Get the Whitepaper called Bulk SQL Injection Test on Burp Requests.
You can download it from the following link: https://packetstormsecurity.com/files/download/149420/bulk-sql-injection-using-burp-to-sqlmap.pdf
Source: https://packetstormsecurity.com/files/149420/Bulk-SQL-Injection-Test-On-Burp-Requests.html