egg实现登录鉴权（五）：mysql表中存储树形结构数据

需求

• 在mysql表上实现树形结构数据的存储
• 实现树形数据的查询，返回json格式的树形数据

实现

• mysql表中存储树形结构通常有四种方法，本文采用第一种即每条记录加表示上级id的pid字段
• 数据库表role结构，用户名：root，密码：123456，数据库：test

• 代码基本上和之前的一样，主要实现一维的对象数组转化为树形数组
• config目录下config.default.js和plugin.js都没变
• app/model/role.js

'use strict';

module.exports = app => {
  const { INTEGER, STRING } = app.Sequelize;
  const Role = app.model.define('role', {
    id: { type: INTEGER, primaryKey: true, autoIncrement: true },
    name: STRING(50),
    pid: INTEGER,
  }, {
    timestamps: false,
  });
  return Role;
};

• app/controller/role.js

'use strict';

const Controller = require('egg').Controller;


class RoleController extends Controller {
  async index() {
    const { ctx } = this;
    const data = await ctx.model.Role.findAll({ raw: true });
    ctx.body = ctx.service.role.buildTree(data);
  }
}
module.exports = RoleController;

• app/service/role.js（重点）

'use strict';
const Service = require('egg').Service;
class RoleService extends Service {
  // 构建树形结构数据
  buildTree(data) {
    const res = [];
    // 找出所有根结点
    for (const item of data) {
      if (!item.pid) {
        item.children = getNode(item.id);
        res.push(item);
      }
    }
    // 传入根结点id 递归查找所有子节点
    function getNode(id) {
      const node = [];
      for (const item of data) {
        if (item.pid === id) {
          item.children = getNode(item.id);
          node.push(item);
        }
      }
      if (node.length === 0) return;
      return node;
    }
    return res;
  }
}
module.exports = RoleService;

• app/router.js

'use strict';

/**
 * @param {Egg.Application} app - egg application
 */
module.exports = app => {
  const { router, controller, jwt } = app;
  router.get('/', controller.home.index);

  router.post('/user/login', controller.user.login);
  // 查询用户
  router.get('/user', controller.user.index);
  router.get('/user/:id', jwt, controller.user.show);
  // 新增
  router.put('/user', jwt, controller.user.create);
  // 修改密码
  router.post('/user/:id', jwt, controller.user.updatePwd);
  // 获取角色树
  router.get('/role', controller.role.index);
};

• package.json

{
  "name": "jwt",
  "version": "1.0.0",
  "description": "",
  "private": true,
  "egg": {
    "declarations": true
  },
  "dependencies": {
    "egg": "^2.15.1",
    "egg-cors": "^2.2.3",
    "egg-jwt": "^3.1.7",
    "egg-scripts": "^2.11.0",
    "egg-sequelize": "^5.2.0",
    "mysql2": "^2.0.2"
  },
  "devDependencies": {
    "autod": "^3.0.1",
    "autod-egg": "^1.1.0",
    "egg-bin": "^4.11.0",
    "egg-ci": "^1.11.0",
    "egg-mock": "^3.21.0",
    "eslint": "^5.13.0",
    "eslint-config-egg": "^7.1.0"
  },
  "engines": {
    "node": ">=10.0.0"
  },
  "scripts": {
    "start": "egg-scripts start --daemon --title=egg-server-jwt",
    "stop": "egg-scripts stop --title=egg-server-jwt",
    "dev": "egg-bin dev",
    "debug": "egg-bin debug",
    "test": "npm run lint -- --fix && npm run test-local",
    "test-local": "egg-bin test",
    "cov": "egg-bin cov",
    "lint": "eslint .",
    "ci": "npm run lint && npm run cov",
    "autod": "autod"
  },
  "ci": {
    "version": "10"
  },
  "repository": {
    "type": "git",
    "url": ""
  },
  "author": "",
  "license": "MIT"
}

测试

• 获取角色树

参考

• https://www.zhihu.com/question/20417447
• https://www.jianshu.com/p/bdaffff30b31