我在Play Framework 2.3.6

Java项目中使用MyBatis 3.2.8.我已经挣扎了几天,迭代遍历复杂对象参数中的MyBatis映射器的整数列表.这是我的设置：

我在EventFilter.java中有一个名为EventFilter的类：

public class EventFilter {

private String beginDate;

private String endDate;

private List closestCountry;

private List territorialWaterStatus;

private List vesselCountry;

private String closestCountryInClause;

private String territorialWaterStatusInClause;

private String vesselCountryInClause;

public EventFilter() { }

public EventFilter(JsonNode jsonNode){

this.beginDate = jsonNode.get("beginDate").asText();

this.endDate = jsonNode.get("endDate").asText();

this.closestCountry = JsonHelper.arrayNodeToIntegerList((ArrayNode) jsonNode.get("closestCountry"));

this.territorialWaterStatus = JsonHelper.arrayNodeToIntegerList((ArrayNode) jsonNode.get("territorialWaterStatus"));

this.vesselCountry = JsonHelper.arrayNodeToIntegerList((ArrayNode) jsonNode.get("vesselCountry"));

}

public String getBeginDate() {

return beginDate;

}

public void setBeginDate(String beginDate) {

this.beginDate = beginDate;

}

public String getEndDate() {

return endDate;

}

public void setEndDate(String endDate) {

this.endDate = endDate;

}

public List getTerritorialWaterStatus() {

if(this.territorialWaterStatus.size() > 0) {

return territorialWaterStatus;

} else {

return null;

}

}

public void setTerritorialWaterStatus(List territorialWaterStatus) {

this.territorialWaterStatus = territorialWaterStatus;

}

public List getClosestCountry() {

if(this.closestCountry.size() > 0) {

return closestCountry;

} else {

return null;

}

}

public void setClosestCountry(List closestCountry) {

this.closestCountry = closestCountry;

}

public List getVesselCountry() {

if(this.vesselCountry.size() > 0) {

return vesselCountry;

} else {

return null;

}

}

public void setVesselCountry(List vesselCountry) {

this.vesselCountry = vesselCountry;

}

}

这在我的mybatis配置文件中被引用为类型别名：

我有一个mapper,它以EventFilter对象作为参数.然后应检查是否设置了beginDate,endDate,nearestCountry,vesselCountry和territorialWaterStatus.如果是,它将它们用于WHERE子句：

SELECT ev.id, to_char(ev.occurred_on, 'YYYY-MM-DD') AS occurred_on_date,

to_char(ev.occurred_on, 'HH24:MI:SS') AS occurred_on_time,

ST_X(ev.location) AS longitude, ST_Y(ev.location) AS latitude,

COALESCE(co01.name, 'Unspecified') AS closest_country,

COALESCE(co02.name, 'Unspecified') AS territorial_water_status,

COALESCE(co03.name, 'Unspecified') AS vessel_flag_country

FROM event AS ev

LEFT JOIN country AS co01

ON co01.cow_id = ev.location_closest_country_id

LEFT JOIN country AS co02

ON co02.cow_id = ev.location_water_status_country_id

LEFT JOIN country AS co03

ON co03.cow_id = ev.vessel_flag_country_id

ev.occurred_on >= #{eventFilter.beginDate}::timestamp AND ev.occurred_on <= #{eventFilter.endDate}::timestamp

AND ev.location_closest_country_id IN

#{id}

AND ev.location_water_status_country_id IN

#{id}

AND ev.vessel_flag_country_id IN

#{id}

ORDER BY ev.occurred_on ASC;

我将映射器链接到一个接口,如下所示：

public List getEventsWithFilter(@Param("eventFilter") EventFilter eventFilter);

我用MybatisMapper辅助类调用它来生成我的会话,如下所示：

public static List getEvents(EventFilter eventFilter) {

MybatisMapper mapper = new MybatisMapper();

SqlSession session = mapper.getSession();

EventMapper eventMapper = session.getMapper(EventMapper.class);

List events;

List li = eventFilter.getClosestCountry();

try {

events = eventMapper.getEventsWithFilter(eventFilter);

} finally {

session.close();

}

return events;

}

问题：

beginDate和endDate自己完全正常工作.但是我对整数列表有以下问题：

>检查列表是否为null的if语句似乎正在获取

忽略,或当它应该是假时评估为true.

>整数列表似乎作为null传递给IN子句.

>如果我注释掉整数列表IN子句,并且只是为了beginDate和

endDate,它完全正常.但是,如果我留下整数

列表IN子句,查询不会失败,但它返回一个空

设置,好像要说“WHERE列IN()”.

这是执行映射器/查询时由Play和Mybatis打印的控制台日志记录,以及EventFilter打印其内容.它们有点冗长所以我把它们放在pastebin中：

这比我想要的要长一点,但提前感谢任何帮助或建议.