kysely/dist/dialect/postgres/postgres-adapter.js

Type safe SQL query builder

/// <reference types="./postgres-adapter.d.ts" />
import { sql } from '../../raw-builder/sql.js';
import { DialectAdapterBase } from '../dialect-adapter-base.js';
const LOCK_ID = BigInt('3853314791062309107');
const LOCK_TIMEOUT_MILLISECONDS = 60 * 60 * 1_000;
export class PostgresAdapter extends DialectAdapterBase {
    get supportsTransactionalDdl() {
        return true;
    }
    get supportsReturning() {
        return true;
    }
    async acquireMigrationLock(db, _opt) {
        // in 1 RTT, acquire a session-level advisory lock with a timeout.
        //
        // if ever this runs inside a transaction, niche edge case we support - the
        // user is responsible to set a different timeout value or disable (`0` value).
        await sql `
    with set_timeout as (
      select set_config('lock_timeout', '${sql.lit(LOCK_TIMEOUT_MILLISECONDS)}', true) as config_val
    )
    select pg_advisory_lock(${sql.lit(LOCK_ID)})
    from set_timeout`.execute(db);
    }
    async releaseMigrationLock(db, _opt) {
        await sql `select pg_advisory_unlock(${sql.lit(LOCK_ID)})`.execute(db);
    }
}