Prolog - 如何仅断言/创建数据库一次 [英] Prolog - How to assert/make a database only once

问题描述

resultList(UsersQuery):-
    question(X,H),
    write(H),
    myintersection(H,UsersQuery,Match,TotalQuestionKeywords),
    Percent is Match/TotalQuestionKeywords*100,
    write('Question: '),
    write(X),nl,write('Quality: '), write(Percent),write('%'),nl,

    /* please look at this part
    Percent>=50,
    assert(listofQuestions(Percent,Question)),
    write(Percent),write(Question),nl,
    fail.
resultList(_).

我想填充一个名为listofQuestions"的事实数据库.一切正常，但我断言的东西留在记忆中.所以，如果我再次运行我的程序，我会在问题列表"中添加同样的一堆事实.

I want to populate a fact database named 'listofQuestions'. Everything works fine, but the stuffs that I am asserting stays in the memory. So, if I run my program again, I get the same bunch of facts added to the 'listofQuestions'.

我只想拥有一组数据.

谢谢

推荐答案

也许在重新运行程序之前执行 retractall/1.

Maybe do retractall/1 before you rerun your program.

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