oralce的序列转换成mysql

-- Create sequence 
create sequence CHATACTIVITY_SEQ
minvalue 1
maxvalue 9999999999999999999999999999
start with 4583
increment by 1

cache 20;

mysql   先创建 一个表

BEGIN 
    REPLACE INTO chatactivity_seq(stub) VALUES ('a');
    RETURN (SELECT LAST_INSERT_ID() from dual);
END