入坑node服務開發---數據查詢接口

接下來準備連接一下數據庫 暫時選擇用mysql和sequelize

項目在一步步完善了 這裏只是記錄自己的開發流程並不是詳細的教程

這次的代碼在這裏  https://github.com/chunsenye/nodeServerHistory/tree/master/v1.0.0/mykoaserver

• 安裝數據庫 my_super_db
• 創建數據庫與用戶表 user 
• 添加數據 

  INSERT INTO `my_super_db`.`user`
  (`userid`,
  `usename`,
  `regitime`,
  `lastlogin`,
  `sex`)
  VALUES
  (1,
  'yeyeye',
  '2020-03-20 15:48:57',
  '2020-03-20 15:48:57',
  '男');
  SELECT * FROM my_super_db.user;

   

• 編寫查詢接口

  // app.js
  const Koa = require('koa')
  const Router = require('koa-router')
  const Sequelize = require('sequelize')
  
  var client = require('./client.js')
  var model = require('./models/user')
  const app = new Koa();
  const router = new Router();
  
  // logger
  
  app.use(async (ctx, next) => {
      await next();
  });
  
  // response
  router.get('/getUser', async (ctx) => {
      // 連接數據庫進行查詢
      let data, data2
      try {
          data = await client.query('select * from user')
          const pool = new model(client, Sequelize);
          data2 = await pool.findAndCountAll({})
      } catch (e) {
          console.log(e);
      }
      ctx.body = {
          data,
          data2
      }
  })
  
  app.use(router.routes());
  
  app.listen(8080, () => {
      console.log(`Server is listening on 8080`);
  });
  

  // client.js
  const Sequelize = require('sequelize')
  const params = {
      host: 'localhost',
      port: 3306,
      dialect: 'mysql',
      dialectOptions: {
          useUTC: false, //for reading from database
          dateStrings: true,
          typeCast: true
      },
      timezone: "+08:00",
      pool: {
          max: 10000, //最大連接數
          min: 0,     //最小連接數
          acquire: 1000000,   //請求超時時間
          idle: 10000 //斷開連接後，連接實例在連接池保持的時間
      },
      define: {
          timestamps: false
      },
  
      operatorsAliases: false
  }
  const client = new Sequelize('my_super_db', 'root', '123456', params);
  
  module.exports = client
  

  /* jshint indent: 1 */
  // user.js
  module.exports = function(sequelize, DataTypes) {
  	return sequelize.define('user', {
  		userid: {
  			type: DataTypes.INTEGER(11),
  			allowNull: false,
  			primaryKey: true,
  			autoIncrement: true
  		},
  		usename: {
  			type: DataTypes.STRING(45),
  			allowNull: false
  		},
  		regitime: {
  			type: DataTypes.DATE,
  			allowNull: true,
  			defaultValue: sequelize.literal('CURRENT_TIMESTAMP')
  		},
  		lastlogin: {
  			type: DataTypes.DATE,
  			allowNull: true,
  			defaultValue: sequelize.literal('CURRENT_TIMESTAMP')
  		},
  		sex: {
  			type: DataTypes.STRING(45),
  			allowNull: true
  		},
  	}, {
  		tableName: 'user'
  	});
  };
  

  {
    "name": "myserver",
    "version": "1.0.0",
    "description": "yeyyeyeeyeeeee",
    "main": "app.js",
    "scripts": {
      "test": "echo \"Error: no test specified\" && exit 1"
    },
    "author": "yeyeye",
    "license": "ISC",
    "dependencies": {
      "koa": "^2.11.0",
      "koa-router": "^8.0.8",
      "mysql": "^2.18.1",
      "mysql2": "^2.1.0",
      "sequelize": "^5.21.5"
    }
  }
  

  文件夾結構

• 上傳代碼
• 運行代碼

這裏是服務端的接口

接下來要在前端項目中調用這個接口