ret.append(columns[col].getName());
ret.append(columnAttr[col].getName());
	private String getColumnNames() {		StringBuffer ret = new StringBuffer("{");		for (int col = 0; col < columns.length; col++) {			if (col != 0) {				ret.append(", ");			}			ret.append(columns[col].getName());		}		ret.append("}");		return ret.toString();	}