cursor.fetchone() returns 一个不在数据库中的值

Question

我正在运行一个来自 Python 的存储过程，它在 MYSQL 数据库上执行 SELECT 查询以确定记录是否已经存在。

执行后，我使用 cursor.fetchone() 将查询结果与变量值进行比较。但是，当我检查查询结果中保存的值时，它与我通过查询传递的参数相同，即使数据库中不存在该记录。

这当然应该是 None?

郑重声明，我传递的参数的方向为 IN，并且是一个整数。

我已经检查了 SO 的其余部分，我看到的所有此类问题都与我得到的相反！我还研究了 cursor.fetchone() 以确保我正确使用它，而且看起来我是。

如有任何帮助，我们将不胜感激！

table我正在查询

编号=1

名字=名字

存储过程

CREATE PROCEDURE `storedprocedure2`(IN `param` INT) NOT DETERMINISTIC CONTAINS SQL SQL SECURITY DEFINER

SELECT `This` 
FROM `That` 
WHERE `This` = param

查询调用

def loadintodatabase(self, connection, args):

    value1 = args[0]
    value2 = args[1]
    value3 = args[2]
    value4 = args[3]
    value5 = args[4]
    value6 = args[5]
    value7 = args[6]
    value8 = args[7] #this is a list
    value8length = len(value8)
    value9 = args[8] #this is also a list
    value9length = len(value9)
    id = 0
    i = 0
    idlist = [] #this is not related to the id variable
    idlistincrement = 0

    if value 8 != []:
        while i < value8length:
            cursor = connection.cursor()
            cursor.callproc('storedprocedure1', (value8[0], value8[1], value8[2])) #Inserts into a different table
            idlist.append(value8[0])
            cursor.close()
            connection.commit()
            i += 1

    i = 0
    if value3 != 0 and value4 is not None:            
         cursor = connection.cursor()
         cursor.callproc('storedprocedure2', (param,)) #lets say param holds 11 as an int, sproc is a select query
         result = cursor.fetchone() #result should be None but instead is (11L,)
         if result is None:
              id = None
         else:
             id = result[0]
         if id is None:
             cursor = connection.cursor()
             cursor.callproc('storedprocedure3', (value3, value4)) #sproc inserts into the table I just selected the id from
             cursor.close()
             connection.commit()

Answer 1

存储过程有点错误。

SELECT `This` 
FROM `That` 
WHERE `This` = param

应该是

BEGIN
SELECT `This` 
FROM `That` 
WHERE `This` = param;
END

现在 cursor.fetchone() returns None 符合预期！

cursor.fetchone() returns 一个不在数据库中的值

cursor.fetchone() returns a value that isn't in the database

python

mysql

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