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Angular 10 Nodejs Pagination RestAPIs + Filtering Sorting Example - Fullstack: Angular + Nodejs RestAPIs+ MySQL Tutorial
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‎Angular-Nodejs-Pagination - Backend Nodejs Development/app/config/db.config.js‎

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const env = require('./env.js');
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const Sequelize = require('sequelize');
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const sequelize = new Sequelize(env.database, env.username, env.password, {
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host: env.host,
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dialect: env.dialect,
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operatorsAliases: false,
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pool: {
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max: env.max,
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min: env.pool.min,
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acquire: env.pool.acquire,
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idle: env.pool.idle
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}
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});
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const db = {};
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db.Sequelize = Sequelize;
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db.sequelize = sequelize;
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db.Customer = require('../models/customer.model.js')(sequelize, Sequelize);
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module.exports = db;

‎Angular-Nodejs-Pagination - Backend Nodejs Development/app/config/env.js‎

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const env = {
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database: 'loizenaidb',
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username: 'root',
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password: '12345',
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host: 'localhost',
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dialect: 'mysql',
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pool: {
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max: 5,
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min: 0,
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acquire: 30000,
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idle: 10000
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}
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};
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module.exports = env;

‎Angular-Nodejs-Pagination - Backend Nodejs Development/app/controllers/controller.js‎

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/**
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* Copyright by https://loizenai.com
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* youtube loizenai
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*/
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const db = require('../config/db.config.js');
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const Customer = db.Customer;
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const Sequelize = db.Sequelize;
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exports.create = (req, res) => {
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let customer = {};
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try{
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// Building Customer object from upoading request's body
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customer.firstname = req.body.firstname;
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customer.lastname = req.body.lastname;
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customer.address = req.body.address;
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customer.age = req.body.age;
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customer.salary = req.body.salary;
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// Save to MySQL database
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Customer.create(customer).then(result => {
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// send uploading message to client
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res.status(200).json({
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message: "Upload Successfully a Customer with id = " + result.id,
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customer: result,
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});
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});
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}catch(error){
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res.status(500).json({
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message: "Fail!",
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error: error.message
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});
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}
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}
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exports.pagingfilteringsorting = async (req, res) => {
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try{
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let page = parseInt(req.query.page);
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let limit = parseInt(req.query.size);
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let agesorting = (req.query.agesorting === 'true');
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let desc = (req.query.desc === 'true');
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let salary = req.query.salary ? parseInt(req.query.salary) : -1;
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const offset = page ? page * limit : 0;
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console.log("offset = " + offset);
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let result = {};
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// NOT Filtering with salary
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if(salary < 0 ){
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// not sorting with age
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if(agesorting == false) {
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result = await Customer.findAndCountAll({
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attributes: ['id', 'firstname', 'lastname', 'age', 'address', 'salary', 'copyrightby'],
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limit: limit,
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offset:offset
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});
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} else {
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if(desc == false) { // sorting with age and ascending
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result = await Customer.findAndCountAll({
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attributes: ['id', 'firstname', 'lastname', 'age', 'address', 'salary', 'copyrightby'],
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limit: limit,
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offset:offset,
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order: [
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['age', 'ASC']
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]
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});
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} else { // sorting with age and descending
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result = await Customer.findAndCountAll({
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attributes: ['id', 'firstname', 'lastname', 'age', 'address', 'salary', 'copyrightby'],
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limit: limit,
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offset:offset,
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order: [
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['age', 'DESC']
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]
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});
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}
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}
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} else { // Filtering with salary
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// not sorting with age
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if(agesorting == false) {
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result = await Customer.findAndCountAll({
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attributes: ['id', 'firstname', 'lastname', 'age', 'address', 'salary', 'copyrightby'],
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where: {salary: salary},
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limit: limit,
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offset:offset
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});
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} else {
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if(desc == false) { // sorting with age and ascending
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result = await Customer.findAndCountAll({
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attributes: ['id', 'firstname', 'lastname', 'age', 'address', 'salary', 'copyrightby'],
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where: {salary: salary},
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limit: limit,
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offset:offset,
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order: [
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['age', 'ASC']
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]
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});
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} else { // sorting with age and descending
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result = await Customer.findAndCountAll({
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attributes: ['id', 'firstname', 'lastname', 'age', 'address', 'salary', 'copyrightby'],
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where: {salary: salary},
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limit: limit,
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offset:offset,
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order: [
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['age', 'DESC']
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]
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});
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}
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}
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}
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const totalPages = Math.ceil(result.count / limit);
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const response = {
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"copyrightby": "https://loizenai.com",
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"totalPages": totalPages,
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"pageNumber": page,
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"pageSize": result.rows.length,
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"customers": result.rows
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};
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res.send(response);
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}catch(error) {
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res.status(500).send({
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message: "Error -> Can NOT complete a paging request!",
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error: error.message,
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});
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}
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}
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exports.getSalaries = (req, res) => {
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Customer.findAll({
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attributes: [
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[Sequelize.fn('DISTINCT', Sequelize.col('salary')), 'salary'],
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],
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order: [
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['salary', 'ASC']
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],
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}).then(result => {
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let salaries = result.map(x => x.salary);
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res.send(salaries);
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}).catch(error => {
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res.status(500).send({
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message: "Error -> Can NOT get all customer's salaries",
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error: error.message
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});
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});
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}

‎Angular-Nodejs-Pagination - Backend Nodejs Development/app/models/customer.model.js‎

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module.exports = (sequelize, Sequelize) => {
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const Customer = sequelize.define('customer', {
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id: {
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type: Sequelize.INTEGER,
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autoIncrement: true,
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primaryKey: true
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},
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firstname: {
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type: Sequelize.STRING
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},
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lastname: {
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type: Sequelize.STRING
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},
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address: {
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type: Sequelize.STRING
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},
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age: {
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type: Sequelize.INTEGER
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},
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salary: {
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type: Sequelize.INTEGER
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},
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copyrightby: {
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type: Sequelize.STRING,
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defaultValue: 'https://loizenai.com'
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}
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});
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return Customer;
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}

‎Angular-Nodejs-Pagination - Backend Nodejs Development/app/routers/router.js‎

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let express = require('express');
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let router = express.Router();
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const customers = require('../controllers/controller.js');
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router.post('/api/customers/create', customers.create);
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router.get('/api/customers/pagefiltersort', customers.pagingfilteringsorting);
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router.get('/api/customers/salaries', customers.getSalaries);
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module.exports = router;

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