mybatis 对oracle 批量插入操作

<insert id="insertBatch" parameterType="java.util.List">
??insert into SYS_ROLE2FUNCTION (ID,FUNCTIONID, ROLEID)
??<foreach collection="list" item="item" index="index"
???separator=" UNION ALL ">
???SELECT #{item.id,jdbcType=DECIMAL},#{item.functionid,jdbcType=DECIMAL}, #{item.roleid,jdbcType=DECIMAL} FROM DUAL? ???
??</foreach>
?</insert>