mybatis + oracle 自增 结合navicate

1、navicate建表

//T_USER表建立序列T_USER_SQ
CREATE SEQUENCE T_USER_SQ
INCREMENT BY
NOMAXVALUE
NOCYCLE
CACHE ;
//语句
select T_USER_SQ.nextval from dual
insert into T_USER(USER_ID,USER_NAME,USER_AGE) values(T_USER_SQ.nextval,'zhangjinjie','');

//oracle自增序列
CREATE SEQUENCE SC_STATISTICS_SQ
// 每次加几个
INCREMENT BY
//不设置最大值
NOMAXVALUE
//不循环
NOCYCLE
CACHE ;
DROP SEQUENCE SC_STATISTICS_SQ;//删除序列

2、mybatis写法

    <insert id="addNote" parameterType="com.sunyard.bigdata.pojo.Note">
            <selectKey keyProperty="userId" resultType="int" order="BEFORE">
                select T_USER_SQ.nextval from dual
            </selectKey>
            insert into T_USER(USER_ID,USER_NAME,USER_AGE) values(#{userId},#{userName},#{userAge})
        </insert>
    <insert id="addNote1" parameterType="com.sunyard.bigdata.pojo.Note">
        <selectKey keyProperty="userId" resultType="int" order="AFTER">
            select T_USER_SQ.CURRVAL AS USER_ID from dual
        </selectKey>
        insert into T_USER(USER_ID,USER_NAME,USER_AGE) values(T_USER_SQ.NEXTVAL,#{userName},#{userAge})
    </insert>