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MySQL-从多行替换为一行

[英]Mysql - Replace from multiple rows into one row

原文 2012-12-16 19:59:11 9 1 mysql/ join/ replace/ group-by

I have a problem i'm not sure how to solve. 我有一个问题，我不确定如何解决。

To simplify my problem there is a table with links: 为了简化我的问题，有一个带有链接的表：

fk  linkid   link
    1   1     www.stackoverflow.com
    1   2     www.google.com
    1   3     www.cnn.com
    2   4     www.other.com

Then i have another table with a string-column where a user can insert these keys and then it should replace them. 然后我有另一个带有字符串列的表，用户可以在其中插入这些键，然后将其替换。 You enter a key like L{a number}, like L1. 您输入像L {a number}这样的键，例如L1。 "L1" should then be replaced with linkid 1.. 然后应将“ L1”替换为链接ID 1。

id  string_column
    1   "Hi my first link is {L1]. More text {L1} {L1} {L3} {L2}"
    2   "Go here: {L4}"

So when i join them for id 1 i get this: 因此，当我加入他们的ID 1时，我得到了：

id  linkid  link                   string_column
    1   1       www.stackoverflow.com  "Hi my first link is {L1]. More text {L1} {L1} {L3} {L2}"
    1   2       www.google.com         "Hi my first link is {L1]. More text {L1} {L1} {L3} {L2}"
    1   3       www.cnn.com            "Hi my first link is {L1]. More text {L1} {L1} {L3} {L2}"

What i would like to get is: 我想得到的是：

id  string_column
    1   "Hi my first link is www.stackoverflow.com. More text www.stackoverflow.com www.stackoverflow.com www.cnn.com www.google.com"

Is it possible in mysql to write such an sql? 有可能在mysql中编写这样的sql吗？ As you can see above i need to make a replace on 1 column but get the values from multiple rows and then only return 1 per id. 如您在上面看到的，我需要对1列进行替换，但是要从多行中获取值，然后每个id只返回1。

Since the system is already the way it is i can't change the setup but just have to find a way to get this right. 由于系统已经是它的样子，所以我不能更改设置，而只需要找到一种方法来解决这个问题。

1 个解决方案

the only way I see to do this would be a script doing the work, where you take out all the sentences, cut the number from the L, search the corresponding link and replace all {L1} by that link. 我唯一看到的方法是执行该脚本的脚本，在该脚本中，您删除所有句子，从L处剪下数字，搜索相应的链接，然后用该链接替换所有{L1}。 then you update the db with the new string. 然后使用新字符串更新数据库。