对于没有从服务器获取数据或连接超时，我应该如何在我的数据库 python 代码中进行异常处理

Question

psycopg2.DatabaseError: could not receive data from server: Connection timed out

Answer 1

Wrap it inside try/except block. like:

try:
   conn = conn = dbapi.connect(user=<>,password=<>,host=<>,database=<>)
except psycopg2.DatabaseError:
   <whatever code>

Answer 2

you can use this code in your:

 def retrieve_data(db, table_name):
    try:
        comm ="SELECT * FROM {};".format(table_name)
        with db.connect() as conn:
            column_of_sql_table = conn.execute(comm).fetchall()
        return pd.DataFrame(column_of_sql_table)

    except Exception as e:
        print(e)
        return pd.DataFrame()

df = retrieve_data(db, table_name)
if not df.empty :
    < do what ever you want>
else: 
    < rise error>