/// <summary> /// Executes the migrations against the database. /// </summary> /// <param name="database">The PetaPoco Database, which the migrations will be run against</param> /// <param name="databaseProvider"></param> /// <param name="isUpgrade">Boolean indicating whether this is an upgrade or downgrade</param> /// <returns><c>True</c> if migrations were applied, otherwise <c>False</c></returns> public bool Execute(Database database, DatabaseProviders databaseProvider, bool isUpgrade = true) { LogHelper.Info <MigrationRunner>("Initializing database migrations"); var foundMigrations = MigrationResolver.Current.Migrations; var migrations = isUpgrade ? OrderedUpgradeMigrations(foundMigrations).ToList() : OrderedDowngradeMigrations(foundMigrations).ToList(); if (Migrating.IsRaisedEventCancelled(new MigrationEventArgs(migrations, _configuredVersion, _targetVersion, true), this)) { return(false); } //Loop through migrations to generate sql var context = new MigrationContext(databaseProvider, database); foreach (MigrationBase migration in migrations) { if (isUpgrade) { migration.GetUpExpressions(context); LogHelper.Info <MigrationRunner>(string.Format("Added UPGRADE migration '{0}' to context", migration.GetType().Name)); } else { migration.GetDownExpressions(context); LogHelper.Info <MigrationRunner>(string.Format("Added DOWNGRADE migration '{0}' to context", migration.GetType().Name)); } } //Transactional execution of the sql that was generated from the found migrations using (Transaction transaction = database.GetTransaction()) { int i = 1; foreach (var expression in context.Expressions) { var sql = expression.Process(database); if (string.IsNullOrEmpty(sql)) { i++; continue; } LogHelper.Info <MigrationRunner>("Executing sql statement " + i + ": " + sql); database.Execute(sql); i++; } transaction.Complete(); } Migrated.RaiseEvent(new MigrationEventArgs(migrations, context, _configuredVersion, _targetVersion, false), this); return(true); }
/// <summary> /// Executes the migrations against the database. /// </summary> /// <param name="database">The PetaPoco Database, which the migrations will be run against</param> /// <param name="databaseProvider"></param> /// <param name="isUpgrade">Boolean indicating whether this is an upgrade or downgrade</param> /// <returns><c>True</c> if migrations were applied, otherwise <c>False</c></returns> public virtual bool Execute(Database database, DatabaseProviders databaseProvider, bool isUpgrade = true) { _logger.Info <MigrationRunner>("Initializing database migrations"); var foundMigrations = FindMigrations(); //filter all non-schema migrations var migrations = isUpgrade ? OrderedUpgradeMigrations(foundMigrations).ToList() : OrderedDowngradeMigrations(foundMigrations).ToList(); if (Migrating.IsRaisedEventCancelled(new MigrationEventArgs(migrations, _currentVersion, _targetVersion, _productName, true), this)) { _logger.Warn <MigrationRunner>("Migration was cancelled by an event"); return(false); } //Loop through migrations to generate sql var migrationContext = InitializeMigrations(migrations, database, databaseProvider, isUpgrade); try { ExecuteMigrations(migrationContext, database); } catch (Exception ex) { //if this fails then the transaction will be rolled back, BUT if we are using MySql this is not the case, //since it does not support schema changes in a transaction, see: http://dev.mysql.com/doc/refman/5.0/en/implicit-commit.html //so in that case we have to downgrade if (databaseProvider == DatabaseProviders.MySql) { throw new DataLossException( "An error occurred running a schema migration but the changes could not be rolled back. Error: " + ex.Message + ". In some cases, it may be required that the database be restored to it's original state before running this upgrade process again.", ex); } //continue throwing the exception throw; } Migrated.RaiseEvent(new MigrationEventArgs(migrations, migrationContext, _currentVersion, _targetVersion, _productName, false), this); return(true); }