skills

.agents/skills/prisma-database-setup/references/mysql.md

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+# MySQL Setup
+
+Configure Prisma with MySQL (or MariaDB).
+
+## Prerequisites
+
+- MySQL or MariaDB database
+- Connection string
+
+## 1. Schema Configuration
+
+In `prisma/schema.prisma`:
+
+```prisma
+datasource db {
+  provider = "mysql"
+}
+
+generator client {
+  provider = "prisma-client"
+  output   = "../generated"
+}
+```
+
+## 2. Config Configuration (v7)
+
+In `prisma.config.ts`:
+
+```typescript
+import { defineConfig, env } from 'prisma/config'
+
+export default defineConfig({
+  schema: 'prisma/schema.prisma',
+  datasource: {
+    url: env('DATABASE_URL'),
+  },
+})
+```
+
+## 3. Environment Variable
+
+In `.env`:
+
+```env
+DATABASE_URL="mysql://user:password@localhost:3306/mydb"
+```
+
+### Connection String Format
+
+```
+mysql://USER:PASSWORD@HOST:PORT/DATABASE
+```
+
+- **USER**: Database user
+- **PASSWORD**: Password
+- **HOST**: Hostname
+- **PORT**: Port (default 3306)
+- **DATABASE**: Database name
+
+## 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:
+   ```bash
+   npm install @prisma/adapter-mariadb mariadb
+   ```
+
+2. Instantiate Prisma Client with the adapter:
+   ```typescript
+   import 'dotenv/config'
+   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 })
+   ```
+
+## PlanetScale Setup
+
+PlanetScale uses MySQL but requires specific settings because it doesn't support foreign key constraints.
+
+In `prisma/schema.prisma`:
+
+```prisma
+datasource db {
+  provider     = "mysql"
+  relationMode = "prisma" // Emulate foreign keys in Prisma
+}
+```
+
+## Common Issues
+
+### "Too many connections"
+MySQL has a connection limit. Adjust connection pool size in URL:
+```env
+DATABASE_URL="mysql://...?connection_limit=5"
+```
+
+### JSON Support
+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.