从MySQL检索数据到Prolog知识库 - Retrieve data from MySQL to Prolog knowledge base?

Retrieve data from MySQL to Prolog knowledge base?

有没有办法将数据从MySQL检索到Prolog知识库？

例如，我正在尝试从MySQL数据库中的表chair检索字段：Name和price到Prolog知识库，而不是在Prolog中声明它们。

@Boris的评论很有趣。假设有一个内置的命令发出shell命令并获取输出流（在SWI-Prolog中，我们可以使用library（process）），这里有一个简单的接口，可以从MySQL查询Wordpress表。

query(USER, PWD, DB, QUERY, Columns, Rows) :-
    atom_concat('-p', PWD, PPWD),
    process_create(path(mysql), ['-u', USER, PPWD, '-D', DB, '-e', QUERY], [stdout(pipe(Out)),stderr(std)]),
    read_record(Out, Columns),
    read_records(Out, Rows).
read_record(Out, Fields) :-
    read_line_to_codes(Out, Codes),
    Codes '= end_of_file,
    atom_codes(Line, Codes),
    atomic_list_concat(Fields, ''t', Line).
read_records(Out, [Record|Rs]) :-
    read_record(Out, Record),
    !, read_records(Out, Rs).
read_records(Out, []) :-
    close(Out).

试运转：

test_query :-
    query('------','-----',a_blog,"select * from wp_options limit 10", Cols,Rows),
    writeln(columns:Cols),
    maplist(writeln, Rows).

收益率

?- test_query.
columns:[option_id,option_name,option_value,autoload]
[1,siteurl,http://localhost/a_blog,yes]
[2,home,http://localhost/a_blog,yes]
[3,blogname,a blog,yes]
[4,blogdescription,Just another WordPress site,yes]
[5,users_can_register,0,yes]
...
true.

因此，与其显示，不如断言记录：

capture_table(USER, PWD, DB, QUERY, Functor) :-
    query(USER, PWD, DB, QUERY, _Columns, Rows),
    maplist(capture_table(Functor), Rows).
capture_table(Functor, Row) :-
    Clause =.. [Functor|Row],
    assertz(Clause).