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

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);登录后复制

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")@Datapublic 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;}登录后复制

拓展对象

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

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 { List selectList(Map parameter); IPage selectPage(Page page, @Param("vo")Map parameter);}登录后复制

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 登录后复制

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);}登录后复制

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; @Servicepublic 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); } }登录后复制

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); }登录后复制

前端效果展示:

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