[Ur] "Fatal error: Non-printable character 4294967248 in string to SQLify"

[Adam Chlipala]

Alexei Golovko wrote:
> What does "Fatal error: Non-printable character 4294967248 in string to SQLify" mean and how can I localize it?
>    

That's coming from the runtime function to escape strings for inclusion 
as literals in SQL code.  When I look at that code now, my conclusion is 
that this error message is basically a placeholder saying "figure out 
the right way to include such characters in literals for MySQL and 
SQLite."  The current code uses a Postgres escape sequence if that's the 
selected DBMS, and raises the error otherwise.

Does anyone know the proper way to include extended UTF-8 characters in 
MySQL/SQLite string literals?  Perhaps it's just a matter of dropping 
them in, which would still require some care to avoid code injection 
vulnerabilities.