Stored procedure to parse a string

Question

I need to write a stored procedure for which the input is a string.

The input string contains variable names and their values separated by pipeline delimiter like this:<

Answer 1

I definitely recommend doing your string parsing on the program side as opposed to the data side. That being said, if you absolutely must you can try doing something similar to this:

DECLARE @String [nvarchar](256) = 'Name=Praveen | City=Hyderabad | Mobile=48629387429 | Role=User |'

DECLARE @name [nvarchar](256) = (SELECT SUBSTRING(@String, CHARINDEX('Name=', @String)+5, CHARINDEX('|', @String)))

DECLARE @city [nvarchar](256) = (SELECT SUBSTRING(@String, CHARINDEX('City=', @String)+5, CHARINDEX('|', @String)))

DECLARE @mobile [nvarchar](256) = (SELECT SUBSTRING(@String, CHARINDEX('Mobile=', @String)+7, CHARINDEX('|', @String)))

DECLARE @role [nvarchar](256) = (SELECT SUBSTRING(@String, CHARINDEX('Role=', @String)+5, CHARINDEX('|', @String)))

SELECT RTRIM(LTRIM(LEFT(@name, CHARINDEX('|', @name)-1))) AS Name,
        RTRIM(LTRIM(LEFT(@city, CHARINDEX('|', @city)-1))) AS City,
        RTRIM(LTRIM(LEFT(@mobile, CHARINDEX('|', @mobile)-1))) AS Mobile,
        RTRIM(LTRIM(LEFT(@role, CHARINDEX('|', @role)-1))) AS Role

This returns:

 Name    | City      | Mobile      | Role
________________________________________________
 Praveen | Hyderabad | 48629387429 | User

Note that the length being addedfrom the CHARINDEX in the initial queries are equal to the search string.

"Name=" is equal to 5 characters so we add 5 to move the index past the = sign, "Mobile=" is equal to 7 so we add 7.

Similarly in the end SELECT query we are subtracting 1 from each CHARINDEX to remove the | symbol.

Sources:

SUBSTRING

CHARINDEX

LEFT

LTRIM

RTRIM