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Part 2: The 32-Bit/64-Bit Drivers : The MySQL Wire Protocol Driver : Unicode Support
  
Unicode Support
When the character set of a character column is Unicode, then the MySQL Wire Protocol driver maps the MySQL data type to Unicode data type as follows:
MySQL Data Type
Mapped to. . .
CHAR
SQL_WCHAR
LONGTEXT
SQL_WLONGVARCHAR
MEDIUMTEXT
SQL_WLONGVARCHAR
TEXT
SQL_WLONGVARCHAR
TINYTEXT
SQL_WLONGVARCHAR
VARCHAR
SQL_WVARCHAR