127 lines
2.6 KiB
Markdown
127 lines
2.6 KiB
Markdown
# MySQL Setup
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Configure Prisma with MySQL (or MariaDB).
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## Prerequisites
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- MySQL or MariaDB database
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- Connection string
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## 1. Schema Configuration
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In `prisma/schema.prisma`:
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```prisma
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datasource db {
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provider = "mysql"
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}
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generator client {
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provider = "prisma-client"
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output = "../generated"
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}
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```
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## 2. Config Configuration
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In `prisma.config.ts`:
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```typescript
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import { defineConfig, env } from 'prisma/config'
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export default defineConfig({
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schema: 'prisma/schema.prisma',
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datasource: {
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url: env('DATABASE_URL'),
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},
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})
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```
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## 3. Environment Variable
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In `.env`:
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```env
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DATABASE_URL="mysql://user:password@localhost:3306/mydb"
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```
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### Connection String Format
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```
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mysql://USER:PASSWORD@HOST:PORT/DATABASE
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```
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- **USER**: Database user
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- **PASSWORD**: Password
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- **HOST**: Hostname
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- **PORT**: Port (default 3306)
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- **DATABASE**: Database name
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## Driver Adapter
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Use a driver adapter for the standard SQL workflow.
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1. Install adapter and driver:
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```bash
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npm install @prisma/adapter-mariadb mariadb
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```
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2. Instantiate Prisma Client with the adapter:
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```typescript
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import 'dotenv/config'
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import { PrismaClient } from '../generated/client'
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import { PrismaMariaDb } from '@prisma/adapter-mariadb'
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const adapter = new PrismaMariaDb({
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host: 'localhost',
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port: 3306,
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connectionLimit: 5,
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user: process.env.MYSQL_USER,
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password: process.env.MYSQL_PASSWORD,
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database: process.env.MYSQL_DATABASE,
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})
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const prisma = new PrismaClient({ adapter })
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```
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### Text protocol option
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If you need the MariaDB driver's text protocol instead of the default binary `execute()` path, enable `useTextProtocol` explicitly:
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```typescript
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import { PrismaClient } from '../generated/client'
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import { PrismaMariaDb } from '@prisma/adapter-mariadb'
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const adapter = new PrismaMariaDb(process.env.DATABASE_URL!, {
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useTextProtocol: true,
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})
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const prisma = new PrismaClient({ adapter })
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```
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Use this only when you specifically need text-protocol compatibility for your MariaDB setup.
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## PlanetScale Setup
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PlanetScale uses MySQL but requires specific settings because it doesn't support foreign key constraints.
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In `prisma/schema.prisma`:
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```prisma
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datasource db {
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provider = "mysql"
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relationMode = "prisma" // Emulate foreign keys in Prisma
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}
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```
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## Common Issues
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### "Too many connections"
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MySQL has a connection limit. Adjust connection pool size in URL:
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```env
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DATABASE_URL="mysql://...?connection_limit=5"
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```
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### JSON Support
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MySQL 5.7+ supports JSON. MariaDB 10.2+ supports JSON (as an alias for LONGTEXT with check constraints). Prisma handles this, but verify your version.
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