怎么访问云服务器数据库数据

import psycopg2

try:
    # 连接到PostgreSQL数据库
    connection = psycopg2.connect(
        host="your_database_host",
        database="your_database_name",
        user="your_database_user",
        password="your_database_password"
    )

    # 创建一个cursor对象
    cursor = connection.cursor()

    # 执行SQL查询
    postgreSQL_select_Query = "select * from your_table_name"

    cursor.execute(postgreSQL_select_Query)
    print("Selecting rows from table using cursor.fetchall")
    records = cursor.fetchall()

    print("Print each row and it's columns values")
    for row in records:
        print("Data", row)

except (Exception, psycopg2.Error) as error:
    print("Error while connecting to PostgreSQL", error)

finally:
    # 关闭数据库连接
    if connection:
        cursor.close()
        connection.close()
        print("PostgreSQL connection is closed")