[FEATURE] Add a flag to dirty edit buffer when using executeSql in tr…

…ansactions

python/core/qgstransaction.sip

@@ -97,10 +97,16 @@ class QgsTransaction : QObject /Abstract/
  :rtype: bool
 %End
 
-    virtual bool executeSql( const QString &sql, QString &error /Out/ ) = 0;
+    virtual bool executeSql( const QString &sql, QString &error /Out/, bool isDirty = false ) = 0;
 %Docstring
  Execute the ``sql`` string. The result must not be a tuple, so running a
  ``SELECT`` query will return an error.
+
+ \param sql The sql query to execute
+ \param error The error message
+ \param isDirty Flag to indicate if the underlying data will be modified
+
+ :return: true if everything is OK, false otherwise
  :rtype: bool
 %End
 
@@ -161,6 +167,11 @@ class QgsTransaction : QObject /Abstract/
  Emitted after a rollback
 %End
 
+    void dirty( const QString &sql );
+%Docstring
+ Emitted if a sql query is executed and the underlying data is modified
+%End
+
   protected:
 
 

python/core/qgsvectorlayereditpassthrough.sip

@@ -41,6 +41,19 @@ class QgsVectorLayerEditPassthrough : QgsVectorLayerEditBuffer
     virtual void rollBack();
 
 
+    bool update( QgsTransaction *transaction, const QString &sql );
+%Docstring
+ Update underlying data with a SQL query embedded in a transaction.
+
+ \param transaction Transaction in which the sql query has been run
+ \param sql The SQL query updating data
+
+ :return: true if the undo/redo command is well added to the stack, false otherwise
+
+.. versionadded:: 3.0
+ :rtype: bool
+%End
+
 };
 
 /************************************************************************

python/core/qgsvectorlayerundopassthroughcommand.sip

@@ -23,11 +23,12 @@ class QgsVectorLayerUndoPassthroughCommand : QgsVectorLayerUndoCommand
 %End
   public:
 
-    QgsVectorLayerUndoPassthroughCommand( QgsVectorLayerEditBuffer *buffer, const QString &text );
+    QgsVectorLayerUndoPassthroughCommand( QgsVectorLayerEditBuffer *buffer, const QString &text, bool autocreate = true );
 %Docstring
  Constructor for QgsVectorLayerUndoPassthroughCommand
  \param buffer associated edit buffer
  \param text text associated with command
+ \param autocreate flag allowing to automatically create a savepoint if necessary
 %End
 
     bool hasError() const;
@@ -58,6 +59,9 @@ class QgsVectorLayerUndoPassthroughCommand : QgsVectorLayerUndoCommand
  Set error flag and append "failed" to text
 %End
 
+
+  protected:
+
 };
 
 
@@ -246,6 +250,32 @@ class QgsVectorLayerUndoPassthroughCommandRenameAttribute : QgsVectorLayerUndoPa
 
 };
 
+
+class QgsVectorLayerUndoPassthroughCommandUpdate : QgsVectorLayerUndoPassthroughCommand
+{
+%Docstring
+ Undo command for running a specific sql query in transaction group.
+.. versionadded:: 3.0
+%End
+
+%TypeHeaderCode
+#include "qgsvectorlayerundopassthroughcommand.h"
+%End
+  public:
+
+    QgsVectorLayerUndoPassthroughCommandUpdate( QgsVectorLayerEditBuffer *buffer /Transfer/, QgsTransaction *transaction, const QString &sql );
+%Docstring
+ Constructor for QgsVectorLayerUndoCommandUpdate
+ \param buffer associated edit buffer
+ \param transaction transaction running the sql query
+ \param sql the query
+%End
+
+    virtual void undo();
+    virtual void redo();
+
+};
+
 /************************************************************************
  * This file has been generated automatically from                      *
  *                                                                      *

src/core/qgstransaction.cpp

@@ -201,7 +201,7 @@ QString QgsTransaction::createSavepoint( QString &error SIP_OUT )
   if ( !mTransactionActive )
     return QString();
 
-  if ( !mLastSavePointIsDirty )
+  if ( !mLastSavePointIsDirty && !mSavepoints.isEmpty() )
     return mSavepoints.top();
 
   const QString name( QUuid::createUuid().toString() );

src/core/qgstransaction.h

@@ -111,8 +111,14 @@ class CORE_EXPORT QgsTransaction : public QObject SIP_ABSTRACT
     /**
      * Execute the \a sql string. The result must not be a tuple, so running a
      * ``SELECT`` query will return an error.
+     *
+     * \param sql The sql query to execute
+     * \param error The error message
+     * \param isDirty Flag to indicate if the underlying data will be modified
+     *
+     * \returns true if everything is OK, false otherwise
      */
-    virtual bool executeSql( const QString &sql, QString &error SIP_OUT ) = 0;
+    virtual bool executeSql( const QString &sql, QString &error SIP_OUT, bool isDirty = false ) = 0;
 
     /**
      * Checks if a the provider of a given \a layer supports transactions.
@@ -165,6 +171,11 @@ class CORE_EXPORT QgsTransaction : public QObject SIP_ABSTRACT
      */
     void afterRollback();
 
+    /**
+     * Emitted if a sql query is executed and the underlying data is modified
+     */
+    void dirty( const QString &sql );
+
   protected:
     QgsTransaction( const QString &connString ) SIP_SKIP;
 

src/core/qgsvectorlayer.cpp

@@ -1345,6 +1345,8 @@ bool QgsVectorLayer::startEditing()
   if ( mDataProvider->transaction() )
   {
     mEditBuffer = new QgsVectorLayerEditPassthrough( this );
+
+    connect( mDataProvider->transaction(), &QgsTransaction::dirty, this, &QgsVectorLayer::onDirtyTransaction, Qt::UniqueConnection );
   }
   else
   {
@@ -4575,3 +4577,11 @@ bool QgsVectorLayer::readExtentFromXml() const
   return mReadExtentFromXml;
 }
 
+void QgsVectorLayer::onDirtyTransaction( const QString &sql )
+{
+  QgsTransaction *tr = dataProvider()->transaction();
+  if ( tr && mEditBuffer )
+  {
+    dynamic_cast<QgsVectorLayerEditPassthrough *>( mEditBuffer )->update( tr, sql );
+  }
+}

src/core/qgsvectorlayer.h

@@ -2066,6 +2066,7 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer, public QgsExpressionConte
     void onFeatureDeleted( QgsFeatureId fid );
     void onRelationsLoaded();
     void onSymbolsCounted();
+    void onDirtyTransaction( const QString &sql );
 
   protected:
     //! Set the extent

src/core/qgsvectorlayereditbuffer.h

@@ -267,6 +267,7 @@ class CORE_EXPORT QgsVectorLayerEditBuffer : public QObject
     friend class QgsVectorLayerUndoPassthroughCommandAddAttribute;
     friend class QgsVectorLayerUndoPassthroughCommandDeleteAttribute;
     friend class QgsVectorLayerUndoPassthroughCommandRenameAttribute;
+    friend class QgsVectorLayerUndoPassthroughCommandUpdate;
 
     /**
      * Deleted feature IDs which are not committed.  Note a feature can be added and then deleted

src/core/qgsvectorlayereditpassthrough.cpp

@@ -17,6 +17,7 @@
 #include "qgsvectorlayer.h"
 #include "qgsvectordataprovider.h"
 #include "qgsvectorlayerundopassthroughcommand.h"
+#include "qgstransaction.h"
 
 QgsVectorLayerEditPassthrough::QgsVectorLayerEditPassthrough( QgsVectorLayer *layer )
   : mModified( false )
@@ -35,7 +36,12 @@ bool QgsVectorLayerEditPassthrough::modify( QgsVectorLayerUndoPassthroughCommand
   if ( cmd->hasError() )
     return false;
 
-  mModified = true;
+  if ( !mModified )
+  {
+    mModified = true;
+    emit layerModified();
+  }
+
   return true;
 }
 
@@ -105,3 +111,8 @@ void QgsVectorLayerEditPassthrough::rollBack()
 {
   mModified = false;
 }
+
+bool QgsVectorLayerEditPassthrough::update( QgsTransaction *tr, const QString &sql )
+{
+  return modify( new QgsVectorLayerUndoPassthroughCommandUpdate( this, tr, sql ) );
+}

src/core/qgsvectorlayereditpassthrough.h

@@ -20,6 +20,7 @@
 
 class QgsVectorLayer;
 class QgsVectorLayerUndoPassthroughCommand;
+class QgsTransaction;
 
 /**
  * \ingroup core
@@ -43,6 +44,18 @@ class CORE_EXPORT QgsVectorLayerEditPassthrough : public QgsVectorLayerEditBuffe
     bool commitChanges( QStringList &commitErrors ) override;
     void rollBack() override;
 
+    /**
+     * Update underlying data with a SQL query embedded in a transaction.
+     *
+     * \param transaction Transaction in which the sql query has been run
+     * \param sql The SQL query updating data
+     *
+     * \returns true if the undo/redo command is well added to the stack, false otherwise
+     *
+     * \since QGIS 3.0
+     */
+    bool update( QgsTransaction *transaction, const QString &sql );
+
   private:
     bool mModified;
 

src/core/qgsvectorlayerundopassthroughcommand.cpp

@@ -29,9 +29,9 @@
 //@todo use setObsolete instead of mHasError when upgrading qt version, this will allow auto removal of the command
 // for the moment a errored command is left on the stack
 
-QgsVectorLayerUndoPassthroughCommand::QgsVectorLayerUndoPassthroughCommand( QgsVectorLayerEditBuffer *buffer, const QString &text )
+QgsVectorLayerUndoPassthroughCommand::QgsVectorLayerUndoPassthroughCommand( QgsVectorLayerEditBuffer *buffer, const QString &text, bool autocreate )
   : QgsVectorLayerUndoCommand( buffer )
-  , mSavePointId( mBuffer->L->isEditCommandActive()
+  , mSavePointId( mBuffer->L->isEditCommandActive() || !autocreate
                   ? mBuffer->L->dataProvider()->transaction()->savePoints().last()
                   : mBuffer->L->dataProvider()->transaction()->createSavepoint( mError ) )
   , mHasError( !mError.isEmpty() )
@@ -333,3 +333,49 @@ void QgsVectorLayerUndoPassthroughCommandRenameAttribute::redo()
     setError();
   }
 }
+
+QgsVectorLayerUndoPassthroughCommandUpdate::QgsVectorLayerUndoPassthroughCommandUpdate( QgsVectorLayerEditBuffer *buffer, QgsTransaction *transaction, const QString &sql )
+  : QgsVectorLayerUndoPassthroughCommand( buffer, QObject::tr( "custom transaction" ), false )
+  , mTransaction( transaction )
+  , mSql( sql )
+{
+}
+
+void QgsVectorLayerUndoPassthroughCommandUpdate::undo()
+{
+  if ( rollBackToSavePoint() )
+  {
+    mUndone = true;
+    emit mBuffer->L->layerModified();
+  }
+  else
+  {
+    setError();
+  }
+}
+
+void QgsVectorLayerUndoPassthroughCommandUpdate::redo()
+{
+  // the first time that the sql query is execute is within QgsTransaction
+  // itself. So the redo has to be executed only after an undo action.
+  if ( mUndone )
+  {
+    mSavePointId = mTransaction->createSavepoint( mError );
+
+    if ( mError.isEmpty() )
+    {
+      if ( mTransaction->executeSql( mSql, mError ) )
+      {
+        mUndone = false;
+      }
+      else
+      {
+        setError();
+      }
+    }
+    else
+    {
+      setError();
+    }
+  }
+}

src/core/qgsvectorlayerundopassthroughcommand.h

@@ -36,20 +36,15 @@ class CORE_EXPORT QgsVectorLayerUndoPassthroughCommand : public QgsVectorLayerUn
      * Constructor for QgsVectorLayerUndoPassthroughCommand
      * \param buffer associated edit buffer
      * \param text text associated with command
+     * \param autocreate flag allowing to automatically create a savepoint if necessary
      */
-    QgsVectorLayerUndoPassthroughCommand( QgsVectorLayerEditBuffer *buffer, const QString &text );
+    QgsVectorLayerUndoPassthroughCommand( QgsVectorLayerEditBuffer *buffer, const QString &text, bool autocreate = true );
 
     /**
      * Returns error status
      */
     bool hasError() const { return mHasError; }
 
-  private:
-    QString mError;
-    QString mSavePointId;
-    bool mHasError;
-    bool mRecreateSavePoint;
-
   protected:
 
     /**
@@ -70,6 +65,14 @@ class CORE_EXPORT QgsVectorLayerUndoPassthroughCommand : public QgsVectorLayerUn
      */
     void setError();
 
+    QString mSavePointId;
+
+  protected:
+    QString mError;
+
+  private:
+    bool mHasError;
+    bool mRecreateSavePoint;
 };
 
 /**
@@ -265,4 +268,32 @@ class CORE_EXPORT QgsVectorLayerUndoPassthroughCommandRenameAttribute : public Q
     const QString mOldName;
 };
 
+/**
+ * \ingroup core
+ * \class QgsVectorLayerUndoPassthroughCommandUpdate
+ * \brief Undo command for running a specific sql query in transaction group.
+ * \since QGIS 3.0
+ */
+
+class CORE_EXPORT QgsVectorLayerUndoPassthroughCommandUpdate : public QgsVectorLayerUndoPassthroughCommand
+{
+  public:
+
+    /**
+     * Constructor for QgsVectorLayerUndoCommandUpdate
+     * \param buffer associated edit buffer
+     * \param transaction transaction running the sql query
+     * \param sql the query
+     */
+    QgsVectorLayerUndoPassthroughCommandUpdate( QgsVectorLayerEditBuffer *buffer SIP_TRANSFER, QgsTransaction *transaction, const QString &sql );
+
+    virtual void undo() override;
+    virtual void redo() override;
+
+  private:
+    QgsTransaction *mTransaction = nullptr;
+    QString mSql;
+    bool mUndone = false;
+};
+
 #endif