Sql Server Split a string to a table using - sql

Question

I have a string : Brand=b1-b2&Vendor=v1-v2-v3&CustomField=cf1-cf2-cf3
I want to make a table..
**Name** | **Value**
------------- | ------
Brand | b1
Brand | b2
Vendor | v1
Vendor | v2
Vendor | v3
CustomField | cf1
CustomField | cf2
CustomField | cf3
Thanks for your help
Edit Note : I tried, but I do not think it's performance
CREATE PROCEDURE [dbo].[SplitTableInStr]
(
#StrParameter NVARCHAR(MAX)
)
AS
BEGIN
DECLARE #Delimiter CHAR = '&',
#Index SMALLINT,
#Start SMALLINT,
#DelSize SMALLINT;
SET #DelSize = LEN(#Delimiter);
CREATE TABLE #FilteredItems
(
[Key] NVARCHAR(400),
[Values] NVARCHAR(MAX)
)
WHILE LEN(#StrParameter) > 0
BEGIN
SET #Index = CHARINDEX(#Delimiter, #StrParameter)
IF #Index = 0
BEGIN
DECLARE #Key NVARCHAR(400) = SUBSTRING(#StrParameter, 1, CHARINDEX('=', #StrParameter) - 1);
DECLARE #Values NVARCHAR(MAX) = SUBSTRING(#StrParameter, CHARINDEX('=', #StrParameter) + 1, LEN(#StrParameter));
INSERT INTO #FilteredItems ([Key],[Values])
VALUES (#Key,#Values)
BREAK
END
ELSE
BEGIN
DECLARE #IndexItem NVARCHAR(MAX) = SUBSTRING(#StrParameter, 1, #Index - 1);
DECLARE #IndexKey NVARCHAR(400) = SUBSTRING(#IndexItem, 1, CHARINDEX('=', #IndexItem) - 1);
DECLARE #IndexValues NVARCHAR(MAX) = SUBSTRING(#IndexItem, CHARINDEX('=', #IndexItem) + 1, LEN(#IndexItem));
INSERT INTO #FilteredItems ([Key],[Values])
VALUES (#IndexKey,#IndexValues)
SET #Start = #Index + #DelSize
SET #StrParameter = SUBSTRING(#StrParameter, #Start , LEN(#StrParameter) - #Start + 1)
END
END
DECLARE #KeyBase NVARCHAR(400),
#ValueBase NVARCHAR(MAX);
CREATE TABLE #DisplayOrderTmp
(
[EndName] NVARCHAR(400),
[EndValue] NVARCHAR(400)
)
WHILE EXISTS(SELECT * From #FilteredItems)
BEGIN
SELECT TOP 1 #KeyBase = [Key], #ValueBase = [Values] FROM #FilteredItems
DECLARE #OptionDelimiter CHAR = '-',
#OptionIndex SMALLINT,
#OptionStart SMALLINT,
#OptionDelSize SMALLINT;
SET #OptionDelSize = LEN(#OptionDelimiter)
WHILE LEN(#ValueBase) > 0
BEGIN
SET #OptionIndex = CHARINDEX(#OptionDelimiter, #ValueBase)
IF #OptionIndex = 0
BEGIN
INSERT INTO #DisplayOrderTmp VALUES (#KeyBase, #ValueBase)
BREAK;
END
ELSE
BEGIN
INSERT INTO #DisplayOrderTmp VALUES (#KeyBase, SUBSTRING(#ValueBase, 1, CHARINDEX(#OptionDelimiter, #ValueBase) - 1))
SET #OptionStart = #OptionIndex + #OptionDelSize
SET #ValueBase = SUBSTRING(#ValueBase, #OptionStart , LEN(#ValueBase) - #OptionStart + 1)
END
END
DELETE #FilteredItems WHERE [Key] = #KeyBase
END
SELECT * FROM #DisplayOrderTmp;
END
EXEC dbo.[SplitTableInStr] 'Brand=b1-b2&Vendor=v1-v2-v3&CustomField=cf1-cf2-cf3'

Answer 1

using a CSV Splitter table valued function by Jeff Moden with cross apply()
declare #s nvarchar(4000) = 'Brand=b1-b2&Vendor=v1-v2-v3&CustomField=cf1-cf2-cf3';
select
Name = left(s.Item,charindex('=',s.Item)-1)
, Value = i.Item
from dbo.DelimitedSplitN4k(#s,'&') s
cross apply dbo.DelimitedSplitN4k(replace(s.Item,'=','-'),'-') i
where i.ItemNumber > 1
rextester demo: http://rextester.com/RTAT28301
returns:
+-------------+------+
| Name | Item |
+-------------+------+
| Brand | b1 |
| Brand | b2 |
| Vendor | v1 |
| Vendor | v2 |
| Vendor | v3 |
| CustomField | cf1 |
| CustomField | cf2 |
| CustomField | cf3 |
+-------------+------+
splitting strings reference:
Tally OH! An Improved SQL 8K “CSV Splitter” Function - Jeff Moden
Splitting Strings : A Follow-Up - Aaron Bertrand
Split strings the right way – or the next best way - Aaron Bertrand
string_split() in SQL Server 2016 : Follow-Up #1 - Aaron Bertrand

Answer 2

I think you should get the best performance with CLR function (in C#) for this purpose:
https://msdn.microsoft.com/en-us/library/ms131103.aspx
You might manually split the input or create compiled Regex with named groups to parse input values.