怎么使用SpringBoot+MyBatisPlus+MySQL8实现树形结构查询

场景:

实现权限功能模块时，需要将查询的权限数据，以树形结构的方式返回给前端。

功能实现:

第一步:权限表结构定义及其功能演示数据。

DROP TABLE IF EXISTS `baoan_privilege`;
CREATE TABLE `baoan_privilege`  (
  `id` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '主键',
  `privilege_name` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '权限名称',
  `privilege_code` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '权限编码',
  `pid` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '父Id',
  `url` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '菜单路由',
  `order_rank` int(3) NULL DEFAULT NULL COMMENT '序号',
  `privilege_type` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '权限类型1:项目，2菜单，3按钮',
  `privilege_description` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '权限描述',
  `state` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT '2' COMMENT '状态(1:禁用,2:启用)',
  `created_by` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '创建人',
  `created_dt` datetime(0) NULL DEFAULT NULL COMMENT '创建时间',
  `version` int(9) NULL DEFAULT 1 COMMENT '版本号',
  `updated_by` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '更新人',
  `updated_dt` datetime(0) NULL DEFAULT NULL COMMENT '更新时间',
  `icon_name` int(15) NULL DEFAULT NULL COMMENT '图标名称',
  `delete_flag` int(1) NULL DEFAULT 1 COMMENT '删除标识(1:未删除，2：已删除)',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '权限表' ROW_FORMAT = Dynamic;
 
-- ----------------------------
-- Records of baoan_privilege
-- ----------------------------
INSERT INTO `baoan_privilege` VALUES ('1', '首页', 'A', '0', NULL, NULL, '1', '首页', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('10', '通知管理', 'F_02', '6', NULL, NULL, '2', '通知管理', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('11', '操作日志', 'F_03', '6', NULL, NULL, '2', '操作日志', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('12', '角色管理', 'F_04', '6', NULL, NULL, '2', '角色管理', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('13', '存储管理', 'F_05', '6', NULL, NULL, '2', '存储管理', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('14', '权限管理', 'F_06', '6', NULL, NULL, '2', '权限管理', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('15', '新增', 'F_01_add', '9', NULL, NULL, '3', '管理员新增', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('16', '修改', 'F_01_update', '9', NULL, NULL, '3', '管理员修改', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('17', '查询', 'F_01_search', '9', NULL, NULL, '3', '管理员查询', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('18', '删除', 'F_01_delete', '9', NULL, NULL, '3', '管理员删除', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('19', '导出', 'F_01_export', '9', NULL, NULL, '3', '管理员导出', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('2', '用户管理', 'B', '0', NULL, NULL, '1', '用户管理', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('3', '商场管理', 'C', '0', NULL, NULL, '1', '商场管理', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('4', '商品管理', 'D', '0', NULL, NULL, '1', '商品管理', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('5', '推广管理', 'E', '0', NULL, NULL, '1', '推广管理', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('6', '系统管理', 'F', '0', NULL, NULL, '1', '系统管理', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('7', '配置管理', 'G', '0', NULL, NULL, '1', '配置管理', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('8', '统计报表', 'H', '0', NULL, NULL, '1', '统计报表', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);
INSERT INTO `baoan_privilege` VALUES ('9', '管理员', 'F_01', '6', NULL, NULL, '2', '管理员', '2', NULL, NULL, 1, NULL, NULL, NULL, 1);

第二步:权限表实体定义及其拓展对象

基本对象

package com.zzg.entity;
 
import java.io.Serializable;
import java.util.Date;
 
import com.baomidou.mybatisplus.annotation.TableName;
 
import lombok.Data;
 
@SuppressWarnings("serial")
@TableName(value = "baoan_privilege")
@Data
public class BaoanPrivilege implements Serializable {
 private String id;
 
    private String privilegeName;
 
    private String privilegeCode;
 
    private String pid;
 
    private String url;
 
    private Integer orderRank;
 
    private String privilegeType;
 
    private String privilegeDescription;
 
    private String state;
 
    private String createdBy;
 
    private Date createdDt;
 
    private Integer version;
 
    private String updatedBy;
 
    private Date updatedDt;
 
    private Integer iconName;
 
    private Integer deleteFlag;
}

拓展对象

package com.zzg.vo;
 
import java.util.List;
 
import com.zzg.entity.BaoanPrivilege;
 
import lombok.Data;
 
@SuppressWarnings("serial")
@Data
public class BaoanPrivilegeVo  extends BaoanPrivilege {
 
 private List children;
}

第三步:权限表Mapper 定义

mapper 接口定义

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package com.zzg.mapper;
 
import java.util.List;
import java.util.Map;
 
import org.apache.ibatis.annotations.Param;
 
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.zzg.entity.BaoanPrivilege;
import com.zzg.vo.BaoanPrivilegeVo;
 
public interface BaoanPrivilegeMapper extends BaseMapper {
 List selectList(Map parameter);
 
 IPage selectPage(Page page, @Param("vo")Map parameter);
}

mapper.xml 文件定义

  
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
  
  
  
   
  
  
  
    id, privilege_name, privilege_code, pid, url, order_rank, privilege_type, privilege_description, 
    state, created_by, created_dt, version, updated_by, updated_dt, icon_name, delete_flag
  
  
  
   
    and baoan_privilege.privilege_type = #{privilegeType}
   
   
    and baoan_privilege.pid = #{pid}
   
  
  
  
   
    and baoan_privilege.privilege_type = #{vo.privilegeType}
   
   
    and baoan_privilege.pid = #{vo.pid}
   
  
  
  
 SELECT
  
 FROM baoan_privilege
 WHERE pid = #{id}
 
 
 
    select
  
    FROM baoan_privilege
    WHERE 1 = 1 
    
  
  
    select
  
    FROM baoan_privilege
    WHERE 1 = 1 
    
  

第三步:权限表Service 定义

package com.zzg.service;
 
import java.util.List;
import java.util.Map;
 
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.IService;
import com.zzg.entity.BaoanPrivilege;
import com.zzg.vo.BaoanPrivilegeVo;
 
public interface BaoanPrivilegeService extends IService {
 List selectList(Map parameter);
 
 IPage selectPage(Page page, Map parameter);
}

package com.zzg.service.impl;
 
import java.util.List;
import java.util.Map;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zzg.entity.BaoanPrivilege;
import com.zzg.mapper.BaoanPrivilegeMapper;
import com.zzg.service.BaoanPrivilegeService;
import com.zzg.vo.BaoanPrivilegeVo;
 
@Service
public class BaoanPrivilegeServiceImpl extends ServiceImpl implements BaoanPrivilegeService {
 @Autowired
 private BaoanPrivilegeMapper mapper;
 
 @Override
 public List selectList(Map parameter) {
  // TODO Auto-generated method stub
  return mapper.selectList(parameter);
 }
 
 @Override
 public IPage selectPage(Page page, Map parameter) {
  // TODO Auto-generated method stub
  return mapper.selectPage(page, parameter);
 }
 
}

第四步:controller 层接口对外提供服务

 // 查
 @ApiOperation(httpMethod = "POST", value = "基于分页查询符合条件权限记录")
 @RequestMapping(value = "/getPage", method = { RequestMethod.POST })
 @ApiImplicitParams({
   @ApiImplicitParam(name = "username", value = "管理员名称", required = false, dataType = "String", paramType = "query") })
 public Result getPage(@RequestBody Map parame) {
  // 动态构建添加参数
//  QueryWrapper query = new QueryWrapper();
//  this.buildQuery(parame, query);
 
  PageParame pageParame = this.initPageBounds(parame);
  Page page = new Page(pageParame.getPage(), pageParame.getLimit());
  IPage list = baoanPrivilegeService.selectPage(page, parame);
  return Result.ok().setDatas(list);
 }

前端效果展示: