Initial commit
This commit is contained in:
Zhongwei Li
189
skills/neon-serverless/templates/http-connection.ts
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189
skills/neon-serverless/templates/http-connection.ts
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/**
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* HTTP Connection Template for Neon Serverless
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*
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* This template demonstrates the HTTP connection pattern,
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* ideal for edge functions and stateless serverless environments.
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*
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* Usage: Best for Vercel Edge Functions, AWS Lambda, Cloudflare Workers, etc.
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*/
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import { neon } from '@neondatabase/serverless';
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// Initialize the HTTP client
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// This should be done once per request or in a module-level scope
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const sql = neon(process.env.DATABASE_URL!);
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/**
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* Example: Query a single row
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*/
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export async function getUserById(userId: string) {
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try {
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const user = await sql`SELECT * FROM users WHERE id = ${userId}`;
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return user[0] || null;
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} catch (error) {
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console.error('Failed to fetch user:', error);
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throw error;
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}
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}
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/**
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* Example: Query multiple rows
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*/
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export async function getAllUsers() {
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try {
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const users = await sql`SELECT * FROM users ORDER BY created_at DESC`;
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return users;
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} catch (error) {
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console.error('Failed to fetch users:', error);
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throw error;
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}
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}
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/**
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* Example: Insert data
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*/
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export async function createUser(email: string, name: string) {
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try {
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const result = await sql`
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INSERT INTO users (email, name, created_at)
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VALUES (${email}, ${name}, NOW())
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RETURNING id, email, name, created_at
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`;
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return result[0];
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} catch (error) {
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console.error('Failed to create user:', error);
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throw error;
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}
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}
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/**
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* Example: Update data
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*/
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export async function updateUser(userId: string, updates: Record<string, any>) {
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try {
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const setClauses = Object.entries(updates)
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.map(([key, value]) => `${key} = ${value}`)
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.join(', ');
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const result = await sql`
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UPDATE users
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SET ${setClauses}, updated_at = NOW()
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WHERE id = ${userId}
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RETURNING *
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`;
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return result[0];
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} catch (error) {
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console.error('Failed to update user:', error);
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throw error;
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}
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}
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/**
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* Example: Delete data
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*/
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export async function deleteUser(userId: string) {
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try {
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const result = await sql`
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DELETE FROM users WHERE id = ${userId}
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RETURNING id
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`;
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return result.length > 0;
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} catch (error) {
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console.error('Failed to delete user:', error);
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throw error;
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}
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}
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/**
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* Example: Transaction-like behavior with multiple queries
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* Note: HTTP doesn't support true transactions, but you can sequence queries
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*/
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export async function createUserWithProfile(
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email: string,
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name: string,
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bio: string
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) {
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try {
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// Step 1: Create user
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const userResult = await sql`
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INSERT INTO users (email, name)
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VALUES (${email}, ${name})
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RETURNING id
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`;
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const userId = userResult[0].id;
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// Step 2: Create profile
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const profileResult = await sql`
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INSERT INTO profiles (user_id, bio)
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VALUES (${userId}, ${bio})
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RETURNING *
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`;
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return { userId, profile: profileResult[0] };
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} catch (error) {
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console.error('Failed to create user with profile:', error);
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throw error;
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}
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}
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/**
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* Example: Query with filtering and pagination
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*/
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export async function searchUsers(
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query: string,
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limit: number = 10,
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offset: number = 0
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) {
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try {
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const results = await sql`
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SELECT * FROM users
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WHERE name ILIKE ${'%' + query + '%'}
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OR email ILIKE ${'%' + query + '%'}
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ORDER BY created_at DESC
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LIMIT ${limit}
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OFFSET ${offset}
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`;
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return results;
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} catch (error) {
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console.error('Failed to search users:', error);
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throw error;
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}
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}
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/**
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* Example: Aggregate query
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*/
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export async function getUserStats() {
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try {
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const stats = await sql`
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SELECT
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COUNT(*) as total_users,
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COUNT(CASE WHEN created_at > NOW() - INTERVAL '30 days' THEN 1 END) as new_users_30d,
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MIN(created_at) as oldest_user,
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MAX(created_at) as newest_user
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FROM users
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`;
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return stats[0];
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} catch (error) {
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console.error('Failed to fetch user stats:', error);
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throw error;
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}
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}
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/**
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* Example: Join query
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*/
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export async function getUserWithProfile(userId: string) {
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try {
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const result = await sql`
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SELECT u.*, p.bio, p.avatar_url
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FROM users u
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LEFT JOIN profiles p ON u.id = p.user_id
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WHERE u.id = ${userId}
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`;
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return result[0] || null;
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} catch (error) {
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console.error('Failed to fetch user with profile:', error);
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throw error;
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}
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}
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245
skills/neon-serverless/templates/websocket-pool.ts
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245
skills/neon-serverless/templates/websocket-pool.ts
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@@ -0,0 +1,245 @@
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/**
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* WebSocket Pool Template for Neon Serverless
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*
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* This template demonstrates the WebSocket connection pattern,
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* ideal for Node.js servers and applications needing persistent connections.
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*
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* Usage: Best for Next.js API routes, Express servers, and long-lived applications
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*/
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import { Pool, PoolClient } from '@neondatabase/serverless';
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// Create a global pool instance (reused across requests)
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const pool = new Pool({
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connectionString: process.env.DATABASE_URL,
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max: 20, // Maximum number of connections in the pool
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idleTimeoutMillis: 30000,
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connectionTimeoutMillis: 2000,
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});
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// Optional: Log pool events
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pool.on('error', (err) => {
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console.error('Unexpected error on idle client', err);
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});
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/**
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* Helper: Get a connection from the pool
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*/
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async function withConnection<T>(
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callback: (client: PoolClient) => Promise<T>
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): Promise<T> {
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const client = await pool.connect();
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try {
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return await callback(client);
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} finally {
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client.release();
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}
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}
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/**
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* Example: Query a single row
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*/
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export async function getUserById(userId: string) {
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return withConnection(async (client) => {
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const result = await client.query('SELECT * FROM users WHERE id = $1', [
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userId,
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]);
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return result.rows[0] || null;
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});
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}
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/**
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* Example: Query multiple rows
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*/
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export async function getAllUsers() {
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return withConnection(async (client) => {
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const result = await client.query('SELECT * FROM users ORDER BY created_at DESC');
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return result.rows;
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});
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}
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/**
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* Example: Insert data
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*/
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export async function createUser(email: string, name: string) {
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return withConnection(async (client) => {
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const result = await client.query(
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`INSERT INTO users (email, name, created_at)
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VALUES ($1, $2, NOW())
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RETURNING id, email, name, created_at`,
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[email, name]
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);
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return result.rows[0];
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});
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}
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/**
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* Example: Update data
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*/
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export async function updateUser(
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userId: string,
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updates: Record<string, any>
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) {
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return withConnection(async (client) => {
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const keys = Object.keys(updates);
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const values = Object.values(updates);
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const setClauses = keys
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.map((key, i) => `${key} = $${i + 1}`)
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.join(', ');
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const result = await client.query(
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`UPDATE users SET ${setClauses}, updated_at = NOW()
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WHERE id = $${keys.length + 1}
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RETURNING *`,
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[...values, userId]
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);
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return result.rows[0];
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});
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}
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/**
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* Example: Delete data
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*/
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export async function deleteUser(userId: string) {
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return withConnection(async (client) => {
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const result = await client.query('DELETE FROM users WHERE id = $1', [
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userId,
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]);
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return result.rowCount > 0;
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});
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}
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/**
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* Example: Transaction support (unique to WebSocket connections)
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* Transactions allow multiple queries to be atomic
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*/
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export async function createUserWithProfileTx(
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email: string,
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name: string,
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bio: string
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) {
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const client = await pool.connect();
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try {
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// Start transaction
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await client.query('BEGIN');
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// Step 1: Create user
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const userResult = await client.query(
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'INSERT INTO users (email, name) VALUES ($1, $2) RETURNING id',
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[email, name]
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);
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const userId = userResult.rows[0].id;
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// Step 2: Create profile
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const profileResult = await client.query(
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'INSERT INTO profiles (user_id, bio) VALUES ($1, $2) RETURNING *',
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[userId, bio]
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);
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// Commit transaction
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await client.query('COMMIT');
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return { userId, profile: profileResult.rows[0] };
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} catch (error) {
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// Rollback on error
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await client.query('ROLLBACK');
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console.error('Transaction failed:', error);
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throw error;
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} finally {
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client.release();
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}
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}
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/**
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* Example: Query with filtering and pagination
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*/
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export async function searchUsers(
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query: string,
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limit: number = 10,
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offset: number = 0
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) {
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return withConnection(async (client) => {
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const result = await client.query(
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`SELECT * FROM users
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WHERE name ILIKE $1 OR email ILIKE $2
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ORDER BY created_at DESC
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LIMIT $3 OFFSET $4`,
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[`%${query}%`, `%${query}%`, limit, offset]
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);
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return result.rows;
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});
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}
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/**
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* Example: Aggregate query
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*/
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export async function getUserStats() {
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return withConnection(async (client) => {
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const result = await client.query(`
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SELECT
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COUNT(*) as total_users,
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COUNT(CASE WHEN created_at > NOW() - INTERVAL '30 days' THEN 1 END) as new_users_30d,
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MIN(created_at) as oldest_user,
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MAX(created_at) as newest_user
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FROM users
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`);
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return result.rows[0];
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});
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}
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/**
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* Example: Join query
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*/
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export async function getUserWithProfile(userId: string) {
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return withConnection(async (client) => {
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const result = await client.query(
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`SELECT u.*, p.bio, p.avatar_url
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FROM users u
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LEFT JOIN profiles p ON u.id = p.user_id
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WHERE u.id = $1`,
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[userId]
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);
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return result.rows[0] || null;
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});
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}
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/**
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* Example: Batch operations
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*/
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export async function createMultipleUsers(
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users: Array<{ email: string; name: string }>
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) {
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const client = await pool.connect();
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try {
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await client.query('BEGIN');
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const results = [];
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for (const user of users) {
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const result = await client.query(
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`INSERT INTO users (email, name, created_at)
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VALUES ($1, $2, NOW())
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RETURNING id, email, name`,
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[user.email, user.name]
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);
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results.push(result.rows[0]);
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}
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await client.query('COMMIT');
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return results;
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} catch (error) {
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await client.query('ROLLBACK');
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throw error;
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} finally {
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client.release();
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}
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}
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/**
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* Cleanup: Drain the pool when shutting down
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*/
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export async function closePool() {
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await pool.end();
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console.log('Connection pool closed');
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}
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