how to set secure_file_priv in mysql code example

Example 1: show secure-file-priv in mysql by query

SHOW VARIABLES LIKE "secure_file_priv";

Example 2: mysql show variables like secure_file_priv

SHOW VARIABLES;								-- complete list
SHOW VARIABLES LIKE 'secure_file_priv';		-- search
SHOW VARIABLES LIKE 'secure_%';