Suppose that table_1 has three columns named cunicode, csjis, and clatin with the respective corresponding repertoires UNICODE, KANJISJIS, and LATIN. Suppose further that the current client character set is UTF8.
If you submit the following statement, data from all columns goes into the application in the UTF8 form-of-use.
SELECT cunicode, csjis, clatin FROM table_1;
Therefore, the application must use variables declared as mixed single-byte character/multibyte character strings to store the data from the database.