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由 Ryuta Kamizono 提交于
MySQL unicode support is not only `utf8mb4`. Then, The index length problem is not only `utf8mb4`. http://dev.mysql.com/doc/refman/5.6/en/charset-unicode.html SELECT * FROM information_schema.character_sets WHERE maxlen > 3; +--------------------+----------------------+------------------+--------+ | CHARACTER_SET_NAME | DEFAULT_COLLATE_NAME | DESCRIPTION | MAXLEN | +--------------------+----------------------+------------------+--------+ | utf8mb4 | utf8mb4_general_ci | UTF-8 Unicode | 4 | | utf16 | utf16_general_ci | UTF-16 Unicode | 4 | | utf16le | utf16le_general_ci | UTF-16LE Unicode | 4 | | utf32 | utf32_general_ci | UTF-32 Unicode | 4 | +--------------------+----------------------+------------------+--------+
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