MyBatis如何进行双重foreach循环
作者：harden_no1
这篇文章主要介绍了MyBatis如何进行双重foreach循环，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
进行双重foreach循环
mapname是一个Map<String,Map<String,Object>> 对象
<foreach collection="mapname" index="key1" item="value1" separator=",">
<foreach collection="value1" index="key2" item="value2" separator=",">
#{key1},
#{key2},
#{value2}
</foreach>
</foreach>使用场景
比如说一个付款人下面对应的运单的金额，那么key1就是付款人编号，key2是运单编号，value2是分摊的金额
mybatis foreach循环,传入多个参数
上代码
controller：
@RequestMapping(value = "/findPage", method = RequestMethod.POST)
@ResponseBody
public Object findPage(@RequestParam(required=false) String jobCategory,@RequestParam(required=false) String ids,@RequestParam(required=false) String cities) {
try {
List<Integer> listJob = new ArrayList<Integer>();
List<Integer> listIds = new ArrayList<Integer>();
List<String> listCities = new ArrayList<String>();
//按照城市名称和工种查询
if(StringUtils.isNotBlank(jobCategory) && StringUtils.isNotBlank(cities)){
String[] temp = jobCategory.split(",");
String[] cityTemp = cities.split(",");
for(int i=0;i<temp.length;i++){
listJob.add(Integer.valueOf(temp[i]));
}
for(int i=0;i<cityTemp.length;i++){
listCities.add(cityTemp[i]);
}
List<WebsitesJob> list = jobService.findPage(listJob, listIds, listCities);
return new ExtGridReturn(list.size(), list);
}
//按照工种查询
if(StringUtils.isNotBlank(jobCategory)){
String[] temp = jobCategory.split(",");
for(int i=0;i<temp.length;i++){
listJob.add(Integer.valueOf(temp[i]));
}
}
//按照职位名称查询
if(StringUtils.isNotBlank(ids)){
String[] temp = ids.split(",");
for(int i=0;i<temp.length;i++){
listIds.add(Integer.valueOf(temp[i]));
}
}
//按照城市查询
if(StringUtils.isNotBlank(cities)){
String[] temp = cities.split(",");
for(int i=0;i<temp.length;i++){
listCities.add(temp[i]);
}
}
List<WebsitesJob> list = jobService.findPage(listJob, listIds, listCities);
return new ExtGridReturn(list.size(), list);
} catch (Exception e) {
LOGGER.error("分页获取信息出错", e);
return new ExceptionReturn(e);
}
}mapper
/**
* 描述：根据工种查询列表
* @param jobCategorys
* @return
*/
List<WebsitesJob> findPage(@Param("jobCategorys") List<Integer> jobCategorys,@Param("ids") List<Integer> ids,@Param("workPlace") List<String> workPlace);xml
<!-- 前台查询列表 -->
<select id="findPage" resultType="cn.edu.hbcf.plugin.websites.pojo.WebsitesJob">
select n.ID id,
n.NAME name,
n.WORKPLACE workPlace,
n.JOBCATEGORY jobCategory,
n.SALARY salary,
n.RESPONSIBILITIES responsibilities,
n.REQUIREMENTS requirements,
n.ISHOT isHot,
n.UPDATEDATE updateDate,
n.UPDATEUSER updateUser,
u.real_name updateName
from websites_job n
left join base_users u on n.updateUser = u.account
<where>
<if test="jobCategorys.size()!=0">
or n.jobCategory in
<foreach collection="jobCategorys" index="index" item="item" open="(" separator="," close=")">
#{item}
</foreach>
</if>
<if test="ids.size()!=0">
or n.id in
<foreach collection="ids" item="item" index="index" open="(" separator="," close=")">
#{item}
</foreach>
</if>
<if test="workPlace.size()!=0">
or n.WORKPLACE in
<foreach collection="workPlace" item="item" index="index" open="(" separator="," close=")">
#{item}
</foreach>
</if>
</where>
order by n.ISHOT,n.ID desc
</select>以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。