Nodejs-Pagination-Filtering-Sorting RestAPIs

Author: loizenai

Nodejs-Pagination-Filtering-Sorting/app/config/db.config.js

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

Nodejs-Pagination-Filtering-Sorting/app/config/env.js

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

Nodejs-Pagination-Filtering-Sorting/app/controllers/controller.js

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+/**
+ * Copyright by https://loizenai.com
+ * youtube loizenai
+ */
+
+const db = require('../config/db.config.js');
+const Customer = db.Customer;
+
+exports.create = (req, res) => {
+    let customer = {};
+
+    try{
+        // Building Customer object from upoading request's body
+        customer.firstname = req.body.firstname;
+        customer.lastname = req.body.lastname;
+        customer.address = req.body.address;
+        customer.age = req.body.age;
+    
+        // Save to MySQL database
+        Customer.create(customer).then(result => {    
+            // send uploading message to client
+            res.status(200).json({
+                message: "Upload Successfully a Customer with id = " + result.id,
+                customer: result,
+            });
+        });
+    }catch(error){
+        res.status(500).json({
+            message: "Fail!",
+            error: error.message
+        });
+    }
+}
+
+exports.pagination = (req, res) => {
+  try{
+    let page = parseInt(req.query.page);
+    let limit = parseInt(req.query.limit);
+  
+    const offset = page ? page * limit : 0;
+  
+    Customer.findAndCountAll({ limit: limit, offset:offset })
+      .then(data => {
+        const totalPages = Math.ceil(data.count / limit);
+        const response = {
+          message: "Paginating is completed! Query parameters: page = " + page + ", limit = " + limit,
+          data: {
+              "copyrightby": "https://loizenai.com",
+              "totalItems": data.count,
+              "totalPages": totalPages,
+              "limit": limit,
+              "currentPageNumber": page + 1,
+              "currentPageSize": data.rows.length,
+              "customers": data.rows
+          }
+        };
+        res.send(response);
+      });  
+  }catch(error) {
+    res.status(500).send({
+      message: "Error -> Can NOT complete a paging request!",
+      error: error.message,
+    });
+  }    
+}
+
+exports.filteringByAge = (req, res) => {
+  let age = req.query.age;
+
+    Customer.findAll({
+                      attributes: ['id', 'firstname', 'lastname', 'age', 'address', 'copyrightby'],
+                      where: {age: age}
+                    })
+          .then(results => {
+            res.status(200).json({
+                message: "Get all Customers with age = " + age,
+                totalItems: results.length,
+                customers: results,
+            });
+          })
+          . catch(error => {
+              console.log(error);
+              res.status(500).json({
+                message: "Error!",
+                error: error
+              });
+            });
+}
+
+exports.pagingfilteringsorting = (req, res) => {
+  try{
+    let page = parseInt(req.query.page);
+    let limit = parseInt(req.query.limit);
+    let age = parseInt(req.query.age);
+  
+    const offset = page ? page * limit : 0;
+
+    console.log("offset = " + offset);
+  
+    Customer.findAndCountAll({
+                                attributes: ['id', 'firstname', 'lastname', 'age', 'address'],
+                                where: {age: age}, 
+                                order: [
+                                  ['firstname', 'ASC'],
+                                  ['lastname', 'DESC']
+                                ],
+                                limit: limit, 
+                                offset:offset 
+                              })
+      .then(data => {
+        const totalPages = Math.ceil(data.count / limit);
+        const response = {
+          message: "Pagination Filtering Sorting request is completed! Query parameters: page = " + page + ", limit = " + limit + ", age = " + age,
+          data: {
+              "copyrightby": "https://loizenai.com",
+              "totalItems": data.count,
+              "totalPages": totalPages,
+              "limit": limit,
+              "age-filtering": age,
+              "currentPageNumber": page + 1,
+              "currentPageSize": data.rows.length,
+              "customers": data.rows
+          }
+        };
+        res.send(response);
+      });  
+  }catch(error) {
+    res.status(500).send({
+      message: "Error -> Can NOT complete a paging request!",
+      error: error.message,
+    });
+  }      
+}

Nodejs-Pagination-Filtering-Sorting/app/models/customer.model.js

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

Nodejs-Pagination-Filtering-Sorting/app/routers/router.js

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