no results to fetch, but the SELECT count(id) should always return result

[Vincent]

This is a bug tracker
If you have a question, such has "how do you do X with Python/PostgreSQL/psycopg2" please write to the mailing list or open a question instead.

Please complete the following information:

• OS: Ubuntu
• Psycopg version: 2.9.6
• Python version: 3.8
• PostgreSQL version: 13.5
• pip version pip3

Describe the bug
Please let us know:

1: what you did
2: what you expected to happen
3: what happened instead

If possible, provide a script reproducing the issue.

  def enforce_max_alert_count(self, new_alerts_count=0):
    try:
      self.check_and_connect()
      self.db_cursor.execute("SELECT count(id) from history_v02")
      row = self.db_cursor.fetchone()

in enforce_max_alert_count\n    row = self.db_cursor.fetchone()\npsycopg2.ProgrammingError: no results to fet
ch\n"

[Daniele Varrazzo]

You are doing something wrong in your code.

In [22]: import psycopg2

In [23]: conn = psycopg2.connect("")

In [24]: cur = conn.cursor()

In [25]: cur.execute("create table empty (id serial primary key)")

In [26]: cur.execute("select count(id) from empty")

In [27]: cur.fetchone()
Out[27]: (0,)