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.

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