CREATE TABLE `tb_key_sequence` (
                               `seq_name` varchar(3) NOT NULL COMMENT '시퀀스 prefix',
                               `seq_no` int NOT NULL COMMENT '시퀀스 no',
                               PRIMARY KEY (`seq_name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='tb_key_sequence';



CREATE FUNCTION `fn_get_key_seq`(`p_seq_name` VARCHAR(3), `p_key_length` int)
    RETURNS varchar(20) CHARSET utf8
BEGIN
    DECLARE RTN_VAL VARCHAR(20);

    INSERT INTO tb_key_sequence (seq_name, seq_no)
    values (p_seq_name, LAST_INSERT_ID(1))
    ON DUPLICATE KEY UPDATE seq_no=LAST_INSERT_ID(seq_no+1);

    set @ret = row_count();

    if @ret = 0 then
        set RTN_VAL = '0';
    else
        SET RTN_VAL = (SELECT TRIM(CONCAT(p_seq_name,  LPAD(LAST_INSERT_ID(),p_key_length,'0'))));
    end if;

    RETURN RTN_VAL;
END ;