MagicStack / MagicStack/asyncpg
Get number of rows in cursor ? (equivalent to psycopg2#cursor.rowcount)
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Description
- asyncpg version: 0.15
- PostgreSQL version: 9.6
- Python version: 3.6.5
- Platform: Debian Buster
- Do you use pgbouncer?: no
- Did you install asyncpg with pip?: no
- Can the issue be reproduced under both asyncio and uvloop?: N/A
Warning: It's may be a duplicate of #311
I would like to get the number of rows from the last query (a SELECT query). An equivalent to cursor.rowcount in psycopg2.
I saw in #311 that we can get the query status line (as a string) from execute function. Actually, I'm not able to use it since I need a cursor. Don't know very well binary protocol of pg.. I don't even know if it is possible to get it.
The purpose of this issue is to avoid doing multiple queries (for instance with count(*) statement).
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the cursor API and the execute function, then review the PostgreSQL status-line behavior referenced in the issue. Determine whether a cursor can expose the row count from its last SELECT without an additional count(*) query, and add coverage for the requested behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- postgresql, python
- Domain
- database
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100