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Make sure DB upgrades happen atomically

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This commit is contained in:
Luis Ángel San Martín
2025-06-15 18:12:07 +02:00
parent c621c2705b
commit 6a4f9730f5
1 changed files with 191 additions and 186 deletions
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25
YACReaderLibrary/db/data_base_management.cpp
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@ -901,8 +901,11 @@ bool DataBaseManagement::updateToCurrentVersion(const QString &libraryPath)
{
QSqlDatabase db = loadDatabaseFromFile(libraryDatabasePath);
if (db.isValid() && db.isOpen()) {
if (pre7) // TODO: execute only if previous version was < 7.0
{
if (!db.transaction()) {
QLOG_ERROR() << "Failed to start transaction for database update";
returnValue = false;
} else {
if (pre7) {
// new 7.0 fields
QStringList columnDefs;
columnDefs << "hasBeenOpened BOOLEAN DEFAULT 0"
@ -918,7 +921,6 @@ bool DataBaseManagement::updateToCurrentVersion(const QString &libraryPath)
bool successAddingColumns = addColumns("comic_info", columnDefs, db);
returnValue = returnValue && successAddingColumns;
}
// TODO update hasBeenOpened value
if (pre7_1) {
{
@ -1068,8 +1070,6 @@ bool DataBaseManagement::updateToCurrentVersion(const QString &libraryPath)
pragmaFKOFF.prepare("PRAGMA foreign_keys=OFF");
pre9_14_successfulMigration = pre9_14_successfulMigration && pragmaFKOFF.exec();
db.transaction();
pre9_14_successfulMigration = pre9_14_successfulMigration && createComicInfoTable(db, "comic_info_migration");
QSqlQuery copyComicInfoToComicInfoMigration(db);
@ -1084,11 +1084,6 @@ bool DataBaseManagement::updateToCurrentVersion(const QString &libraryPath)
renameComicInfoMigrationToComicInfo.prepare("ALTER TABLE comic_info_migration RENAME TO comic_info");
pre9_14_successfulMigration = pre9_14_successfulMigration && renameComicInfoMigrationToComicInfo.exec();
if (pre9_14_successfulMigration)
db.commit();
else
db.rollback();
QSqlQuery pragmaFKON1("PRAGMA foreign_keys=ON", db);
returnValue = returnValue && pre9_14_successfulMigration;
@ -1121,6 +1116,16 @@ bool DataBaseManagement::updateToCurrentVersion(const QString &libraryPath)
returnValue = updateVersion.numRowsAffected() > 0;
}
}
if (returnValue) {
if (!db.commit()) {
QLOG_ERROR() << "Failed to commit transaction for database update";
returnValue = false;
}
} else {
db.rollback();
}
}
connectionName = db.connectionName();
}