SQL Server Setup

Configure Prisma with Microsoft SQL Server.

Prerequisites

• SQL Server 2017, 2019, 2022, or Azure SQL
• TCP/IP enabled

1. Schema Configuration

In prisma/schema.prisma:

datasource db {
  provider = "sqlserver"
}

generator client {
  provider = "prisma-client"
  output   = "../generated"
}

2. Config Configuration (v7)

In prisma.config.ts:

import { defineConfig, env } from 'prisma/config'

export default defineConfig({
  schema: 'prisma/schema.prisma',
  datasource: {
    url: env('DATABASE_URL'),
  },
})

3. Environment Variable

In .env:

DATABASE_URL="sqlserver://localhost:1433;database=mydb;user=sa;password=Password123;encrypt=true;trustServerCertificate=true"

Connection String Format

sqlserver://HOST:PORT;database=DB;user=USER;password=PASS;encrypt=true;trustServerCertificate=true

• encrypt: Required for Azure (true).
• trustServerCertificate: True for self-signed certs (local dev).

Driver Adapter (Prisma ORM 7 required)

Prisma ORM 7 uses the query compiler by default, so you must use a driver adapter.

1. Install adapter and driver:

   npm install @prisma/adapter-mssql mssql
   

2. Instantiate Prisma Client with the adapter:

   import 'dotenv/config'
   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 })
   

Common Issues

"Login failed for user"

• SQL Server auth vs Windows auth. Prisma typically uses SQL Server authentication (username/password).
• Ensure TCP/IP is enabled in SQL Server Configuration Manager.

"Table not found" (dbo schema)

Prisma assumes dbo schema by default. If using another schema, update the model or connection string? SQL Server provider mostly sticks to default schema.