prisma_interactive_transaction_bank_transfer_with_balance_validation.ts

1import { PrismaClient } from '@prisma/client'
2
3const prisma = new PrismaClient()
4
5async function main() {
6  await prisma.$transaction(async (tx) => {
7    // 1. Decrement amount from the sender.
8    const sender = await tx.account.update({
9      data: {
10        balance: {
11          decrement: 100,
12        },
13      },
14      where: {
15        email: 'transfer-from@prisma.io',
16      },
17    })
18
19    // 2. Verify that the sender's balance didn't go below zero.
20    if (sender.balance < 0) {
21      throw new Error(`${sender.email} doesn't have enough money to send 100`)
22    }
23
24    // 3. Increment the amount to the recipient.
25    const recipient = await tx.account.update({
26      data: {
27        balance: {
28          increment: 100,
29        },
30      },
31      where: {
32        email: 'transfer-to@prisma.io',
33      },
34    })
35
36    return recipient
37  })
38}
39
40main()
41  .then(async () => {
42    await prisma.$disconnect()
43  })
44  .catch(async (e) => {
45    console.error(e)
46    await prisma.$disconnect()
47    process.exit(1)
48  })