mybatis批量插入数据，主键自增长（解决只成功一条问题）

写一个需求，需要批量插入数据，并且主键自增长，开始用了这个语句，可是只能插入一条

<insert id="batchInsert" parameterType="java.util.List"  keyProperty="id">
    insert into score_manage
    (
    `exam_number`,
    `password`,
    `name`,
    `class_and_grade`,
    `semester`,
    `subject`,
    `grade`,
    `score`,
    `deleted`,
    `deleted_time`,
    `tenant_id`,
    `create_user_id`,
    `update_user_id`,
    `create_time`,
    `update_time`
    )
    <foreach collection="list" item="item" index="index" separator="union">
      select
      #{item.examNumber},
      #{item.password},
      #{item.name},
      #{item.classAndGrade},
      #{item.semester},
      #{item.subject},
      #{item.grade},
      #{item.score},
      #{item.deleted},
      #{item.deletedTime},
      #{item.tenantId},
      #{item.createUserId},
      #{item.updateUserId},
      now(),
      now()
      from dual
    </foreach>
  </insert>

后来换了下边这个，成功了

<insert id="batchInsert" parameterType="java.util.List"  keyProperty="id">
    insert into score_manage
    (
    `exam_number`,
    `password`,
    `name`,
    `class_and_grade`,
    `semester`,
    `subject`,
    `grade`,
    `score`,
    `deleted`,
    `deleted_time`,
    `tenant_id`,
    `create_user_id`,
    `update_user_id`,
    `create_time`,
    `update_time`
    )
    values
    <foreach collection="list" item="item" index="index" separator=",">
      (
      #{item.examNumber},
      #{item.password},
      #{item.name},
      #{item.classAndGrade},
      #{item.semester},
      #{item.subject},
      #{item.grade},
      #{item.score},
      #{item.deleted},
      #{item.deletedTime},
      #{item.tenantId},
      #{item.createUserId},
      #{item.updateUserId},
      now(),
      now()
     )
    </foreach>
  </insert>