Save current filter, sort column and display formats as a new view

A new button is added to the Browse Data tab for saving the current display
of the table (current filter, sort column and display formats) as a new
view. This allows (specially for non advanced users) the creation of simple
views. It can be seen, either as a way of storing the current
filtering or as an easy way of creating views.

This reuses the query set in sqlitetablemodel, but the column aliases when
a display format is used has been changed from col%1 to the original column
names, i.e. format(`orig`) AS `orig`.

src/MainWindow.cpp

@@ -1861,7 +1861,7 @@ void MainWindow::saveSqlResultsAsCsv()
 
 void MainWindow::saveSqlResultsAsView()
 {
-    qobject_cast<SqlExecutionArea*>(ui->tabSqlAreas->currentWidget())->saveAsView();
+    saveAsView(qobject_cast<SqlExecutionArea*>(ui->tabSqlAreas->currentWidget())->getModel()->query());
 }
 
 void MainWindow::loadExtension()
@@ -2719,3 +2719,36 @@ void MainWindow::openFindReplaceDialog()
         findReplaceDialog->show();
     }
 }
+
+void MainWindow::saveAsView(QString query)
+{
+    // Let the user select a name for the new view and make sure it doesn't already exist
+    QString name;
+    while(true)
+    {
+        name = QInputDialog::getText(this, qApp->applicationName(), tr("Please specify the view name")).trimmed();
+        if(name.isEmpty())
+            return;
+        if(db.getObjectByName(sqlb::ObjectIdentifier("main", name)) != nullptr)
+            QMessageBox::warning(this, qApp->applicationName(), tr("There is already an object with that name. Please choose a different name."));
+        else
+            break;
+    }
+
+    // Create the view
+    if(db.executeSQL(QString("CREATE VIEW %1 AS %2;").arg(sqlb::escapeIdentifier(name)).arg(query)))
+        QMessageBox::information(this, qApp->applicationName(), tr("View successfully created."));
+    else
+        QMessageBox::warning(this, qApp->applicationName(), tr("Error creating view: %1").arg(db.lastError()));
+}
+
+
+void MainWindow::saveFilterAsView()
+{
+    if (m_browseTableModel->filterCount() > 0)
+        // Save as view a custom query without rowid
+        saveAsView(m_browseTableModel->customQuery(false));
+    else
+        QMessageBox::information(this, qApp->applicationName(), tr("There is not any filter set for this table. View will not be created."));
+
+}

src/MainWindow.h

@@ -190,6 +190,7 @@ private:
     void activateFields(bool enable = true);
     void enableEditing(bool enable_edit, bool enable_insertdelete);
     void loadExtensionsFromSettings();
+    void saveAsView(QString query);
 
     sqlb::ObjectIdentifier currentlyBrowsedTableName() const;
 
@@ -291,6 +292,7 @@ private slots:
     void renameSqlTab(int index);
     void setFindFrameVisibility(bool show);
     void openFindReplaceDialog();
+    void saveFilterAsView();
 };
 
 #endif

src/MainWindow.ui

@@ -158,6 +158,20 @@
             </property>
            </widget>
           </item>
+          <item>
+           <widget class="QToolButton" name="buttonSaveFilterAsView">
+            <property name="toolTip">
+             <string>Save the current filter as a view</string>
+            </property>
+            <property name="text">
+             <string>...</string>
+            </property>
+            <property name="icon">
+             <iconset resource="icons/icons.qrc">
+              <normaloff>:/icons/save_table</normaloff>:/icons/save_table</iconset>
+            </property>
+           </widget>
+          </item>
           <item>
            <spacer name="horizontalSpacer">
             <property name="orientation">
@@ -3021,6 +3035,22 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>buttonSaveFilterAsView</sender>
+   <signal>clicked()</signal>
+   <receiver>MainWindow</receiver>
+   <slot>saveFilterAsView()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>290</x>
+     <y>127</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>518</x>
+     <y>314</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
  <slots>
   <slot>fileOpen()</slot>

src/sqlitetablemodel.cpp

@@ -216,6 +216,11 @@ int SqliteTableModel::columnCount(const QModelIndex&) const
     return m_headers.size();
 }
 
+int SqliteTableModel::filterCount() const
+{
+    return m_mWhere.size();
+}
+
 QVariant SqliteTableModel::headerData(int section, Qt::Orientation orientation, int role) const
 {
     if (role != Qt::DisplayRole)
@@ -590,7 +595,7 @@ void SqliteTableModel::fetchData(unsigned int from, unsigned to)
     });
 }
 
-void SqliteTableModel::buildQuery()
+QString SqliteTableModel::customQuery(bool withRowid)
 {
     QString where;
 
@@ -600,12 +605,8 @@ void SqliteTableModel::buildQuery()
 
         for(QMap<int, QString>::const_iterator i=m_mWhere.constBegin();i!=m_mWhere.constEnd();++i)
         {
-            QString column;
-            if(m_vDisplayFormat.size())
-                column = QString("col%1").arg(i.key());
-            else
-                column = m_headers.at(i.key());
-            where.append(QString("%1 %2 AND ").arg(sqlb::escapeIdentifier(column)).arg(i.value()));
+            QString column = sqlb::escapeIdentifier(m_headers.at(i.key()));
+            where.append(QString("%1 %2 AND ").arg(column).arg(i.value()));
         }
 
         // Remove last 'AND '
@@ -613,12 +614,20 @@ void SqliteTableModel::buildQuery()
     }
 
     QString selector;
+    if (withRowid)
+        selector = sqlb::escapeIdentifier(m_headers.at(0)) + ",";
+
     if(m_vDisplayFormat.empty())
     {
-        selector = "*";
+        selector += "*";
     } else {
-        for(int i=0;i<m_vDisplayFormat.size();i++)
-            selector += m_vDisplayFormat.at(i) + " AS " + QString("col%1").arg(i+1) + ",";
+        for(int i=0;i<m_vDisplayFormat.size();i++) {
+            QString column = sqlb::escapeIdentifier(m_headers.at(i+1));
+            if (m_vDisplayFormat.at(i) == column)
+                selector += column + ",";
+            else
+                selector += m_vDisplayFormat.at(i) + " AS " + column + ",";
+        }
         selector.chop(1);
     }
 
@@ -626,15 +635,18 @@ void SqliteTableModel::buildQuery()
     // The reason is that we're adding '%' characters automatically around search terms (and even if we didn't the user could add
     // them manually) which means that e.g. searching for '1' results in another '%1' in the string which then totally confuses
     // the QString::arg() function, resulting in an invalid SQL.
-    QString sql = QString("SELECT %1,%2 FROM %3 ")
-            .arg(sqlb::escapeIdentifier(m_headers.at(0)))
+    return QString("SELECT %1 FROM %2 ")
             .arg(selector)
             .arg(m_sTable.toString())
             + where
             + QString("ORDER BY %1 %2")
             .arg(sqlb::escapeIdentifier(m_headers.at(m_iSortColumn)))
             .arg(m_sSortOrder);
-    setQuery(sql, true);
+}
+
+void SqliteTableModel::buildQuery()
+{
+    setQuery(customQuery(true), true);
 }
 
 void SqliteTableModel::removeCommentsFromQuery(QString& query) {

src/sqlitetablemodel.h

@@ -26,6 +26,7 @@ public:
     int rowCount(const QModelIndex &parent = QModelIndex()) const;
     int totalRowCount() const;
     int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    int filterCount() const;
     QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
     bool setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole);
@@ -40,6 +41,7 @@ public:
 
     void setQuery(const QString& sQuery, bool dontClearHeaders = false);
     QString query() const { return m_sQuery; }
+    QString customQuery(bool withRowid);
     void setTable(const sqlb::ObjectIdentifier& table, int sortColumn = 0, Qt::SortOrder sortOrder = Qt::AscendingOrder, const QVector<QString> &display_format = QVector<QString>());
     void setChunkSize(size_t chunksize);
     void sort(int column, Qt::SortOrder order = Qt::AscendingOrder);