Question

我有一个字符串来自“无法付款{1}，因为您的付款{2}到期{3}”。我想将{1}替换为某个值，{2}替换为某个值，将{3}替换为某个值。

是否可以更换所有3合1替换功能？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个表我只是在那个表上做选择

然后我想将该字符串中的{1}，{2}，{3}值替换为另一个表中的其他值

Answer 1

虽然不是一个电话，但您可以嵌套replace()来电：

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

Answer 2

如果要替换许多变量并且在另一个表中有它们，并且变量的数量是可变的，则可以使用递归CTE来替换它们。以下是一个例子。在表fg_rulez中，您将字符串替换为替换字符串。在表fg_data中，您有输入字符串。

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 3

如果要替换的值的数量太大或者您需要能够轻松维护它，您还可以拆分字符串，使用字典表并最终聚合结果

在下面的示例中，我假设字符串中的单词用空格分隔，字符串中的wordcount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 4

让我们只与CTE编写相同的示例：

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);

Answer 5

如果你在select中做这个，你可以把它拼凑在一起，如果你的替换值是列，使用字符串连接。

如何在Oracle中一起替换多个字符串

5 个答案: