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add model-sequelize project
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‎samples/node/web/db/model-sequelize/.vscode/launch.json

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{
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"version": "0.2.0",
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"configurations": [
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{
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"name": "Start",
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"type": "node",
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"request": "launch",
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"program": "${workspaceRoot}/start.js",
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"stopOnEntry": false,
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"args": [],
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"cwd": "${workspaceRoot}",
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"preLaunchTask": null,
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"runtimeExecutable": null,
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"runtimeArgs": [
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"--nolazy"
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],
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"env": {
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"NODE_ENV": "development"
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},
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"externalConsole": false,
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"sourceMaps": false,
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"outDir": null
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}
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]
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}

‎samples/node/web/db/model-sequelize/app.js

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const model = require('./model');
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let
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Pet = model.Pet,
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User = model.User;
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(async () => {
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var user = await User.create({
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name: 'John',
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gender: false,
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email: 'john-' + Date.now() + '@garfield.pet',
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passwd: 'hahaha'
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});
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console.log('created: ' + JSON.stringify(user));
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var cat = await Pet.create({
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ownerId: user.id,
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name: 'Garfield',
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gender: false,
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birth: '2007-07-07',
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});
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console.log('created: ' + JSON.stringify(cat));
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var dog = await Pet.create({
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ownerId: user.id,
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name: 'Odie',
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gender: false,
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birth: '2008-08-08',
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});
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console.log('created: ' + JSON.stringify(dog));
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})();

‎samples/node/web/db/model-sequelize/config-default.js

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var config = {
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dialect: 'mysql',
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database: 'nodejs',
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username: 'www',
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password: 'www',
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host: 'localhost',
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port: 3306
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};
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module.exports = config;

‎samples/node/web/db/model-sequelize/config-test.js

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var config = {
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dialect: 'mysql',
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database: 'test',
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username: 'www',
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password: 'www',
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host: 'localhost',
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port: 3306
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};
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module.exports = config;

‎samples/node/web/db/model-sequelize/config.js

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// config files:
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const defaultConfig = './config-default.js';
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const overrideConfig = './config-override.js';
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const testConfig = './config-test.js';
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const fs = require('fs');
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var config = null;
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if (process.env.NODE_ENV === 'test') {
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console.log(`Load ${testConfig}...`);
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config = require(testConfig);
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} else {
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console.log(`Load ${defaultConfig}...`);
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config = require(defaultConfig);
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try {
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if (fs.statSync(overrideConfig).isFile()) {
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console.log(`Load ${overrideConfig}...`);
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config = Object.assign(config, require(overrideConfig));
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}
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} catch (err) {
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console.log(`Cannot load ${overrideConfig}.`);
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}
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}
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module.exports = config;

‎samples/node/web/db/model-sequelize/db.js

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const Sequelize = require('sequelize');
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const uuid = require('node-uuid');
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const config = require('./config');
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console.log('init sequelize...');
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function generateId() {
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return uuid.v4();
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}
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var sequelize = new Sequelize(config.database, config.username, config.password, {
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host: config.host,
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dialect: config.dialect,
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pool: {
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max: 5,
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min: 0,
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idle: 10000
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}
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});
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const ID_TYPE = Sequelize.STRING(50);
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function defineModel(name, attributes) {
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var attrs = {};
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for (let key in attributes) {
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let value = attributes[key];
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if (typeof value === 'object' && value['type']) {
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value.allowNull = value.allowNull || false;
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attrs[key] = value;
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} else {
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attrs[key] = {
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type: value,
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allowNull: false
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};
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}
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}
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attrs.id = {
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type: ID_TYPE,
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primaryKey: true
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};
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attrs.createdAt = {
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type: Sequelize.BIGINT,
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allowNull: false
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};
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attrs.updatedAt = {
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type: Sequelize.BIGINT,
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allowNull: false
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};
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attrs.version = {
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type: Sequelize.BIGINT,
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allowNull: false
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};
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console.log('model defined for table: ' + name + '\n' + JSON.stringify(attrs, function (k, v) {
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if (k === 'type') {
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for (let key in Sequelize) {
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if (key === 'ABSTRACT' || key === 'NUMBER') {
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continue;
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}
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let dbType = Sequelize[key];
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if (typeof dbType === 'function') {
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if (v instanceof dbType) {
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if (v._length) {
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return `${dbType.key}(${v._length})`;
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}
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return dbType.key;
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}
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if (v === dbType) {
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return dbType.key;
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}
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}
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}
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}
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return v;
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}, ' '));
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return sequelize.define(name, attrs, {
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tableName: name,
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timestamps: false,
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hooks: {
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beforeValidate: function (obj) {
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let now = Date.now();
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if (obj.isNewRecord) {
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console.log('will create entity...' + obj);
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if (!obj.id) {
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obj.id = generateId();
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}
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obj.createdAt = now;
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obj.updatedAt = now;
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obj.version = 0;
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} else {
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console.log('will update entity...');
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obj.updatedAt = Date.now();
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obj.version++;
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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 TYPES = ['STRING', 'INTEGER', 'BIGINT', 'TEXT', 'DOUBLE', 'DATEONLY', 'BOOLEAN'];
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var exp = {
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defineModel: defineModel,
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sync: () => {
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// only allow create ddl in non-production environment:
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if (process.env.NODE_ENV !== 'production') {
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sequelize.sync({ force: true });
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} else {
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throw new Error('Cannot sync() when NODE_ENV is set to \'production\'.');
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}
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}
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};
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for (let type of TYPES) {
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exp[type] = Sequelize[type];
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}
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exp.ID = ID_TYPE;
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exp.generateId = generateId;
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module.exports = exp;

‎samples/node/web/db/model-sequelize/init-db.js

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require('babel-core/register')({
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presets: ['stage-3']
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});
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const model = require('./model.js');
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model.sync();
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console.log('init db ok.');
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process.exit(0);

‎samples/node/web/db/model-sequelize/init.txt

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create database nodejs;
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grant all privileges on nodejs.* to 'www'@'%' identified by 'www';
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grant all privileges on test.* to 'www'@'%' identified by 'www';

‎samples/node/web/db/model-sequelize/model.js

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// scan all models defined in models:
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const fs = require('fs');
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const db = require('./db');
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let files = fs.readdirSync(__dirname + '/models');
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let js_files = files.filter((f)=>{
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return f.endsWith('.js');
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}, files);
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module.exports = {};
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for (let f of js_files) {
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console.log(`import model from file ${f}...`);
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let name = f.substring(0, f.length - 3);
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module.exports[name] = require(__dirname + '/models/' + f);
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}
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module.exports.sync = () => {
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db.sync();
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};

‎samples/node/web/db/model-sequelize/models/Pet.js

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const db = require('../db');
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module.exports = db.defineModel('pets', {
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ownerId: db.ID,
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name: db.STRING(100),
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gender: db.BOOLEAN,
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birth: db.STRING(10),
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});

‎samples/node/web/db/model-sequelize/models/User.js

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const db = require('../db');
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module.exports = db.defineModel('users', {
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email: {
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type: db.STRING(100),
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unique: true
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},
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passwd: db.STRING(100),
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name: db.STRING(100),
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gender: db.BOOLEAN
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});

‎samples/node/web/db/model-sequelize/package.json

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{
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"name": "model-sequelize",
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"version": "1.0.0",
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"description": "Sequelize best practice example with async",
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"main": "start.js",
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"scripts": {
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"start": "node start.js"
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},
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"keywords": [
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"sequelize",
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"async"
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],
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"author": "Michael Liao",
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"license": "Apache-2.0",
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"repository": {
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"type": "git",
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"url": "https://github.com/michaelliao/learn-javascript.git"
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},
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"dependencies": {
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"babel-core": "6.13.2",
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"babel-polyfill": "6.13.0",
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"babel-preset-es2015-node6": "0.3.0",
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"babel-preset-stage-3": "6.5.0",
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"sequelize": "3.24.1",
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"mysql": "2.11.1"
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}
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}

‎samples/node/web/db/model-sequelize/start.js

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require('babel-core/register')({
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presets: ['stage-3']
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});
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require('./app.js');

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