MySQL可以替换多个字符吗? [英] Can MySQL replace multiple characters?

问题描述

我正在尝试替换MySQL字段中的一堆字符.我知道REPLACE函数，但是一次只能替换一个字符串.在手册中我看不到任何合适的功能

I'm trying to replace a bunch of characters in a MySQL field. I know the REPLACE function but that only replaces one string at a time. I can't see any appropriate functions in the manual.

我可以一次替换或删除多个字符串吗?例如，我需要用破折号代替空格，并删除其他标点符号.

Can I replace or delete multiple strings at once? For example I need to replace spaces with dashes and remove other punctuation.

推荐答案

您可以链接REPLACE函数:

You can chain REPLACE functions:

select replace(replace('hello world','world','earth'),'hello','hi')

这将打印hi earth.

您甚至可以使用子查询来替换多个字符串！

You can even use subqueries to replace multiple strings!

select replace(london_english,'hello','hi') as warwickshire_english
from (
    select replace('hello world','world','earth') as london_english
) sub

或使用JOIN替换它们:

Or use a JOIN to replace them:

select group_concat(newword separator ' ')
from (
    select 'hello' as oldword
    union all
    select 'world'
) orig
inner join (
    select 'hello' as oldword, 'hi' as newword
    union all
    select 'world', 'earth'
) trans on orig.oldword = trans.oldword

我将使用常见的表表达式来进行翻译，作为读者的练习；)

I'll leave translation using common table expressions as an exercise for the reader ;)

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