mysql - SQL - 提取可变长度字符串的数字部分

Question

这是一个例子：

[U_TipTon]=118.7->59.35；[U_Haulge]=428.28->214.14

我只需要将 118.7->59.35 提取为 Tipton，并在另一列中提取 428.28->214.14 作为 U_Haulage。

字符串的长度和我的模式词的位置一样是可变的。

我正在尝试使用 Patindex，但找不到方法。

Answer 1

In MySQL there's SUBSTRING_INDEX, which extracts a substring based on a delimiter:

select
  substring_index(substring_index(x, '[U_TipTon]=', -1), ';', 1) as TipTon
  ,substring_index(substring_index(x, '[U_Haulge]=', -1), ';', 1) as Haulge
from
 (
   select '[U_TipTon]=118.7->59.35;[U_Haulge]=428.28->214.14' as x
 ) as dt

Edit: In MS SQL Server it's more complicated:

select 
   substring(xHaulge, 1, charindex(';', xHaulge + ';')-1) as Haulge,
   substring(xTipTon, 1, charindex(';', xTipTon + ';')-1) as TipTon
from
 (
   select
      case when charindex('[U_Haulge]=', x) > 0 
           then substring(x, charindex('[U_Haulge]=', x) + len('[U_Haulge]='), 8000)
           else '' 
      end as xHaulge,
      case when charindex('[U_TipTon]=', x) > 0 
           then substring(x, charindex('[U_TipTon]=', x) + len('[U_TipTon]='), 8000) 
           else '' 
      end as xTipTon
   from 
    (
      select '[U_TipTon]=118.7->59.35;[U_Haulge]=428.28->214.14' as x
    ) as dt
 ) as dt

Answer 2

解决方案是：

当 charindex('Haulge',t.xField) > 0 时的情况

substring( t.xField , charindex('Haulge',t.xField) + 8,case when charindex(';',substring( t.xField , charindex('Haulge',t.xField) + 8,LEN(t.xField) xField))) = 0 然后 LEN(t.xField) else charindex(';',substring( t.xField , charindex('Haulge',t.xField) + 8,LEN(t.xField)))-1 结束) else '-' end [Haul Price] , case when charindex('Tipton',t.xField) > 0 then

substring( t.xField , charindex('TipTon',t.xField) + 8,case when charindex(';',substring( t.xField , charindex('Tipton',t.xField) + 8,LEN(t. xField))) = 0 然后 LEN(t.xField) else charindex(';',substring( t.xField , charindex('Tipton',t.xField) + 8,LEN(t.xField)))-1 结束) else '-' end [Tip Price] , case when charindex('AItmPr',t.xField) > 0 then

substring( t.xField , charindex('AItmPr',t.xField) + 8,case when charindex(';',substring( t.xField , charindex('AItmPr',t.xField) + 8,LEN(t.xField) xField))) = 0 然后 LEN(t.xField) else charindex(';',substring( t.xField , charindex('AItmPr',t.xField) + 8,LEN(t.xField)))-1 结束) else '-' end [额外价格]