| Warning | 1366 | Incorrect string value: '\xF0\x9D\x8C\x86' for column 'column_name' at row 1 | MySQL returned a warning message, too: mysql> SHOW WARNINGS The content got truncated at the first astral Unicode symbol, in this case ? - so, attempting to insert foo?bar actually inserted foo instead, resulting in data loss (and possibly introducing security issues see below). Mysql> SELECT column_name FROM database_name.table_name WHERE id = 9001 Query OK, 1 row affected, 1 warning (0.00 sec) Mysql> UPDATE database_name.table_name SET column_name = 'foo?bar' WHERE id = 9001 mysql> SET NAMES utf8 # just to emphasize that the connection charset is set to `utf8` The column I was trying to update had the utf8_unicode_ci collation, and the connection charset was set to utf8. While writing about JavaScript’s internal character encoding, I noticed that there was no way to insert the U 1D306 TETRAGRAM FOR CENTRE ( ?) symbol into the MySQL database behind this site. By using utf8, I’d be able to store any symbol I want in my database - or so I thought. MySQL’s utf8įor a long time, I was using MySQL’s utf8 charset for databases, tables, and columns, assuming it mapped to the UTF-8 encoding described above. This way, UTF-8 is optimized for the common case where ASCII characters and other BMP symbols (whose code points range from U 000000 to U 00FFFF) are used - while still allowing astral symbols (whose code points range from U 010000 to U 10FFFF) to be stored. Symbols with lower numerical code point values are encoded using fewer bytes. UTF-8 is a variable-width encoding it encodes each symbol using one to four 8-bit bytes. (Not all of these Unicode code points have been assigned characters yet, but that doesn’t stop UTF-8 from being able to encode them.) The UTF-8 encoding can represent every symbol in the Unicode character set, which ranges from U 000000 to U 10FFFF. Alternative title: The things we do to store U 1F4A9 PILE OF POO ( ?) correctly.Īre you using MySQL’s utf8 charset in your databases? In this write-up I’ll explain why you should switch to utf8mb4 instead, and how to do it.
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