public void Migrate(IDataLoadJob job, GracefulCancellationToken cancellationToken)
{
if (_sourceDbInfo.DiscoverTables(false).All(t => t.IsEmpty()))
{
throw new Exception("The source database '" + _sourceDbInfo.GetRuntimeName() + "' on " + _sourceDbInfo.Server.Name + " is empty. There is nothing to migrate.");
}
using (var managedConnectionToDestination = _destinationDbInfo.Server.BeginNewTransactedConnection())
{
try
{
// This will eventually be provided by factory/externally based on LoadMetadata (only one strategy for now)
_migrationStrategy = new OverwriteMigrationStrategy(managedConnectionToDestination);
_migrationStrategy.TableMigrationCompleteHandler += (name, inserts, updates) =>
job.OnNotify(this, new NotifyEventArgs(ProgressEventType.Information, "Migrate table " + name + " from STAGING to " + _destinationDbInfo.GetRuntimeName() + ": " + inserts + " inserts, " + updates + " updates"));
//migrate all tables (both lookups and live tables in the same way)
var dataColsToMigrate = _migrationConfig.CreateMigrationColumnSetFromTableInfos(job.RegularTablesToLoad, job.LookupTablesToLoad,
new StagingToLiveMigrationFieldProcessor(
_databaseConfiguration.UpdateButDoNotDiff,
_databaseConfiguration.IgnoreColumns,
job.GetAllColumns().Where(c => c.IgnoreInLoads).ToArray())
{
NoBackupTrigger = job.LoadMetadata.IgnoreTrigger
});
// Migrate the data columns
_migrationStrategy.Execute(job, dataColsToMigrate, job.DataLoadInfo, cancellationToken);
managedConnectionToDestination.ManagedTransaction.CommitAndCloseConnection();
job.DataLoadInfo.CloseAndMarkComplete();
}
catch (OperationCanceledException)
{
managedConnectionToDestination.ManagedTransaction.AbandonAndCloseConnection();
}
catch (Exception ex)
{
try
{
managedConnectionToDestination.ManagedTransaction.AbandonAndCloseConnection();
}
catch (Exception)
{
throw new Exception("Failed to rollback after exception, see inner exception for details of original problem", ex);
}
throw;
}
}
}
