等价于在 MySQL 中处理字符串的 explode()-数据库问题

Equivalent of explode() to work with strings in MySQL(等价于在 MySQL 中处理字符串的 explode())

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问题描述

在 MySQL 中，当另一个值 = '7 - 31' 时，我希望能够搜索 '31 - 7'.我将使用什么语法来拆分 MySQL 中的字符串?在 PHP 中，我可能会使用 explode(' - ',$string) 并将它们放在一起.有没有办法在 MySQL 中做到这一点?

In MySQL, I want to be able to search for '31 - 7', when another value = '7 - 31'. What is the syntax that I would use to break apart strings in MySQL? In PHP, I would probably use explode(' - ',$string) and put them together. Is there a way to do this in MySQL?

背景:我正在处理运动成绩，并想尝试分数相同的比赛(并且也是在同一日期) - 每支球队列出的分数与其对手的数据库记录相比是倒数的.

Background: I'm working with sports scores and want to try games where the scores are the same (and also on the same date) - the listed score for each team is backwards compare to their opponent's database record.

理想的 MySQL 调用应该是:

The ideal MySQL call would be:

Where opponent1.date  = opponent2.date
  AND opponent1.score = opponent2.score

(opponent2.score 需要向后 opponent1.score).

推荐答案

MYSQL 没有内置类似 explode() 的函数.但是您可以轻松地将类似的函数添加到您的数据库中，然后从php 查询.该函数将如下所示:

MYSQL has no explode() like function built in. But you can easily add similar function to your DB and then use it from php queries. That function will look like:

CREATE FUNCTION SPLIT_STRING(str VARCHAR(255), delim VARCHAR(12), pos INT)
RETURNS VARCHAR(255)
RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(str, delim, pos),
       CHAR_LENGTH(SUBSTRING_INDEX(str, delim, pos-1)) + 1),
       delim, '');

用法:

SELECT SPLIT_STRING('apple, pear, melon', ',', 1)

上面的例子将返回apple.我认为在 MySQL 中返回数组是不可能的，因此您必须在 pos 中明确指定要返回的事件.如果你成功使用它，请告诉我.

The example above will return apple. I think that it will be impossible to return array in MySQL so you must specify which occurrence to return explicitly in pos. Let me know if you succeed using it.

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