数据库如何更换域名

import psycopg2

# 旧的数据库连接字符串
old_connection_string = "dbname=mydb user=myuser password=mypassword host=olddomain.com port=5432"

# 新的数据库连接字符串
new_connection_string = "dbname=mydb user=myuser password=mypassword host=newdomain.com port=5432"

try:
    # 尝试使用新的连接字符串连接数据库
    conn = psycopg2.connect(new_connection_string)
    print("连接成功")
except psycopg2.Error as e:
    print(f"连接失败: {e}")

import time
import psycopg2

new_connection_string = "dbname=mydb user=myuser password=mypassword host=newdomain.com port=5432"

for i in range(5):
    try:
        conn = psycopg2.connect(new_connection_string)
        print("连接成功")
        break
    except psycopg2.OperationalError as e:
        if "could not translate host name" in str(e):
            print(f"DNS解析失败，等待5秒后重试 ({i+1}/5)")
            time.sleep(5)
        else:
            print(f"连接失败: {e}")
            break