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2fdb556e04
This patch changes the main name of 3 byte character set from utf8 to utf8mb3. New old_mode UTF8_IS_UTF8MB3 is added and set TRUE by default, so that utf8 would mean utf8mb3. If not set, utf8 would mean utf8mb4.
This directory holds configuration files that enable MySQL to work with
different character sets. It contains:
charset_name.xml
Each charset_name.xml file contains information for a simple character
set. The information in the file describes character types,
lower- and upper-case equivalencies and sorting orders for the
character values in the set.
Index.xml
The Index.xml file lists all of the available charset configurations,
including collations.
Each collation must have a unique number. The number is stored
IN THE DATABASE TABLE FILES and must not be changed.
The max-id attribute of the <charsets> element must be set to
the largest collation number.
Compiled in or configuration file?
When should a character set be compiled in to MySQL's string library
(libmystrings), and when should it be placed in a charset_name.xml
configuration file?
If the character set requires the strcoll functions or is a
multi-byte character set, it MUST be compiled in to the string
library. If it does not require these functions, it should be
placed in a charset_name.xml configuration file.
If the character set uses any one of the strcoll functions, it
must define all of them. Likewise, if the set uses one of the
multi-byte functions, it must define them all. See the manual for
more information on how to add a complex character set to MySQL.
Syntax of configuration files
The syntax is very simple. Words in <map> array elements are
separated by arbitrary amounts of whitespace. Each word must be a
number in hexadecimal format. The ctype array has 257 words; the
other arrays (lower, upper, etc.) take up 256 words each after that.