Allow opening databases in read only mode

See issue #325.

src/MainWindow.cpp

@@ -263,7 +263,7 @@ void MainWindow::init()
     ui->dockSchema->setWindowTitle(ui->dockSchema->windowTitle().remove('&'));
 }
 
-bool MainWindow::fileOpen(const QString& fileName, bool dontAddToRecentFiles)
+bool MainWindow::fileOpen(const QString& fileName, bool dontAddToRecentFiles, bool readOnly)
 {
     bool retval = false;
 
@@ -286,12 +286,12 @@ bool MainWindow::fileOpen(const QString& fileName, bool dontAddToRecentFiles)
                 return false;
 
         // Try opening it as a project file first
-        if(loadProject(wFile))
+        if(loadProject(wFile, readOnly))
         {
             retval = true;
         } else {
             // No project file; so it should be a database file
-            if(db.open(wFile))
+            if(db.open(wFile, readOnly))
             {
                 statusEncodingLabel->setText(db.getPragma("encoding"));
                 statusEncryptionLabel->setVisible(db.encrypted());
@@ -2249,7 +2249,7 @@ void MainWindow::updateBrowseDataColumnWidth(int section, int /*old_size*/, int
     }
 }
 
-bool MainWindow::loadProject(QString filename)
+bool MainWindow::loadProject(QString filename, bool readOnly)
 {
     // Show the open file dialog when no filename was passed as parameter
     if(filename.isEmpty())
@@ -2286,7 +2286,7 @@ bool MainWindow::loadProject(QString filename)
                     QString dbfilename = xml.attributes().value("path").toString();
                     if(!QFile::exists(dbfilename))
                         dbfilename = QFileInfo(filename).absolutePath() + QDir::separator() + dbfilename;
-                    fileOpen(dbfilename, true);
+                    fileOpen(dbfilename, true, readOnly);
                     ui->dbTreeWidget->collapseAll();
                 } else if(xml.name() == "window") {
                     // Window settings
@@ -2828,3 +2828,9 @@ void MainWindow::browseDataFetchAllData()
         updatePlot(m_currentPlotModel);
     }
 }
+
+void MainWindow::fileOpenReadOnly()
+{
+    // Redirect to 'standard' fileOpen(), with the read only flag set
+    fileOpen(QString(), false, true);
+}

src/MainWindow.h

@@ -196,7 +196,7 @@ protected:
     void keyPressEvent(QKeyEvent* event);
 
 public slots:
-    bool fileOpen(const QString& fileName = QString(), bool dontAddToRecentFiles = false);
+    bool fileOpen(const QString& fileName = QString(), bool dontAddToRecentFiles = false, bool readOnly = false);
     void logSql(const QString &sql, int msgtype);
     void dbState(bool dirty);
     void refresh();
@@ -265,7 +265,7 @@ private slots:
     void on_actionSqlCipherFaq_triggered();
     void on_actionWebsite_triggered();
     void updateBrowseDataColumnWidth(int section, int /*old_size*/, int new_size);
-    bool loadProject(QString filename = QString());
+    bool loadProject(QString filename = QString(), bool readOnly = false);
     void saveProject();
     void fileAttach();
     void updateFilter(int column, const QString& value);
@@ -281,6 +281,7 @@ private slots:
     void browseDataSetTableEncoding(bool forAllTables = false);
     void browseDataSetDefaultTableEncoding();
     void browseDataFetchAllData();
+    void fileOpenReadOnly();
 };
 
 #endif

src/MainWindow.ui

@@ -873,6 +873,7 @@
     </widget>
     <addaction name="fileNewAction"/>
     <addaction name="fileOpenAction"/>
+    <addaction name="fileOpenReadOnlyAction"/>
     <addaction name="fileAttachAction"/>
     <addaction name="fileCloseAction"/>
     <addaction name="separator"/>
@@ -1993,6 +1994,27 @@
     <string>F5</string>
    </property>
   </action>
+  <action name="fileOpenReadOnlyAction">
+   <property name="icon">
+    <iconset resource="icons/icons.qrc">
+     <normaloff>:/icons/db_open</normaloff>:/icons/db_open</iconset>
+   </property>
+   <property name="text">
+    <string>&amp;Open Database Read Only...</string>
+   </property>
+   <property name="toolTip">
+    <string>Open an existing database file in read only mode</string>
+   </property>
+   <property name="statusTip">
+    <string>Open an existing database file</string>
+   </property>
+   <property name="whatsThis">
+    <string>This option is used to open an existing database file.</string>
+   </property>
+   <property name="menuRole">
+    <enum>QAction::NoRole</enum>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>
@@ -3039,6 +3061,22 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>fileOpenReadOnlyAction</sender>
+   <signal>triggered()</signal>
+   <receiver>MainWindow</receiver>
+   <slot>fileOpenReadOnly()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>-1</x>
+     <y>-1</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>518</x>
+     <y>314</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
  <slots>
   <slot>fileOpen()</slot>
@@ -3101,5 +3139,6 @@
   <slot>browseDataSetDefaultTableEncoding()</slot>
   <slot>browseDataFetchAllData()</slot>
   <slot>exportTableToJson()</slot>
+  <slot>fileOpenReadOnly()</slot>
  </slots>
 </ui>

src/sqlitedb.cpp

@@ -83,7 +83,7 @@ bool DBBrowserDB::getDirty() const
     return !savepointList.empty();
 }
 
-bool DBBrowserDB::open(const QString& db)
+bool DBBrowserDB::open(const QString& db, bool readOnly)
 {
     if (isOpen()) close();
 
@@ -99,7 +99,7 @@ bool DBBrowserDB::open(const QString& db)
     }
 
     // Open database file
-    if(sqlite3_open_v2(db.toUtf8(), &_db, SQLITE_OPEN_READWRITE, NULL) != SQLITE_OK)
+    if(sqlite3_open_v2(db.toUtf8(), &_db, readOnly ? SQLITE_OPEN_READONLY : SQLITE_OPEN_READWRITE, NULL) != SQLITE_OK)
     {
         lastErrorMessage = QString::fromUtf8((const char*)sqlite3_errmsg(_db));
         return false;
@@ -140,7 +140,7 @@ bool DBBrowserDB::open(const QString& db)
         // Check if file is read only
         QFileInfo fi(db);
         QFileInfo fid(fi.absoluteDir().absolutePath());
-        isReadOnly = !fi.isWritable() || !fid.isWritable();
+        isReadOnly = readOnly || !fi.isWritable() || !fid.isWritable();
 
         // Execute default SQL
         if(!isReadOnly)

src/sqlitedb.h

@@ -45,7 +45,7 @@ class DBBrowserDB : public QObject
 public:
     explicit DBBrowserDB () : _db(0), isEncrypted(false), isReadOnly(false), dontCheckForStructureUpdates(false) {}
     virtual ~DBBrowserDB (){}
-    bool open ( const QString & db);
+    bool open(const QString& db, bool readOnly = false);
     bool attach(const QString& filename, QString attach_as = "");
     bool create ( const QString & db);
     bool close();