mysql 根据固定字符分割字符串

根据固定字符分割字符串可以使用MySQL的字符串分割函数substring_index。该函数的语法为substring_index(str, delim, count)，其中str是要处理的字符串，delim是分隔符，count是计数。如果count是正数，函数会从左往右数，返回第N个分隔符左边的全部内容；如果count是负数，函数会从右往左数，返回第N个分隔符右边的所有内容。例如，如果要根据竖线字符"|"分割字符串"1|2|3|4|5"，可以使用substring_index函数如下：

SELECT substring_index("1|2|3|4|5", "|", 1) AS split1,
substring_index(substring_index("1|2|3|4|5", "|", 2), "|", -1) AS split2,
substring_index(substring_index("1|2|3|4|5", "|", 3), "|", -1) AS split3,
substring_index(substring_index("1|2|3|4|5", "|", 4), "|", -1) AS split4,
substring_index(substring_index("1|2|3|4|5", "|", 5), "|", -1) AS split5;

这样就可以将字符串"1|2|3|4|5"根据竖线字符分割成五个列展示，分别为split1、split2、split3、split4、split5。每个列对应字符串中的一个层级id。
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