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#80 ✓ resolved
Jean-Baptiste Quenot

itersize not honored when using named cursor with RealDictCursor

Reported by Jean-Baptiste Quenot | December 2nd, 2011 @ 03:13 PM

Consider the following program with the default implementation of RealDictCursor:

import psycopg2.extras
conn = psycopg2.connect('dbname=test', connection_factory=psycopg2.extras.RealDictConnection)
curs = conn.cursor('unique_name')
curs.itersize = 2000
curs.execute("select * from foo limit 25")
curs.fetchone()

The output with PSYCOPG_DEBUG=1 contains the following lines:

[0x7f603d53c700]     FETCH FORWARD 1 FROM "unique_name"

I have to override the Cursor class like this to fetch the proper number of rows:

class Cursor(psycopg2.extras.RealDictCursor):
    def next(self):
        return psycopg2.extras._cursor.next(self)

class Connection(psycopg2.extras._connection):
    """A connection that uses `Cursor` automatically."""
    def cursor(self, name=None):
        if name is None:
            return psycopg2.extras._connection.cursor(self, cursor_factory=Cursor)
        else:
            return psycopg2.extras._connection.cursor(self, name, cursor_factory=Cursor)

conn = psycopg2.connect('dbname=test', connection_factory=Connection)
...

The debug output is OK:

[0x7f86ba488700]     FETCH FORWARD 2000 FROM "unique_name"

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Psycopg is the most used PostgreSQL adapter for the Python programming language. At the core it fully implements the Python DB API 2.0 specifications. Several extensions allow access to many of the features offered by PostgreSQL.

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