npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@ovotech/bigquery-pg-sink

v2.0.1

Published

Stream BigQuery query results into a postgres database

Downloads

54

Readme

BigQuery PG Sink

Stream the results of query made by nodejs-bigquery into a postgres database.

Using

yarn add @ovotech/bigquery-pg-sink

Creating a Sink

const pg = new Client('postgresql://postgres:[email protected]:5432/postgres');
const pgSink = new BigQueryPGSinkStream({
  pg: db,
  insert: insertQuery,
});

bigquery
    .createQueryStream('___BIGQUERY_QUERY_STRING___')
    .pipe(pgSink)

Creating insert functions

You can directly map each record returned to it a single insert query

import { RowMetadata } from '@google-cloud/bigquery';
import { BigQueryPGSinkStream, InsertBatch } from '@ovotech/bigquery-pg-sink';
import { Client } from 'pg';

export const insertQuery = (rows: RowMetadata): InsertBatch[] => {
  return rows.map(bigQueryResult => ({
    query: `INSERT INTO table
      (
        id,
        balance
      ) VALUES $1, $2
    `,
    values: [bigQueryResult.id, bigQueryResult.balance],
  }));

It is possible to speed up the insertion by using a bulk insert, however this would mean you need to programatically build up the query based on the size of the rows passed to your insertQuery function

import { RowMetadata } from '@google-cloud/bigquery';
import { BigQueryPGSinkStream, InsertBatch } from '@ovotech/bigquery-pg-sink';
import { Client } from 'pg';

export const insertQuery = (rows: RowMetadata): InsertBatch[] => {
  // transform each result into a flat array of values
  // i.e. [1, 200, 2, 300]
  const flatRows = rows.map(bigQueryResult => {
    return [
      bigQueryResult.id,
      bigQueryResult.balance,
    ]
  }).flat();
  
  // generate the values insert string
  // i.e. ($1,$2,$3,.....)
  const columns = [...Array(11)];
  const insertValuesString = rows
    .map(
      (_, rowIndex) =>
        `(${columns
          .map((row: any, index) => '$' + {index + 1 + rowIndex * columns.length})
          .join(',')})`,
    )
    .join(',');

  return [{
    query: `INSERT INTO table
      (
        id,
        balance
      ) VALUES ${insertValuesString}
    `,
    values: flatRows,
  }];
};

Coding style (linting, etc) tests

Style is maintained with prettier and tslint

yarn lint

Deployment

Deployment is preferment by lerna automatically on merge / push to master, but you'll need to bump the package version numbers yourself. Only updated packages with newer versions will be pushed to the npm registry.

Contributing

Have a bug? File an issue with a simple example that reproduces this so we can take a look & confirm.

Want to make a change? Submit a PR, explain why it's useful, and make sure you've updated the docs (this file) and the tests (see test folder).

License

This project is licensed under Apache 2 - see the LICENSE file for details