mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-25 00:58:06 -05:00
174 lines
5.0 KiB
Plaintext
174 lines
5.0 KiB
Plaintext
/************************************************************************
|
|
* This file has been generated automatically from *
|
|
* *
|
|
* src/core/qgstransaction.h *
|
|
* *
|
|
* Do not edit manually ! Edit header and run scripts/sipify.pl again *
|
|
************************************************************************/
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
class QgsTransaction : QObject /Abstract/
|
|
{
|
|
%Docstring
|
|
This class allows including a set of layers in a database-side transaction,
|
|
provided the layer data providers support transactions and are compatible
|
|
with each other.
|
|
|
|
Only layers which are not in edit mode can be included in a transaction,
|
|
and all layers need to be in read-only mode for a transaction to be committed
|
|
or rolled back.
|
|
|
|
Layers can only be included in one transaction at a time.
|
|
|
|
When editing layers which are part of a transaction group, all changes are
|
|
sent directly to the data provider (bypassing the undo/redo stack), and the
|
|
changes can either be committed or rolled back on the database side via the
|
|
QgsTransaction.commit and QgsTransaction.rollback methods.
|
|
|
|
As long as the transaction is active, the state of all layer features reflects
|
|
the current state in the transaction.
|
|
|
|
Edits on features can get rejected if another conflicting transaction is active.
|
|
%End
|
|
|
|
%TypeHeaderCode
|
|
#include "qgstransaction.h"
|
|
%End
|
|
public:
|
|
|
|
static QgsTransaction *create( const QString &connString, const QString &providerKey ) /Factory/;
|
|
%Docstring
|
|
Create a transaction for the specified connection string ``connString``
|
|
and provider with ``providerKey``.
|
|
%End
|
|
|
|
static QgsTransaction *create( const QSet<QgsVectorLayer *> &layers ) /Factory/;
|
|
%Docstring
|
|
Create a transaction which includes the ``layers``.
|
|
All layers are expected to have the same connection string and data
|
|
provider.
|
|
%End
|
|
|
|
~QgsTransaction();
|
|
|
|
bool addLayer( QgsVectorLayer *layer );
|
|
%Docstring
|
|
Add the ``layer`` to the transaction. The layer must not be
|
|
in edit mode and the connection string must match.
|
|
%End
|
|
|
|
bool begin( QString &errorMsg /Out/, int statementTimeout = 20 );
|
|
%Docstring
|
|
Begin transaction
|
|
The ``statementTimeout`` (in seconds) specifies how long an sql statement
|
|
is allowed to block QGIS before it is aborted.
|
|
Statements can block, if multiple transactions are active and a
|
|
statement would produce a conflicting state. In these cases, the
|
|
statements block until the conflicting transaction is committed or
|
|
rolled back.
|
|
Some providers might not honour the statement timeout.
|
|
%End
|
|
|
|
bool commit( QString &errorMsg /Out/ );
|
|
%Docstring
|
|
Commit transaction.
|
|
%End
|
|
|
|
bool rollback( QString &errorMsg /Out/ );
|
|
%Docstring
|
|
Roll back transaction.
|
|
%End
|
|
|
|
virtual bool executeSql( const QString &sql, QString &error /Out/, bool isDirty = false, const QString &name = QString() ) = 0;
|
|
%Docstring
|
|
Execute the ``sql`` string.
|
|
|
|
:param sql: The sql query to execute
|
|
:param isDirty: Flag to indicate if the underlying data will be modified
|
|
:param name: Name of the transaction ( only used if `isDirty` is true)
|
|
|
|
:return: - true if everything is OK, false otherwise
|
|
- error: The error message
|
|
%End
|
|
|
|
static bool supportsTransaction( const QgsVectorLayer *layer );
|
|
%Docstring
|
|
Checks if the provider of a given ``layer`` supports transactions.
|
|
%End
|
|
|
|
QString createSavepoint( QString &error /Out/ );
|
|
%Docstring
|
|
creates a save point
|
|
returns empty string on error
|
|
returns the last created savepoint if it's not dirty
|
|
|
|
.. versionadded:: 3.0
|
|
%End
|
|
|
|
QString createSavepoint( const QString &savePointId, QString &error /Out/ );
|
|
%Docstring
|
|
creates a save point
|
|
returns empty string on error
|
|
|
|
.. versionadded:: 3.0
|
|
%End
|
|
|
|
bool rollbackToSavepoint( const QString &name, QString &error /Out/ );
|
|
%Docstring
|
|
rollback to save point, the save point is maintained and is "undertied"
|
|
|
|
.. versionadded:: 3.0
|
|
%End
|
|
|
|
void dirtyLastSavePoint();
|
|
%Docstring
|
|
dirty save point such that next call to createSavepoint will create a new one
|
|
|
|
.. versionadded:: 3.0
|
|
%End
|
|
|
|
QList< QString > savePoints() const;
|
|
%Docstring
|
|
returns savepoints
|
|
|
|
.. versionadded:: 3.0
|
|
%End
|
|
|
|
bool lastSavePointIsDirty() const;
|
|
%Docstring
|
|
returns the last created savepoint
|
|
|
|
.. versionadded:: 3.0
|
|
%End
|
|
|
|
|
|
signals:
|
|
|
|
void afterRollback();
|
|
%Docstring
|
|
Emitted after a rollback
|
|
%End
|
|
|
|
void dirtied( const QString &sql, const QString &name );
|
|
%Docstring
|
|
Emitted if a sql query is executed and the underlying data is modified
|
|
%End
|
|
|
|
protected:
|
|
|
|
|
|
};
|
|
|
|
/************************************************************************
|
|
* This file has been generated automatically from *
|
|
* *
|
|
* src/core/qgstransaction.h *
|
|
* *
|
|
* Do not edit manually ! Edit header and run scripts/sipify.pl again *
|
|
************************************************************************/
|