>);
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<a name="l00111"></a>00111     User::LeaveIfError(iDatabase.CreateTable(KTable,*columns));
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<a name="l00112"></a>00112
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   111
 
<a name="l00113"></a>00113     CDbKey* key=CDbKey::NewLC();
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   112
 
<a name="l00114"></a>00114
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   113
 
<a name="l00115"></a>00115     <span class="comment">//Add the key columns.</span>
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   114
 
<a name="l00116"></a>00116     TDbKeyCol number1(KCol1);
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   115
 
<a name="l00117"></a>00117     key-&gt;AddL(number1);
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   116
 
<a name="l00118"></a>00118     TDbKeyCol number2(KCol2);
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<a name="l00119"></a>00119     key-&gt;AddL(number2);
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   118
 
<a name="l00120"></a>00120     TDbKeyCol number3(KCol3);
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   119
 
<a name="l00121"></a>00121     key-&gt;AddL(number3);
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<a name="l00122"></a>00122     User::LeaveIfError(iDatabase.CreateIndex(KTable,KTable,*key));
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<a name="l00123"></a>00123
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<a name="l00124"></a>00124     iDatabase.Close();
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<a name="l00125"></a>00125     <span class="comment">//Cleanup the column set.  </span>
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<a name="l00126"></a>00126     CleanupStack::PopAndDestroy(key);
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   125
 
<a name="l00127"></a>00127     CleanupStack::PopAndDestroy(columns);
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<a name="l00128"></a>00128     CleanupStack::PopAndDestroy(store);
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<a name="l00129"></a>00129     }
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<a name="l00130"></a>00130
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   129
 
<a name="l00135"></a><a class="code" href="class_c_database.html#a5df7d7393cfb36c850d562df4f35a0f6">00135</a> <span class="keywordtype">void</span> <a class="code" href="class_c_database.html#a5df7d7393cfb36c850d562df4f35a0f6">CDatabase::WritetoDatabaseL</a>()
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<a name="l00136"></a>00136     {
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   131
 
<a name="l00137"></a>00137     iPeriodic-&gt;Start(0, KDelay, TCallBack(<a class="code" href="class_c_database.html#a726242c03596e80a98deeef4c5c1681c">PeriodicWriteL</a>, <span class="keyword">this</span>));
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<a name="l00138"></a>00138     CActiveScheduler::Start();
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<a name="l00139"></a>00139     }
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<a name="l00140"></a>00140
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   135
 
<a name="l00145"></a><a class="code" href="class_c_database.html#a726242c03596e80a98deeef4c5c1681c">00145</a> TInt <a class="code" href="class_c_database.html#a726242c03596e80a98deeef4c5c1681c">CDatabase::PeriodicWriteL</a>(TAny* aPtr)
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<a name="l00146"></a>00146     {
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<a name="l00147"></a>00147     <a class="code" href="class_c_database.html">CDatabase</a>* ptr = <span class="keyword">static_cast&lt;</span><a class="code" href="class_c_database.html">CDatabase</a>*<span class="keyword">&gt;</span> (aPtr);
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<a name="l00148"></a>00148     <span class="comment">//Invoke the RThread::Resume() function on the consumer thread repeatedly.</span>
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<a name="l00149"></a>00149     ptr-&gt;<a class="code" href="class_c_database.html#a4a0f7606f98a6db98addb52a7ca2b881">PeriodicWriteFuncL</a>();
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<a name="l00150"></a>00150     <span class="keywordflow">return</span> KErrNone;
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<a name="l00151"></a>00151     }
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<a name="l00152"></a>00152
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   143
 
<a name="l00157"></a><a class="code" href="class_c_database.html#a4a0f7606f98a6db98addb52a7ca2b881">00157</a> <span class="keywordtype">void</span> <a class="code" href="class_c_database.html#a4a0f7606f98a6db98addb52a7ca2b881">CDatabase::PeriodicWriteFuncL</a>()
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<a name="l00158"></a>00158     {
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   145
 
<a name="l00159"></a>00159     <span class="comment">//Declare an integer which is used to fill numbers in the database. </span>
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   146
 
<a name="l00160"></a>00160     <span class="keyword">static</span> <span class="keywordtype">int</span> num = 0 ;
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   147
 
<a name="l00161"></a>00161
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   148
 
<a name="l00162"></a>00162      <span class="comment">//Open the file store.</span>
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   149
 
<a name="l00163"></a>00163     <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSQLStatement,<span class="stringliteral">&quot;select Number1, Number2, Number3 from Numbers order by Number1,Number2,Number3&quot;</span>);
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   150
 
<a name="l00164"></a>00164     CFileStore* store = CFileStore::OpenLC(iFsSession,iDbname,EFileRead|EFileWrite);
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   151
 
<a name="l00165"></a>00165
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   152
 
<a name="l00166"></a>00166
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<a name="l00167"></a>00167     <span class="comment">//Open the database from the root stream.</span>
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<a name="l00168"></a>00168     iDatabase.OpenL(store,store-&gt;Root());
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   155
 
<a name="l00169"></a>00169
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   156
 
<a name="l00170"></a>00170     <span class="comment">//Lock the database before use. </span>
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<a name="l00171"></a>00171     iDatabase.Begin();
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<a name="l00172"></a>00172
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   159
 
<a name="l00173"></a>00173     <span class="comment">//Create a view on the database view to read/write numbers into it. </span>
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<a name="l00174"></a>00174     RDbView view;
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<a name="l00175"></a>00175     User::LeaveIfError(view.Prepare(iDatabase,TDbQuery(KSQLStatement,EDbCompareNormal)));
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<a name="l00176"></a>00176     User::LeaveIfError(view.EvaluateAll());
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<a name="l00177"></a>00177
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   164
 
<a name="l00178"></a>00178
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   165
 
<a name="l00179"></a>00179     <span class="comment">//Insert a new row at the end of the database. </span>
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   166
 
<a name="l00180"></a>00180     view.InsertL();
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<a name="l00181"></a>00181
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   168
 
<a name="l00182"></a>00182     <span class="comment">//Fill three coloumns with numbers.</span>
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<a name="l00183"></a>00183     view.SetColL(1, num++);
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<a name="l00184"></a>00184     view.SetColL(2, num++);
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<a name="l00185"></a>00185     view.SetColL(3, num++);
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<a name="l00186"></a>00186     view.PutL();
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<a name="l00187"></a>00187
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   174
 
<a name="l00188"></a>00188     <span class="comment">//Close the view. </span>
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<a name="l00189"></a>00189     view.Close();
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<a name="l00190"></a>00190
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<a name="l00191"></a>00191     <span class="comment">//Unlock the database after writing. </span>
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<a name="l00192"></a>00192     iDatabase.Commit();
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<a name="l00193"></a>00193
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<a name="l00194"></a>00194     <span class="comment">// close the database.</span>
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<a name="l00195"></a>00195     iDatabase.Close();
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<a name="l00196"></a>00196
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<a name="l00197"></a>00197     <span class="comment">//Do not commit store: database has taken control of commit.</span>
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   184
 
<a name="l00198"></a>00198     CleanupStack::PopAndDestroy(store);
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<a name="l00199"></a>00199
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<a name="l00200"></a>00200     <span class="comment">//Cancel the periodic function once 50 numbers have been written to the database.</span>
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<a name="l00201"></a>00201     <span class="keywordflow">if</span>(num &gt; KLastNum )
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<a name="l00202"></a>00202         {
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   189
 
<a name="l00203"></a>00203         iPeriodic-&gt;Cancel();
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<a name="l00204"></a>00204         CActiveScheduler::Stop();
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<a name="l00205"></a>00205         }
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<a name="l00206"></a>00206
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<a name="l00207"></a>00207 <span class="preprocessor">    #ifdef USE_SEMAPHORE</span>
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<a name="l00208"></a>00208 <span class="preprocessor"></span>    <span class="comment">/*Signal the semaphore and the PeriodicReadFunc() which was </span>
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<a name="l00209"></a>00209 <span class="comment">      waiting on the semaphore is scheduled to run. </span>
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<a name="l00210"></a>00210 <span class="comment">      */</span>
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<a name="l00211"></a>00211     iSemWrite.Signal();
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<a name="l00212"></a>00212 <span class="preprocessor">    #endif</span>
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<a name="l00213"></a>00213 <span class="preprocessor"></span>    }
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<a name="l00214"></a>00214
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<a name="l00220"></a><a class="code" href="class_c_database.html#ae9fea33b26bf2ba7cdad59361ee45221">00220</a> <span class="keywordtype">void</span> <a class="code" href="class_c_database.html#ae9fea33b26bf2ba7cdad59361ee45221">CDatabase::ReadfromDatabaseL</a>()
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<a name="l00221"></a>00221     {
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<a name="l00222"></a>00222     <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTextConsoleTitle, <span class="stringliteral">&quot;ReaderThread&quot;</span>);
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<a name="l00223"></a>00223     <span class="keywordflow">if</span>(!iConsole)
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<a name="l00224"></a>00224         {
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<a name="l00225"></a>00225          iConsole = <a class="code" href="class_c_database.html#aab355b9be127debd7a5d54e5ac8f9021">Console::NewL</a>(KTextConsoleTitle, TSize(KConsFullScreen,KConsFullScreen));
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<a name="l00226"></a>00226          <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KReading, <span class="stringliteral">&quot;Reading the database.\n&quot;</span>);
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<a name="l00227"></a>00227          iConsole-&gt;Printf(KReading);
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<a name="l00228"></a>00228         }
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<a name="l00229"></a>00229     iPeriodic-&gt;Start(0, KDelay, TCallBack(<a class="code" href="class_c_database.html#a26f8d942e0dc5c8050afd5cbb0d80f18">PeriodicReadL</a>,<span class="keyword">this</span>));
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<a name="l00230"></a>00230     CActiveScheduler::Start();
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<a name="l00231"></a>00231     }
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<a name="l00232"></a>00232
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<a name="l00237"></a><a class="code" href="class_c_database.html#a26f8d942e0dc5c8050afd5cbb0d80f18">00237</a> TInt <a class="code" href="class_c_database.html#a26f8d942e0dc5c8050afd5cbb0d80f18">CDatabase::PeriodicReadL</a>(TAny* aPtr)
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<a name="l00238"></a>00238     {
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<a name="l00239"></a>00239     <a class="code" href="class_c_database.html">CDatabase</a>* ptr = <span class="keyword">static_cast&lt;</span><a class="code" href="class_c_database.html">CDatabase</a>*<span class="keyword">&gt;</span> (aPtr);
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<a name="l00240"></a>00240     ptr-&gt;<a class="code" href="class_c_database.html#a3546e400216858a7ae560808a9d1465e">PeriodicReadFuncL</a>();
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<a name="l00241"></a>00241     <span class="keywordflow">return</span> KErrNone;
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<a name="l00242"></a>00242     }
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<a name="l00243"></a>00243
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<a name="l00248"></a><a class="code" href="class_c_database.html#a3546e400216858a7ae560808a9d1465e">00248</a> <span class="keywordtype">void</span> <a class="code" href="class_c_database.html#a3546e400216858a7ae560808a9d1465e">CDatabase::PeriodicReadFuncL</a>()
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<a name="l00249"></a>00249     {
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<a name="l00250"></a>00250 <span class="preprocessor">    #ifdef USE_SEMAPHORE</span>
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<a name="l00251"></a>00251 <span class="preprocessor"></span>    <span class="comment">//Semaphore waits till it gets a signal from the PeriodicWrite() function. </span>
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<a name="l00252"></a>00252     iSemWrite.Wait();
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<a name="l00253"></a>00253 <span class="preprocessor">    #endif</span>
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<a name="l00254"></a>00254 <span class="preprocessor"></span>
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<a name="l00255"></a>00255     CFileStore* store = CFileStore::OpenLC(iFsSession,iDbname,EFileRead);
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<a name="l00256"></a>00256
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<a name="l00257"></a>00257     <span class="comment">//Open the database from the root stream.</span>
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<a name="l00258"></a>00258     iDatabase.OpenL(store,store-&gt;Root());
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<a name="l00259"></a>00259
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<a name="l00260"></a>00260     <span class="comment">//Lock the database.</span>
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<a name="l00261"></a>00261     iDatabase.Begin();
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<a name="l00262"></a>00262
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<a name="l00263"></a>00263     <span class="comment">//Prepare an SQL query to read three numbers from the database. </span>
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<a name="l00264"></a>00264     <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSQLStatement,<span class="stringliteral">&quot;select Number1,Number2,Number3  from Numbers order by Number1,Number2, Number3&quot;</span>);
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<a name="l00265"></a>00265
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<a name="l00266"></a>00266     <span class="comment">//Create a view on the database.</span>
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<a name="l00267"></a>00267     RDbView view;
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<a name="l00268"></a>00268     User::LeaveIfError(view.Prepare(iDatabase,TDbQuery(KSQLStatement,EDbCompareNormal)));
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<a name="l00269"></a>00269     User::LeaveIfError(view.EvaluateAll());
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<a name="l00270"></a>00270
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<a name="l00271"></a>00271     <span class="comment">//Declare integers to iterate through the database rows. </span>
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<a name="l00272"></a>00272     <span class="keyword">static</span> <span class="keywordtype">int</span> count = 0;
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<a name="l00273"></a>00273     TInt iter = 0;
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<a name="l00274"></a>00274
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<a name="l00275"></a>00275     <span class="comment">/*Iterate through the database to read only the row which was most recently  </span>
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<a name="l00276"></a>00276 <span class="comment">      written by the PeriodicWriteFunc.</span>
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<a name="l00277"></a>00277 <span class="comment">      */</span>
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<a name="l00278"></a>00278     view.FirstL();
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<a name="l00279"></a>00279     <span class="keywordflow">while</span>( iter &lt; count)
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<a name="l00280"></a>00280         {
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<a name="l00281"></a>00281         view.NextL();
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<a name="l00282"></a>00282         iter++;
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<a name="l00283"></a>00283         }
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<a name="l00284"></a>00284     count ++ ;
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<a name="l00285"></a>00285
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<a name="l00286"></a>00286     <span class="comment">//Read the integers from the view and display in console. </span>
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<a name="l00287"></a>00287     view.GetL();
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<a name="l00288"></a>00288     TInt number1 = view.ColInt(1);
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<a name="l00289"></a>00289     TInt number2 = view.ColInt(2);
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<a name="l00290"></a>00290     TInt number3 = view.ColInt(3);
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<a name="l00291"></a>00291     <span class="comment">//Prepare a row formatter to print the numbers to the console. </span>
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<a name="l00292"></a>00292     <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KRowFormatter, <span class="stringliteral">&quot;\n reading  %d \t%d\t%d&quot;</span>);
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<a name="l00293"></a>00293
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<a name="l00294"></a>00294     iConsole-&gt;Printf(KRowFormatter,number1,number2, number3);
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<a name="l00295"></a>00295
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<a name="l00296"></a>00296     <span class="comment">//Cancel the periodic function after it has read the last number in the database.  </span>
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<a name="l00297"></a>00297     <span class="keywordflow">if</span>(number3 &gt;= KLastNum)
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<a name="l00298"></a>00298         {
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<a name="l00299"></a>00299         iPeriodic-&gt;Cancel();
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<a name="l00300"></a>00300         CActiveScheduler::Stop();
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<a name="l00301"></a>00301         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KAllRead, <span class="stringliteral">&quot;\nAll the numbers in the database have been read\n&quot;</span>);
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<a name="l00302"></a>00302         iConsole-&gt;Printf(KAllRead);
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<a name="l00303"></a>00303         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KExit, <span class="stringliteral">&quot;Press a key to exit\n&quot;</span>);
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<a name="l00304"></a>00304         iConsole-&gt;Printf(KExit);
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<a name="l00305"></a>00305         iConsole-&gt;Getch();
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<a name="l00306"></a>00306         }
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<a name="l00307"></a>00307     <span class="comment">//Close the view. </span>
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<a name="l00308"></a>00308     view.Close();
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<a name="l00309"></a>00309
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<a name="l00310"></a>00310     <span class="comment">//Unlock the database. </span>
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<a name="l00311"></a>00311     iDatabase.Commit();
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<a name="l00312"></a>00312
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<a name="l00313"></a>00313     iDatabase.Close();
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<a name="l00314"></a>00314     CleanupStack::PopAndDestroy(store);
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<a name="l00315"></a>00315     }
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</pre></div></div>
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<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
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</body>
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</html>
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