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https://github.com/saitohirga/WSJT-X.git
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76 lines
1.6 KiB
C++
76 lines
1.6 KiB
C++
#ifndef QT_DB_HELPERS_HPP_
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#define QT_DB_HELPERS_HPP_
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#include <utility>
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#include <stdexcept>
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#include <QString>
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#include <QSqlError>
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#include <QSqlTableModel>
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template<typename T, typename Func, typename... Args>
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void SQL_error_check (T&& object, Func func, Args&&... args)
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{
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if (!(std::forward<T> (object).*func) (std::forward<Args> (args)...))
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{
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auto error = object.lastError ();
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if (QSqlError::NoError != error.type ())
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{
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throw std::runtime_error {("Database Error: " + error.text ()).toStdString ()};
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}
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}
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}
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class ConditionalTransaction final
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: private boost::noncopyable
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{
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public:
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explicit ConditionalTransaction (QSqlTableModel& model)
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: model_ (model)
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, submitted_ {false}
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{
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model_.database ().transaction ();
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}
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bool submit (bool throw_on_error = true)
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{
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Q_ASSERT (model_.isDirty ());
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bool ok {true};
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if (throw_on_error)
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{
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SQL_error_check (model_, &QSqlTableModel::submitAll);
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}
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else
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{
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ok = model_.submitAll ();
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}
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submitted_ = submitted_ || ok;
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return ok;
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}
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void revert ()
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{
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Q_ASSERT (model_.isDirty ());
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model_.revertAll ();
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}
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~ConditionalTransaction ()
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{
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if (model_.isDirty ())
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{
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// abandon un-submitted changes to the model
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model_.revertAll ();
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}
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auto database = model_.database ();
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if (submitted_)
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{
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SQL_error_check (database, &QSqlDatabase::commit);
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}
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else
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{
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database.rollback ();
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}
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}
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private:
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QSqlTableModel& model_;
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bool submitted_;
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};
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#endif
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