我在尝试使用mybatis读取大型结果集时遇到oom错误。mybatis版本3.5我想在游标上迭代，而不是加载整个查询结果。有没有人有一个从mybatis select返回光标而不是返回整个结果的工作示例。

[java] SEVERE:Memory usage is low, parachute is non existent, your system may start failing.
[java] java.lang.OutOfMemoryError: Java heap space
[java] AsyncLogger error handling event seq=0, value='null':
[java] java.lang.OutOfMemoryError: Java heap space
[java] 06 Sep 2020 05:34:34,682 [ERROR]  (http-nio-0.0.0.0-8243-ClientPoller-1) org.apache.tomcat.util.net.NioEndpoint:
[java] java.lang.OutOfMemoryError: Java heap space
[java]  at java.util.Collections$UnmodifiableCollection.iterator(Collections.java:1043) ~[?:?]
[java]  at org.apache.tomcat.util.net.NioEndpoint$Poller.timeout(NioEndpoint.java:1471) ~[Bobcat-2.2.jar:?]
[java]  at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:1265) ~[Bobcat-2.2.jar:?]
[java]  at java.lang.Thread.run(Thread.java:834) [?:?]

readerdao.xml文件

<select id="downloadelements" resultMap="elementMap">
    select *
    from sample_table
    where element_timestamp between #{startTime} and #{endTime}
    and status=#{status}
</select>

readerdao.java文件

public interface ReaderDao {
Cursor<Element> downloadElements(final @NotNull @Param("startTime") ZonedDateTime startTime,
                                                final @NotNull @Param("endTime") ZonedDateTime endTime,
                                                final @NotNull @Param("status") String status);
}

数据库：aurora postgresql

Cursor<Element> elementList = downloadElements(start, end, status);
Iterator<Element> elementIterator = elementList.iterator();
while (elementIterator.hasNext()) {
    Element element = ElementIterator.next();
    log.info(element.toString());
}

<resultMap id="elementMap" type="Element">
    <constructor>
        <arg javaType="String" column="status"/>
        <arg javaType="java.time.ZonedDateTime" column="start_time"/>
        <arg javaType="java.util.Optional" jdbcType="TIMESTAMP"  column="end_time"/>
    </constructor>
</resultMap>