如何从SQL消息中查找子字符串?

时间:2017-02-28 13:41:24

标签: sql sql-server database

我有以下数据: -

  

1)您指定的运营商是{carrier_name}。他们会尽快与您联系以安排接机,但您可以随时致电{carrier_phone}并参考{reference_id}。它们现在是开放的,直到{close_time}。

     

2){vehicle_owner}表示他们的{body_style}已被选中。您是否会提供有关作业的更新或标记完成?

我想找到括号中的所有值 - > {___}

在括号内只能找到特定的消息。它们之间可能有任何价值。

如何使用查询找到它?

2 个答案:

答案 0 :(得分:2)

如果字符串始终遵循for i in 1..4 { if stairs >= i { count += options(stairs - i); } } 的重复模式,则解决此问题的一种方法使用Jeff Moden的CSV分割器函数,用第一个分隔符替换第二个分隔符,并使用{{3获取第二个分隔符}}:

'..{..})'

测试设置:modulo (%)

返回:

select 
    Id
 , col = x.item
from t
  cross apply (
    select Item = ltrim(rtrim(i.Item))
      from [dbo].[delimitedsplit8K](replace(t.col,'}','{'),'{') as i
      where ItemNumber%2=0
      ) x

拆分字符串参考:

测试中使用的函数:

+----+---------------+
| Id |      col      |
+----+---------------+
|  1 | carrier_name  |
|  1 | carrier_phone |
|  1 | reference_id  |
|  1 | close_time    |
|  2 | vehicle_owner |
|  2 | body_style    |
+----+---------------+

递归cte版本(无需额外功能)

create function [dbo].[delimitedsplit8K] (
      @pstring varchar(8000)
    , @pdelimiter char(1)
  )
returns table with schemabinding as
 return
  with e1(N) as (
    select 1 union all select 1 union all select 1 union all 
    select 1 union all select 1 union all select 1 union all 
    select 1 union all select 1 union all select 1 union all select 1
  )
  , e2(N) as (select 1 from e1 a, e1 b)
  , e4(N) as (select 1 from e2 a, e2 b)
  , ctetally(N) as (
    select top (isnull(datalength(@pstring),0)) 
      row_number() over (order by (select null)) from e4
  )
  , ctestart(N1) as (
    select 1 union all
    select t.N+1 from ctetally t where substring(@pstring,t.N,1) = @pdelimiter
  )
  , ctelen(N1,L1) as (
    select s.N1,
      isnull(nullif(charindex(@pdelimiter,@pstring,s.N1),0)-s.N1,8000)
    from ctestart s
  )
 select itemnumber = row_number() over(order by l.N1)
      , item       = substring(@pstring, l.N1, l.L1)
   from ctelen l
;

返回:

;with cte as (
  select 
      id
    , val = left(stuff(col, 1, charindex('{', col),'')
              , charindex('}', col) - charindex('{', col) - 1
            ) 
    , rest = stuff(col, 1, charindex('}', col) + 1,'') 
  from t
  where col like '%{%}%'
  union all
  select 
      id
    , val = left(stuff(rest, 1, charindex('{', rest),'')
              , charindex('}', rest) - charindex('{', rest) - 1
            ) 
    , rest = stuff(rest, 1, charindex('}', rest) + 1,'') 
  from cte
  where rest like '%{%}%'
)
select id, val
from cte
order by id, val;

答案 1 :(得分:-1)

  

这可以通过 SUBSTRING CHARINDEX

来实现
SUBSTRING(@Text, CHARINDEX('%{%',@Text), CHARINDEX('%}%',@Text))

CHARINDEX给出搜索字符串第一次出现的值。在SUBSTRING中提供这些值,您可以获得所需的输出。