Use an existing pg.Client connection

How can I get a typeorm Connection (or EntityManager) from an existing connection created with the pg library?

https://github.com/brianc/node-postgres/wiki/Client

For example, I want to do something like:

import * as pg from 'pg';

const client = new pg.Client('postgres://brian:mypassword@localhost:5432/dev');
client.connect(async () => {
    // Do some SQL queries with client...
    await insertPhotosSql(client);

    // Now I want to do some typeorm queries using same connection:
    const connection = ???(client);
    let allPhotos = await connection.entityManager.find(Photo);
});

[sagidM]

@pleerock Hi Umed. I want to make another argument about existing connection. I work in a big tech company which, as many other such ones, uses a lot of inner libraries. Right now we try to move little by little to TypeORM, but in an existing project, there are many functions that work with DB.

For example, say we have functions like (without TypeORM)

someTransaction(() => {
  createEntity1(params: Entity1Params)
  createEntity2(params: Entity2Params)
})

Then we created Entity1 via TypeORM but not Entity2. So as we want to make a smooth transition to the framework, we can’t just use TypeORM in that case because they are 2 different drivers (e.g. pg Client/Pool).

I can do a PR with passing in the existing client, at least for pg, but not sure whether the core team is open for such changes. Is it?

[leighman]

I want to provide pg.Client as I am monitoring that instance using zipkin and jaeger.

Hi @pleerock, would also be interested in this. Thanks.