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HomeDatabaseMysql TutorialHow to use SpringBoot+MyBatisPlus+MySQL8 to implement tree structure query

Scenario:

When implementing the permission function module, the queried permission data needs to be returned to the front end in a tree structure.

Function implementation:

Step one:Permission table structure definition and its function demonstration data.

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);

Second step:Permission table entity definition and its extended objects

Basic objects

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;
}

Extended objects

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;
}</baoanprivilege>

Step 3:Permission table Mapper definition

mapper interface definition

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> parameter);
 
 IPage<baoanprivilegevo> selectPage(Page page, @Param("vo")Map<string> parameter);
}</string></baoanprivilegevo></string></baoanprivilegevo></baoanprivilege>

mapper.xml file definition

<?xml  version="1.0" encoding="UTF-8"?>
nbsp;mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper>
  <resultmap>
    <id></id>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
    <result></result>
  </resultmap>
  
  <resultmap>
   <collection oftype="com.zzg.entity.BaoanPrivilege"></collection>
  </resultmap>
  
  <sql>
    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>
   <if>
    and baoan_privilege.privilege_type = #{privilegeType}
   </if>
   <if>
    and baoan_privilege.pid = #{pid}
   </if>
  </sql>
  
  <sql>
   <if>
    and baoan_privilege.privilege_type = #{vo.privilegeType}
   </if>
   <if>
    and baoan_privilege.pid = #{vo.pid}
   </if>
  </sql>
  
  <select>
 SELECT
  <include></include>
 FROM baoan_privilege
 WHERE pid = #{id}
 </select>
 
 <select>
    select
  <include></include>
    FROM baoan_privilege
    WHERE 1 = 1 
    <include></include>
  </select>
  <select>
    select
  <include></include>
    FROM baoan_privilege
    WHERE 1 = 1 
    <include></include>
  </select>
</mapper>

Step 3: Permission table Service definition

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> parameter);
 
 IPage<baoanprivilegevo> selectPage(Page<baoanprivilegevo> page, Map<string> parameter);
}</string></baoanprivilegevo></baoanprivilegevo></string></baoanprivilegevo></baoanprivilege>
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> implements BaoanPrivilegeService {
 @Autowired
 private BaoanPrivilegeMapper mapper;
 
 @Override
 public List<baoanprivilegevo> selectList(Map<string> parameter) {
  // TODO Auto-generated method stub
  return mapper.selectList(parameter);
 }
 
 @Override
 public IPage<baoanprivilegevo> selectPage(Page<baoanprivilegevo> page, Map<string> parameter) {
  // TODO Auto-generated method stub
  return mapper.selectPage(page, parameter);
 }
 
}</string></baoanprivilegevo></baoanprivilegevo></string></baoanprivilegevo></baoanprivilegemapper>

Step 4:The controller layer interface provides external services

 // 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> 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);
 }</baoanprivilegevo></baoanprivilegevo></baoanprivilegevo></baoanprivilegevo></baoanprivilegevo></string>

Front-end effect display:

How to use SpringBoot+MyBatisPlus+MySQL8 to implement tree structure query

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