sequelize example

api.js

@@ -2,13 +2,25 @@ const express = require('express');
 const studentsrouter = require('./students/students.router');
 const programRouter = require('./progams/program.router')
 const userRouter = require('./users/users.router')
+const sequelize = require('./config/sequelize');
+const User = require('./models/user')
 
 const port = 3002;
 
 const app = express()
 
 app.use(express.json()) // body parser
 
+app.get('/', async (req, res) => {
+
+    // select * from users
+    const users = await User.findAll()
+
+    return res.json({
+        users
+    })
+})
+
 // GET http://localhost/students
 // GET http://localhost/students/134/department
 // GET http://localhost/students/134/program
@@ -34,5 +46,11 @@ app.get('*', (req, res) => {
     })
 })
 
+sequelize.authenticate().then(() => {
+    console.log('Connected to the db successfully!')
+}).catch((err) => {
+    console.log('Error connecting to db', err)
+})
+
 
 app.listen(port, () => console.log(`listening on port: ${port}`))

config/config.js

@@ -0,0 +1,25 @@
+require('dotenv').config()
+
+module.exports = {
+  "development": {
+    "username": process.env.DB_USERNAME,
+    "password": process.env.DB_PASSWORD,
+    "database": process.env.DB_DATABASE,
+    "host": "127.0.0.1",
+    "dialect": "mysql"
+  },
+  "test": {
+    "username": "root",
+    "password": null,
+    "database": "database_test",
+    "host": "127.0.0.1",
+    "dialect": "mysql"
+  },
+  "production": {
+    "username": "root",
+    "password": null,
+    "database": "database_production",
+    "host": "127.0.0.1",
+    "dialect": "mysql"
+  }
+}

config/sequelize.js

@@ -0,0 +1,8 @@
+const { Sequelize } = require('sequelize');
+const config = require('./config');
+
+require('dotenv').config()
+
+const sequelize = new Sequelize(config.development);
+
+module.exports = sequelize;

migrations/20230906175232-create-user.js

@@ -0,0 +1,47 @@
+'use strict';
+/** @type {import('sequelize-cli').Migration} */
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.createTable('users', {
+      id: {
+        allowNull: false,
+        primaryKey: true,
+        type: Sequelize.UUID
+      },
+      name: {
+        type: Sequelize.STRING,
+      },
+      email: {
+        type: Sequelize.STRING,
+        unique: true,
+      },
+      gender: {
+        type: Sequelize.ENUM,
+        values: ['male', 'female'],
+        defaultValue: 'male'
+      },
+      password: {
+        type: Sequelize.STRING
+      },
+      phone_number: {
+        type: Sequelize.STRING
+      },
+      contact: {
+        type: Sequelize.STRING
+      },
+      created_at: {
+        allowNull: false,
+        type: Sequelize.DATE,
+        defaultValue: Sequelize.NOW
+      },
+      updated_at: {
+        allowNull: false,
+        type: Sequelize.DATE,
+        defaultValue: Sequelize.NOW
+      }
+    });
+  },
+  async down(queryInterface, Sequelize) {
+    await queryInterface.dropTable('Users');
+  }
+};

migrations/20230907153311-users.js

@@ -0,0 +1,27 @@
+'use strict';
+
+/** @type {import('sequelize-cli').Migration} */
+module.exports = {
+  async up (queryInterface, Sequelize) {
+    /**
+     * Add altering commands here.
+     *
+     * Example:
+     * await queryInterface.createTable('users', { id: Sequelize.INTEGER });
+     */
+    await queryInterface.addColumn('users', 'country_code', {
+        type: Sequelize.STRING,
+        defaultValue: '+234'
+    })
+  },
+
+  async down (queryInterface, Sequelize) {
+    /**
+     * Add reverting commands here.
+     *
+     * Example:
+     * await queryInterface.dropTable('users');
+     */
+    await queryInterface.removeColumn('users', 'country_code')
+  }
+};

models/index.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const Sequelize = require('sequelize');
+const process = require('process');
+const basename = path.basename(__filename);
+const env = process.env.NODE_ENV || 'development';
+const config = require(__dirname + '/../config/config.js')[env];
+const db = {};
+
+let sequelize;
+if (config.use_env_variable) {
+  sequelize = new Sequelize(process.env[config.use_env_variable], config);
+} else {
+  sequelize = new Sequelize(config.database, config.username, config.password, config);
+}
+
+fs
+  .readdirSync(__dirname)
+  .filter(file => {
+    return (
+      file.indexOf('.') !== 0 &&
+      file !== basename &&
+      file.slice(-3) === '.js' &&
+      file.indexOf('.test.js') === -1
+    );
+  })
+  .forEach(file => {
+    const model = require(path.join(__dirname, file))(sequelize, Sequelize.DataTypes);
+    db[model.name] = model;
+  });
+
+Object.keys(db).forEach(modelName => {
+  if (db[modelName].associate) {
+    db[modelName].associate(db);
+  }
+});
+
+db.sequelize = sequelize;
+db.Sequelize = Sequelize;
+
+module.exports = db;

models/user.js

@@ -0,0 +1,38 @@
+const sequelize = require('../config/sequelize');
+const { Sequelize, DataTypes } = require('sequelize')
+
+
+const User = sequelize.define('users', {
+    id: {
+        type: DataTypes.UUID,
+        primaryKey: true
+    },
+    email: {
+        type: DataTypes.STRING,
+        allowNull: false,
+    },
+    password: {
+        type: DataTypes.STRING,
+        allowNull: false,
+    },
+    phone_number: {
+        type: DataTypes.STRING,
+        allowNull: false,
+    },
+    gender: {
+        type: DataTypes.ENUM,
+        values: ['male', 'female'],
+    },
+    created_at: {
+        type: DataTypes.DATE,
+    },
+    contact: {
+        type: Sequelize.STRING
+    },
+}, {
+    timestamps: true,
+    updatedAt: false,
+    createdAt: 'created_at',
+})
+
+module.exports = User