[js][data_repository][06_db_connection_class] Add base

Author: rgomezcasas

examples/js/js-data_repository-06_db_connection_class/.gitignore

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+node_modules/
+.tmp/

examples/js/js-data_repository-06_db_connection_class/babel.config.json

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+{
+    "presets": ["@babel/preset-env"],
+    "plugins": ["@babel/plugin-proposal-class-properties"]
+}

examples/js/js-data_repository-06_db_connection_class/jest.config.js

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+module.exports = {
+    testEnvironment: 'node',
+    verbose: true,
+    cacheDirectory: './.tmp/jestCache',
+    transform: {'^.+\\.js$': 'babel-jest'},
+    testMatch:[ "**/tests/**/*.[jt]s?(x)", "**/?(*.)+(spec|test).[jt]s?(x)" ],
+    moduleFileExtensions: ['js']
+};

examples/js/js-data_repository-06_db_connection_class/package-lock.json

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+{
+  "name": "student_grades",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest"
+  },
+  "author": "",
+  "license": "ISC",
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "jsx"
+    ],
+    "moduleDirectories": [
+      "node_modules",
+      "src"
+    ]
+  },
+  "devDependencies": {
+    "@babel/core": "^7.11.6",
+    "@babel/plugin-proposal-class-properties": "^7.10.4",
+    "@babel/preset-env": "^7.11.5",
+    "@jest/globals": "^26.4.2",
+    "jest": "^26.4.2"
+  },
+  "dependencies": {
+    "sync-mysql": "^3.0.1",
+    "sync-sql": "^1.0.2"
+  }
+}

examples/js/js-data_repository-06_db_connection_class/package.json

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+import {MySqlUserRepository} from "./MySqlUserRepository";
+import {UsersSearcher}       from "./UsersSearcher";
+import {MySqlConfig}         from "./MySqlConfig";
+
+export class Container {
+    mysqlConfig         = new MySqlConfig();
+    mysqlUserRepository = new MySqlUserRepository(this.mysqlConfig);
+    usersSearcher       = new UsersSearcher(this.mysqlUserRepository);
+}

examples/js/js-data_repository-06_db_connection_class/src/Container.js

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+export class MySqlConfig {
+    host     = "localhost";
+    user     = "root";
+    password = "";
+    database = "super_project";
+    port     = 3306;
+}

examples/js/js-data_repository-06_db_connection_class/src/MySqlConfig.js

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+export class MySqlUserRepository {
+    constructor(config) {
+        const Mysql     = require('sync-mysql');
+        this.connection = new Mysql({
+            host: config.host,
+            user: config.user,
+            password: config.password,
+            database: config.database,
+            port: config.port
+        });
+    }
+
+    searchAll() {
+        return this.connection.query('SELECT * FROM users');
+    }
+}

examples/js/js-data_repository-06_db_connection_class/src/MySqlUserRepository.js

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+export class UsersSearcher {
+    constructor(repository) {
+        this.repository = repository;
+    }
+
+    searchAll() {
+        return this.repository.searchAll();
+    }
+}

examples/js/js-data_repository-06_db_connection_class/src/UsersSearcher.js

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+export class FakeUserRepository {
+    constructor(users) {
+        this.users = users;
+    }
+
+    searchAll() {
+        return this.users;
+    }
+}