SELECT `idx`, `file_name`, `real_file_name`, `file_extension` FROM `board_file` WHERE `del_flag`='n' AND `board_data_idx`=

There is an error in the transmitted query.
ERROR_CODE 1064 : You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1

SELECT `idx`, `file_name`, `file_extension` FROM `board_file` WHERE `del_flag`='n' AND `board_data_idx`=

There is an error in the transmitted query.
ERROR_CODE 1064 : You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1

SELECT `idx`, `subject`, `secret_flag`, `add_id` FROM `board_data` WHERE `board_id`='release' AND `del_flag`='n' AND `idx`< ORDER BY `idx` DESC LIMIT 1

There is an error in the transmitted query.
ERROR_CODE 1064 : You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'ORDER BY `idx` DESC LIMIT 1' at line 1

SELECT `idx`, `subject`, `secret_flag`, `add_id` FROM `board_data` WHERE `board_id`='release' AND `del_flag`='n' AND `idx`> ORDER BY `idx` ASC LIMIT 1

There is an error in the transmitted query.
ERROR_CODE 1064 : You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'ORDER BY `idx` ASC LIMIT 1' at line 1