Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_d_b_m_s_engine_8cpp_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/ForumNokia/DBMS/src/DBMSEngine.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright © 2008 Nokia Corporation.</span>
<a name="l00003"></a>00003 <span class="comment"> */</span>
<a name="l00004"></a>00004
<a name="l00005"></a>00005 <span class="preprocessor">#include <badesca.h></span> <span class="comment">// CDesCArrayFlat</span>
<a name="l00006"></a>00006 <span class="preprocessor">#include <s32file.h></span> <span class="comment">// CFileStore & CPermanentFileStore</span>
<a name="l00007"></a>00007 <span class="preprocessor">#include <bautils.h></span> <span class="comment">// file helpers</span>
<a name="l00008"></a>00008 <span class="preprocessor">#include <eikenv.h></span>
<a name="l00009"></a>00009 <span class="preprocessor">#include "DBMSEngine.h"</span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="comment">// Implementation specific constants</span>
<a name="l00012"></a>00012 <span class="keyword">const</span> <span class="keywordtype">int</span> KCustomSqlMaxLength = 256;
<a name="l00013"></a>00013 <span class="keyword">const</span> <span class="keywordtype">int</span> KArrayGranularity = 5; <span class="comment">// for CDesCArrayFlat</span>
<a name="l00014"></a>00014
<a name="l00015"></a>00015 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00016"></a>00016 <span class="comment">// CBookDb::NewL()</span>
<a name="l00017"></a>00017 <span class="comment">//</span>
<a name="l00018"></a>00018 <span class="comment">// Create instance of the Book database engine.</span>
<a name="l00019"></a>00019 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00020"></a><a class="code" href="class_c_book_db.html#a87b80f9d2487d6ad27c109293c7d6bdd">00020</a> <a class="code" href="class_c_book_db.html">CBookDb</a>* <a class="code" href="class_c_book_db.html#a87b80f9d2487d6ad27c109293c7d6bdd">CBookDb::NewL</a>()
<a name="l00021"></a>00021 {
<a name="l00022"></a>00022 <a class="code" href="class_c_book_db.html">CBookDb</a>* tmp = <span class="keyword">new</span> (ELeave)<a class="code" href="class_c_book_db.html">CBookDb</a>();
<a name="l00023"></a>00023 CleanupStack::PushL(tmp);
<a name="l00024"></a>00024 tmp->ConstructL();
<a name="l00025"></a>00025 CleanupStack::Pop();
<a name="l00026"></a>00026 <span class="keywordflow">return</span> tmp;
<a name="l00027"></a>00027 }
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00030"></a>00030 <span class="comment">// CBookDb::~CBookDb()</span>
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00032"></a>00032 <span class="comment">// Destructor of the Book database engine. Release resources.</span>
<a name="l00033"></a>00033 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00034"></a><a class="code" href="class_c_book_db.html#a1cff43523b8c167b07ab7cd530f06cf2">00034</a> <a class="code" href="class_c_book_db.html#a1cff43523b8c167b07ab7cd530f06cf2">CBookDb::~CBookDb</a>()
<a name="l00035"></a>00035 {
<a name="l00036"></a>00036 <a class="code" href="class_c_book_db.html#a3487424c728056eb2a95b0108dd46473">Close</a>(); <span class="comment">// Just in case, if the user does not close this explicitely</span>
<a name="l00037"></a>00037 iFsSession.Close();
<a name="l00038"></a>00038 }
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00041"></a>00041 <span class="comment">// CBookDb::ConstructL()</span>
<a name="l00042"></a>00042 <span class="comment">//</span>
<a name="l00043"></a>00043 <span class="comment">// Second phase construction. Leaves, if RFs session cannot be created.</span>
<a name="l00044"></a>00044 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00045"></a>00045 <span class="keywordtype">void</span> CBookDb::ConstructL()
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047 TInt err = iFsSession.Connect();
<a name="l00048"></a>00048 <span class="keywordflow">if</span>(err)
<a name="l00049"></a>00049 User::Leave(err);
<a name="l00050"></a>00050 }
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00053"></a>00053 <span class="comment">// CBookDb::CBookDb()</span>
<a name="l00054"></a>00054 <span class="comment">//</span>
<a name="l00055"></a>00055 <span class="comment">// Constructor</span>
<a name="l00056"></a>00056 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00057"></a>00057 CBookDb::CBookDb()
<a name="l00058"></a>00058 {
<a name="l00059"></a>00059 iOpen = EFalse;
<a name="l00060"></a>00060 }
<a name="l00061"></a>00061
<a name="l00062"></a>00062 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00063"></a>00063 <span class="comment">// CBookDb::OpenDbL()</span>
<a name="l00064"></a>00064 <span class="comment">//</span>
<a name="l00065"></a>00065 <span class="comment">// Open existing Book database for exclusive access.</span>
<a name="l00066"></a>00066 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00067"></a><a class="code" href="class_c_book_db.html#adad67a3cd76d53b953e568e6800d39fa">00067</a> TInt <a class="code" href="class_c_book_db.html#adad67a3cd76d53b953e568e6800d39fa">CBookDb::OpenDb</a>(<span class="keyword">const</span> TFileName& aExistingBookFile)
<a name="l00068"></a>00068 {
<a name="l00069"></a>00069 <a class="code" href="class_c_book_db.html#a3487424c728056eb2a95b0108dd46473">Close</a>();
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="keywordflow">if</span>(!BaflUtils::FileExists(iFsSession, aExistingBookFile))
<a name="l00072"></a>00072 {
<a name="l00073"></a>00073 <span class="keywordflow">return</span> KErrNotFound;
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075
<a name="l00076"></a>00076 TRAPD(error,
<a name="l00077"></a>00077 iFileStore = CPermanentFileStore::OpenL(iFsSession, aExistingBookFile,
<a name="l00078"></a>00078 EFileRead|EFileWrite);
<a name="l00079"></a>00079 iFileStore->SetTypeL(iFileStore->Layout());<span class="comment">/* Set file store type*/</span>
<a name="l00080"></a>00080 iBookDb.OpenL(iFileStore,iFileStore->Root())
<a name="l00081"></a>00081 );
<a name="l00082"></a>00082 <span class="keywordflow">if</span>(error!=KErrNone)
<a name="l00083"></a>00083 {
<a name="l00084"></a>00084 <span class="keywordflow">return</span> error;
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086
<a name="l00087"></a>00087 iOpen = ETrue;
<a name="l00088"></a>00088 <span class="keywordflow">return</span> KErrNone;
<a name="l00089"></a>00089 }
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00092"></a>00092 <span class="comment">// CBookDb::CreateDbL()</span>
<a name="l00093"></a>00093 <span class="comment">//</span>
<a name="l00094"></a>00094 <span class="comment">// Create a new database. The database will be in exclusive access mode.</span>
<a name="l00095"></a>00095 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00096"></a><a class="code" href="class_c_book_db.html#a63294e77864336caff068a0d8328084c">00096</a> TInt <a class="code" href="class_c_book_db.html#a63294e77864336caff068a0d8328084c">CBookDb::CreateDb</a>(<span class="keyword">const</span> TFileName& aNewBookFile)
<a name="l00097"></a>00097 {
<a name="l00098"></a>00098 <a class="code" href="class_c_book_db.html#a3487424c728056eb2a95b0108dd46473">Close</a>();
<a name="l00099"></a>00099
<a name="l00100"></a>00100 <span class="comment">// Create empty database file.</span>
<a name="l00101"></a>00101 TRAPD(error,
<a name="l00102"></a>00102 iFileStore = CPermanentFileStore::ReplaceL(iFsSession, aNewBookFile,
<a name="l00103"></a>00103 EFileRead|EFileWrite);
<a name="l00104"></a>00104 iFileStore->SetTypeL(iFileStore->Layout());<span class="comment">// Set file store type</span>
<a name="l00105"></a>00105 TStreamId <span class="keywordtype">id</span> = iBookDb.CreateL(iFileStore);<span class="comment">// Create stream object</span>
<a name="l00106"></a>00106 iFileStore->SetRootL(<span class="keywordtype">id</span>);<span class="comment">// Keep database id as root of store</span>
<a name="l00107"></a>00107 iFileStore->CommitL();<span class="comment">// Complete creation by commiting</span>
<a name="l00108"></a>00108 <span class="comment">// Create Book tables and indexes</span>
<a name="l00109"></a>00109 CreateBooksTableL();
<a name="l00110"></a>00110 CreateBooksIndexL();
<a name="l00111"></a>00111 );
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="keywordflow">if</span>(error!=KErrNone)
<a name="l00114"></a>00114 {
<a name="l00115"></a>00115 <span class="keywordflow">return</span> error;
<a name="l00116"></a>00116 }
<a name="l00117"></a>00117 iOpen = ETrue;
<a name="l00118"></a>00118 <span class="keywordflow">return</span> KErrNone;
<a name="l00119"></a>00119 }
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00122"></a>00122 <span class="comment">// CBookDb::RemoveDb()</span>
<a name="l00123"></a>00123 <span class="comment">//</span>
<a name="l00124"></a>00124 <span class="comment">// First remove the Books table. Then remove the database file.</span>
<a name="l00125"></a>00125 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00126"></a><a class="code" href="class_c_book_db.html#a2a68483e682d42b6cbde02dc2abaf7b1">00126</a> TInt <a class="code" href="class_c_book_db.html#a2a68483e682d42b6cbde02dc2abaf7b1">CBookDb::RemoveDb</a>(<span class="keyword">const</span> TFileName& aExistingBookFile)
<a name="l00127"></a>00127 {
<a name="l00128"></a>00128 <a class="code" href="class_c_book_db.html#a3487424c728056eb2a95b0108dd46473">Close</a>();
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <span class="keywordflow">if</span>(!BaflUtils::FileExists(iFsSession, aExistingBookFile))
<a name="l00131"></a>00131 {
<a name="l00132"></a>00132 <span class="keywordflow">return</span> KErrNotFound;
<a name="l00133"></a>00133 }
<a name="l00134"></a>00134
<a name="l00135"></a>00135 <span class="comment">// It is enough to delete the database file directly. Because this example</span>
<a name="l00136"></a>00136 <span class="comment">// demonstrates DDL statements, it first opens and drops the Books table.</span>
<a name="l00137"></a>00137
<a name="l00138"></a>00138 TInt error = <a class="code" href="class_c_book_db.html#adad67a3cd76d53b953e568e6800d39fa">OpenDb</a>(aExistingBookFile);
<a name="l00139"></a>00139 <span class="keywordflow">if</span>(error!=KErrNone)
<a name="l00140"></a>00140 {
<a name="l00141"></a>00141 <span class="keywordflow">return</span> error;
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143
<a name="l00144"></a>00144 DropBooksTable();
<a name="l00145"></a>00145 <a class="code" href="class_c_book_db.html#a3487424c728056eb2a95b0108dd46473">Close</a>();
<a name="l00146"></a>00146
<a name="l00147"></a>00147 iFsSession.Delete(aExistingBookFile);
<a name="l00148"></a>00148 <span class="keywordflow">return</span> KErrNone;
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150
<a name="l00151"></a>00151 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00152"></a>00152 <span class="comment">// CBookDb::Close()</span>
<a name="l00153"></a>00153 <span class="comment">//</span>
<a name="l00154"></a>00154 <span class="comment">// Close the database.</span>
<a name="l00155"></a>00155 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00156"></a><a class="code" href="class_c_book_db.html#a3487424c728056eb2a95b0108dd46473">00156</a> TInt <a class="code" href="class_c_book_db.html#a3487424c728056eb2a95b0108dd46473">CBookDb::Close</a>()
<a name="l00157"></a>00157 {
<a name="l00158"></a>00158 iBookDb.Close();
<a name="l00159"></a>00159 <span class="keywordflow">if</span>(iFileStore)
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 <span class="keyword">delete</span> iFileStore;
<a name="l00162"></a>00162 iFileStore = NULL;
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 iOpen = EFalse;
<a name="l00165"></a>00165 <span class="keywordflow">return</span> KErrNone;
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00169"></a>00169 <span class="comment">// CBookDb::IsOpen()</span>
<a name="l00170"></a>00170 <span class="comment">//</span>
<a name="l00171"></a>00171 <span class="comment">// Return open status of the database.</span>
<a name="l00172"></a>00172 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00173"></a><a class="code" href="class_c_book_db.html#adf1b55c6f6f22739b4546dd180f39967">00173</a> TBool <a class="code" href="class_c_book_db.html#adf1b55c6f6f22739b4546dd180f39967">CBookDb::IsOpen</a>()<span class="keyword"> const</span>
<a name="l00174"></a>00174 <span class="keyword"> </span>{
<a name="l00175"></a>00175 <span class="keywordflow">return</span> iOpen;
<a name="l00176"></a>00176 }
<a name="l00177"></a>00177
<a name="l00178"></a>00178 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00179"></a>00179 <span class="comment">// CBookDb::CreateBooksTableL()</span>
<a name="l00180"></a>00180 <span class="comment">//</span>
<a name="l00181"></a>00181 <span class="comment">// Creates Books table. Leaves, if the table cannot be created.</span>
<a name="l00182"></a>00182 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00183"></a>00183 <span class="keywordtype">void</span> CBookDb::CreateBooksTableL()
<a name="l00184"></a>00184 {
<a name="l00185"></a>00185
<a name="l00186"></a>00186 <span class="comment">// Specify columns for Books table</span>
<a name="l00187"></a>00187 TDbCol authorCol(KBooksAuthorCol, EDbColText); <span class="comment">// Using default length</span>
<a name="l00188"></a>00188 TDbCol titleCol(KBooksTitleCol, EDbColText, KTitleMaxLength);
<a name="l00189"></a>00189 titleCol.iAttributes = TDbCol::ENotNull;
<a name="l00190"></a>00190 TDbCol descriptionCol(KBooksDescriptionCol, EDbColLongText); <span class="comment">// Stream Data</span>
<a name="l00191"></a>00191
<a name="l00192"></a>00192 <span class="comment">// Add the columns to column set</span>
<a name="l00193"></a>00193 CDbColSet* bookColSet = CDbColSet::NewLC();
<a name="l00194"></a>00194 bookColSet->AddL(authorCol);
<a name="l00195"></a>00195 bookColSet->AddL(titleCol);
<a name="l00196"></a>00196 bookColSet->AddL(descriptionCol);
<a name="l00197"></a>00197
<a name="l00198"></a>00198 <span class="comment">// Create the Books table</span>
<a name="l00199"></a>00199 User::LeaveIfError(iBookDb.CreateTable(KBooksTable,
<a name="l00200"></a>00200 *bookColSet));
<a name="l00201"></a>00201 CleanupStack::PopAndDestroy(bookColSet);
<a name="l00202"></a>00202 }
<a name="l00203"></a>00203
<a name="l00204"></a>00204 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00205"></a>00205 <span class="comment">// CBookDb::CreateBooksIndexL()</span>
<a name="l00206"></a>00206 <span class="comment">//</span>
<a name="l00207"></a>00207 <span class="comment">// Creates an index for Books table. Leaves, if the index cannot be created.</span>
<a name="l00208"></a>00208 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00209"></a>00209 <span class="keywordtype">void</span> CBookDb::CreateBooksIndexL()
<a name="l00210"></a>00210 {
<a name="l00211"></a>00211 <span class="comment">// Create index consisting of two columns</span>
<a name="l00212"></a>00212 TDbKeyCol authorCol(KBooksAuthorCol);
<a name="l00213"></a>00213 TDbKeyCol titleCol(KBooksTitleCol);
<a name="l00214"></a>00214
<a name="l00215"></a>00215 CDbKey* index = CDbKey::NewLC(); <span class="comment">// create index key set</span>
<a name="l00216"></a>00216 index->AddL(titleCol);
<a name="l00217"></a>00217 index->AddL(authorCol);
<a name="l00218"></a>00218 User::LeaveIfError(iBookDb.CreateIndex(
<a name="l00219"></a>00219 KBooksIndexName, KBooksTable, *index));
<a name="l00220"></a>00220 CleanupStack::PopAndDestroy(index);
<a name="l00221"></a>00221 }
<a name="l00222"></a>00222
<a name="l00223"></a>00223 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00224"></a>00224 <span class="comment">// CBookDb::DropBooksTable()</span>
<a name="l00225"></a>00225 <span class="comment">//</span>
<a name="l00226"></a>00226 <span class="comment">// Drop the Books table incrementally. Uses RDbIncremental and DDL statement.</span>
<a name="l00227"></a>00227 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00228"></a>00228 <span class="keywordtype">void</span> CBookDb::DropBooksTable()
<a name="l00229"></a>00229 {
<a name="l00230"></a>00230
<a name="l00231"></a>00231 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KDropTable, <span class="stringliteral">"DROP TABLE "</span>);
<a name="l00232"></a>00232
<a name="l00233"></a>00233 <span class="comment">// Sql: DROP TABLE Books</span>
<a name="l00234"></a>00234 TBuf<KCustomSqlMaxLength> sqlStr;
<a name="l00235"></a>00235 sqlStr.Append(KDropTable);
<a name="l00236"></a>00236 sqlStr.Append(KBooksTable);
<a name="l00237"></a>00237
<a name="l00238"></a>00238 RDbIncremental incOp;
<a name="l00239"></a>00239 TInt incStep = 0xFFFF;
<a name="l00240"></a>00240 <span class="comment">// Initialise Execution</span>
<a name="l00241"></a>00241 TInt incStat = incOp.Execute(iBookDb, sqlStr, incStep);
<a name="l00242"></a>00242 <span class="keywordflow">while</span> (incStep>0 && incStat==KErrNone)
<a name="l00243"></a>00243 {
<a name="l00244"></a>00244 incStat = incOp.Next(incStep); <span class="comment">// Do the work</span>
<a name="l00245"></a>00245 }
<a name="l00246"></a>00246 incOp.Close();
<a name="l00247"></a>00247 }
<a name="l00248"></a>00248
<a name="l00249"></a>00249 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00250"></a>00250 <span class="comment">// CBookDb::AddBookWithSqlL()</span>
<a name="l00251"></a>00251 <span class="comment">//</span>
<a name="l00252"></a>00252 <span class="comment">// Add a book to database using RDbView and SQL</span>
<a name="l00253"></a>00253 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00254"></a><a class="code" href="class_c_book_db.html#a3137b55dcff9d2135230a40211321476">00254</a> TInt <a class="code" href="class_c_book_db.html#a3137b55dcff9d2135230a40211321476">CBookDb::AddBookWithSql</a>(<span class="keyword">const</span> TDesC& aAuthor,
<a name="l00255"></a>00255 <span class="keyword">const</span> TDesC& aTitle,
<a name="l00256"></a>00256 <span class="keyword">const</span> TDesC& aDescription)
<a name="l00257"></a>00257 {
<a name="l00258"></a>00258
<a name="l00259"></a>00259 <span class="keywordflow">if</span>(aAuthor.Length()==0 || aTitle.Length()==0 || aDescription.Length()==0)
<a name="l00260"></a>00260 {
<a name="l00261"></a>00261 <span class="keywordflow">return</span> KErrGeneral;
<a name="l00262"></a>00262 }
<a name="l00263"></a>00263
<a name="l00264"></a>00264 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSelect, <span class="stringliteral">"SELECT "</span>);
<a name="l00265"></a>00265 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFrom, <span class="stringliteral">" FROM "</span>);
<a name="l00266"></a>00266 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KOrderBy, <span class="stringliteral">" ORDER BY "</span>);
<a name="l00267"></a>00267 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KDot, <span class="stringliteral">", "</span>);
<a name="l00268"></a>00268
<a name="l00269"></a>00269 <span class="comment">// Sql: SELECT Author, Title, Description FROM Books ORDER BY Title, Author</span>
<a name="l00270"></a>00270 TBuf<KCustomSqlMaxLength> sqlStr;
<a name="l00271"></a>00271
<a name="l00272"></a>00272 sqlStr.Append(KSelect);
<a name="l00273"></a>00273 sqlStr.Append(KBooksAuthorCol);
<a name="l00274"></a>00274 sqlStr.Append(KDot);
<a name="l00275"></a>00275 sqlStr.Append(KBooksTitleCol);
<a name="l00276"></a>00276 sqlStr.Append(KDot);
<a name="l00277"></a>00277 sqlStr.Append(KBooksDescriptionCol);
<a name="l00278"></a>00278 sqlStr.Append(KFrom);
<a name="l00279"></a>00279 sqlStr.Append(KBooksTable);
<a name="l00280"></a>00280 sqlStr.Append(KOrderBy);
<a name="l00281"></a>00281 sqlStr.Append(KBooksTitleCol);
<a name="l00282"></a>00282 sqlStr.Append(KDot);
<a name="l00283"></a>00283 sqlStr.Append(KBooksAuthorCol);
<a name="l00284"></a>00284
<a name="l00285"></a>00285 RDbView view; <span class="comment">// Create a view on the database</span>
<a name="l00286"></a>00286 TInt error;
<a name="l00287"></a>00287 error = view.Prepare(iBookDb, TDbQuery(sqlStr, EDbCompareFolded));
<a name="l00288"></a>00288 <span class="keywordflow">if</span>(error!=KErrNone)
<a name="l00289"></a>00289 {
<a name="l00290"></a>00290 <span class="keywordflow">return</span> error;
<a name="l00291"></a>00291 }
<a name="l00292"></a>00292 error = view.EvaluateAll();
<a name="l00293"></a>00293 <span class="keywordflow">if</span>(error!=KErrNone)
<a name="l00294"></a>00294 {
<a name="l00295"></a>00295 <span class="keywordflow">return</span> error;
<a name="l00296"></a>00296 }
<a name="l00297"></a>00297 RDbColWriteStream writeStream; <span class="comment">// Use stream to insert the description</span>
<a name="l00298"></a>00298
<a name="l00299"></a>00299 TRAP(error,
<a name="l00300"></a>00300 view.InsertL(); <span class="comment">// Insert a row. Column order matches sql select statement</span>
<a name="l00301"></a>00301 view.SetColL(1, aAuthor);
<a name="l00302"></a>00302 view.SetColL(2, aTitle);
<a name="l00303"></a>00303 writeStream.OpenL(view, 3);
<a name="l00304"></a>00304 writeStream.WriteL(aDescription);
<a name="l00305"></a>00305
<a name="l00306"></a>00306 );
<a name="l00307"></a>00307 <span class="keywordflow">if</span>(error!=KErrNone)
<a name="l00308"></a>00308 {
<a name="l00309"></a>00309 <span class="keywordflow">return</span> error;
<a name="l00310"></a>00310 }
<a name="l00311"></a>00311 writeStream.Close();
<a name="l00312"></a>00312 TRAP(error, view.PutL()); <span class="comment">// Complete insertion</span>
<a name="l00313"></a>00313 <span class="keywordflow">if</span>(error!=KErrNone)
<a name="l00314"></a>00314 {
<a name="l00315"></a>00315 <span class="keywordflow">return</span> error;
<a name="l00316"></a>00316 }
<a name="l00317"></a>00317 view.Close();
<a name="l00318"></a>00318 <span class="keywordflow">return</span> KErrNone;
<a name="l00319"></a>00319 }
<a name="l00320"></a>00320
<a name="l00321"></a>00321 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00322"></a>00322 <span class="comment">// CBookDb::AddBookWithCppApiL()</span>
<a name="l00323"></a>00323 <span class="comment">//</span>
<a name="l00324"></a>00324 <span class="comment">// Add a book to database using RDbTable API</span>
<a name="l00325"></a>00325 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00326"></a><a class="code" href="class_c_book_db.html#aef6806bae5307151073caedaea88e81f">00326</a> TInt <a class="code" href="class_c_book_db.html#aef6806bae5307151073caedaea88e81f">CBookDb::AddBookWithCppApiL</a>(<span class="keyword">const</span> TDesC& aAuthor,
<a name="l00327"></a>00327 <span class="keyword">const</span> TDesC& aTitle,
<a name="l00328"></a>00328 <span class="keyword">const</span> TDesC& aDescription)
<a name="l00329"></a>00329 {
<a name="l00330"></a>00330
<a name="l00331"></a>00331 <span class="keywordflow">if</span>(aAuthor.Length()==0 || aTitle.Length()==0 || aDescription.Length()==0)
<a name="l00332"></a>00332 {
<a name="l00333"></a>00333 <span class="keywordflow">return</span> KErrGeneral;
<a name="l00334"></a>00334 }
<a name="l00335"></a>00335
<a name="l00336"></a>00336 <span class="comment">// Create an updateable database table object</span>
<a name="l00337"></a>00337 RDbTable table;
<a name="l00338"></a>00338 TInt err = table.Open(iBookDb, KBooksTable, table.EUpdatable);
<a name="l00339"></a>00339
<a name="l00340"></a>00340 <span class="keywordflow">if</span>(err!=KErrNone)
<a name="l00341"></a>00341 {
<a name="l00342"></a>00342 <span class="keywordflow">return</span> err;
<a name="l00343"></a>00343 }
<a name="l00344"></a>00344
<a name="l00345"></a>00345 CDbColSet* booksColSet = table.ColSetL();
<a name="l00346"></a>00346 CleanupStack::PushL(booksColSet);
<a name="l00347"></a>00347
<a name="l00348"></a>00348 table.Reset();
<a name="l00349"></a>00349 RDbColWriteStream writeStream;
<a name="l00350"></a>00350
<a name="l00351"></a>00351 TRAPD(error,
<a name="l00352"></a>00352 table.InsertL();
<a name="l00353"></a>00353 table.SetColL(booksColSet->ColNo(KBooksAuthorCol), aAuthor); <span class="comment">// col = 1</span>
<a name="l00354"></a>00354 table.SetColL(booksColSet->ColNo(KBooksTitleCol), aTitle); <span class="comment">// col = 2</span>
<a name="l00355"></a>00355 <span class="comment">// Use a stream for the long text column</span>
<a name="l00356"></a>00356 writeStream.OpenL(table, booksColSet->ColNo(KBooksDescriptionCol));
<a name="l00357"></a>00357 writeStream.WriteL(aDescription);
<a name="l00358"></a>00358 );
<a name="l00359"></a>00359
<a name="l00360"></a>00360 <span class="keywordflow">if</span>(error!=KErrNone)
<a name="l00361"></a>00361 {
<a name="l00362"></a>00362 <span class="keywordflow">return</span> error;
<a name="l00363"></a>00363 }
<a name="l00364"></a>00364 writeStream.Close();
<a name="l00365"></a>00365
<a name="l00366"></a>00366 TRAP(err, table.PutL()); <span class="comment">// Complete changes (the insertion)</span>
<a name="l00367"></a>00367 <span class="keywordflow">if</span>(err!=KErrNone)
<a name="l00368"></a>00368 {
<a name="l00369"></a>00369 <span class="keywordflow">return</span> err;
<a name="l00370"></a>00370 }
<a name="l00371"></a>00371
<a name="l00372"></a>00372 CleanupStack::PopAndDestroy(booksColSet);
<a name="l00373"></a>00373 table.Close();
<a name="l00374"></a>00374
<a name="l00375"></a>00375 <span class="keywordflow">return</span> KErrNone;
<a name="l00376"></a>00376
<a name="l00377"></a>00377 }
<a name="l00378"></a>00378
<a name="l00379"></a>00379 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00380"></a>00380 <span class="comment">// CBookDb::GetAllBooksL()</span>
<a name="l00381"></a>00381 <span class="comment">//</span>
<a name="l00382"></a>00382 <span class="comment">// Get array of all books in database. Format of each array item is:</span>
<a name="l00383"></a>00383 <span class="comment">// <Author>|<Title>|<Description></span>
<a name="l00384"></a>00384 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00385"></a><a class="code" href="class_c_book_db.html#a748adb83e450c321b2c9af57eaf029e4">00385</a> CDesCArrayFlat* <a class="code" href="class_c_book_db.html#a748adb83e450c321b2c9af57eaf029e4">CBookDb::GetAllBooksL</a>()
<a name="l00386"></a>00386 {
<a name="l00387"></a>00387 TPtrC author, title;
<a name="l00388"></a>00388 TBuf<KDescriptionMaxLength> description;
<a name="l00389"></a>00389 TBuf<KBookItemMaxLength> rowText;
<a name="l00390"></a>00390
<a name="l00391"></a>00391 RDbTable table;
<a name="l00392"></a>00392 TInt err = table.Open(iBookDb, KBooksTable, table.EReadOnly);
<a name="l00393"></a>00393 User::LeaveIfError(err);
<a name="l00394"></a>00394
<a name="l00395"></a>00395 CDesCArrayFlat* resultArray =
<a name="l00396"></a>00396 <span class="keyword">new</span> (ELeave)CDesC16ArrayFlat(KArrayGranularity);
<a name="l00397"></a>00397 CleanupStack::PushL(resultArray);
<a name="l00398"></a>00398
<a name="l00399"></a>00399 table.Reset();
<a name="l00400"></a>00400 CDbColSet* colSet = table.ColSetL();
<a name="l00401"></a>00401 CleanupStack::PushL(colSet);
<a name="l00402"></a>00402
<a name="l00403"></a>00403 <span class="keywordflow">for</span> (table.FirstL(); table.AtRow(); table.NextL())
<a name="l00404"></a>00404 {
<a name="l00405"></a>00405 description.Zero();
<a name="l00406"></a>00406 rowText.Zero();
<a name="l00407"></a>00407
<a name="l00408"></a>00408 table.GetL();
<a name="l00409"></a>00409
<a name="l00410"></a>00410 author.Set(table.ColDes(colSet->ColNo(KBooksAuthorCol)));
<a name="l00411"></a>00411 title.Set(table.ColDes(colSet->ColNo(KBooksTitleCol)));
<a name="l00412"></a>00412
<a name="l00413"></a>00413 TDbColNo descrColNo = colSet->ColNo(KBooksDescriptionCol);
<a name="l00414"></a>00414 RDbColReadStream readStream; <span class="comment">// A stream object for long columns</span>
<a name="l00415"></a>00415 readStream.OpenLC(table,descrColNo);
<a name="l00416"></a>00416 readStream.ReadL(description, table.ColLength(descrColNo));
<a name="l00417"></a>00417 readStream.Close();
<a name="l00418"></a>00418 CleanupStack::Pop(); <span class="comment">//readStream</span>
<a name="l00419"></a>00419
<a name="l00420"></a>00420 rowText.Append(author);
<a name="l00421"></a>00421 rowText.Append(KSeparator);
<a name="l00422"></a>00422 rowText.Append(title);
<a name="l00423"></a>00423 rowText.Append(KSeparator);
<a name="l00424"></a>00424 rowText.Append(description);
<a name="l00425"></a>00425
<a name="l00426"></a>00426 resultArray->AppendL(rowText); <span class="comment">// Copy rowText to resultArray</span>
<a name="l00427"></a>00427 }
<a name="l00428"></a>00428 CleanupStack::PopAndDestroy(colSet);
<a name="l00429"></a>00429 CleanupStack::Pop(resultArray);
<a name="l00430"></a>00430 table.Close();
<a name="l00431"></a>00431
<a name="l00432"></a>00432 <span class="keywordflow">return</span> resultArray;
<a name="l00433"></a>00433 }
<a name="l00434"></a>00434
<a name="l00435"></a>00435 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00436"></a>00436 <span class="comment">// CBookDb::GetABookFast()</span>
<a name="l00437"></a>00437 <span class="comment">//</span>
<a name="l00438"></a>00438 <span class="comment">// Get a book using index. Format of the result is:</span>
<a name="l00439"></a>00439 <span class="comment">// <Author>|<Title>|<Description></span>
<a name="l00440"></a>00440 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00441"></a><a class="code" href="class_c_book_db.html#a3f4fd01c0f549c6c564955f2faa6ee62">00441</a> TInt <a class="code" href="class_c_book_db.html#a3f4fd01c0f549c6c564955f2faa6ee62">CBookDb::GetABookFast</a>(<span class="keyword">const</span> TDesC& aTitle, TDes& aResult)
<a name="l00442"></a>00442 {
<a name="l00443"></a>00443 TInt err = KErrNone;
<a name="l00444"></a>00444 TBuf<KDescriptionMaxLength> description; <span class="comment">// Only 128 first characters read</span>
<a name="l00445"></a>00445 RDbTable rowset;
<a name="l00446"></a>00446
<a name="l00447"></a>00447 TDbSeekKey seekKey(aTitle); <span class="comment">// Initialize one-column seek key</span>
<a name="l00448"></a>00448
<a name="l00449"></a>00449 <span class="comment">// Open view to "Books" table. Use index to browse the table.</span>
<a name="l00450"></a>00450 err = rowset.Open(iBookDb, KBooksTable, rowset.EReadOnly);
<a name="l00451"></a>00451 <span class="keywordflow">if</span>(err!=KErrNone)
<a name="l00452"></a>00452 {
<a name="l00453"></a>00453 <span class="keywordflow">return</span> err;
<a name="l00454"></a>00454 }
<a name="l00455"></a>00455 err = rowset.SetIndex(KBooksIndexName);
<a name="l00456"></a>00456 <span class="keywordflow">if</span>(err!=KErrNone)
<a name="l00457"></a>00457 {
<a name="l00458"></a>00458 <span class="keywordflow">return</span> err;
<a name="l00459"></a>00459 }
<a name="l00460"></a>00460 <span class="comment">// Query colum numbers for author, title, and description</span>
<a name="l00461"></a>00461 CDbColSet* colSet=NULL;
<a name="l00462"></a>00462 TRAP(err, colSet = rowset.ColSetL());
<a name="l00463"></a>00463 <span class="keywordflow">if</span>(err!=KErrNone)
<a name="l00464"></a>00464 {
<a name="l00465"></a>00465 <span class="keywordflow">return</span> err;
<a name="l00466"></a>00466 }
<a name="l00467"></a>00467
<a name="l00468"></a>00468 TInt authorColumnNo = colSet->ColNo(KBooksAuthorCol);
<a name="l00469"></a>00469 TInt titleColumnNo = colSet->ColNo(KBooksTitleCol);
<a name="l00470"></a>00470 TInt descrColumnNo = colSet->ColNo(KBooksDescriptionCol);
<a name="l00471"></a>00471
<a name="l00472"></a>00472 <span class="comment">// Search the index for aTitle</span>
<a name="l00473"></a>00473 TBool isTitle = <span class="keyword">false</span>;
<a name="l00474"></a>00474 TRAP(err, isTitle = rowset.SeekL(seekKey));
<a name="l00475"></a>00475 <span class="keywordflow">if</span>(isTitle)
<a name="l00476"></a>00476 {
<a name="l00477"></a>00477 RDbColReadStream readStream; <span class="comment">// A stream object for long columns</span>
<a name="l00478"></a>00478 TRAPD(error,
<a name="l00479"></a>00479 rowset.GetL();
<a name="l00480"></a>00480 readStream.OpenL(rowset,descrColumnNo);
<a name="l00481"></a>00481 readStream.ReadL(description, rowset.ColLength(descrColumnNo));
<a name="l00482"></a>00482 );
<a name="l00483"></a>00483 <span class="keywordflow">if</span>(error!=KErrNone)
<a name="l00484"></a>00484 {
<a name="l00485"></a>00485 <span class="keywordflow">return</span> error;
<a name="l00486"></a>00486 }
<a name="l00487"></a>00487
<a name="l00488"></a>00488 readStream.Close();
<a name="l00489"></a>00489
<a name="l00490"></a>00490 aResult.Zero();
<a name="l00491"></a>00491 aResult.Append(rowset.ColDes(authorColumnNo));
<a name="l00492"></a>00492 aResult.Append(KSeparator);
<a name="l00493"></a>00493 aResult.Append(rowset.ColDes(titleColumnNo));
<a name="l00494"></a>00494 aResult.Append(KSeparator);
<a name="l00495"></a>00495 aResult.Append(description);
<a name="l00496"></a>00496
<a name="l00497"></a>00497 err = KErrNone;
<a name="l00498"></a>00498 }
<a name="l00499"></a>00499 <span class="keywordflow">else</span>
<a name="l00500"></a>00500 {
<a name="l00501"></a>00501 err = KErrNotFound;
<a name="l00502"></a>00502 }
<a name="l00503"></a>00503
<a name="l00504"></a>00504 rowset.Close();
<a name="l00505"></a>00505 <span class="keywordflow">return</span> err;
<a name="l00506"></a>00506 }
<a name="l00507"></a>00507
<a name="l00508"></a>00508 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00509"></a>00509 <span class="comment">// CBookDb::GetBooksByKeyL()</span>
<a name="l00510"></a>00510 <span class="comment">//</span>
<a name="l00511"></a>00511 <span class="comment">// Get array of books from database according to column name and a search</span>
<a name="l00512"></a>00512 <span class="comment">// pattern. Format of each array item is:</span>
<a name="l00513"></a>00513 <span class="comment">// <Author>|<Title>|<Description></span>
<a name="l00514"></a>00514 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00515"></a><a class="code" href="class_c_book_db.html#a6b153d0c0eb9d365b1163ec1301be78e">00515</a> CDesCArrayFlat* <a class="code" href="class_c_book_db.html#a6b153d0c0eb9d365b1163ec1301be78e">CBookDb::GetBooksByKeyL</a>(<span class="keyword">const</span> TDesC& aColumnName,
<a name="l00516"></a>00516 <span class="keyword">const</span> TDesC& aSearchString)
<a name="l00517"></a>00517 {
<a name="l00518"></a>00518
<a name="l00519"></a>00519 TPtrC author, title;
<a name="l00520"></a>00520 TBuf<KDescriptionMaxLength> description;
<a name="l00521"></a>00521 TBuf<KBookItemMaxLength> rowText;
<a name="l00522"></a>00522
<a name="l00523"></a>00523 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSelect, <span class="stringliteral">"SELECT "</span>);
<a name="l00524"></a>00524 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFrom, <span class="stringliteral">" FROM "</span>);
<a name="l00525"></a>00525 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KWhere, <span class="stringliteral">" WHERE "</span>);
<a name="l00526"></a>00526 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KLike, <span class="stringliteral">" LIKE '"</span>);
<a name="l00527"></a>00527 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KOrderBy, <span class="stringliteral">"' ORDER BY "</span>);
<a name="l00528"></a>00528 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KDot, <span class="stringliteral">", "</span>);
<a name="l00529"></a>00529
<a name="l00530"></a>00530 <span class="comment">// Sql: SELECT Author, Title, Description FROM Books</span>
<a name="l00531"></a>00531 <span class="comment">// WHERE "aColumnName LIKE aSearchString"</span>
<a name="l00532"></a>00532 <span class="comment">// ORDER BY Title, Author</span>
<a name="l00533"></a>00533 TBuf<KCustomSqlMaxLength> sqlStr;
<a name="l00534"></a>00534 sqlStr.Append(KSelect);
<a name="l00535"></a>00535 sqlStr.Append(KBooksAuthorCol);
<a name="l00536"></a>00536 sqlStr.Append(KDot);
<a name="l00537"></a>00537 sqlStr.Append(KBooksTitleCol);
<a name="l00538"></a>00538 sqlStr.Append(KDot);
<a name="l00539"></a>00539 sqlStr.Append(KBooksDescriptionCol);
<a name="l00540"></a>00540 sqlStr.Append(KFrom);
<a name="l00541"></a>00541 sqlStr.Append(KBooksTable);
<a name="l00542"></a>00542 sqlStr.Append(KWhere);
<a name="l00543"></a>00543 sqlStr.Append(aColumnName);
<a name="l00544"></a>00544 sqlStr.Append(KLike);
<a name="l00545"></a>00545 sqlStr.Append(aSearchString);
<a name="l00546"></a>00546 sqlStr.Append(KOrderBy);
<a name="l00547"></a>00547 sqlStr.Append(KBooksTitleCol);
<a name="l00548"></a>00548 sqlStr.Append(KDot);
<a name="l00549"></a>00549 sqlStr.Append(KBooksAuthorCol);
<a name="l00550"></a>00550
<a name="l00551"></a>00551 CDesCArrayFlat* resultArray =
<a name="l00552"></a>00552 <span class="keyword">new</span> (ELeave)CDesC16ArrayFlat(KArrayGranularity);
<a name="l00553"></a>00553 CleanupStack::PushL(resultArray);
<a name="l00554"></a>00554
<a name="l00555"></a>00555 <span class="comment">// Create a view on the database</span>
<a name="l00556"></a>00556 RDbView view;
<a name="l00557"></a>00557 User::LeaveIfError(
<a name="l00558"></a>00558 view.Prepare(iBookDb, TDbQuery(sqlStr), view.EReadOnly));
<a name="l00559"></a>00559 User::LeaveIfError(view.EvaluateAll());
<a name="l00560"></a>00560
<a name="l00561"></a>00561 CDbColSet* colSet = view.ColSetL();
<a name="l00562"></a>00562 CleanupStack::PushL(colSet);
<a name="l00563"></a>00563
<a name="l00564"></a>00564 <span class="comment">// Append each result row to array</span>
<a name="l00565"></a>00565 <span class="keywordflow">for</span> (view.FirstL(); view.AtRow(); view.NextL())
<a name="l00566"></a>00566 {
<a name="l00567"></a>00567
<a name="l00568"></a>00568 description.Zero();
<a name="l00569"></a>00569 rowText.Zero();
<a name="l00570"></a>00570
<a name="l00571"></a>00571 view.GetL();
<a name="l00572"></a>00572
<a name="l00573"></a>00573 author.Set(view.ColDes(colSet->ColNo(KBooksAuthorCol)));
<a name="l00574"></a>00574 title.Set(view.ColDes(colSet->ColNo(KBooksTitleCol)));
<a name="l00575"></a>00575
<a name="l00576"></a>00576 TDbColNo descrColNo = colSet->ColNo(KBooksDescriptionCol);
<a name="l00577"></a>00577 RDbColReadStream readStream; <span class="comment">// A stream object for long columns</span>
<a name="l00578"></a>00578 readStream.OpenLC(view, descrColNo);
<a name="l00579"></a>00579 readStream.ReadL(description, view.ColLength(descrColNo));
<a name="l00580"></a>00580 readStream.Close();
<a name="l00581"></a>00581 CleanupStack::Pop(); <span class="comment">//readStream</span>
<a name="l00582"></a>00582
<a name="l00583"></a>00583 rowText.Append(author);
<a name="l00584"></a>00584 rowText.Append(KSeparator);
<a name="l00585"></a>00585 rowText.Append(title);
<a name="l00586"></a>00586 rowText.Append(KSeparator);
<a name="l00587"></a>00587 rowText.Append(description);
<a name="l00588"></a>00588
<a name="l00589"></a>00589 resultArray->AppendL(rowText);
<a name="l00590"></a>00590 }
<a name="l00591"></a>00591 CleanupStack::PopAndDestroy(colSet);
<a name="l00592"></a>00592 view.Close();
<a name="l00593"></a>00593 CleanupStack::Pop(resultArray);
<a name="l00594"></a>00594
<a name="l00595"></a>00595 <span class="keywordflow">return</span> resultArray;
<a name="l00596"></a>00596
<a name="l00597"></a>00597 }
<a name="l00598"></a>00598
<a name="l00599"></a>00599 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00600"></a>00600 <span class="comment">// CBookDb::RemoveBooks()</span>
<a name="l00601"></a>00601 <span class="comment">//</span>
<a name="l00602"></a>00602 <span class="comment">// Delete a book using title pattern and RDbUpdate (DML)</span>
<a name="l00603"></a>00603 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00604"></a><a class="code" href="class_c_book_db.html#ac4a202bf6ebb76155ef0dc65ece5a386">00604</a> TInt <a class="code" href="class_c_book_db.html#ac4a202bf6ebb76155ef0dc65ece5a386">CBookDb::RemoveBooks</a>(<span class="keyword">const</span> TDesC& aTitle, TInt& aResultCount)
<a name="l00605"></a>00605 {
<a name="l00606"></a>00606 RDbUpdate updOp;
<a name="l00607"></a>00607
<a name="l00608"></a>00608 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KDeleteFrom, <span class="stringliteral">"DELETE FROM "</span>);
<a name="l00609"></a>00609 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KWhere, <span class="stringliteral">" WHERE "</span>);
<a name="l00610"></a>00610 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KLike, <span class="stringliteral">" LIKE '"</span>);
<a name="l00611"></a>00611 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KDot, <span class="stringliteral">"'"</span>);
<a name="l00612"></a>00612
<a name="l00613"></a>00613 <span class="comment">// Sql: DELETE FROM Books WHERE Title LIKE 'aTitle'</span>
<a name="l00614"></a>00614 TBuf<KCustomSqlMaxLength> sqlStr;
<a name="l00615"></a>00615 sqlStr.Append(KDeleteFrom);
<a name="l00616"></a>00616 sqlStr.Append(KBooksTable);
<a name="l00617"></a>00617 sqlStr.Append(KWhere);
<a name="l00618"></a>00618 sqlStr.Append(KBooksTitleCol);
<a name="l00619"></a>00619 sqlStr.Append(KLike);
<a name="l00620"></a>00620 sqlStr.Append(aTitle);
<a name="l00621"></a>00621 sqlStr.Append(KDot);
<a name="l00622"></a>00622
<a name="l00623"></a>00623 <span class="comment">// Initialize execution and perform the first step.</span>
<a name="l00624"></a>00624 <span class="comment">// Note: Execute() returns 0 (=KErrNone), but it does not affect database</span>
<a name="l00625"></a>00625 <span class="comment">// until Next() is called.</span>
<a name="l00626"></a>00626 TInt incStat = updOp.Execute(iBookDb, sqlStr, EDbCompareFolded);
<a name="l00627"></a>00627 incStat = updOp.Next(); <span class="comment">// This will leave, if Execute() failed.</span>
<a name="l00628"></a>00628
<a name="l00629"></a>00629 <span class="keywordflow">while</span>( incStat == 1 ) <span class="comment">// Just in case, if the operation has more steps</span>
<a name="l00630"></a>00630 {
<a name="l00631"></a>00631 incStat = updOp.Next();
<a name="l00632"></a>00632 }
<a name="l00633"></a>00633 aResultCount = updOp.RowCount();
<a name="l00634"></a>00634 updOp.Close();
<a name="l00635"></a>00635 <span class="keywordflow">return</span> incStat; <span class="comment">// KErrNone or system wide error code</span>
<a name="l00636"></a>00636 }
<a name="l00637"></a>00637
<a name="l00638"></a>00638 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00639"></a>00639 <span class="comment">// CBookDb::RemoveAllBooks()</span>
<a name="l00640"></a>00640 <span class="comment">//</span>
<a name="l00641"></a>00641 <span class="comment">// Delete books using asynchronous API. (RDbUpdate and DML)</span>
<a name="l00642"></a>00642 <span class="comment">// This implementation is still synchronous, because it uses</span>
<a name="l00643"></a>00643 <span class="comment">// User::WaitForRequest. Normally asynchronous functionality should be hidden</span>
<a name="l00644"></a>00644 <span class="comment">// into active object and client callback interfaces.</span>
<a name="l00645"></a>00645 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00646"></a><a class="code" href="class_c_book_db.html#a96f6946ac8885c20f831300cbf0d55b0">00646</a> TInt <a class="code" href="class_c_book_db.html#a96f6946ac8885c20f831300cbf0d55b0">CBookDb::RemoveAllBooks</a>(TInt& aResultCount)
<a name="l00647"></a>00647 {
<a name="l00648"></a>00648 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KDeleteFrom, <span class="stringliteral">"DELETE FROM "</span>);
<a name="l00649"></a>00649
<a name="l00650"></a>00650 <span class="comment">// Sql: DELETE FROM Books</span>
<a name="l00651"></a>00651 TBuf<KCustomSqlMaxLength> sqlStr;
<a name="l00652"></a>00652 sqlStr.Append(KDeleteFrom);
<a name="l00653"></a>00653 sqlStr.Append(KBooksTable);
<a name="l00654"></a>00654
<a name="l00655"></a>00655 RDbUpdate updOp;
<a name="l00656"></a>00656 TRequestStatus incStat(1);
<a name="l00657"></a>00657 TInt updStat = updOp.Execute(iBookDb, sqlStr, EDbCompareFolded);
<a name="l00658"></a>00658 <span class="keywordflow">while</span> (updStat==KErrNone && incStat ==1)
<a name="l00659"></a>00659 {
<a name="l00660"></a>00660 updOp.Next(incStat); <span class="comment">// Start async operation. It returns</span>
<a name="l00661"></a>00661 <span class="comment">// immediately.</span>
<a name="l00662"></a>00662 User::WaitForRequest(incStat); <span class="comment">// For simplicity wait completion here.</span>
<a name="l00663"></a>00663 }
<a name="l00664"></a>00664
<a name="l00665"></a>00665 aResultCount = updOp.RowCount();
<a name="l00666"></a>00666 updOp.Close();
<a name="l00667"></a>00667
<a name="l00668"></a>00668 <span class="keywordflow">if</span>(updStat!=KErrNone)
<a name="l00669"></a>00669 <span class="keywordflow">return</span> updStat; <span class="comment">// System wide error code</span>
<a name="l00670"></a>00670 <span class="keywordflow">else</span>
<a name="l00671"></a>00671 <span class="keywordflow">return</span> incStat.Int(); <span class="comment">// KErrNone or system wide error code</span>
<a name="l00672"></a>00672 }
<a name="l00673"></a>00673
<a name="l00674"></a>00674
<a name="l00675"></a>00675 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00676"></a>00676 <span class="comment">// CBookDb::UpdateBookTitle()</span>
<a name="l00677"></a>00677 <span class="comment">//</span>
<a name="l00678"></a>00678 <span class="comment">// Update book title using SQL UPDATE.</span>
<a name="l00679"></a>00679 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00680"></a>00680 <span class="comment">//</span>
<a name="l00681"></a><a class="code" href="class_c_book_db.html#a558090a1a44e419fd420f7113e80b310">00681</a> TInt <a class="code" href="class_c_book_db.html#a558090a1a44e419fd420f7113e80b310">CBookDb::UpdateBookTitle</a>(<span class="keyword">const</span> TDesC& aOldTitleKey,
<a name="l00682"></a>00682 <span class="keyword">const</span> TDesC& aNewTitle)
<a name="l00683"></a>00683 {
<a name="l00684"></a>00684 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSQLUpdateStart, <span class="stringliteral">"UPDATE Books SET Title = '"</span>);
<a name="l00685"></a>00685 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSQLUpdateMiddle, <span class="stringliteral">"' WHERE Title = '"</span>);
<a name="l00686"></a>00686 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSQLUpdateEnd, <span class="stringliteral">"'"</span>);
<a name="l00687"></a>00687
<a name="l00688"></a>00688 TBuf<KCustomSqlMaxLength> sqlStr;
<a name="l00689"></a>00689 sqlStr.Append(KSQLUpdateStart);
<a name="l00690"></a>00690 sqlStr.Append(aNewTitle);
<a name="l00691"></a>00691 sqlStr.Append(KSQLUpdateMiddle);
<a name="l00692"></a>00692 sqlStr.Append(aOldTitleKey);
<a name="l00693"></a>00693 sqlStr.Append(KSQLUpdateEnd);
<a name="l00694"></a>00694
<a name="l00695"></a>00695 <span class="keywordflow">return</span> iBookDb.Execute(sqlStr);
<a name="l00696"></a>00696 }
<a name="l00697"></a>00697
<a name="l00698"></a>00698
<a name="l00699"></a>00699 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00700"></a>00700 <span class="comment">// CBookDb::ColumnNamesAndSizesL()</span>
<a name="l00701"></a>00701 <span class="comment">//</span>
<a name="l00702"></a>00702 <span class="comment">// Get array of column names and sizes of the Books table.</span>
<a name="l00703"></a>00703 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00704"></a><a class="code" href="class_c_book_db.html#a5f13ae296de4d79beed916a416e67530">00704</a> CDesCArrayFlat* <a class="code" href="class_c_book_db.html#a5f13ae296de4d79beed916a416e67530">CBookDb::ColumnNamesAndSizesL</a>()
<a name="l00705"></a>00705 {
<a name="l00706"></a>00706 RDbTable booksTable;
<a name="l00707"></a>00707 TBuf<32> columnNameAndSize;
<a name="l00708"></a>00708 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KDelimiter, <span class="stringliteral">": "</span>);
<a name="l00709"></a>00709 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KNoSize,<span class="stringliteral">"No size"</span>);
<a name="l00710"></a>00710
<a name="l00711"></a>00711 <span class="comment">// Open the Books table.</span>
<a name="l00712"></a>00712 TInt err = booksTable.Open(iBookDb, KBooksTable, booksTable.EReadOnly);
<a name="l00713"></a>00713 User::LeaveIfError(err);
<a name="l00714"></a>00714
<a name="l00715"></a>00715 CleanupClosePushL(booksTable); <span class="comment">// Remember to pop and close</span>
<a name="l00716"></a>00716
<a name="l00717"></a>00717 CDesCArrayFlat* resultArray =
<a name="l00718"></a>00718 <span class="keyword">new</span> (ELeave)CDesC16ArrayFlat(KArrayGranularity);
<a name="l00719"></a>00719 CleanupStack::PushL(resultArray);
<a name="l00720"></a>00720
<a name="l00721"></a>00721 <span class="comment">// Iterate through the colums of Books table. Extract the column name and</span>
<a name="l00722"></a>00722 <span class="comment">// column size (size only for text columns).´</span>
<a name="l00723"></a>00723 <span class="comment">// Note: Description column is long text. Database limits its size</span>
<a name="l00724"></a>00724 <span class="comment">// only by hardware. If size is queried, it is -1</span>
<a name="l00725"></a>00725 CDbColSet* colSet = booksTable.ColSetL();
<a name="l00726"></a>00726 CleanupStack::PushL(colSet);
<a name="l00727"></a>00727 TDbColSetIter colIter(*colSet);
<a name="l00728"></a>00728 <span class="keywordflow">while</span>(colIter)
<a name="l00729"></a>00729 {
<a name="l00730"></a>00730 columnNameAndSize.Zero();
<a name="l00731"></a>00731 columnNameAndSize.Append(colIter->iName);
<a name="l00732"></a>00732 columnNameAndSize.Append(KDelimiter);
<a name="l00733"></a>00733 <span class="keywordflow">if</span>(colIter->iType == EDbColText)
<a name="l00734"></a>00734 columnNameAndSize.AppendNum(colIter->iMaxLength);
<a name="l00735"></a>00735 <span class="keywordflow">else</span>
<a name="l00736"></a>00736 columnNameAndSize.Append(KNoSize);
<a name="l00737"></a>00737 resultArray->AppendL(columnNameAndSize);
<a name="l00738"></a>00738 colIter++;
<a name="l00739"></a>00739 }
<a name="l00740"></a>00740 CleanupStack::PopAndDestroy(colSet);
<a name="l00741"></a>00741 CleanupStack::Pop(resultArray);
<a name="l00742"></a>00742
<a name="l00743"></a>00743 <span class="comment">// Pop the booksTable from cleanup stack and close it.</span>
<a name="l00744"></a>00744 CleanupStack::PopAndDestroy();
<a name="l00745"></a>00745
<a name="l00746"></a>00746 <span class="keywordflow">return</span> resultArray;
<a name="l00747"></a>00747 }
<a name="l00748"></a>00748
<a name="l00749"></a>00749 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00750"></a>00750 <span class="comment">// CBookDb::HasDateColumnL()</span>
<a name="l00751"></a>00751 <span class="comment">//</span>
<a name="l00752"></a>00752 <span class="comment">// Tests wheter the Books table has date column</span>
<a name="l00753"></a>00753 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00754"></a><a class="code" href="class_c_book_db.html#a60d34d3250835e8341808b33d09733bc">00754</a> TInt <a class="code" href="class_c_book_db.html#a60d34d3250835e8341808b33d09733bc">CBookDb::HasDateColumn</a>(TBool& aReturnValue)
<a name="l00755"></a>00755 {
<a name="l00756"></a>00756 RDbTable booksTable;
<a name="l00757"></a>00757 aReturnValue = EFalse;
<a name="l00758"></a>00758
<a name="l00759"></a>00759 <span class="comment">// Open the Books table.</span>
<a name="l00760"></a>00760 TInt err = booksTable.Open(iBookDb, KBooksTable, booksTable.EReadOnly);
<a name="l00761"></a>00761 <span class="keywordflow">if</span>(err!=KErrNone)
<a name="l00762"></a>00762 {
<a name="l00763"></a>00763 <span class="keywordflow">return</span> err;
<a name="l00764"></a>00764 }
<a name="l00765"></a>00765
<a name="l00766"></a>00766 <span class="comment">// Iterate through the colums of Books table. Check whether there is</span>
<a name="l00767"></a>00767 <span class="comment">// a 'PublishDate' column</span>
<a name="l00768"></a>00768 CDbColSet* colSet=NULL;
<a name="l00769"></a>00769 TRAP(err, colSet = booksTable.ColSetL());
<a name="l00770"></a>00770 <span class="keywordflow">if</span>(err!=KErrNone)
<a name="l00771"></a>00771 {
<a name="l00772"></a>00772 <span class="keywordflow">return</span> err;
<a name="l00773"></a>00773 }
<a name="l00774"></a>00774
<a name="l00775"></a>00775 TDbColSetIter colIter(*colSet);
<a name="l00776"></a>00776 <span class="keywordflow">while</span>(colIter)
<a name="l00777"></a>00777 {
<a name="l00778"></a>00778 <span class="keywordflow">if</span>( (colIter->iName).Compare(KBooksDateCol) == 0) <span class="comment">// 0 = equal</span>
<a name="l00779"></a>00779 {
<a name="l00780"></a>00780 aReturnValue = ETrue;
<a name="l00781"></a>00781 <span class="keywordflow">break</span>;
<a name="l00782"></a>00782 }
<a name="l00783"></a>00783 colIter++;
<a name="l00784"></a>00784 }
<a name="l00785"></a>00785
<a name="l00786"></a>00786 <span class="keywordflow">return</span> KErrNone;
<a name="l00787"></a>00787 }
<a name="l00788"></a>00788
<a name="l00789"></a>00789 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00790"></a>00790 <span class="comment">// CBookDb::AddDateColumn()</span>
<a name="l00791"></a>00791 <span class="comment">//</span>
<a name="l00792"></a>00792 <span class="comment">// Adds date column to Books table (DDL).</span>
<a name="l00793"></a>00793 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00794"></a><a class="code" href="class_c_book_db.html#a72ca4025b97842c2e743b93cbf2b013a">00794</a> TInt <a class="code" href="class_c_book_db.html#a72ca4025b97842c2e743b93cbf2b013a">CBookDb::AddDateColumn</a>()
<a name="l00795"></a>00795 {
<a name="l00796"></a>00796 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSqlAddDate, <span class="stringliteral">"ALTER TABLE Books ADD PublishDate DATE"</span>);
<a name="l00797"></a>00797 <span class="keywordflow">return</span> iBookDb.Execute(KSqlAddDate);
<a name="l00798"></a>00798 }
<a name="l00799"></a>00799
<a name="l00800"></a>00800 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00801"></a>00801 <span class="comment">// CBookDb::RemoveDateColumn()</span>
<a name="l00802"></a>00802 <span class="comment">//</span>
<a name="l00803"></a>00803 <span class="comment">// Removes date column from Books table (DDL).</span>
<a name="l00804"></a>00804 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00805"></a><a class="code" href="class_c_book_db.html#a470d106d843cea950d8c5bb8ccfeb122">00805</a> TInt <a class="code" href="class_c_book_db.html#a470d106d843cea950d8c5bb8ccfeb122">CBookDb::RemoveDateColumn</a>()
<a name="l00806"></a>00806 {
<a name="l00807"></a>00807 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSqlRemoveDate, <span class="stringliteral">"ALTER TABLE Books DROP PublishDate"</span>);
<a name="l00808"></a>00808 <span class="keywordflow">return</span> iBookDb.Execute(KSqlRemoveDate);
<a name="l00809"></a>00809 }
<a name="l00810"></a>00810
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