How to insert unknown charset string to MariaDB table in C - mysql

Question

My sample code is..
insert into test set fir='aaa',sec='¿¬ºA¦ µµT °¥µ젰ވ­.alz' (in C)
This string copy&paste to MariaDB prompt, then success.
question
but not work in C code. sec column is NULL. why?
How can I modify this in C code that insert to DB? (It is okay to string is broken.)
MariaDB status...
MariaDB [oops]> status
....
Server characterset: utf8
Db characterset: utf8
Client characterset: utf8
Conn. characterset: utf8
...
MariaDB [oops]> show full columns from test
...
| fir | varchar(255) | utf8_general_ci |
| sec | varchar(255) | utf8_general_ci |
...
thanks.
Ps.
C code is parse character(¿¬ºA¦ µµT °¥µ젰ވ­.alz) in E-Mail
add
MariaDB [oops]> show variables like 'char%';
+--------------------------+-------------------------------+
| Variable_name | Value |
+--------------------------+-------------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /xxxx/mysql/share/charsets/ |
+--------------------------+-------------------------------+
8 rows in set (0.01 sec)
MariaDB [oops]>

Answer 1

The mysql C client often defaults to a latin1 client connection while the mysql command line client adopts the character set of the user's environment.
So my guess would be that if you execute "SHOW VARIABLES LIKE 'char%'" from within your C program, you'll get a row back stating that the client connection is in fact latin1.
Thus, although the charset of your original string is "unknown" to you, it probably contains some multibye character sequences which are being wrongfully encoded as a result of inserting data from a latin1 client connection into a utf8 database/column.
Generally speaking, if you want your data to be unadulterated upon insertion then your client connection character encoding should match that of the database/column.