feat: pg引入

src/service/pg.ts

@@ -0,0 +1,34 @@
+import { Pool } from 'pg';
+
+export const connectPg = async () => {
+  if (global.pgClient) {
+    return global.pgClient;
+  }
+
+  global.pgClient = new Pool({
+    host: process.env.PG_HOST,
+    port: process.env.PG_PORT ? +process.env.PG_PORT : 5432,
+    user: process.env.PG_USER,
+    password: process.env.PG_PASSWORD,
+    database: process.env.PG_DB_NAME,
+    max: 20,
+    idleTimeoutMillis: 30000,
+    connectionTimeoutMillis: 2000
+  });
+
+  global.pgClient.on('connect', () => {
+    console.log('pg connected');
+  });
+  global.pgClient.on('error', (err) => {
+    console.log(err);
+    global.pgClient = null;
+  });
+
+  try {
+    await global.pgClient.connect();
+    return global.pgClient;
+  } catch (error) {
+    global.pgClient = null;
+    return Promise.reject(error);
+  }
+};