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import mysql.connector # 连接到数据库 conn = mysql.connector.connect( host="主机名或IP地址", user="数据库用户名", password="数据库密码", database="数据库名" ) # 创建一个游标对象 mycursor = conn.cursor() # 定义查询字符串 query_str = "SELECT yu, rt FROM tablename" try: mycursor.execute(query_str) results = mycursor.fetchall() for row in results: yu, rt = row print(f"yu: {yu}, rt: {rt}") except Exception as e: print(f"An error occurred: {e}") finally: # 关闭游标和连接 mycursor.close() conn.close()