main create

prisma.service.ts

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+import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
+import { PrismaClient } from '@prisma/client';
+import { PrismaPg } from '@prisma/adapter-pg';
+import { Pool } from 'pg';
+import 'dotenv/config';
+
+@Injectable()
+export class PrismaService extends PrismaClient implements OnModuleInit, OnModuleDestroy {
+  private pool: Pool;
+
+  constructor() {
+    const pool = new Pool({ connectionString: process.env.DATABASE_URL });
+    const adapter = new PrismaPg(pool);
+    super({ adapter });
+    this.pool = pool;
+  }
+
+  async onModuleInit() { await this.$connect(); }
+  async onModuleDestroy() {
+    await this.$disconnect();
+    await this.pool.end();
+  }
+}