一：数据表与实体类

数据表

DROP TABLE IF EXISTS `security_edu_info_type`;
CREATE TABLE `security_edu_info_type` (`id` bigint(20) NOT NULL AUTO_INCREMENT,`keyName` char(12) DEFAULT NULL COMMENT 'key名称',`valueName` char(64) DEFAULT NULL COMMENT '值名称',`stage` char(32) DEFAULT NULL COMMENT '读书的年级或阶段',`stageType` int(1) DEFAULT NULL,`fieldType` char(64) DEFAULT NULL COMMENT '字段类型 1=currentStudy 2=educationType',`description` char(64) DEFAULT NULL COMMENT '描述',PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=389 DEFAULT CHARSET=utf8 COMMENT='用户 - 教育背景 - 字段区分表（对currentStudy、educationType进行区分）';-- ----------------------------
-- Records of security_edu_info_type
-- ----------------------------
INSERT INTO `security_edu_info_type` VALUES ('364', '1', '7年级', '高中', '1', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('365', '2', '8年级', '高中', '1', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('366', '3', '9年级', '高中', '1', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('367', '4', '10年级', '高中', '1', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('368', '5', '11年级', '高中', '1', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('369', '6', '12年级', '高中', '1', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('370', '7', '大一', '本科', '2', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('371', '8', '大二', '本科', '2', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('372', '9', '大三', '本科', '2', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('373', '10', '大四', '本科', '2', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('374', '11', '研一', '研究生', '3', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('375', '12', '研二', '研究生', '3', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('376', '0', '暂无', '博士', '4', 'currentStudy', '目前就读');
INSERT INTO `security_edu_info_type` VALUES ('377', '0', '暂无', '高中', '1', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('378', '1', '国内高中文凭', '本科', '2', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('379', '2', 'IB', '本科', '2', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('380', '3', 'GED', '本科', '2', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('381', '4', 'IGCSE', '本科', '2', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('382', '0', '其他', '本科', '2', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('383', '4', '专科', '研究生', '3', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('384', '5', '本科', '研究生', '3', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('385', '0', '其他', '研究生', '3', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('386', '6', '本科', '博士', '4', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('387', '7', '硕士', '博士', '4', 'educationType', '获得学历类型');
INSERT INTO `security_edu_info_type` VALUES ('388', '0', '其他', '博士', '4', 'educationType', '获得学历类型');

实体类

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;import java.io.Serializable;
import java.util.List;@TableName("security_edu_info_type")
public class EduInfoType implements Serializable {private static final long serialVersionUID = 1L;@TableId(value = "id", type = IdType.AUTO)private Long id;/*** key名称*/@TableField("keyName")private String keyName;@TableField("fieldType")private String fieldType;/*** 值名称*/@TableField("valueName")private String valueName;/*** 阶段名称*/private String stage;/*** 阶段类型*/@TableField("stageType")private String stageType;/*** 说明*/private String description;// 接收resultMap的值@TableField(exist = false)private List<EduInfoType> children;public List<EduInfoType> getChildren() {return children;}public void setChildren(List<EduInfoType> children) {this.children = children;}public static long getSerialVersionUID() {return serialVersionUID;}public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getKeyName() {return keyName;}public void setKeyName(String keyName) {this.keyName = keyName;}public String getValueName() {return valueName;}public void setValueName(String valueName) {this.valueName = valueName;}public String getStage() {return stage;}public void setStage(String stage) {this.stage = stage;}public String getStageType() {return stageType;}public void setStageType(String stageType) {this.stageType = stageType;}public String getDescription() {return description;}public void setDescription(String description) {this.description = description;}public String getFieldType() {return fieldType;}public void setFieldType(String fieldType) {this.fieldType = fieldType;}
}

二：mapper与mapper.xml

mapper

mport com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.business.app.entities.EduInfoType;
import org.apache.ibatis.annotations.Mapper;import java.util.List;@Mapper
public interface EduInfoTypeMapper extends BaseMapper<EduInfoType> {List<EduInfoType> selectEduInfoTypeList(String fieldType);}

mapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.business.app.mapper.EduInfoTypeMapper"><resultMap id="baseResult" type="com.business.app.entities.EduInfoType"><result property="stageType" column="stageType" /><result property="keyName" column="keyName"/><result property="valueName" column="valueName"/><result property="stage" column="stage"/><collection property="children" ofType="com.business.app.entities.EduInfoType"><id property="id" column="id"/><result property="keyName" column="keyName"/><result property="valueName" column="valueName"/><result property="stage" column="stage"/></collection></resultMap><select id="selectEduInfoTypeList" resultMap="baseResult">SELECTDISTINCT t1.stageType,t1.valueName,t2.id,t2.keyName,t2.valueName,t2.stageFROMsecurity_edu_info_type AS t1LEFT JOIN security_edu_info_type AS t2 ON t1.stageType = t2.stageTypeWHEREt1.fieldType = #{fieldType} and t2.fieldType = #{fieldType}ORDER BYt1.id asc, t2.id asc</select></mapper>

三：service

接口

public interface IEduInfoTypeService {Object selectEduInfoTypeList();
}

接口实现

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.business.app.entities.EduInfoType;
import com.business.app.mapper.EduInfoTypeMapper;
import com.business.app.service.IEduInfoTypeService;
import org.apache.commons.lang.StringUtils;
import org.springframework.stereotype.Service;import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;/*** @author lihaisong* @version 1.0* @date 2021-07-29 14:37*/
@Service
public class EduInfoTypeServiceImpl extends ServiceImpl<EduInfoTypeMapper, EduInfoType> implements IEduInfoTypeService {@Overridepublic Object selectEduInfoTypeList() {//取出list集合某列值，并去重//List<String> newList1 = educationTypeList.stream()//                     .map(EduInfoType::getStage).collect(Collectors.toList());//List<String> educationList = newList1.stream().distinct().collect(Collectors.toList());//System.out.println("输出单号集合："+educationList);String fieldType1 = "currentStudy";List<EduInfoType> currentStudyList = baseMapper.selectEduInfoTypeList(fieldType1);String fieldType2 = "educationType";List<EduInfoType> educationTypeList = baseMapper.selectEduInfoTypeList(fieldType2);Map<String,Object> map = new HashMap<>();map.put("currentStudyList", currentStudyList);map.put("educationTypeList", educationTypeList);return map;}}

四：控制器

@Resource
private IEduInfoTypeService eduInfoTypeService;@ApiOperation("获取教育背景列表")
@GetMapping("/getEduInfoList")
public ApiResponse getEduInfoList(){return ApiResponse.ok(eduInfoTypeService.selectEduInfoTypeList());
}

五：返回结果

{"code":200,"message":"成功","data":{"educationTypeList":[{"id":null,"keyName":"0","fieldType":null,"valueName":"暂无","stage":"高中","stageType":"1","description":null,"children":[{"id":377,"keyName":"0","fieldType":null,"valueName":"暂无","stage":"高中","stageType":null,"description":null,"children":null}]},{"id":null,"keyName":"1","fieldType":null,"valueName":"国内高中文凭","stage":"本科","stageType":"2","description":null,"children":[{"id":378,"keyName":"1","fieldType":null,"valueName":"国内高中文凭","stage":"本科","stageType":null,"description":null,"children":null},{"id":379,"keyName":"2","fieldType":null,"valueName":"IB","stage":"本科","stageType":null,"description":null,"children":null},{"id":380,"keyName":"3","fieldType":null,"valueName":"GED","stage":"本科","stageType":null,"description":null,"children":null},{"id":381,"keyName":"4","fieldType":null,"valueName":"IGCSE","stage":"本科","stageType":null,"description":null,"children":null},{"id":382,"keyName":"0","fieldType":null,"valueName":"其他","stage":"本科","stageType":null,"description":null,"children":null}]},{"id":null,"keyName":"4","fieldType":null,"valueName":"专科","stage":"研究生","stageType":"3","description":null,"children":[{"id":383,"keyName":"4","fieldType":null,"valueName":"专科","stage":"研究生","stageType":null,"description":null,"children":null},{"id":384,"keyName":"5","fieldType":null,"valueName":"本科","stage":"研究生","stageType":null,"description":null,"children":null},{"id":385,"keyName":"0","fieldType":null,"valueName":"其他","stage":"研究生","stageType":null,"description":null,"children":null}]},{"id":null,"keyName":"6","fieldType":null,"valueName":"本科","stage":"博士","stageType":"4","description":null,"children":[{"id":386,"keyName":"6","fieldType":null,"valueName":"本科","stage":"博士","stageType":null,"description":null,"children":null},{"id":387,"keyName":"7","fieldType":null,"valueName":"硕士","stage":"博士","stageType":null,"description":null,"children":null},{"id":388,"keyName":"0","fieldType":null,"valueName":"其他","stage":"博士","stageType":null,"description":null,"children":null}]}],"currentStudyList":[{"id":null,"keyName":"1","fieldType":null,"valueName":"7年级","stage":"高中","stageType":"1","description":null,"children":[{"id":364,"keyName":"1","fieldType":null,"valueName":"7年级","stage":"高中","stageType":null,"description":null,"children":null},{"id":365,"keyName":"2","fieldType":null,"valueName":"8年级","stage":"高中","stageType":null,"description":null,"children":null},{"id":366,"keyName":"3","fieldType":null,"valueName":"9年级","stage":"高中","stageType":null,"description":null,"children":null},{"id":367,"keyName":"4","fieldType":null,"valueName":"10年级","stage":"高中","stageType":null,"description":null,"children":null},{"id":368,"keyName":"5","fieldType":null,"valueName":"11年级","stage":"高中","stageType":null,"description":null,"children":null},{"id":369,"keyName":"6","fieldType":null,"valueName":"12年级","stage":"高中","stageType":null,"description":null,"children":null}]},{"id":null,"keyName":"7","fieldType":null,"valueName":"大一","stage":"本科","stageType":"2","description":null,"children":[{"id":370,"keyName":"7","fieldType":null,"valueName":"大一","stage":"本科","stageType":null,"description":null,"children":null},{"id":371,"keyName":"8","fieldType":null,"valueName":"大二","stage":"本科","stageType":null,"description":null,"children":null},{"id":372,"keyName":"9","fieldType":null,"valueName":"大三","stage":"本科","stageType":null,"description":null,"children":null},{"id":373,"keyName":"10","fieldType":null,"valueName":"大四","stage":"本科","stageType":null,"description":null,"children":null}]},{"id":null,"keyName":"11","fieldType":null,"valueName":"研一","stage":"研究生","stageType":"3","description":null,"children":[{"id":374,"keyName":"11","fieldType":null,"valueName":"研一","stage":"研究生","stageType":null,"description":null,"children":null},{"id":375,"keyName":"12","fieldType":null,"valueName":"研二","stage":"研究生","stageType":null,"description":null,"children":null}]},{"id":null,"keyName":"0","fieldType":null,"valueName":"暂无","stage":"博士","stageType":"4","description":null,"children":[{"id":376,"keyName":"0","fieldType":null,"valueName":"暂无","stage":"博士","stageType":null,"description":null,"children":null}]}]}
}

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Mybatis-plus：单表使用关联查询+ResultMap结果映射

Mybatis-plus：单表使用关联查询+ResultMap结果映射

一：数据表与实体类

二：mapper与mapper.xml

三：service

四：控制器

五：返回结果

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