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在oracle中创建序列语句并执行：
create sequence user_seq start with 1 increment by 1;
在oracle创建触发器语句并执行：
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>
