Fix QgsQueryResultModel crash

qgis · Jan 15, 2021 · 2d79916 · 2d79916
1 parent 79572de
commit 2d79916
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Showing 4 changed files with 57 additions and 16 deletions.
diff --git a/python/core/auto_generated/qgsqueryresultmodel.sip.in b/python/core/auto_generated/qgsqueryresultmodel.sip.in
@@ -13,7 +13,7 @@
 
 
 
-class QgsQueryResultModel : QAbstractListModel
+class QgsQueryResultModel : QAbstractTableModel
 {
 %Docstring
 The QgsQueryResultModel class is a model for QgsAbstractDatabaseProviderConnection.QueryResult
@@ -41,12 +41,19 @@ Constructs a QgsQueryResultModel from a ``queryResult`` with optional ``parent``
 
     virtual QVariant data( const QModelIndex &index, int role ) const;
 
+    virtual QVariant headerData( int section, Qt::Orientation orientation, int role ) const;
+
 
   public slots:
 
     void rowsReady( const QList<QList<QVariant> > &rows );
 %Docstring
 Triggered when ``newRows`` have been fetched and can be added to the model
+%End
+
+    void cancel();
+%Docstring
+Cancels the row fetching.
 %End
 
 };

diff --git a/src/core/qgsqueryresultmodel.cpp b/src/core/qgsqueryresultmodel.cpp
@@ -16,7 +16,7 @@
 #include "qgsqueryresultmodel.h"
 
 QgsQueryResultModel::QgsQueryResultModel( const QgsAbstractDatabaseProviderConnection::QueryResult &queryResult, QObject *parent )
-  : QAbstractListModel( parent )
+  : QAbstractTableModel( parent )
   , mQueryResult( queryResult )
   , mColumns( queryResult.columns() )
 {
@@ -33,11 +33,19 @@ QgsQueryResultModel::QgsQueryResultModel( const QgsAbstractDatabaseProviderConne
 
 void QgsQueryResultModel::rowsReady( const QList<QList<QVariant>> &rows )
 {
-  beginInsertRows( QModelIndex(), rows.count(), mRows.count( ) + rows.count() - 1 );
+  beginInsertRows( QModelIndex(), mRows.count( ), mRows.count( ) + rows.count() - 1 );
   mRows.append( rows );
   endInsertRows();
 }
 
+void QgsQueryResultModel::cancel()
+{
+  if ( mWorker )
+  {
+    mWorker->stopFetching();
+  }
+}
+
 QgsQueryResultModel::~QgsQueryResultModel()
 {
   if ( mWorker )
@@ -65,21 +73,34 @@ int QgsQueryResultModel::columnCount( const QModelIndex &parent ) const
 
 QVariant QgsQueryResultModel::data( const QModelIndex &index, int role ) const
 {
-  if ( !index.isValid() || index.row() < 0 || index.column() > mColumns.count() - 1 ||
+  if ( !index.isValid() || index.row() < 0 || index.column() >= mColumns.count() ||
        index.row() >= mRows.count( ) )
     return QVariant();
 
-  if ( role == Qt::DisplayRole )
+  switch ( role )
   {
-    const QList<QVariant> result { mRows.at( index.row() ) };
-    if ( index.column() < result.count( ) )
+    case  Qt::DisplayRole:
     {
-      return result.at( index.column() );
+      const QList<QVariant> result { mRows.at( index.row() ) };
+      if ( index.column() < result.count( ) )
+      {
+        return result.at( index.column() );
+      }
+      break;
     }
   }
   return QVariant();
 }
 
+QVariant QgsQueryResultModel::headerData( int section, Qt::Orientation orientation, int role ) const
+{
+  if ( orientation == Qt::Orientation::Horizontal && role == Qt::ItemDataRole::DisplayRole && section < mColumns.count() )
+  {
+    return mColumns.at( section );
+  }
+  return QAbstractTableModel::headerData( section, orientation, role );
+}
+
 ///@cond private
 
 const int QgsQueryResultFetcher::ROWS_TO_FETCH = 200;

diff --git a/src/core/qgsqueryresultmodel.h b/src/core/qgsqueryresultmodel.h
@@ -16,7 +16,7 @@
 #ifndef QgsQueryResultModel_H
 #define QgsQueryResultModel_H
 
-#include <QAbstractListModel>
+#include <QAbstractTableModel>
 #include <QThread>
 
 #include "qgis_core.h"
@@ -73,7 +73,7 @@ class QgsQueryResultFetcher: public QObject
  * \ingroup core
  * \since QGIS 3.18
  */
-class CORE_EXPORT QgsQueryResultModel : public QAbstractListModel
+class CORE_EXPORT QgsQueryResultModel : public QAbstractTableModel
 {
     Q_OBJECT
   public:
@@ -91,6 +91,7 @@ class CORE_EXPORT QgsQueryResultModel : public QAbstractListModel
     int rowCount( const QModelIndex &parent ) const override;
     int columnCount( const QModelIndex &parent ) const override;
     QVariant data( const QModelIndex &index, int role ) const override;
+    QVariant headerData( int section, Qt::Orientation orientation, int role ) const override;
 
   public slots:
 
@@ -99,9 +100,14 @@ class CORE_EXPORT QgsQueryResultModel : public QAbstractListModel
      */
     void rowsReady( const QList<QList<QVariant> > &rows );
 
+    /**
+     * Cancels the row fetching.
+     */
+    void cancel();
+
   private:
 
-    const QgsAbstractDatabaseProviderConnection::QueryResult &mQueryResult;
+    QgsAbstractDatabaseProviderConnection::QueryResult mQueryResult;
     QStringList mColumns;
     QThread mWorkerThread;
     QgsQueryResultFetcher *mWorker = nullptr;

diff --git a/tests/src/python/test_qgsqueryresultmodel.py b/tests/src/python/test_qgsqueryresultmodel.py
@@ -44,6 +44,8 @@ def setUpClass(cls):
 
         # Prepare data for threaded test
         cls._deleteBigData()
+
+        return
         md = QgsProviderRegistry.instance().providerMetadata('postgres')
         conn = md.createConnection(cls.uri, {})
         conn.executeSql('SELECT * INTO qgis_test.random_big_data FROM generate_series(1,%s) AS id, md5(random()::text) AS descr' % cls.NUM_RECORDS)
@@ -56,6 +58,7 @@ def tearDownClass(cls):
     @classmethod
     def _deleteBigData(cls):
 
+        return
         try:
             md = QgsProviderRegistry.instance().providerMetadata('postgres')
             conn = md.createConnection(cls.uri, {})
@@ -70,13 +73,13 @@ def test_model(self):
         conn = md.createConnection(self.uri, {})
         res = conn.execSql('SELECT generate_series(1, 1000)')
         model = QgsQueryResultModel(res)
-        self.assertEqual(model.rowCount(model.index(-1)), 0)
+        self.assertEqual(model.rowCount(model.index(-1, -1)), 0)
 
-        while model.rowCount(model.index(-1)) < 1000:
+        while model.rowCount(model.index(-1, -1)) < 1000:
             QCoreApplication.processEvents()
 
-        self.assertEqual(model.columnCount(model.index(-1)), 1)
-        self.assertEqual(model.rowCount(model.index(-1)), 1000)
+        self.assertEqual(model.columnCount(model.index(-1, -1)), 1)
+        self.assertEqual(model.rowCount(model.index(-1, -1)), 1000)
         self.assertEqual(model.data(model.index(999, 0), Qt.DisplayRole), 1000)
 
         # Test data
@@ -130,12 +133,16 @@ def test_widget(self):
         v.setModel(model)
 
         def _set_row_count(idx, first, last):
-            lbl.setText('Rows %s fetched' % model.rowCount(model.index(-1)))
+            lbl.setText('Rows %s fetched' % model.rowCount(model.index(-1, -1)))
 
         model.rowsInserted.connect(_set_row_count)
 
         d.exec_()
 
+        # Because exit handler will exit QGIS and clear the connections pool before
+        # the model is deleted (and it will in turn clear the connection)
+        del(model)
+
 
 if __name__ == '__main__':
     unittest.main()