protected void removeColumns(Collection<String> removeColumnNames,String tableName){
  if (removeColumnNames != null && !removeColumnNames.isEmpty()) {
    execute(getRemoveColumnSQLs(removeColumnNames,tableName),mDb);
  }
}

protected void removeColumns ( Collection < String > removeColumnNames , String tableName ) { if ( removeColumnNames != null && ! removeColumnNames . isEmpty ( ) ) { execute ( getRemoveColumnSQLs ( removeColumnNames , tableName ) , mDb ) ; } }
when some fields are removed from class , the table should synchronize the changes by removing the corresponding columns .
