this.dbConnections = dbConnections;
List connections = new ArrayList (); connections.add (dbConnection); this.dbConnections = connections;
  public PrepareDerivedTables(int id, int runID, 			      DBConfig dbConfig,			      //Connection dbConnection,			      List dbConnections,			      DerivedTablesConfig dtConfig,			      Logger logger){    super(id,runID,dbConfig,(Connection)dbConnections.get(0),logger);    this.dtConfig=dtConfig;    for(int i=0;i<buildTable.length;i++)      buildTable[i]=false;    workQ = new WorkQueue(logger, this);    this.dbConnections = dbConnections;  }