How to use json_each in an ORM based query

[Sherif Fanous]

Hello,

I'm storing JSON documents in one of the columns of an SQLite table. The following query works fine if executed from the SQLite CLI

SELECT json_extract(value, '$.text') as channel_name
FROM channel, json_each(channel.json, '$.display_names')
WHERE json_extract(channel.json, '$.number') == 1

I've been trying to write this query using the ORM (session.query()) but am not able to wrap my head around how to do and after numerous failed attempts I've reverted to using Core and calling execute on a connection resource procured from the engine

connection.execute("SELECT json_extract(value, '$.text') AS channel_name "
                   "FROM channel, json_each(channel.json, '$.display_names') "
                   "WHERE json_extract(channel.json, '$.number') == 1")

Is it possible to write this query using the ORM?

Thanks

[Sherif Fanous]

Guess I had to write this post to figure out the answer!!!!

Here's the query in ORM

session.query(func.json_extract(text('value'), '$.text').label('channel_name')).select_from(Channel, func.json_each(Channel.json, '$.display_names')).filter(func.json_extract(Channel.json, '$.number') == 1).all()

[Mike Bayer]

On Mon, Apr 8, 2019 at 3:25 PM Sherif Fanous <sherif...@gmail.com> wrote:
>
> Guess I had to write this post to figure out the answer!!!!
>
> Here's the query in ORM
>
> session.query(func.json_extract(text('value'), '$.text').label('channel_name')).select_from(Channel, func.json_each(Channel.json, '$.display_names')).filter(func.json_extract(Channel.json, '$.number') == 1).all()

OK does that work though? The json_each() thing is not fully
supported and there is a recipe at
https://github.com/sqlalchemy/sqlalchemy/issues/3566#issuecomment-441931331
I've had users using for years against PostgreSQL.

We do want to add better support for functions you SELECT from but
it's a long term TODO.

>
>
> On Monday, April 8, 2019 at 3:03:22 PM UTC-4, Sherif Fanous wrote:
>>
>> Hello,
>>
>> I'm storing JSON documents in one of the columns of an SQLite table. The following query works fine if executed from the SQLite CLI
>>
>> SELECT json_extract(value, '$.text') as channel_name
>> FROM channel, json_each(channel.json, '$.display_names')
>> WHERE json_extract(channel.json, '$.number') == 1
>>
>> I've been trying to write this query using the ORM (session.query()) but am not able to wrap my head around how to do and after numerous failed attempts I've reverted to using Core and calling execute on a connection resource procured from the engine
>>
>> connection.execute("SELECT json_extract(value, '$.text') AS channel_name "
>> "FROM channel, json_each(channel.json, '$.display_names') "
>> "WHERE json_extract(channel.json, '$.number') == 1")
>>
>> Is it possible to write this query using the ORM?
>>
>> Thanks
>

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[Sherif Fanous]

It's worked against every case I've tried it so far.

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