34 if ( layers.isEmpty() )
46 if ( !transaction->addLayer( layer,
false ) )
53 return transaction.release();
58 : mConnString( connString )
59 , mTransactionActive( false )
60 , mLastSavePointIsDirty( true )
66 setLayerTransactionIds(
nullptr );
76QString QgsTransaction::cleanupConnectionString(
const QString &
str )
80 static const QStringList toRemove
82 { QStringLiteral(
"|layername=" )},
83 { QStringLiteral(
"|layerid=" )},
84 { QStringLiteral(
"|subset=" )},
87 for (
const auto &strToRm : std::as_const( toRemove ) )
89 const int pos = res.indexOf( strToRm );
92 const int end = res.indexOf(
'|', pos + 1 );
95 res = res.mid( 0, pos ) + res.mid( end );
99 res = res.mid( 0, pos );
113 if ( connString.isEmpty() )
115 connString = cleanupConnectionString( layerUri );
126 if ( ! addLayersInEditMode
141 QgsDebugError( QStringLiteral(
"Couldn't start transaction because connection string for layer %1 : '%2' does not match '%3'" ).arg(
147 connect( layer, &QgsVectorLayer::destroyed,
this, &QgsTransaction::onLayerDeleted );
148 mLayers.insert( layer );
162 if ( !beginTransaction( errorMsg, statementTimeout ) )
165 setLayerTransactionIds(
this );
176 if ( !commitTransaction( errorMsg ) )
179 setLayerTransactionIds(
nullptr );
190 if ( !rollbackTransaction( errorMsg ) )
193 setLayerTransactionIds(
nullptr );
211void QgsTransaction::onLayerDeleted()
216void QgsTransaction::setLayerTransactionIds(
QgsTransaction *transaction )
218 const auto constMLayers = mLayers;
221 if ( vl->dataProvider() )
223 vl->dataProvider()->setTransaction( transaction );
238 const QString name( QStringLiteral(
"qgis" ) + ( QUuid::createUuid().toString().mid( 1, 24 ).replace(
'-', QString() ) ) );
@ TransactionSupport
Supports transactions.
void dataChanged()
Emitted whenever a change is made to the data provider which may have caused changes in the provider'...
Class for storing the component parts of a RDBMS data source URI (e.g.
QString connectionInfo(bool expandAuthConfig=true) const
Returns the connection part of the URI.
static QString quotedColumnRef(QString name)
Returns a quoted column reference (in double quotes)
QString source() const
Returns the source for the layer.
QString providerType() const
Returns the provider type (provider key) for this layer.
static void logMessage(const QString &message, const QString &tag=QString(), Qgis::MessageLevel level=Qgis::MessageLevel::Warning, bool notifyUser=true)
Adds a message to the log instance (and creates it if necessary).
QgsTransaction * createTransaction(const QString &providerKey, const QString &connString)
Returns new instance of transaction.
static QgsProviderRegistry * instance(const QString &pluginPath=QString())
Means of accessing canonical single instance.
This class allows including a set of layers in a database-side transaction, provided the layer data p...
QStack< QString > mSavepoints
bool mLastSavePointIsDirty
void afterRollback()
Emitted after a rollback.
bool rollback(QString &errorMsg)
Roll back transaction.
bool addLayer(QgsVectorLayer *layer, bool addLayersInEditMode=false)
Add the layer to the transaction.
bool begin(QString &errorMsg, int statementTimeout=20)
Begin transaction The statementTimeout (in seconds) specifies how long an sql statement is allowed to...
static bool supportsTransaction(const QgsVectorLayer *layer)
Checks if the provider of a given layer supports transactions.
virtual bool rollbackToSavepoint(const QString &name, QString &error)
rollback to save point, the save point is maintained and is "undertied"
virtual bool executeSql(const QString &sql, QString &error, bool isDirty=false, const QString &name=QString())=0
Execute the sql string.
QgsTransaction(const QString &connString)
QString connectionString() const
Returns the connection string of the transaction.
bool commit(QString &errorMsg)
Commit transaction.
~QgsTransaction() override
static QgsTransaction * create(const QString &connString, const QString &providerKey)
Create a transaction for the specified connection string connString and provider with providerKey.
QString createSavepoint(QString &error)
creates a save point returns empty string on error returns the last created savepoint if it's not dir...
void dirtyLastSavePoint()
dirty save point such that next call to createSavepoint will create a new one
virtual Q_INVOKABLE Qgis::VectorProviderCapabilities capabilities() const
Returns flags containing the supported capabilities.
virtual QgsTransaction * transaction() const
Returns the transaction this data provider is included in, if any.
Represents a vector layer which manages a vector based data sets.
bool isEditable() const FINAL
Returns true if the provider is in editing mode.
QgsVectorDataProvider * dataProvider() FINAL
Returns the layer's data provider, it may be nullptr.
#define QgsDebugError(str)