Prisma Queries

Prisma Queries Skill

Patterns for querying data with Prisma Client.

Basic CRUD

Create

// Create single record
const user = await prisma.user.create({
  data: {
    email: 'john@example.com',
    name: 'John Doe',
  },
})

// Create with relations
const user = await prisma.user.create({
  data: {
    email: 'john@example.com',
    profile: {
      create: { bio: 'Hello!' },
    },
    posts: {
      create: [
        { title: 'First Post' },
        { title: 'Second Post' },
      ],
    },
  },
  include: {
    profile: true,
    posts: true,
  },
})

// Create many
const users = await prisma.user.createMany({
  data: [
    { email: 'user1@example.com' },
    { email: 'user2@example.com' },
  ],
  skipDuplicates: true,
})

Read

// Find by ID
const user = await prisma.user.findUnique({
  where: { id: userId },
})

// Find by unique field
const user = await prisma.user.findUnique({
  where: { email: 'john@example.com' },
})

// Find first matching
const user = await prisma.user.findFirst({
  where: { role: 'ADMIN' },
})

// Find many with conditions
const users = await prisma.user.findMany({
  where: {
    role: 'USER',
    createdAt: { gte: new Date('2024-01-01') },
  },
  orderBy: { createdAt: 'desc' },
  take: 10,
  skip: 0,
})

// Find or throw
const user = await prisma.user.findUniqueOrThrow({
  where: { id: userId },
})

Update

// Update by ID
const user = await prisma.user.update({
  where: { id: userId },
  data: { name: 'New Name' },
})

// Update many
const result = await prisma.user.updateMany({
  where: { role: 'GUEST' },
  data: { role: 'USER' },
})

// Upsert (create or update)
const user = await prisma.user.upsert({
  where: { email: 'john@example.com' },
  update: { name: 'John' },
  create: { email: 'john@example.com', name: 'John' },
})

Delete

// Delete by ID
const user = await prisma.user.delete({
  where: { id: userId },
})

// Delete many
const result = await prisma.user.deleteMany({
  where: { role: 'INACTIVE' },
})

Filtering

Comparison Operators

const users = await prisma.user.findMany({
  where: {
    age: { equals: 30 },
    age: { not: 30 },
    age: { gt: 18 },
    age: { gte: 18 },
    age: { lt: 65 },
    age: { lte: 65 },
    age: { in: [18, 21, 30] },
    age: { notIn: [0, 1] },
  },
})

String Filters

const users = await prisma.user.findMany({
  where: {
    name: { contains: 'john' },
    name: { startsWith: 'J' },
    name: { endsWith: 'Doe' },
    email: { mode: 'insensitive' },  // Case-insensitive
  },
})

Logical Operators

const users = await prisma.user.findMany({
  where: {
    AND: [
      { role: 'USER' },
      { active: true },
    ],
  },
})

const users = await prisma.user.findMany({
  where: {
    OR: [
      { role: 'ADMIN' },
      { role: 'MODERATOR' },
    ],
  },
})

const users = await prisma.user.findMany({
  where: {
    NOT: { role: 'GUEST' },
  },
})

Relation Filters

// Filter by related records
const users = await prisma.user.findMany({
  where: {
    posts: {
      some: { published: true },
    },
  },
})

const users = await prisma.user.findMany({
  where: {
    posts: {
      every: { published: true },
    },
  },
})

const users = await prisma.user.findMany({
  where: {
    posts: {
      none: { published: false },
    },
  },
})

// Count related
const users = await prisma.user.findMany({
  where: {
    posts: {
      some: {},
    },
    _count: {
      posts: { gt: 5 },
    },
  },
})

Relations

Include

// Include related records
const user = await prisma.user.findUnique({
  where: { id: userId },
  include: {
    posts: true,
    profile: true,
  },
})

// Nested include
const user = await prisma.user.findUnique({
  where: { id: userId },
  include: {
    posts: {
      include: {
        comments: true,
      },
    },
  },
})

// Filter included relations
const user = await prisma.user.findUnique({
  where: { id: userId },
  include: {
    posts: {
      where: { published: true },
      orderBy: { createdAt: 'desc' },
      take: 5,
    },
  },
})

Select

// Select specific fields
const user = await prisma.user.findUnique({
  where: { id: userId },
  select: {
    id: true,
    email: true,
    posts: {
      select: {
        id: true,
        title: true,
      },
    },
  },
})

Relation Count

const users = await prisma.user.findMany({
  include: {
    _count: {
      select: {
        posts: true,
        followers: true,
      },
    },
  },
})

Aggregation

Count

const count = await prisma.user.count({
  where: { role: 'USER' },
})

Aggregate

const result = await prisma.order.aggregate({
  _count: { _all: true },
  _sum: { total: true },
  _avg: { total: true },
  _min: { total: true },
  _max: { total: true },
  where: { status: 'COMPLETED' },
})

Group By

const result = await prisma.order.groupBy({
  by: ['status'],
  _count: { _all: true },
  _sum: { total: true },
  orderBy: {
    _count: { _all: 'desc' },
  },
})

// With having
const result = await prisma.order.groupBy({
  by: ['userId'],
  _sum: { total: true },
  having: {
    total: { _sum: { gt: 1000 } },
  },
})

Transactions

// Interactive transaction
const result = await prisma.$transaction(async (tx) => {
  const user = await tx.user.create({
    data: { email: 'new@example.com' },
  })

  await tx.profile.create({
    data: { userId: user.id, bio: 'Hello' },
  })

  return user
})

// Batch transaction
const [user, post] = await prisma.$transaction([
  prisma.user.create({ data: { email: 'new@example.com' } }),
  prisma.post.create({ data: { title: 'New Post', authorId: 'existing-id' } }),
])

Raw Queries

// Raw query
const users = await prisma.$queryRaw`
  SELECT * FROM users WHERE role = ${role}
`

// Raw execute
await prisma.$executeRaw`
  UPDATE users SET status = 'active' WHERE id = ${userId}
`

Integration

Used by:

• database-developer agent
• fullstack-developer agent

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