python 访问PG，异常处理

郑全

1.语句

  [postgres@eulersvr ~]$ cat except.py
# _*_ coding:utf-8 _*_
import psycopg2

conn= psycopg2.connect(database="postgres",user="postgres",password="postgres",host="192.168.0.38",port="5432")

cursor=conn.cursor()
sql="""delete  from emp1; """

params=(100,)

try:
  cursor.execute(sql,params)

except psycopg2.Error as er:
      print(er)

conn.commit()

cursor.close()

conn.close()

2.执行

  [postgres@eulersvr ~]$ python3 except.py
relation "emp1" does not exist
LINE 1: delete  from emp1;
                     ^

[postgres@eulersvr ~]$

3.验证

  [postgres@eulersvr ~]$ psql
psql (16.1)
Type "help" for help.

postgres=#
postgres=#
postgres=# \d
                 List of relations
Schema |        Name         |   Type   |  Owner   
--------+---------------------+----------+----------
public | emp                 | table    | postgres
public | emp_id_seq          | sequence | postgres
public | employees           | table    | postgres
public | employees_empid_seq | sequence | postgres
(4 rows)


我这里确实没有emp1 ，所以报错。