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SpringBoot树形结构查询 SpringBoot+MyBatisPlus+MySQL8实现树形结构查询

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场景:

今天在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<BaoanPrivilege> children;
}

第三步:权限表Mapper 定义

mapper 接口定义

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<BaoanPrivilege> {
 List<BaoanPrivilegeVo> selectList(Map<String, Object> parameter);
 
 IPage<BaoanPrivilegeVo> selectPage(Page page, @Param("vo")Map<String, Object> parameter);
}

mapper.xml 文件定义

<?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.zzg.mapper.BaoanPrivilegeMapper">
  <resultMap id="BaseResultMap" type="com.zzg.entity.BaoanPrivilege">
    <id column="id" jdbcType="VARCHAR" property="id" />
    <result column="privilege_name" jdbcType="VARCHAR" property="privilegeName" />
    <result column="privilege_code" jdbcType="VARCHAR" property="privilegeCode" />
    <result column="pid" jdbcType="VARCHAR" property="pid" />
    <result column="url" jdbcType="VARCHAR" property="url" />
    <result column="order_rank" jdbcType="INTEGER" property="orderRank" />
    <result column="privilege_type" jdbcType="VARCHAR" property="privilegeType" />
    <result column="privilege_description" jdbcType="VARCHAR" property="privilegeDescription" />
    <result column="state" jdbcType="VARCHAR" property="state" />
    <result column="created_by" jdbcType="VARCHAR" property="createdBy" />
    <result column="created_dt" jdbcType="TIMESTAMP" property="createdDt" />
    <result column="version" jdbcType="INTEGER" property="version" />
    <result column="updated_by" jdbcType="VARCHAR" property="updatedBy" />
    <result column="updated_dt" jdbcType="TIMESTAMP" property="updatedDt" />
    <result column="icon_name" jdbcType="INTEGER" property="iconName" />
    <result column="delete_flag" jdbcType="INTEGER" property="deleteFlag" />
  </resultMap>
  
  <resultMap id="BaseResultMapVo" type="com.zzg.vo.BaoanPrivilegeVo" extends="BaseResultMap">
   <collection column="id" property="children" javaType="java.util.ArrayList"
ofType="com.zzg.entity.BaoanPrivilege" select="getNextNodeTree"/>
  </resultMap>
  
  <sql id="Base_Column_List">
    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
  </sql>
  
  <sql id="condition">
   <if test="privilegeType != null and privilegeType != '' ">
    and baoan_privilege.privilege_type = #{privilegeType}
   </if>
   <if test="pid != null and pid != '' ">
    and baoan_privilege.pid = #{pid}
   </if>
  </sql>
  
  <sql id="conditionVo">
   <if test="vo.privilegeType != null and vo.privilegeType != '' ">
    and baoan_privilege.privilege_type = #{vo.privilegeType}
   </if>
   <if test="vo.pid != null and vo.pid != '' ">
    and baoan_privilege.pid = #{vo.pid}
   </if>
  </sql>
  
  <select id="getNextNodeTree" resultMap="BaseResultMapVo">
 SELECT
  <include refid="Base_Column_List"/>
 FROM baoan_privilege
 WHERE pid = #{id}
 </select>
 
 <select id="selectList" parameterType="map" resultMap="BaseResultMapVo">
    select
  <include refid="Base_Column_List"></include>
    FROM baoan_privilege
    WHERE 1 = 1 
    <include refid="condition"></include>
  </select>
  <select id="selectPage" parameterType="map" resultMap="BaseResultMapVo">
    select
  <include refid="Base_Column_List"></include>
    FROM baoan_privilege
    WHERE 1 = 1 
    <include refid="conditionVo"></include>
  </select>
</mapper>

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<BaoanPrivilege> {
 List<BaoanPrivilegeVo> selectList(Map<String, Object> parameter);
 
 IPage<BaoanPrivilegeVo> selectPage(Page<BaoanPrivilegeVo> page, Map<String, Object> 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<BaoanPrivilegeMapper, BaoanPrivilege> implements BaoanPrivilegeService {
 @Autowired
 private BaoanPrivilegeMapper mapper;
 
 @Override
 public List<BaoanPrivilegeVo> selectList(Map<String, Object> parameter) {
  // TODO Auto-generated method stub
  return mapper.selectList(parameter);
 }
 
 @Override
 public IPage<BaoanPrivilegeVo> selectPage(Page<BaoanPrivilegeVo> page, Map<String, Object> 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<String, Object> parame) {
  // 动态构建添加参数
//  QueryWrapper<BaoanPrivilegeVo> query = new QueryWrapper<BaoanPrivilegeVo>();
//  this.buildQuery(parame, query);
 
  PageParame pageParame = this.initPageBounds(parame);
  Page<BaoanPrivilegeVo> page = new Page<BaoanPrivilegeVo>(pageParame.getPage(), pageParame.getLimit());
  IPage<BaoanPrivilegeVo> list = baoanPrivilegeService.selectPage(page, parame);
  return Result.ok().setDatas(list);
 }

前端效果展示:

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