mysql

<insert id="insert" parameterType="Person" useGeneratedKeys="true" keyProperty="id">
        insert into person(name,pswd) values(#{name},#{pswd})
    </insert>

<insert id="insert" parameterType="Person">
        <selectKey keyProperty="id" resultType="long">
            select LAST_INSERT_ID()
        </selectKey>
        insert into person(name,pswd) values(#{name},#{pswd})
    </insert>

oracle

CREATE SEQUENCE  "SEQ_M_USER"

MINVALUE 1

MAXVALUE 9999999999999999999999999999

INCREMENT BY 1 START WITH 501 CACHE 20 ORDER  NOCYCLE ;

1.先通过sequence查出来id，再insert

<insert id=”add” useGeneratedKeys=”false” keyProperty=”id” parameterType=”Person”>

<selectKey resultType=”String”  keyProperty=”id” order=”BEFORE”>

select yoursequence.nextval as id from dual

</selectKey>

insert into Person (id,user_id, user_name) values(#{id},#{userid},#{username})

</insert>

2.直接insertsequence.nextval,如下

<insert id=”add” useGeneratedKeys=”false” keyProperty=”id” parameterType=”Person”>

insert into Person (id,user_id, user_name) values(yoursequence.nextval,#{userid},#{username})

</insert>