[英]How I can CONCAT vertical lines from MySQL using PHP
If have following problem. 如果有以下问题。 I cannot get values from MySQL when I have them separated with
|
将
|
分隔为|
时,无法从MySQL获取值|
I have following string: 我有以下字符串:
SELECT * FROM user WHERE CONCAT(',', category, ',') REGEXP ',(lc_8|swimming),'
and this string only works when in my MySQL I have column category
with value lc_8,swimming,
并且此字符串仅在我的MySQL
category
具有值为lc_8,swimming,
列category
lc_8,swimming,
How I can change string above to get same values but if in column I have lc_8|swimming|
我如何更改上面的字符串以获得相同的值,但是如果在列中我有
lc_8|swimming|
? ?
|
is a special character in regexps. 是正则表达式中的特殊字符。 You would need to escape it, like
\\|
您需要将其转义,例如
\\|
. 。 Try:
尝试:
SELECT * FROM user WHERE CONCAT(',', category, ',') REGEXP ',(lc_8\|swimming),'
Characters that need escaping in regexes are as follows: 需要在正则表达式中转义的字符如下:
* ? + [ ( ) { } ^ $ | \
If you really want to match the parentheses in your example, you would need to quote them as well. 如果您确实想匹配示例中的括号,则也需要引用它们。
(
and |
have a special meaning in a regular expression, you need to escape them. (
和|
在正则表达式中有特殊含义,您需要对它们进行转义。
SELECT *
FROM user
WHERE CONCAT(',', REPLACE(category, '|', '\\|'), ',') REGEXP ',\(lc_8\|swimming\),'
But if you're searching a comma-delimited list, it would be better to use the function designed for that: 但是,如果要搜索以逗号分隔的列表,则最好使用为此设计的函数:
SELECT * FROM user
WHERE FIND_IN_SET('(lc_8|swimming)', category)
Even better would be to not store comma-delimited lists in the first place, but put the categories in a separate table with one row for each category. 最好不要先存储以逗号分隔的列表,而是将类别放在单独的表中,每个类别一行。
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