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1. ãªããžããªã€ã³ã¿ãŒãã§ãŒã¹ã®å®çŸ©
ãªããžããªãå®è£ ããã¡ãœãããæå®ããã€ã³ã¿ãŒãã§ãŒã¹ïŒãŸãã¯TypeScriptã®æœè±¡ã¯ã©ã¹ïŒãå®çŸ©ããããšããå§ããŸãããã®ã€ã³ã¿ãŒãã§ãŒã¹ã¯ãããžãã¹ããžãã¯ãšããŒã¿ã¢ã¯ã»ã¹å±€ã®éã®å¥çŽãå®çŸ©ããŸãã
äŸïŒJavaScriptïŒïŒ
// user_repository_interface.js
export class IUserRepository {
async getUserById(id) {
throw new Error("Method 'getUserById()' must be implemented.");
}
async getAllUsers() {
throw new Error("Method 'getAllUsers()' must be implemented.");
}
async createUser(user) {
throw new Error("Method 'createUser()' must be implemented.");
}
async updateUser(id, user) {
throw new Error("Method 'updateUser()' must be implemented.");
}
async deleteUser(id) {
throw new Error("Method 'deleteUser()' must be implemented.");
}
}
äŸïŒTypeScriptïŒïŒ
// user_repository_interface.ts
export interface IUserRepository {
getUserById(id: string): Promise;
getAllUsers(): Promise;
createUser(user: User): Promise;
updateUser(id: string, user: User): Promise;
deleteUser(id: string): Promise;
}
2. ãªããžããªã¯ã©ã¹ã®å®è£
å®çŸ©ãããã€ã³ã¿ãŒãã§ãŒã¹ãå®è£ ããå ·äœçãªãªããžããªã¯ã©ã¹ãäœæããŸãããã®ã¯ã©ã¹ã«ã¯ãå®éã®ããŒã¿ã¢ã¯ã»ã¹ããžãã¯ãå«ãŸããéžæããããŒã¿ãœãŒã¹ãšå¯Ÿè©±ããŸãã
äŸïŒJavaScript - Mongooseã䜿çšããMongoDBïŒïŒ
// user_repository.js
import mongoose from 'mongoose';
import { IUserRepository } from './user_repository_interface.js';
const UserSchema = new mongoose.Schema({
name: String,
email: String,
});
const UserModel = mongoose.model('User', UserSchema);
export class UserRepository extends IUserRepository {
constructor(dbUrl) {
super();
mongoose.connect(dbUrl).catch(err => console.log(err));
}
async getUserById(id) {
try {
return await UserModel.findById(id).exec();
} catch (error) {
console.error("Error getting user by ID:", error);
return null; // Or throw the error, depending on your error handling strategy
}
}
async getAllUsers() {
try {
return await UserModel.find().exec();
} catch (error) {
console.error("Error getting all users:", error);
return []; // Or throw the error
}
}
async createUser(user) {
try {
const newUser = new UserModel(user);
return await newUser.save();
} catch (error) {
console.error("Error creating user:", error);
throw error; // Rethrow the error to be handled upstream
}
}
async updateUser(id, user) {
try {
return await UserModel.findByIdAndUpdate(id, user, { new: true }).exec();
} catch (error) {
console.error("Error updating user:", error);
return null; // Or throw the error
}
}
async deleteUser(id) {
try {
const result = await UserModel.findByIdAndDelete(id).exec();
return !!result; // Return true if the user was deleted, false otherwise
} catch (error) {
console.error("Error deleting user:", error);
return false; // Or throw the error
}
}
}
äŸïŒTypeScript - Sequelizeã䜿çšããPostgreSQLïŒïŒ
// user_repository.ts
import { Sequelize, DataTypes, Model } from 'sequelize';
import { IUserRepository } from './user_repository_interface.ts';
interface UserAttributes {
id: string;
name: string;
email: string;
}
interface UserCreationAttributes extends Omit {}
class User extends Model implements UserAttributes {
public id!: string;
public name!: string;
public email!: string;
public readonly createdAt!: Date;
public readonly updatedAt!: Date;
}
export class UserRepository implements IUserRepository {
private sequelize: Sequelize;
private UserModel: typeof User; // Store the Sequelize Model
constructor(sequelize: Sequelize) {
this.sequelize = sequelize;
this.UserModel = User.init(
{
id: {
type: DataTypes.UUID,
defaultValue: DataTypes.UUIDV4,
primaryKey: true,
},
name: {
type: DataTypes.STRING,
allowNull: false,
},
email: {
type: DataTypes.STRING,
allowNull: false,
unique: true,
},
},
{
tableName: 'users',
sequelize: sequelize, // Pass the Sequelize instance
}
);
}
async getUserById(id: string): Promise {
try {
return await this.UserModel.findByPk(id);
} catch (error) {
console.error("Error getting user by ID:", error);
return null;
}
}
async getAllUsers(): Promise {
try {
return await this.UserModel.findAll();
} catch (error) {
console.error("Error getting all users:", error);
return [];
}
}
async createUser(user: UserCreationAttributes): Promise {
try {
return await this.UserModel.create(user);
} catch (error) {
console.error("Error creating user:", error);
throw error;
}
}
async updateUser(id: string, user: UserCreationAttributes): Promise {
try {
const [affectedCount] = await this.UserModel.update(user, { where: { id } });
if (affectedCount === 0) {
return null; // No user found with that ID
}
return await this.UserModel.findByPk(id);
} catch (error) {
console.error("Error updating user:", error);
return null;
}
}
async deleteUser(id: string): Promise {
try {
const deletedCount = await this.UserModel.destroy({ where: { id } });
return deletedCount > 0; // Returns true if a user was deleted
} catch (error) {
console.error("Error deleting user:", error);
return false;
}
}
}
3. ãªããžããªããµãŒãã¹ã«æ³šå ¥ãã
ã¢ããªã±ãŒã·ã§ã³ãµãŒãã¹ãŸãã¯ããžãã¹ããžãã¯ã³ã³ããŒãã³ãã§ããªããžããªã€ã³ã¹ã¿ã³ã¹ãæ³šå ¥ããŸããããã«ãããããŒã¿ã¢ã¯ã»ã¹å±€ãšçŽæ¥å¯Ÿè©±ããããšãªãããªããžããªã€ã³ã¿ãŒãã§ãŒã¹ãä»ããŠããŒã¿ã«ã¢ã¯ã»ã¹ã§ããŸãã
äŸïŒJavaScriptïŒïŒ
// user_service.js
export class UserService {
constructor(userRepository) {
this.userRepository = userRepository;
}
async getUserProfile(userId) {
const user = await this.userRepository.getUserById(userId);
if (!user) {
throw new Error("User not found");
}
return {
id: user._id,
name: user.name,
email: user.email,
};
}
async createUser(userData) {
// Validate user data before creating
if (!userData.name || !userData.email) {
throw new Error("Name and email are required");
}
return this.userRepository.createUser(userData);
}
// Other service methods...
}
äŸïŒTypeScriptïŒïŒ
// user_service.ts
import { IUserRepository } from './user_repository_interface.ts';
import { User } from './models/user.ts';
export class UserService {
private userRepository: IUserRepository;
constructor(userRepository: IUserRepository) {
this.userRepository = userRepository;
}
async getUserProfile(userId: string): Promise {
const user = await this.userRepository.getUserById(userId);
if (!user) {
throw new Error("User not found");
}
return user;
}
async createUser(userData: Omit): Promise {
// Validate user data before creating
if (!userData.name || !userData.email) {
throw new Error("Name and email are required");
}
return this.userRepository.createUser(userData);
}
// Other service methods...
}
4. ã¢ãžã¥ãŒã«ã®ãã³ãã«ãšäœ¿ç𿹿³
ã¢ãžã¥ãŒã«ãã³ãã©ãŒïŒWebpackãParcelãRollupãªã©ïŒã䜿çšããŠããã©ãŠã¶ãŸãã¯Node.jsç°å¢ã«ãããã€ããããã®ã¢ãžã¥ãŒã«ããã³ãã«ããŸãã
äŸïŒNode.jsã®ESMïŒïŒ
// app.js
import { UserService } from './user_service.js';
import { UserRepository } from './user_repository.js';
// Replace with your MongoDB connection string
const dbUrl = 'mongodb://localhost:27017/mydatabase';
const userRepository = new UserRepository(dbUrl);
const userService = new UserService(userRepository);
async function main() {
try {
const newUser = await userService.createUser({ name: 'John Doe', email: 'john.doe@example.com' });
console.log('Created user:', newUser);
const userProfile = await userService.getUserProfile(newUser._id);
console.log('User profile:', userProfile);
} catch (error) {
console.error('Error:', error);
}
}
main();
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`IProductRepository`ïŒTypeScriptïŒïŒ
// product_repository_interface.ts
export interface IProductRepository {
getProductById(id: string): Promise;
getAllProducts(): Promise;
getProductsByCategory(category: string): Promise;
createProduct(product: Product): Promise;
updateProduct(id: string, product: Product): Promise;
deleteProduct(id: string): Promise;
}
`ProductRepository`ïŒTypeScript - ä»®ã®ããŒã¿ããŒã¹ã䜿çšïŒïŒ
// product_repository.ts
import { IProductRepository } from './product_repository_interface.ts';
import { Product } from './models/product.ts'; // Assuming you have a Product model
export class ProductRepository implements IProductRepository {
// Assume a database connection or ORM is initialized elsewhere
private db: any; // Replace 'any' with your actual database type or ORM instance
constructor(db: any) {
this.db = db;
}
async getProductById(id: string): Promise {
try {
// Assuming 'products' table and appropriate query method
const product = await this.db.products.findOne({ where: { id } });
return product;
} catch (error) {
console.error("Error getting product by ID:", error);
return null;
}
}
async getAllProducts(): Promise {
try {
const products = await this.db.products.findAll();
return products;
} catch (error) {
console.error("Error getting all products:", error);
return [];
}
}
async getProductsByCategory(category: string): Promise {
try {
const products = await this.db.products.findAll({ where: { category } });
return products;
} catch (error) {
console.error("Error getting products by category:", error);
return [];
}
}
async createProduct(product: Product): Promise {
try {
const newProduct = await this.db.products.create(product);
return newProduct;
} catch (error) {
console.error("Error creating product:", error);
throw error;
}
}
async updateProduct(id: string, product: Product): Promise {
try {
// Update the product, return the updated product or null if not found
const [affectedCount] = await this.db.products.update(product, { where: { id } });
if (affectedCount === 0) {
return null;
}
const updatedProduct = await this.getProductById(id);
return updatedProduct;
} catch (error) {
console.error("Error updating product:", error);
return null;
}
}
async deleteProduct(id: string): Promise {
try {
const deletedCount = await this.db.products.destroy({ where: { id } });
return deletedCount > 0; // True if deleted, false if not found
} catch (error) {
console.error("Error deleting product:", error);
return false;
}
}
}
`ProductService`ïŒTypeScriptïŒïŒ
// product_service.ts
import { IProductRepository } from './product_repository_interface.ts';
import { Product } from './models/product.ts';
export class ProductService {
private productRepository: IProductRepository;
constructor(productRepository: IProductRepository) {
this.productRepository = productRepository;
}
async getProductDetails(productId: string): Promise {
// Add business logic, such as checking product availability
const product = await this.productRepository.getProductById(productId);
if (!product) {
return null; // Or throw an exception
}
return product;
}
async listProductsByCategory(category: string): Promise {
// Add business logic, such as filtering by featured products
return this.productRepository.getProductsByCategory(category);
}
async createNewProduct(productData: Omit): Promise {
// Perform validation, sanitization, etc.
return this.productRepository.createProduct(productData);
}
// Add other service methods for updating, deleting products, etc.
}
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