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Kysely Transactions

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Short and simple examples of how to use transactions.

Simple transaction

Schema

import { Generated } from 'kysely'


declare global {
  interface DB {
    person: PersonTable
    pet: PetTable
  }


  interface PersonTable {
    id: Generated<string>
    first_name: string
    last_name: string | null
    created_at: Generated<Date>
    age: number
  }


  interface PetTable {
    id: Generated<string>
    name: string
    owner_id: string
    species: 'cat' | 'dog'
    is_favorite: boolean
  }
}

Querying

const catto = await db.transaction().execute(async (trx) => {
  const jennifer = await trx.insertInto('person')
    .values({
      first_name: 'Jennifer',
      last_name: 'Aniston',
      age: 40,
    })
    .returning('id')
    .executeTakeFirstOrThrow()


  return await trx.insertInto('pet')
    .values({
      owner_id: jennifer.id,
      name: 'Catto',
      species: 'cat',
      is_favorite: false,
    })
    .returningAll()
    .executeTakeFirst()
})

Result

/* execute() has been called multiple times. */


---- #1 ----
INSERT INTO
  "person" ("first_name", "last_name", "age")
VALUES
  ($1, $2, $3)
RETURNING
  "id"


-- Parameters
-- [1] Jennifer
-- [2] Aniston
-- [3] 40




---- #2 ----
INSERT INTO
  "pet" ("name", "species", "is_favorite")
VALUES
  ($1, $2, $3)
RETURNING
  *


-- Parameters
-- [1] Catto
-- [2] cat
-- [3] false