In this article, I will give information about URL parsing in SQL Server.

In SQL Server you may want to parse the URL in some cases.

Let me explain what I mean. Have a URL address like the one below.

https://www.example.com/?utm_source=google&utm_medium=blabla&utm_campaign=gameuser&utm_term=winwin&utm_content=takego

We will parse this URL address as follows.

You can easily do this using the function below.

CREATE FUNCTION dbo.ParseQueryString (@url NVARCHAR(MAX))
RETURNS @Result TABLE (
	[Name] NVARCHAR(255)
   ,[Value] NVARCHAR(255)
)
AS
BEGIN
	DECLARE @questionIndex INT = charindex('?', @url)
	DECLARE @queryString NVARCHAR(MAX) = NULL
	DECLARE @startPosition INT = 1
	DECLARE @endPosition INT = 1
	DECLARE @name NVARCHAR(255) = NULL
	DECLARE @value NVARCHAR(255) = NULL

	IF @questionIndex > 0
	BEGIN
		SET @queryString = substring(@url, @questionIndex + 1, LEN(@url))
		SET @startPosition = 1
		SET @endPosition = charindex('&', @queryString)

		WHILE @endPosition > 0
		BEGIN
		SET @name = substring(@queryString, @startPosition, charindex('=', @queryString, @startPosition) - @startPosition)
		SET @value = substring(@queryString, charindex('=', @queryString, @startPosition) + 1, @endPosition - charindex('=', @queryString, @startPosition) - 1)
		INSERT INTO @Result ([Name], [Value])
			VALUES (@name, @value)

		SET @startPosition = @endPosition + 1
		SET @endPosition = charindex('&', @queryString, @startPosition)
		END

		SET @name = substring(@queryString, @startPosition, charindex('=', @queryString, @startPosition) - @startPosition)
		SET @value = substring(@queryString, charindex('=', @queryString, @startPosition) + 1, LEN(@queryString) - charindex('=', @queryString, @startPosition))
		INSERT INTO @Result ([Name], [Value])
			VALUES (@name, @value)
	END

	RETURN
END

--Kullanımı

SELECT
	*
FROM dbo.ParseQueryString('https://www.example.com/?utm_source=google&utm_medium=blabla&utm_campaign=gameuser&utm_term=winwin&utm_content=takego')

When you create and run the above function, you will see a result similar to the one below.

As you can see, we have parsed the URL.

Good luck to everyone in business and life.

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