Jest to ogólna funkcja do przetworzenia dowolnego ciągu tekstowego na tabelę wartości... Możesz jej łatwo użyć do wykonania tego, co próbujesz osiągnąć:
ALTER FUNCTION [dbo].[ParseTextString] (@S Text, @delim VarChar(5))
Returns @tOut Table
(ValNum Integer Identity Primary Key,
sVal VarChar(8000))
As
Begin
Declare @dLLen TinyInt -- Length of delimiter
Declare @sWin VarChar(8000) -- Will Contain Window into text string
Declare @wLen Integer -- Length of Window
Declare @wLast TinyInt -- Boolean to indicate processing Last Window
Declare @wPos Integer -- Start Position of Window within Text String
Declare @sVal VarChar(8000) -- String Data to insert into output Table
Declare @BtchSiz Integer -- Maximum Size of Window
Set @BtchSiz = 7900 -- (Reset to smaller values to test routine)
Declare @dPos Integer -- Position within Window of next Delimiter
Declare @Strt Integer -- Start Position of each data value within Window
-- -------------------------------------------------------------------------
If @delim is Null Set @delim = '|'
If DataLength(@S) = 0 Or
Substring(@S, 1, @BtchSiz) = @delim Return
-- ---------------------------
Select @dLLen = Len(@delim),
@Strt = 1, @wPos = 1,
@sWin = Substring(@S, 1, @BtchSiz)
Select @wLen = Len(@sWin),
@wLast = Case When Len(@sWin) = @BtchSiz
Then 0 Else 1 End,
@dPos = CharIndex(@delim, @sWin, @Strt)
-- ------------------------------------
While @Strt <= @wLen
Begin
If @dPos = 0 -- No More delimiters in window
Begin
If @wLast = 1 Set @dPos = @wLen + 1
Else
Begin
Set @wPos = @wPos + @Strt - 1
Set @sWin = Substring(@S, @wPos, @BtchSiz)
-- ----------------------------------------
Select @wLen = Len(@sWin), @Strt = 1,
@wLast = Case When Len(@sWin) = @BtchSiz
Then 0 Else 1 End,
@dPos = CharIndex(@delim, @sWin, 1)
If @dPos = 0 Set @dPos = @wLen + 1
End
End
-- -------------------------------
Set @sVal = LTrim(Substring(@sWin, @Strt, @dPos - @Strt))
Insert @tOut (sVal) Values (@sVal)
-- -------------------------------
-- Move @Strt to char after last delimiter
Set @Strt = @dPos + @dLLen
Set @dPos = CharIndex(@delim, @sWin, @Strt)
End
Return
End
