怎么重新连接mysql

mysql -u username -p

import mysql.connector

def connect_to_mysql():
    try:
        connection = mysql.connector.connect(
            host="localhost",
            user="username",
            password="password",
            database="database_name"
        )
        print("Successfully connected to MySQL")
        return connection
    except mysql.connector.Error as err:
        print(f"Error: '{err}'")
        return None

# 重新连接
connection = connect_to_mysql()
if connection:
    # 执行数据库操作
    cursor = connection.cursor()
    cursor.execute("SELECT * FROM table_name")
    result = cursor.fetchall()
    for row in result:
        print(row)
    cursor.close()
    connection.close()