PostgresDB 34000: Invalid Cursor Name
The specified cursor name is invalid.
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What is
PostgresDB 34000: Invalid Cursor Name
?
When encountering the error 34000: Invalid Cursor Name in Postgres, the immediate action to take is to check the scope and lifecycle of the cursor you are working with. Cursors in PostgreSQL have a specific scope and are bound to the transaction that created them. If you're trying to reference a cursor outside its transaction or if it was not properly declared, you will encounter this error.
- Check the transaction block: Ensure your cursor operations (DECLARE, FETCH, and CLOSE) are executed within the same transaction block. If you're not sure whether the cursor exists, you can use the following query within the same transaction to check if the cursor has been declared:
BEGIN;
-- Your DECLARE cursor statement here
-- Example: DECLARE mycursor CURSOR FOR SELECT * FROM my_table;
-- Attempt to fetch from the cursor to test its validity
FETCH ALL IN mycursor;
-- Remember to CLOSE the cursor if you're done
CLOSE mycursor;
COMMIT;- Investigate in pg_cursors: If you believe the cursor should be available, you can check
pg_cursorsto see if it’s listed there. This needs to be done in the same session where the cursor was supposed to be declared: SELECT * FROM pg_cursors;- This will list all cursors currently available in your session, including their names. Check if your cursor name appears in the list.
- Review cursor declaration: Ensure that the cursor is correctly declared before it is being fetched. A common mistake is attempting to fetch from a cursor before it's properly declared, or the declaration failed due to an error in the SQL syntax.
- Session-specific nature of cursors: Remember that cursors are session-specific. If you're trying to access a cursor from a different session than the one it was created in, it will not be accessible. Cursors cannot be shared across sessions.
- Syntax check: Verify the syntax of your cursor operations. A simple typo in the cursor name between the DECLARE, FETCH, and CLOSE commands could cause this error.
By following these steps, you should be able to identify and correct the issue with the cursor that is causing the 34000: Invalid Cursor Name error in PostgreSQL.
Attached error:
PostgresDB 34000: Invalid Cursor Name
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