Get streamed data from raw query

Issue type:

[X] question [ ] bug report [ ] feature request [ ] documentation issue

Database system/driver:

[ ] cordova [ ] mongodb [ ] mssql [ ] mysql / mariadb [ ] oracle [X] postgres [ ] sqlite [ ] sqljs [ ] react-native [ ] expo

TypeORM version:

[X] latest [ ] @next [ ] 0.x.x (or put your version here)

Steps to reproduce or a small repository showing the problem:

Hello,

Is there a way to get streamed data from a raw query? I am calling a stored procedure that return a table of some hundred thousands of lines and write the data to a .csv file. Here is the syntax of the query in postgresql:

SELECT * FROM get_message_for_enterprise(10)

I can get the result in form of list with EntityManager.query but that will use too much memory.

It would be simple if I could use QueryBuilder to create this kind of query but it doesn’t seem to be possible.

Any hints on how to do this please?

Cheers, David

[vlapo]

You can use connection.manager.queryRunner.stream("SELECT * FROM get_message_for_enterprise(10)"); function for now.

But I think this is relevant request and maybe we should add stream method to manager and repository api.

[vlapo]

@pleerock Should we not expose stream method in EntityManager same as query method?