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