erlang e(QH)用法及代码示例

e(QH) -> Answers | Error

e(QH, Options) -> Answers | Error

eval(QH) -> Answers | Error

eval(QH, Options) -> Answers | Error

类型：

QH = query_handle_or_list()

Answers = answers()

Options = [Option] | Option

Option = 
    {cache_all, cache()} |
    cache_all |
    {max_list_size, max_list_size()} |
    {tmpdir_usage, tmp_file_usage()} |
    {tmpdir, tmp_directory()} |
    {unique_all, boolean()} |
    unique_all

Error = {error, module(), Reason}

Reason = file_sorter:reason()

1> QH = qlc:q([{X,Y} || X <- [a,b], Y <- [1,2]]),
qlc:eval(QH).
[{a,1},{a,2},{b,1},{b,2}]