在oracle中创建序列语句并执行：
create
sequence
user_seq start
with
1 increment
by
1;create or replace trigger user_trigger
before insert on tb_user
for each row
begin
select user_seq.nextval into :new.id from dual;
end ;2.然后在mybatis的mapper配置文件中插入一条记录时就不用指定id
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.cn.mapper.UserMapper">
<insert id="save" parameterType="com.cn.domain.User" useGeneratedKeys="true">
INSERT INTO TB_USER(name,sex,age) VALUES(#{name},#{sex},${age})
</insert>
</mapper>
