Sed - Fixing an sql insert stament with single quote in value - sql

Question

I am asked to help with a UNIX script that deploys database objects with or without data from 1 machine and/or environment with another. The problem is that some columns have CHAR data with single quotes. Only these single quotes need to be converted to 2 single quotes. I was thinking of using sed or awk, but I can't figure it out. Anyone got any ideas?
example:
INSERT INTO SQL_ERROR_MESSAGE (SQL_Error_Cd,Error_Text) VALUES (5492,'The argument for an INOUT/OUT parameter '%VSTR' is invalid.');
becomes
INSERT INTO SQL_ERROR_MESSAGE (SQL_Error_Cd,Error_Text) VALUES (5492,'The argument for an INOUT/OUT parameter ''%VSTR'' is invalid.');
Thanks for your support.

Answer 1

If you are rather certain about the format of your INSERT statement, this might work for you:
sed "s/\([^']\+'[^']\+\)\('\)\([^']\+\)'\(.*\)/\1\2\2\3\2\2\4/" INPUTFILE
But I'd recommend to check the output :-)
Basically it captures everything till the second(!) ' (in \1), then captures the 2nd ' (\2) - that's not needed, I just wrote it this way ... -, in \3 the string in between the 's which should be escaped, and finally the remaining part of the string (\4), and uses the saved entries in the replacement.
Exapmle output (Linux, GNU sed):
$ sed "s/\([^']\+'[^']\+\)\('\)\([^']\+\)'\(.*\)/\1\2\2\3\2\2\4/"
INPUT LINE #=> INSERT INTO SQL_ERROR_MESSAGE (SQL_Error_Cd,Error_Text) VALUES (5492,'The argument for an INOUT/OUT parameter '%VSTR' is invalid.');
OUTPUT LINE #=> INSERT INTO SQL_ERROR_MESSAGE (SQL_Error_Cd,Error_Text) VALUES (5492,'The argument for an INOUT/OUT parameter ''%VSTR'' is invalid.');