Deffered SQL query when database is visible

src/databaseview.cpp

@@ -157,13 +157,25 @@ void FITSFileModel::filesUnmarked(const QModelIndexList &indexes)
     }
 }
 
+void FITSFileModel::load()
+{
+    if(!m_loaded)
+    {
+        m_loaded = true;
+        prepareQuery();
+    }
+}
+
 void FITSFileModel::prepareQuery()
 {
+    if(!m_loaded)return;
+
     QString cols;
     QString join;
     QStringList where;
     QString sql = m_columns.size() ? "SELECT f.file," : "SELECT f.file";
     QVariantList bindValues;
+    QVariantList bindValuesJoin;
     for(int i=0; i<m_value.size(); i++)
     {
         if(m_key[i] == "file")
@@ -195,9 +207,9 @@ void FITSFileModel::prepareQuery()
         }
         else
         {
-            join += QString(" JOIN fits_headers AS s%1 ON f.id=s%1.id_file AND s%1.key=? AND s%1.value LIKE ?").arg(i);
-            bindValues.append(m_key[i]);
-            bindValues.append(m_value[i]);
+            join += QString(" JOIN fits_headers AS s%1 ON f.id=s%1.id_file AND s%1.key=? AND s%1.value LIKE ? ").arg(i);
+            bindValuesJoin.append(m_key[i]);
+            bindValuesJoin.append(m_value[i]);
         }
     }
     int i=0;
@@ -205,7 +217,7 @@ void FITSFileModel::prepareQuery()
     {
         cols += QString("GROUP_CONCAT(h%1.value) AS h%1_value,").arg(i);
         join += QString(" LEFT JOIN fits_headers AS h%1 ON f.id=h%1.id_file AND h%1.key=?").arg(i);
-        bindValues.append(column);
+        bindValuesJoin.append(column);
         i++;
     }
     cols.chop(1);
@@ -217,11 +229,13 @@ void FITSFileModel::prepareQuery()
 
     QSqlQuery query(m_database->db());
     query.prepare(sql);
-    for(int i = 0; i < bindValues.size(); i++)
-        query.bindValue(i, bindValues[i]);
+    for(auto &val : bindValuesJoin)
+        query.addBindValue(val);
+    for(auto &val : bindValues)
+        query.addBindValue(val);
 
     if(!query.exec())
-        qWarning() << "Failed to exectute query" << query.lastQuery();
+        qWarning() << "Failed to exectute query" << query.lastQuery() << bindValuesJoin << bindValues;
     setQuery(std::move(query));
 
     setHeaderData(0, Qt::Horizontal, tr("File name"));
@@ -424,6 +438,7 @@ bool DataBaseView::exportCSV(const QString &path)
     if(!csv.open(QIODevice::WriteOnly | QIODevice::Text))
         return false;
 
+    m_model->load();
     QSqlQuery sql(m_model->query().lastQuery());
     int colCount = m_model->columnCount();
     QStringList header;
@@ -452,3 +467,8 @@ bool DataBaseView::exportCSV(const QString &path)
     }
     return true;
 }
+
+void DataBaseView::visible(bool visible)
+{
+    if(visible)m_model->load();
+}

src/databaseview.h

@@ -30,6 +30,7 @@ class FITSFileModel : public QSqlQueryModel
     QStringList m_limit;
     QSet<QString> m_markedFiles;
     Database *m_database;
+    bool m_loaded = false;
 public:
     explicit FITSFileModel(Database *database, QObject *parent = nullptr);
     void sort(int column, Qt::SortOrder order) override;
@@ -38,6 +39,7 @@ public:
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
     void filesMarked(const QModelIndexList &indexes);
     void filesUnmarked(const QModelIndexList &indexes);
+    void load();
 protected:
     void prepareQuery();
 };
@@ -74,6 +76,7 @@ public slots:
     void itemActivated(const QModelIndex &index);
     void applyFilter();
     bool exportCSV(const QString &path);
+    void visible(bool visible);
 signals:
     void loadFile(QString file);
 };