mysql数据库句柄指什么

import mysql.connector

config = {
    'user': 'your_user',
    'password': 'your_password',
    'host': 'your_host',
    'database': 'your_database',
    'connect_timeout': 30  # 设置连接超时时间为30秒
}

try:
    conn = mysql.connector.connect(**config)
    cursor = conn.cursor()
    cursor.execute("SELECT * FROM your_table")
    result = cursor.fetchall()
    for row in result:
        print(row)
except mysql.connector.Error as err:
    print(f"Error: {err}")
finally:
    if conn.is_connected():
        cursor.close()
        conn.close()

try:
    conn = mysql.connector.connect(**config)
    cursor = conn.cursor()
    cursor.execute("SELECT * FROM your_table")
    result = cursor.fetchall()
    for row in result:
        print(row)
except mysql.connector.Error as err:
    print(f"Error: {err}")
finally:
    if cursor:
        cursor.close()
    if conn and conn.is_connected():
        conn.close()