initial commit

backend/src/db.ts

@@ -0,0 +1,31 @@
+import { readFile } from 'node:fs/promises';
+import path from 'node:path';
+import pg from 'pg';
+
+const { Pool } = pg;
+type QueryResultRow = pg.QueryResultRow;
+
+const databaseUrl = process.env.DATABASE_URL ?? 'postgres://pokopia:pokopia@localhost:5432/pokopia';
+
+export const pool = new Pool({
+  connectionString: databaseUrl
+});
+
+export async function query<T extends QueryResultRow>(sql: string, params: unknown[] = []): Promise<T[]> {
+  const result = await pool.query<T>(sql, params);
+  return result.rows;
+}
+
+export async function queryOne<T extends QueryResultRow>(sql: string, params: unknown[] = []): Promise<T | null> {
+  const rows = await query<T>(sql, params);
+  return rows[0] ?? null;
+}
+
+export async function initializeDatabase(): Promise<void> {
+  const dbDir = path.join(process.cwd(), 'db');
+  const schema = await readFile(path.join(dbDir, 'schema.sql'), 'utf8');
+  const seed = await readFile(path.join(dbDir, 'seed.sql'), 'utf8');
+
+  await pool.query(schema);
+  await pool.query(seed);
+}