prisma-client-api-client-methods
Client Methods. Reference when using this Prisma feature.
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تعليمات المصدر · معاينة للقراءة فقط- name
- prisma-client-api-client-methods
- description
- Client Methods. Reference when using this Prisma feature.
- license
- MIT
- metadata
- {"author":"prisma","version":"7.0.0"}
# Client Methods
Prisma Client instance methods.
## $connect()
Explicitly connect to the database:
```typescript
const prisma = new PrismaClient({ adapter })
// Explicit connection
await prisma.$connect()
```
### When to use
Usually not needed - Prisma connects automatically on first query. Use for:
- Fail fast on startup
- Health checks
- Pre-warming connections
```typescript
async function main() {
try {
await prisma.$connect()
console.log('Database connected')
} catch (e) {
console.error('Failed to connect:', e)
process.exit(1)
}
}
```
## $disconnect()
Close database connection:
```typescript
await prisma.$disconnect()
```
### Graceful shutdown
```typescript
process.on('beforeExit', async () => {
await prisma.$disconnect()
})
// Or with SIGTERM
process.on('SIGTERM', async () => {
await prisma.$disconnect()
process.exit(0)
})
```
### In tests
```typescript
afterAll(async () => {
await prisma.$disconnect()
})
```
## $on()
Subscribe to events:
### Query events
```typescript
const prisma = new PrismaClient({
adapter,
log: [{ level: 'query', emit: 'event' }]
})
prisma.$on('query', (e) => {
console.log('Query:', e.query)
console.log('Params:', e.params)
console.log('Duration:', e.duration, 'ms')
})
```
### Log events
```typescript
const prisma = new PrismaClient({
adapter,
log: [
{ level: 'info', emit: 'event' },
{ level: 'warn', emit: 'event' },
{ level: 'error', emit: 'event' }
]
})
prisma.$on('info', (e) => console.log(e.message))
prisma.$on('warn', (e) => console.warn(e.message))
prisma.$on('error', (e) => console.error(e.message))
```
## $extends()
Add extensions for custom behavior:
### Add custom methods
```typescript
const prisma = new PrismaClient({ adapter }).$extends({
client: {
$log: (message: string) => console.log(message)
}
})
prisma.$log('Hello!')
```
### Add model methods
```typescript
const prisma = new PrismaClient({ adapter }).$extends({
model: {
user: {
async findByEmail(email: string) {
return prisma.user.findUnique({ where: { email } })
}
}
}
})
const user = await prisma.user.findByEmail('alice@prisma.io')
```
### Query extensions
```typescript
const prisma = new PrismaClient({ adapter }).$extends({
query: {
user: {
async findMany({ args, query }) {
// Add default filter
args.where = { ...args.where, deletedAt: null }
return query(args)
}
}
}
})
```
### Result extensions
```typescript
const prisma = new PrismaClient({ adapter }).$extends({
result: {
user: {
fullName: {
needs: { firstName: true, lastName: true },
compute(user) {
return `${user.firstName} ${user.lastName}`
}
}
}
}
})
const user = await prisma.user.findFirst()
console.log(user.fullName) // Computed field
```
### Chain extensions
```typescript
const prisma = new PrismaClient({ adapter })
.$extends(loggingExtension)
.$extends(softDeleteExtension)
.$extends(computedFieldsExtension)
```
## $transaction()
See `transactions.md` for details.
## $queryRaw() / $executeRaw()
See `raw-queries.md` for details.
## Type utilities
### Prisma namespace
```typescript
import { Prisma } from '../generated/client'
// Input types
type UserCreateInput = Prisma.UserCreateInput
type UserWhereInput = Prisma.UserWhereInput
// Output types
type User = Prisma.UserGetPayload<{}>
type UserWithPosts = Prisma.UserGetPayload<{
include: { posts: true }
}>
```
### Prisma.validator
Type-safe query fragments:
```typescript
import { Prisma } from '../generated/client'
const userSelect = Prisma.validator<Prisma.UserSelect>()({
id: true,
email: true,
name: true
})
const user = await prisma.user.findUnique({
where: { id: 1 },
select: userSelect
})
```
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