如何在Oracle中一起替换多个字符串

Question

我有一个来自表格的字符串，例如“无法付款{1}，因为您的付款{2}到期 {3}”。我想用某个值替换 {1}，用某个值替换 {2}，用某个值替换 {3}。

是否可以在一个替换功能中替换所有 3 个？或者有什么方法可以直接编写查询并获取替换值？我想在 Oracle 存储过程中替换这些字符串原始字符串来自我的一张表我只是在该表上进行选择

然后我想将该字符串中的 {1},{2},{3} 值替换为另一个表中的另一个值

Answer 1

虽然不是一个调用，但你可以嵌套replace()调用：

SET mycol = replace( replace(mycol, '{1}', 'myoneval'), '{2}', mytwoval)

Answer 2

如果您在选择中执行此操作，则可以将其拼凑在一起，如果您的替换值是列，则使用字符串连接。

Answer 3

如果有许多变量要替换并且您将它们放在另一个表中，并且变量的数量是可变的，您可以使用递归 CTE 来替换它们。 下面是一个例子。在表 fg_rulez 中，您将替换的字符串放入其中。在表 fg_data 你有你的输入字符串。

set define off;
drop table fg_rulez
create table fg_rulez as 
  select 1 id,'<' symbol, 'less than' text from dual
  union all select 2, '>', 'great than' from dual
  union all select 3, '$', 'dollars' from dual
  union all select 4, '&', 'and' from dual;
drop table fg_data;
create table fg_Data AS(
   SELECT 'amount $ must be < 1 & > 2' str FROM dual
   union all
   SELECT 'John is >  Peter & has many $' str FROM dual
   union all
   SELECT 'Eliana is < mary & do not has many $' str FROM dual

   );


WITH  q(str, id) as (
  SELECT str, 0 id 
  FROM fg_Data 
     UNION ALL
  SELECT replace(q.str,symbol,text), fg_rulez.id
  FROM q 
  JOIN fg_rulez 
    ON q.id = fg_rulez.id - 1
)
SELECT str from q where id = (select max(id) from fg_rulez);

所以，一个replace。

结果：

amount dollars must be less than 1 and great than 2 
John is great than Peter and has many dollars 
Eliana is less than mary and do not  has many dollars

术语符号而不是变量来自this duplicated question.

Oracle 11gR2

Answer 4

如果要替换的值太多或者需要能够轻松维护，也可以拆分字符串，使用字典表，最后聚合结果

在下面的示例中，我假设您的字符串中的单词用空格分隔，并且字符串中的字数不会大于 100（数据透视表基数）

with Dict as
 (select '{1}' String, 'myfirstval' Repl from dual
   union all
  select '{2}' String, 'mysecondval' Repl from dual
   union all
  select '{3}' String, 'mythirdval' Repl from dual
   union all  
  select '{Nth}' String, 'myNthval' Repl from dual  

 )
,MyStrings as
 (select 'This  is the first example {1} ' Str, 1 strnum from dual
  union all
  select 'In the Second example all values are shown {1} {2} {3} {Nth} ', 2  from dual
  union all
  select '{3} Is the value for the third', 3 from dual
  union all
  select '{Nth} Is the value for the Nth', 4 from dual  
  )
,pivot as (
  Select Rownum Pnum
  From dual
  Connect By Rownum <= 100   
  )
,StrtoRow as
(
SELECT rownum rn
      ,ms.strnum
      ,REGEXP_SUBSTR (Str,'[^ ]+',1,pv.pnum) TXT
  FROM MyStrings ms
      ,pivot pv
where REGEXP_SUBSTR (Str,'[^ ]+',1,pv.pnum) is not null
)
Select Listagg(NVL(Repl,TXT),' ') within group (order by rn) 
from
(
Select sr.TXT, d.Repl, sr.strnum, sr.rn
  from StrtoRow sr
      ,dict d
 where sr.TXT = d.String(+) 
order by strnum, rn 
) group by strnum

Answer 5

让我们编写与 CTE 相同的示例：

with fg_rulez as (
  select 1 id,'<' symbol, 'less than' text from dual
  union all select 2, '>', 'greater than' from dual
   union all select 3, '$', 'dollars' from dual
  union all select 4, '+', 'and' from dual
),  fg_Data AS (
   SELECT 'amount $ must be < 1 + > 2' str FROM dual
   union all
   SELECT 'John is > Peter + has many $' str FROM dual
   union all
   SELECT 'Eliana is < mary + do not has many $' str FROM dual
), q(str, id) as (
  SELECT str, 0 id 
  FROM fg_Data 
     UNION ALL
  SELECT replace(q.str,symbol,text), fg_rulez.id
  FROM q 
  JOIN fg_rulez 
    ON q.id = fg_rulez.id - 1
)
SELECT str from q where id = (select max(id) from fg_rulez);