This should be very little surprise. When you print out your SQL string, you will find that the ' in don't is read as terminating the quotes around '$_'. DBI placeholders circumvent the problem.

In reply to Re^2: JSON::XS utf8 formatted string will not load into MYSQL json type column by Corion
in thread JSON::XS utf8 formatted string will not load into MYSQL json type column by misterperl

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