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Nov 13, 2024 am 04:18 AM

How Can MySQL Triggers Be Used to Update a Related Table Upon Insert or Update Events?

MySQL ???? ???? ?? ? ???? ??? ??

?? ?? ???? ? ?? ???("ext_words_count")? ?????? ?? ??? ????? ?? ???("ext_words")? ?????? MySQL ???? ??? ? ????.

?? ??

??? ??? ???? ???? ???? ????.

  • "ext_words.word"? ?????? "ext_words_count.count"? ???????.
  • "ext_words.word"? ???? ?? ?? "ext_words_count"? ???? ???? "count"? ?????. "? 1?.

?? ?? ? ???

??? ???? ??? ???? "word_count"? ??????? ??????.

UPDATE ext_words_count
  SET word_count = word_count + 1
WHERE word = NEW.word;

??? ? ??? ?? ???? ?????? ??? ???? ????.

? ??? ???? ?? ??? ??? ???? ??? ? ????. ?? ??, ??? "ext_words_count"? ???? ??? ?????.

IF NOT EXISTS (SELECT 1 FROM ext_words_count WHERE word = NEW.word)

? ??? ?? ???? ??? ?? ?? ?? ???? ??? ??? ? ????.

?? ? ????? ?? ?? ?? ???

???? ???? ?? ? ???? ???? ?? ???? ?? ???? ??? ? ????.

CREATE TRIGGER update_count AFTER INSERT ON ext_words
FOR EACH ROW
BEGIN
  IF NOT EXISTS (SELECT 1 FROM ext_words_count WHERE word = NEW.word) THEN
    INSERT INTO ext_words_count (word) VALUES (NEW.word);
  ELSE
    UPDATE ext_words_count SET word_count = word_count + 1 WHERE word = NEW.word;
  END IF;
END

?? ? ????

?? "ext_words"? ????? ????? ? ? ???? "ext_words_count"? ??? ?? ??????? ????? ???. ???? ?? ? ????? ?? ???? ?????? ??????.

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