Question

我有一个程序在＆＃39; serverlist.txt＆＃39;中运行一系列名称。用户通过选择选项1或选项2来选择要搜索的数据库。该程序将遍历列表中的所有名称，并提供与每个名称绑定的ID。

姓名：木星ID：23 姓名：火星ID：26 名称：水星ID：27

这很好但但并没有停止。当列表完成后，它会重新遍历所有内容。

如何阻止它多次浏览列表？

import pypyodbc
import os

def replaceid(connection, servername):
    try:
        cursor = connection.cursor()

        SQLCommand = ("SELECT Name, Location_ID "
            "FROM dbo.Server_ID "   # table name
            "with (nolock)"
            "WHERE Name = ?")
        Values = [servername]
        cursor.execute(SQLCommand,Values)
        results = cursor.fetchone()
        if results:

            print (" Name: " + results[0] + " ID: " + str(results[1]))
            print (" ")
            locationid(results, connection, servername)
        else:
            print (" ID for " + servername + " does not exist.")
            print (" ")
            connection.close()
    except:
        print("Database is down or you are not connected to network.")
        exit()

def start1():

    os.system('cls' if os.name == 'nt' else 'clear')
    array = []
    local = input('\n\n Type option 1 or 2: ')
    while True:
        with open("serverlist.txt", "r") as f:
            for servername in f:
                try:                

                    if local in ['1']:
                        connection = pypyodbc.connect('Driver={SQL Server};Server=db1;Database=WinOasis;Trusted_Connection=yes;')
                    elif local in ['2']:
                        connection = pypyodbc.connect('Driver={SQL Server};Server=db2;Database=WinOasis;Trusted_Connection=yes;')
                    else:
                        return
                except pypyodbc.Error as ex:
                    sqlstate = ex.args[0]
                    if sqlstate == '28000':
                        print ("You do not have access.")

                replaceid(connection, servername.strip())
    return

start1()

Answer 1

我认为你在第三行到最后一行的return语句需要缩进一级。否则你的while循环将永远运行，因为True将永远是真的！

Answer 2

在replaceid(connection, servername.strip())

中调用start1()后，您可能需要添加一个中断语句

在异常子句结束后，您可能还需要一个break语句。

如何正确退出循环？

2 个答案: