Documentation Home
MySQL 5.7 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 35.0Mb
PDF (A4) - 35.1Mb
Man Pages (TGZ) - 255.4Kb
Man Pages (Zip) - 360.2Kb
Info (Gzip) - 3.4Mb
Info (Zip) - 3.4Mb
Excerpts from this Manual

MySQL 5.7 Reference Manual  /  ...  /  String Collating Support for Complex Character Sets

10.13.2 String Collating Support for Complex Character Sets

For a simple character set named MYSET, sorting rules are specified in the MYSET.xml configuration file using <map> array elements within <collation> elements. If the sorting rules for your language are too complex to be handled with simple arrays, you must define string collating functions in the ctype-MYSET.c source file in the strings directory.

The existing character sets provide the best documentation and examples to show how these functions are implemented. Look at the ctype-*.c files in the strings directory, such as the files for the big5, czech, gbk, sjis, and tis160 character sets. Take a look at the MY_COLLATION_HANDLER structures to see how they are used. See also the CHARSET_INFO.txt file in the strings directory for additional information.