Question

我使用MySQL C Connector在Visual C ++中编写。

当我在StringCchPrintf这个查询并执行并获得结果时，就可以了。

SELECT orders.id, 
orders.get_date, 
orders.work_date, 
cars.car_num, 
cars.car_mark, 
customers.surname, 
customers.name, 
customers.telephone, 
workers.login, 
orders.paid, 
orders.paid_dead_line 
FROM `orders`, `cars`, `customers`, `workers` 
WHERE cars.customer_id = customers.id AND 
orders.car_id = cars.id AND 
orders.customer_id = customers.id AND 
orders.worker_id = workers.id AND 
DATE(get_date) LIKE DATE('%d-%d-%d') 
ORDER BY get_date ASC;

当我在StringCchPrintf下面的查询时 - 程序没有调用自由函数[1]，当我再次按下按钮时，我的应用程序崩溃了。

SELECT orders.id, 
orders.get_date, 
orders.work_date, 
cars.car_num, 
cars.car_mark, 
customers.surname, 
customers.name, 
customers.telephone, 
workers.login, 
orders.paid, 
orders.paid_dead_line 
FROM `orders`, `cars`, `customers`, `workers`  
WHERE orders.paid IN ('0', '2', '3') AND //1 == paid
cars.customer_id = customers.id AND 
orders.car_id = cars.id AND 
orders.customer_id = customers.id AND 
orders.worker_id = workers.id
ORDER BY get_date ASC;

[1]我在while ((row = mysql_fetch_row(result)))之后放置了MessageBox并且没有显示消息框，因此不会调用清除函数，并且第二个按钮推送程序崩溃。从数据库获取数据并显示是在单独的void函数中。

我的问题：

错误的查询语法会导致程序崩溃吗？

在清理之前，程序是否会脱离无效功能（奇怪）？

问候，大卫

Answer 1

WHERE子句的最后一行有一个额外的AND。改变这一行：

orders.worker_id = workers.id AND

对此：

orders.worker_id = workers.id

MySQL查询中的许多条件导致崩溃？

1 个答案: