Driver Adapters

Prisma v7 requires driver adapters for all database connections. This replaces the built-in Rust query engine.

Why Driver Adapters?

• No more binary downloads
• Smaller bundle size
• Better serverless/edge compatibility
• Uses native Node.js database drivers
• More control over connection pooling

Available Adapters

Database	Adapter Package	Underlying Driver
PostgreSQL	@prisma/adapter-pg	pg
MySQL / MariaDB	@prisma/adapter-mariadb	mariadb
SQLite	@prisma/adapter-better-sqlite3	better-sqlite3
Prisma Postgres	@prisma/adapter-ppg	@prisma/ppg
SQL Server	@prisma/adapter-mssql	mssql
Neon	@prisma/adapter-neon	@neondatabase/serverless
PlanetScale	@prisma/adapter-planetscale	@planetscale/database
Turso/libSQL	@prisma/adapter-libsql	@libsql/client
D1 (Cloudflare)	@prisma/adapter-d1	Cloudflare D1

Installation

PostgreSQL

npm install @prisma/adapter-pg

MySQL

npm install @prisma/adapter-mariadb mariadb

SQLite

npm install @prisma/adapter-better-sqlite3

Prisma Postgres

npm install @prisma/adapter-ppg @prisma/ppg

SQL Server

npm install @prisma/adapter-mssql mssql

Configuration

PostgreSQL

import { PrismaClient } from '../generated/client'
import { PrismaPg } from '@prisma/adapter-pg'

const adapter = new PrismaPg({
  connectionString: process.env.DATABASE_URL
})

const prisma = new PrismaClient({ adapter })

MySQL

import { PrismaClient } from '../generated/client'
import { PrismaMariaDb } from '@prisma/adapter-mariadb'

const adapter = new PrismaMariaDb({
  host: 'localhost',
  port: 3306,
  connectionLimit: 5,
  user: process.env.MYSQL_USER,
  password: process.env.MYSQL_PASSWORD,
  database: process.env.MYSQL_DATABASE,
})

const prisma = new PrismaClient({ adapter })

SQLite

import { PrismaClient } from '../generated/client'
import { PrismaBetterSqlite3 } from '@prisma/adapter-better-sqlite3'

const adapter = new PrismaBetterSqlite3({
  url: process.env.DATABASE_URL || 'file:./dev.db'
})

const prisma = new PrismaClient({ adapter })

Neon (Serverless PostgreSQL)

import { PrismaClient } from '../generated/client'
import { PrismaNeon } from '@prisma/adapter-neon'

const adapter = new PrismaNeon({
  connectionString: process.env.DATABASE_URL
})

const prisma = new PrismaClient({ adapter })

Prisma Postgres

import { PrismaClient } from '../generated/client'
import { PrismaPostgresAdapter } from '@prisma/adapter-ppg'

const prisma = new PrismaClient({
  adapter: new PrismaPostgresAdapter({
    connectionString: process.env.PRISMA_DIRECT_TCP_URL,
  }),
})

SQL Server

import { PrismaClient } from '../generated/client'
import { PrismaMssql } from '@prisma/adapter-mssql'

const adapter = new PrismaMssql({
  server: 'localhost',
  port: 1433,
  database: 'mydb',
  user: process.env.SQLSERVER_USER,
  password: process.env.SQLSERVER_PASSWORD,
  options: {
    encrypt: true,
    trustServerCertificate: true,
  },
})

const prisma = new PrismaClient({ adapter })

Connection Pool Configuration

Driver adapters use the underlying driver's pool settings, which differ from v6 defaults.

PostgreSQL with custom pool

import { PrismaPg } from '@prisma/adapter-pg'

const adapter = new PrismaPg({
  connectionString: process.env.DATABASE_URL,
  // Pool configuration
  max: 10,                    // Maximum connections
  idleTimeoutMillis: 30000,   // Close idle connections after 30s
  connectionTimeoutMillis: 5000, // Connection timeout (v6 default was 5s)
})

Matching v6 behavior

const adapter = new PrismaPg({
  connectionString: process.env.DATABASE_URL,
  connectionTimeoutMillis: 5000,  // v6 used 5 second timeout
})

SSL Configuration

Accept self-signed certificates

const adapter = new PrismaPg({
  connectionString: process.env.DATABASE_URL,
  ssl: {
    rejectUnauthorized: false  // Accept self-signed certs
  }
})

Proper SSL configuration

const adapter = new PrismaPg({
  connectionString: process.env.DATABASE_URL,
  ssl: {
    ca: fs.readFileSync('/path/to/ca-cert.pem'),
    rejectUnauthorized: true
  }
})

Migration from v6

Before (v6)

import { PrismaClient } from '@prisma/client'

const prisma = new PrismaClient({
  datasources: {
    db: { url: process.env.DATABASE_URL }
  }
})

After (v7)

import { PrismaClient } from '../generated/client'
import { PrismaPg } from '@prisma/adapter-pg'

const adapter = new PrismaPg({
  connectionString: process.env.DATABASE_URL
})

const prisma = new PrismaClient({ adapter })

Singleton Pattern

// lib/prisma.ts
import { PrismaClient } from '../generated/client'
import { PrismaPg } from '@prisma/adapter-pg'

const globalForPrisma = globalThis as unknown as {
  prisma: PrismaClient | undefined
}

const adapter = new PrismaPg({
  connectionString: process.env.DATABASE_URL!
})

export const prisma = globalForPrisma.prisma ?? new PrismaClient({ adapter })

if (process.env.NODE_ENV !== 'production') {
  globalForPrisma.prisma = prisma
}