// A Gorgon class - For the love of Zeus don't look directly at it!

//ha, you thought I was lazy didnt ya?!

struct core_unlocker
{
    core_unlocker(lock)
    {
        m_lock = lock
        unlock(lock)  //Abandon All Locks, Ye Who Enter Core!
    }
    ~core_unlocker()
    {
        lock(m_lock)
    }  
    private:
    Corelock m_lock;
}

在OLTP数据库事务的主要触发代码中找到:

-- This line negates the @inverseqty, which is the
-- negative of the @insertedquantity.  This works through the
-- magic of the trigger.  In fact, this code is a lot like
-- the bermuda triangle!
@negquantity = -1 * @inverseqty

注意上面代码中的bug;我只是证明了它是正确的，并没有尝试过。

这是唐纳德·克努斯写的。

long long ago; /* in a galaxy far far away */