多表形成树形结构：

package com.js.archive.assistant.domain.vo;import com.js.core.domain.vo.BaseVO;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import lombok.EqualsAndHashCode;import java.util.List;/*** <p>* 	 VO* </p>** @author js* @date 2024-1-18* @since JDK 1.8*/@ApiModel(value="库位号选择对象", description="")
@EqualsAndHashCode(callSuper = true)
@Data
public class ArchiveLocationNumVO extends BaseVO {private static final long serialVersionUID = 1L;@ApiModelProperty(value = "id")private Long dataId;@ApiModelProperty(value = "编号")private String code;@ApiModelProperty(value = "名称")private String name;@ApiModelProperty(value = "父id")private Long parentId;@ApiModelProperty(value = "节点等级")private Integer level;@ApiModelProperty(value = "子节点")private List<ArchiveLocationNumVO> children;
}

/*** 获取登录者全宗下的智慧库房** @return List<BizArchiveFloorVO>*/public List<ArchiveLocationNumVO> getAllFloorInfo() {List<ArchiveLocationNumVO> archiveLocationNumVOList = new ArrayList<>();//---------------------------------获取每张表的数据------------------------------------------------        Long archiveCompanyId = ThreadLocalUtil.getArchiveCompanyId();List<KfWarehouse> kfWarehouseList = kfWarehouseService.lambdaQuery().eq(BaseEntity::getArchiveCompanyId, archiveCompanyId).list();List<KfArea> bizArchiveCabinetList = kfAreaService.lambdaQuery().eq(BaseEntity::getArchiveCompanyId, archiveCompanyId).list();List<KfColumn> bizArchiveFloorList = kfColumnService.lambdaQuery().eq(BaseEntity::getArchiveCompanyId, archiveCompanyId).list();List<KfLayerSection> kfLayerSectionList = kfLayerSectionService.lambdaQuery().eq(BaseEntity::getArchiveCompanyId, archiveCompanyId).list();
//----------------------------------------------------------------------------------------------------//开始从最外层开始循环查询if (CollectionUtil.isNotEmpty(kfWarehouseList)) {kfWarehouseList.forEach(bizArchiveRoom -> {//库房1级List<ArchiveLocationNumVO> cabinetArchiveLocationNumList = new ArrayList<>();ArchiveLocationNumVO archiveLocationNumVO = new ArchiveLocationNumVO();archiveLocationNumVO.setParentId(0L);archiveLocationNumVO.setLevel(1);archiveLocationNumVO.setDataId(bizArchiveRoom.getId());archiveLocationNumVO.setCode(String.valueOf(bizArchiveRoom.getKfSerialno()));archiveLocationNumVO.setName(bizArchiveRoom.getKfName());if (CollectionUtil.isNotEmpty(bizArchiveCabinetList)) {//库区2级bizArchiveCabinetList.forEach(bizArchiveCabinet -> {if (bizArchiveRoom.getId() == bizArchiveCabinet.getWarehouseId()) {List<ArchiveLocationNumVO> archiveFloorList = new ArrayList<>();ArchiveLocationNumVO cabinetArchiveLocationNumVO = new ArchiveLocationNumVO();cabinetArchiveLocationNumVO.setParentId(bizArchiveCabinet.getWarehouseId());cabinetArchiveLocationNumVO.setLevel(2);cabinetArchiveLocationNumVO.setDataId(bizArchiveCabinet.getId());cabinetArchiveLocationNumVO.setCode(bizArchiveCabinet.getKqCode());cabinetArchiveLocationNumVO.setName(bizArchiveCabinet.getKqName());if (CollectionUtil.isNotEmpty(bizArchiveFloorList)) {//库列3级bizArchiveFloorList.forEach(bizArchiveFloor -> {if (bizArchiveCabinet.getId() == bizArchiveFloor.getAreaId()) {List<ArchiveLocationNumVO> kfColumnList = new ArrayList<>();ArchiveLocationNumVO kfColumnNumVO = new ArchiveLocationNumVO();kfColumnNumVO.setParentId(bizArchiveFloor.getAreaId());kfColumnNumVO.setLevel(3);kfColumnNumVO.setDataId(bizArchiveFloor.getId());kfColumnNumVO.setCode(String.valueOf(bizArchiveFloor.getKlSerialno()));kfColumnNumVO.setName(bizArchiveFloor.getKlName());if (CollectionUtil.isNotEmpty(kfLayerSectionList)) {//层节4级kfLayerSectionList.forEach(kfLayerSection -> {if (bizArchiveFloor.getId() == kfLayerSection.getColumnId()) {ArchiveLocationNumVO floorArchiveLocationNumVO = new ArchiveLocationNumVO();floorArchiveLocationNumVO.setParentId(kfLayerSection.getColumnId());floorArchiveLocationNumVO.setLevel(4);floorArchiveLocationNumVO.setDataId(kfLayerSection.getId());floorArchiveLocationNumVO.setName(kfLayerSection.getPositionTrans());kfColumnList.add(floorArchiveLocationNumVO);}});}kfColumnNumVO.setChildren(kfColumnList);archiveFloorList.add(kfColumnNumVO);}});}cabinetArchiveLocationNumVO.setChildren(archiveFloorList);cabinetArchiveLocationNumList.add(cabinetArchiveLocationNumVO);}});}archiveLocationNumVO.setChildren(cabinetArchiveLocationNumList);archiveLocationNumVOList.add(archiveLocationNumVO);});}return archiveLocationNumVOList;}

{"code":0,"msg":null,"data":[{"id":null,"dataId":"1","code":"1","name":"1号库房1","parentId":"0","level":1,"children":[{"id":null,"dataId":"1","code":"1-1","name":"1库区","parentId":"1","level":2,"children":[{"id":null,"dataId":"1","code":"1","name":"1列","parentId":"1","level":3,"children":[{"id":null,"dataId":"1","code":null,"name":"1库区1列左面2节号2层号","parentId":"1","level":4,"children":null}]},{"id":null,"dataId":"2","code":"2","name":"2列","parentId":"1","level":3,"children":[{"id":null,"dataId":"2","code":null,"name":"2库区2列右面1节号2层号","parentId":"2","level":4,"children":null}]},{"id":null,"dataId":"3","code":"3","name":"3列","parentId":"1","level":3,"children":[]}]},{"id":null,"dataId":"2","code":"1-2","name":"2库区","parentId":"1","level":2,"children":[{"id":null,"dataId":"4","code":"4","name":"4列","parentId":"2","level":3,"children":[]},{"id":null,"dataId":"5","code":"5","name":"5列","parentId":"2","level":3,"children":[]}]},{"id":null,"dataId":"3","code":"1-21","name":"1-21","parentId":"1","level":2,"children":[{"id":null,"dataId":"6","code":"1","name":"1列","parentId":"3","level":3,"children":[]}]},{"id":null,"dataId":"4","code":"1-3","name":"3库区","parentId":"1","level":2,"children":[]},{"id":null,"dataId":"5","code":"1-4","name":"1-4","parentId":"1","level":2,"children":[]},{"id":null,"dataId":"6","code":"1-5","name":"1-5","parentId":"1","level":2,"children":[]},{"id":null,"dataId":"7","code":"1-6","name":"6库区","parentId":"1","level":2,"children":[]}]},{"id":null,"dataId":"2","code":"2","name":"2号库房11","parentId":"0","level":1,"children":[]},{"id":null,"dataId":"3","code":"3","name":"3号库房","parentId":"0","level":1,"children":[]},{"id":null,"dataId":"4","code":"4","name":"4号库房","parentId":"0","level":1,"children":[]},{"id":null,"dataId":"5","code":"5","name":"5号库房","parentId":"0","level":1,"children":[]},{"id":null,"dataId":"6","code":"6","name":"6号库房修该","parentId":"0","level":1,"children":[]},{"id":null,"dataId":"7","code":"7","name":"7号库房","parentId":"0","level":1,"children":[]}]}