postgres：在删除表之前选择并返回结果

Question

我有以下sql，我想返回所选数据

insert into test(id,name) select * from tmp_tbl on conflict(id) do update set name = EXCLUDED.name;
with selected_data as (select * from tmp_tbl) select * from selected_data;
drop table if exists tmp_tbl;

这是Python代码：

with psycopg.connect(self.connect_str, autocommit=True) as conn:
    with conn.cursor() as cur:
        cur.execute(sql_full)
        rows = cur.fetchall()
        colnames = [desc[0] for desc in cur.description]
        df_result = pd.DataFrame(rows, columns=colnames)                                       
        return df_result

这会产生错误：

 File "/usr/local/lib/python3.12/site-packages/psycopg/cursor.py", line 223, in fetchall
    self._check_result_for_fetch()
  File "/usr/local/lib/python3.12/site-packages/psycopg/_cursor_base.py", line 588, in _check_result_for_fetch
    raise e.ProgrammingError("the last operation didn't produce a result")
psycopg.ProgrammingError: the last operation didn't produce a result

我可以直接在 sql 客户端（dbweaver）中执行该 sql 并且它可以工作。但 python/psycopg 代码没有。 任何帮助表示赞赏

Answer 1

尝试在末尾添加另一个表达式：

SELECT 1 FROM TABLE_NAME