\u5728\u4f20\u7edf\u7684 CRUD \u67b6\u6784\u4e2d\uff0c\u8bfb\u548c\u5199\u64cd\u4f5c\u5171\u7528\u540c\u4e00\u6570\u636e\u6a21\u578b\uff0c\u5bfc\u81f4\u7cfb\u7edf\u5728\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u6027\u80fd\u74f6\u9888\u660e\u663e\u3002\u4f8b\u5982\uff0c\u7535\u5546\u8ba2\u5355\u7cfb\u7edf\u9700\u8981\u9891\u7e41\u67e5\u8be2\u8ba2\u5355\u72b6\u6001\uff0c\u540c\u65f6\u4e5f\u8981\u5904\u7406\u4e0b\u5355\u3001\u652f\u4ed8\u7b49\u5199\u64cd\u4f5c\u3002\u5982\u679c\u8bfb\u5199\u6df7\u7528\uff0c\u590d\u6742\u7684\u67e5\u8be2\u4f1a\u62d6\u6162\u5199\u64cd\u4f5c\u7684\u54cd\u5e94\u65f6\u95f4\u3002<\/p>\n
CQRS\uff08Command Query Responsibility Segregation\uff09\u6a21\u5f0f\u901a\u8fc7\u5206\u79bb\u547d\u4ee4\uff08\u5199\uff09\u548c\u67e5\u8be2\uff08\u8bfb\uff09\u7684\u804c\u8d23\uff0c\u5141\u8bb8\u5404\u81ea\u72ec\u7acb\u4f18\u5316\u3002\u672c\u6587\u5c06\u4ee5\u4e00\u4e2a\u7b80\u5316\u7248\u7684\u7535\u5546\u8ba2\u5355\u7cfb\u7edf\u4e3a\u4f8b\uff0c\u4ece\u96f6\u5f00\u59cb\u5b9e\u73b0 CQRS\uff0c\u5e76\u7ed3\u5408\u4e8b\u4ef6\u6eaf\u6e90\uff08Event Sourcing\uff09\u6765\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027\u3002<\/p>\n
\u6211\u4eec\u4f7f\u7528 Node.js + TypeScript \u5b9e\u73b0\uff0c\u6570\u636e\u5e93\u9009\u7528 PostgreSQL\uff08\u5199\u5e93\uff09\u548c Redis\uff08\u8bfb\u5e93\u7f13\u5b58\uff09\u3002\u9996\u5148\u521d\u59cb\u5316\u9879\u76ee\uff1a<\/p>\n
\nmkdir cqrs-demo\ncd cqrs-demo\nnpm init -y\nnpm install typescript @types\/node ts-node pg redis uuid\n<\/code><\/pre>\n\u521b\u5efa tsconfig.json<\/code>\uff1a<\/p>\n\n{\n "compilerOptions": {\n "target": "ES2020",\n "module": "commonjs",\n "outDir": ".\/dist",\n "rootDir": ".\/src",\n "strict": true,\n "esModuleInterop": true\n }\n}\n<\/code><\/pre>\n\u6838\u5fc3\u6982\u5ff5\u5b9e\u73b0<\/h2>\n1. \u547d\u4ee4\u4e0e\u547d\u4ee4\u5904\u7406\u5668<\/h3>\n
\u547d\u4ee4\uff08Command\uff09\u4ee3\u8868\u4e00\u4e2a\u5199\u64cd\u4f5c\uff0c\u5982\u521b\u5efa\u8ba2\u5355\u3002\u547d\u4ee4\u5904\u7406\u5668\uff08Command Handler\uff09\u8d1f\u8d23\u6267\u884c\u547d\u4ee4\u5e76\u4ea7\u751f\u4e8b\u4ef6\u3002<\/p>\n
\n\/\/ src\/commands\/CreateOrderCommand.ts\nexport class CreateOrderCommand {\n constructor(\n public readonly orderId: string,\n public readonly userId: string,\n public readonly items: { productId: string; quantity: number }[],\n public readonly totalAmount: number\n ) {}\n}\n<\/code><\/pre>\n\n\/\/ src\/commands\/CreateOrderHandler.ts\nimport { CreateOrderCommand } from '.\/CreateOrderCommand';\nimport { EventStore } from '..\/events\/EventStore';\nimport { OrderCreatedEvent } from '..\/events\/OrderCreatedEvent';\n\nexport class CreateOrderHandler {\n constructor(private eventStore: EventStore) {}\n\n async handle(command: CreateOrderCommand): Promise<void> {\n \/\/ \u4e1a\u52a1\u6821\u9a8c\uff08\u7b80\u5316\uff09\n if (!command.orderId || !command.userId) {\n throw new Error('Invalid command');\n }\n\n \/\/ \u751f\u6210\u4e8b\u4ef6\n const event = new OrderCreatedEvent(\n command.orderId,\n command.userId,\n command.items,\n command.totalAmount,\n new Date()\n );\n\n \/\/ \u4fdd\u5b58\u4e8b\u4ef6\u5230\u4e8b\u4ef6\u5b58\u50a8\n await this.eventStore.save(event);\n }\n}\n<\/code><\/pre>\n2. \u4e8b\u4ef6\u4e0e\u4e8b\u4ef6\u5b58\u50a8<\/h3>\n
\u4e8b\u4ef6\uff08Event\uff09\u8868\u793a\u5df2\u7ecf\u53d1\u751f\u7684\u4e8b\u60c5\uff0c\u662f\u4e0d\u53ef\u53d8\u7684\u3002\u4e8b\u4ef6\u5b58\u50a8\uff08Event Store\uff09\u8d1f\u8d23\u6301\u4e45\u5316\u4e8b\u4ef6\uff0c\u5e76\u652f\u6301\u6309\u805a\u5408ID\u67e5\u8be2\u3002<\/p>\n
\n\/\/ src\/events\/OrderCreatedEvent.ts\nexport class OrderCreatedEvent {\n constructor(\n public readonly orderId: string,\n public readonly userId: string,\n public readonly items: { productId: string; quantity: number }[],\n public readonly totalAmount: number,\n public readonly createdAt: Date\n ) {}\n\n get eventType(): string {\n return 'OrderCreated';\n }\n}\n<\/code><\/pre>\n\n\/\/ src\/events\/EventStore.ts\nimport { Pool } from 'pg';\n\nexport class EventStore {\n constructor(private pool: Pool) {}\n\n async save(event: any): Promise<void> {\n const query = `\n INSERT INTO events (aggregate_id, event_type, event_data, created_at)\n VALUES ($1, $2, $3, $4)\n `;\n const values = [\n event.orderId,\n event.eventType,\n JSON.stringify(event),\n event.createdAt\n ];\n await this.pool.query(query, values);\n }\n\n async getEventsByAggregateId(aggregateId: string): Promise<any[]> {\n const result = await this.pool.query(\n 'SELECT event_data FROM events WHERE aggregate_id = $1 ORDER BY created_at',\n [aggregateId]\n );\n return result.rows.map(row => JSON.parse(row.event_data));\n }\n}\n<\/code><\/pre>\n\u521b\u5efa\u4e8b\u4ef6\u8868\uff1a<\/p>\n
\nCREATE TABLE events (\n id SERIAL PRIMARY KEY,\n aggregate_id VARCHAR(255) NOT NULL,\n event_type VARCHAR(255) NOT NULL,\n event_data JSONB NOT NULL,\n created_at TIMESTAMP NOT NULL\n);\nCREATE INDEX idx_aggregate_id ON events (aggregate_id);\n<\/code><\/pre>\n3. \u8bfb\u6a21\u578b\u4e0e\u6295\u5f71<\/h3>\n
\u8bfb\u6a21\u578b\uff08Read Model\uff09\u662f\u4e13\u4e3a\u67e5\u8be2\u4f18\u5316\u7684\u6570\u636e\u89c6\u56fe\u3002\u6295\u5f71\uff08Projection\uff09\u8d1f\u8d23\u6d88\u8d39\u4e8b\u4ef6\u5e76\u66f4\u65b0\u8bfb\u6a21\u578b\u3002\u6211\u4eec\u4f7f\u7528 Redis \u4f5c\u4e3a\u7f13\u5b58\uff0c\u540c\u65f6\u7ef4\u62a4\u4e00\u4e2a PostgreSQL \u8bfb\u5e93\u8868\u3002<\/p>\n
\n\/\/ src\/readmodels\/OrderReadModel.ts\nexport interface OrderReadModel {\n orderId: string;\n userId: string;\n items: { productId: string; quantity: number }[];\n totalAmount: number;\n status: string;\n createdAt: Date;\n}\n<\/code><\/pre>\n\n\/\/ src\/projections\/OrderProjection.ts\nimport { EventStore } from '..\/events\/EventStore';\nimport { Redis } from 'ioredis';\nimport { Pool } from 'pg';\n\nexport class OrderProjection {\n constructor(\n private eventStore: EventStore,\n private redis: Redis,\n private readDb: Pool\n ) {}\n\n async project(event: any): Promise<void> {\n if (event.eventType === 'OrderCreated') {\n await this.handleOrderCreated(event);\n }\n }\n\n private async handleOrderCreated(event: any): Promise<void> {\n const readModel = {\n orderId: event.orderId,\n userId: event.userId,\n items: event.items,\n totalAmount: event.totalAmount,\n status: 'created',\n createdAt: event.createdAt\n };\n\n \/\/ \u66f4\u65b0 Redis \u7f13\u5b58\n await this.redis.set(\n `order:${event.orderId}`,\n JSON.stringify(readModel),\n 'EX',\n 3600\n );\n\n \/\/ \u66f4\u65b0 PostgreSQL \u8bfb\u5e93\n await this.readDb.query(\n `INSERT INTO order_read (order_id, user_id, items, total_amount, status, created_at)\n VALUES ($1, $2, $3, $4, $5, $6)\n ON CONFLICT (order_id) DO UPDATE SET\n items = EXCLUDED.items,\n total_amount = EXCLUDED.total_amount,\n status = EXCLUDED.status`,\n [\n readModel.orderId,\n readModel.userId,\n JSON.stringify(readModel.items),\n readModel.totalAmount,\n readModel.status,\n readModel.createdAt\n ]\n );\n }\n}\n<\/code><\/pre>\n4. \u67e5\u8be2\u5904\u7406\u5668<\/h3>\n
\u67e5\u8be2\u5904\u7406\u5668\uff08Query Handler\uff09\u8d1f\u8d23\u5904\u7406\u8bfb\u8bf7\u6c42\uff0c\u76f4\u63a5\u4ece\u8bfb\u6a21\u578b\u8fd4\u56de\u6570\u636e\u3002<\/p>\n
\n\/\/ src\/queries\/GetOrderQuery.ts\nexport class GetOrderQuery {\n constructor(public readonly orderId: string) {}\n}\n<\/code><\/pre>\n\n\/\/ src\/queries\/GetOrderHandler.ts\nimport { Redis } from 'ioredis';\nimport { Pool } from 'pg';\nimport { OrderReadModel } from '..\/readmodels\/OrderReadModel';\n\nexport class GetOrderHandler {\n constructor(\n private redis: Redis,\n private readDb: Pool\n ) {}\n\n async handle(query: GetOrderQuery): Promise<OrderReadModel | null> {\n \/\/ \u5148\u4ece\u7f13\u5b58\u8bfb\u53d6\n const cached = await this.redis.get(`order:${query.orderId}`);\n if (cached) {\n return JSON.parse(cached);\n }\n\n \/\/ \u7f13\u5b58\u672a\u547d\u4e2d\uff0c\u4ece\u8bfb\u5e93\u8bfb\u53d6\n const result = await this.readDb.query(\n 'SELECT * FROM order_read WHERE order_id = $1',\n [query.orderId]\n );\n\n if (result.rows.length === 0) {\n return null;\n }\n\n const row = result.rows[0];\n const readModel: OrderReadModel = {\n orderId: row.order_id,\n userId: row.user_id,\n items: JSON.parse(row.items),\n totalAmount: row.total_amount,\n status: row.status,\n createdAt: row.created_at\n };\n\n \/\/ \u5199\u5165\u7f13\u5b58\n await this.redis.set(\n `order:${query.orderId}`,\n JSON.stringify(readModel),\n 'EX',\n 3600\n );\n\n return readModel;\n }\n}\n<\/code><\/pre>\n\u7ec4\u88c5\u4e0e\u8fd0\u884c<\/h2>\n1. \u4f9d\u8d56\u6ce8\u5165\u4e0e\u8def\u7531<\/h3>\n
\u4f7f\u7528\u7b80\u5355\u7684\u5de5\u5382\u6a21\u5f0f\u7ec4\u88c5\u7ec4\u4ef6\uff1a<\/p>\n
\n\/\/ src\/index.ts\nimport { Pool } from 'pg';\nimport Redis from 'ioredis';\nimport { EventStore } from '.\/events\/EventStore';\nimport { CreateOrderHandler } from '.\/commands\/CreateOrderHandler';\nimport { GetOrderHandler } from '.\/queries\/GetOrderHandler';\nimport { OrderProjection } from '.\/projections\/OrderProjection';\n\nasync function main() {\n \/\/ \u521d\u59cb\u5316\u6570\u636e\u5e93\u8fde\u63a5\n const writeDb = new Pool({ connectionString: 'postgres:\/\/user:pass@localhost:5432\/write_db' });\n const readDb = new Pool({ connectionString: 'postgres:\/\/user:pass@localhost:5432\/read_db' });\n const redis = new Redis({ host: 'localhost', port: 6379 });\n\n const eventStore = new EventStore(writeDb);\n const createOrderHandler = new CreateOrderHandler(eventStore);\n const getOrderHandler = new GetOrderHandler(redis, readDb);\n const projection = new OrderProjection(eventStore, redis, readDb);\n\n \/\/ \u6a21\u62df\u4e8b\u4ef6\u5904\u7406\uff08\u751f\u4ea7\u73af\u5883\u5e94\u4f7f\u7528\u6d88\u606f\u961f\u5217\uff09\n \/\/ \u5b9e\u9645\u9879\u76ee\u4e2d\uff0c\u4e8b\u4ef6\u5b58\u50a8\u540e\u5e94\u53d1\u5e03\u5230\u6d88\u606f\u961f\u5217\uff0c\u7531\u6295\u5f71\u6d88\u8d39\n \/\/ \u8fd9\u91cc\u7b80\u5316\uff1a\u5728\u547d\u4ee4\u5904\u7406\u5668\u4e2d\u76f4\u63a5\u8c03\u7528\u6295\u5f71\n \/\/ \u6ce8\u610f\uff1a\u66f4\u597d\u7684\u505a\u6cd5\u662f\u5f02\u6b65\u89e3\u8026\n\n \/\/ \u793a\u4f8b\uff1a\u521b\u5efa\u8ba2\u5355\n const command = new CreateOrderCommand('order-123', 'user-456', [\n { productId: 'prod-1', quantity: 2 }\n ], 99.99);\n await createOrderHandler.handle(command);\n\n \/\/ \u624b\u52a8\u89e6\u53d1\u6295\u5f71\uff08\u5b9e\u9645\u5e94\u5f02\u6b65\uff09\n const events = await eventStore.getEventsByAggregateId('order-123');\n for (const event of events) {\n await projection.project(event);\n }\n\n \/\/ \u67e5\u8be2\u8ba2\u5355\n const query = new GetOrderQuery('order-123');\n const order = await getOrderHandler.handle(query);\n console.log('Order:', order);\n}\n\nmain().catch(console.error);\n<\/code><\/pre>\n> \u6ce8\u610f<\/strong>\uff1a\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6295\u5f71\u662f\u540c\u6b65\u8c03\u7528\u7684\uff0c\u4ec5\u7528\u4e8e\u6f14\u793a\u3002\u751f\u4ea7\u73af\u5883\u4e2d\uff0c\u4e8b\u4ef6\u5b58\u50a8\u540e\u5e94\u901a\u8fc7\u6d88\u606f\u961f\u5217\uff08\u5982 RabbitMQ\u3001Kafka\uff09\u5f02\u6b65\u53d1\u5e03\u4e8b\u4ef6\uff0c\u7531\u72ec\u7acb\u7684\u6295\u5f71\u670d\u52a1\u6d88\u8d39\uff0c\u4ee5\u907f\u514d\u5199\u8def\u5f84\u963b\u585e\u3002<\/p>\n2. \u6570\u636e\u5e93\u521d\u59cb\u5316\u811a\u672c<\/h3>\n
\u521b\u5efa\u8bfb\u5e93\u8868\uff1a<\/p>\n
\nCREATE TABLE order_read (\n order_id VARCHAR(255) PRIMARY KEY,\n user_id VARCHAR(255) NOT NULL,\n items JSONB NOT NULL,\n total_amount DECIMAL(10,2) NOT NULL,\n status VARCHAR(50) NOT NULL DEFAULT 'created',\n created_at TIMESTAMP NOT NULL\n);\n<\/code><\/pre>\n\u8fdb\u9636\u4f18\u5316\uff1a\u4e8b\u4ef6\u6eaf\u6e90\u4e0e\u805a\u5408\u6839<\/h2>\n
\u5728 CQRS \u4e2d\uff0c\u805a\u5408\u6839\uff08Aggregate Root\uff09\u8d1f\u8d23\u4fdd\u8bc1\u4e1a\u52a1\u4e00\u81f4\u6027\u3002\u4e8b\u4ef6\u6eaf\u6e90\uff08Event Sourcing\uff09\u5c06\u805a\u5408\u7684\u72b6\u6001\u5b58\u50a8\u4e3a\u4e00\u7cfb\u5217\u4e8b\u4ef6\uff0c\u91cd\u5efa\u72b6\u6001\u65f6\u56de\u653e\u4e8b\u4ef6\u3002<\/p>\n
\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u8ba2\u5355\u805a\u5408\u6839<\/h3>\n\n\/\/ src\/aggregates\/OrderAggregate.ts\nimport { OrderCreatedEvent } from '..\/events\/OrderCreatedEvent';\n\nexport class OrderAggregate {\n public orderId: string = '';\n public userId: string = '';\n public status: string = '';\n\n \/\/ \u4ece\u4e8b\u4ef6\u91cd\u5efa\u72b6\u6001\n static fromEvents(events: any[]): OrderAggregate {\n const aggregate = new OrderAggregate();\n for (const event of events) {\n aggregate.apply(event);\n }\n return aggregate;\n }\n\n apply(event: any): void {\n if (event.eventType === 'OrderCreated') {\n this.orderId = event.orderId;\n this.userId = event.userId;\n this.status = 'created';\n }\n \/\/ \u5176\u4ed6\u4e8b\u4ef6\u5904\u7406...\n }\n}\n<\/code><\/pre>\n\u8fd9\u6837\uff0c\u547d\u4ee4\u5904\u7406\u5668\u53ef\u4ee5\u4ece\u4e8b\u4ef6\u5b58\u50a8\u4e2d\u83b7\u53d6\u6240\u6709\u4e8b\u4ef6\uff0c\u91cd\u5efa\u805a\u5408\u72b6\u6001\uff0c\u7136\u540e\u6267\u884c\u4e1a\u52a1\u903b\u8f91\u5e76\u4ea7\u751f\u65b0\u4e8b\u4ef6\u3002<\/p>\n
\u5e38\u89c1\u5751\u4e0e\u6700\u4f73\u5b9e\u8df5<\/h2>\n\n- \u6700\u7ec8\u4e00\u81f4\u6027<\/strong>\uff1aCQRS \u8bfb\u6a21\u578b\u662f\u6700\u7ec8\u4e00\u81f4\u7684\uff0c\u4ece\u5199\u547d\u4ee4\u5230\u8bfb\u6a21\u578b\u66f4\u65b0\u5b58\u5728\u5ef6\u8fdf\u3002\u5bf9\u4e8e\u9700\u8981\u5f3a\u4e00\u81f4\u7684\u573a\u666f\uff08\u5982\u652f\u4ed8\uff09\uff0c\u5e94\u76f4\u63a5\u4ece\u5199\u5e93\u8bfb\u53d6\u6216\u4f7f\u7528\u540c\u6b65\u6295\u5f71\u3002<\/li>\n
- \u4e8b\u4ef6\u7248\u672c\u7ba1\u7406<\/strong>\uff1a\u4e8b\u4ef6\u7ed3\u6784\u53ef\u80fd\u53d8\u5316\uff0c\u5efa\u8bae\u4e3a\u4e8b\u4ef6\u6dfb\u52a0\u7248\u672c\u53f7\uff0c\u5e76\u7f16\u5199\u8fc1\u79fb\u811a\u672c\u3002<\/li>\n
- \u907f\u514d\u8fc7\u5ea6\u8bbe\u8ba1<\/strong>\uff1a\u5e76\u975e\u6240\u6709\u7cfb\u7edf\u90fd\u9700\u8981 CQRS\u3002\u5f53\u4f60\u7684\u7cfb\u7edf\u8bfb\u5199\u8d1f\u8f7d\u4e0d\u5747\u8861\uff0c\u6216\u67e5\u8be2\u590d\u6742\u5ea6\u8fdc\u8d85\u5199\u5165\u65f6\uff0c\u624d\u8003\u8651\u5f15\u5165\u3002<\/li>\n
- \u6d88\u606f\u961f\u5217\u53ef\u9760\u6027<\/strong>\uff1a\u4e8b\u4ef6\u53d1\u5e03\u5230\u6d88\u606f\u961f\u5217\u65f6\uff0c\u9700\u4fdd\u8bc1\u81f3\u5c11\u4e00\u6b21\u6295\u9012\uff0c\u5e76\u5904\u7406\u91cd\u590d\u4e8b\u4ef6\uff08\u5e42\u7b49\u6027\uff09\u3002<\/li>\n<\/ol>\n
\u603b\u7ed3<\/h2>\n
\u672c\u6587\u901a\u8fc7\u4e00\u4e2a\u7535\u5546\u8ba2\u5355\u7cfb\u7edf\uff0c\u5b8c\u6574\u5b9e\u73b0\u4e86 CQRS \u6a21\u5f0f\uff0c\u5305\u62ec\u547d\u4ee4\u3001\u4e8b\u4ef6\u3001\u6295\u5f71\u548c\u67e5\u8be2\u3002CQRS \u5c06\u8bfb\u5199\u804c\u8d23\u5206\u79bb\uff0c\u4f7f\u7cfb\u7edf\u66f4\u7075\u6d3b\u3001\u53ef\u6269\u5c55\u3002\u7ed3\u5408\u4e8b\u4ef6\u6eaf\u6e90\uff0c\u8fd8\u80fd\u83b7\u5f97\u5b8c\u6574\u7684\u5ba1\u8ba1\u65e5\u5fd7\u3002<\/p>\n
\u4e0b\u4e00\u6b65\uff0c\u4f60\u53ef\u4ee5\u5c1d\u8bd5\uff1a<\/p>\n
\n- \u5f15\u5165\u6d88\u606f\u961f\u5217\uff08\u5982 RabbitMQ\uff09\u5f02\u6b65\u89e3\u8026\u547d\u4ee4\u548c\u6295\u5f71<\/li>\n
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