Access to the database file is not allowed. [ File name = **
今天，在连接数据库的时候，遇到了一个比较奇怪的问题，而且这个问题 现在出错的原理现在我还是搞不清，但是初步有了一个解决方案。 打开程序的时候，然后很习惯的想把数据打开，这个时候数据打不开 说是： 数据源连接已经被打开。 我就很纳闷了，然后想不管
今天，在连接数据库的时候，遇到了一个比较奇怪的问题，而且这个问题 现在出错的原理现在我还是搞不清，但是初步有了一个解决方案。
打开程序的时候，然后很习惯的想把数据打开，这个时候数据打不开 说是：数据源连接已经被打开。
我就很纳闷了，然后想不管它了，就直接运行，坑爹的，报错了。
没有访问权限？我是在我的机器上面呢。
行，没访问权限，那照着它的说法，那就改成有访问权限咯。于是找到放我数据库的文件夹，点击属性（properties），然后找到安全这项（Security）如下：
图一：打开 properties，点击“Edit” 按钮，会弹出图二的图片。
图二：接着点“Add”按钮。
图三：到了这一步 在点击“Advanced” 也就是中午 高级选项。
图四：点击“Find Now” 按钮，会在“Search result”列表中列出所有的用户。选择 “everyone” 然后点击“OK”。这一步是重中之重。
图五：然后可以在Group or user names里看到我们添加的用户。然后再下面的“Permissions for Everyone” 也就是设置权限里，选择“Full Control”，就OK了，这一步也是很关键的。
通过上面的设定，就可以访问我们的数据。另外有的时候，这样做还是不行？怎么办呢？那可能是你的数据库文件被设定成了只读，只需要再你的数据库文件上 右键，把
“只读”（read-only）去掉就可以了。
希望对你有点帮助，谢谢 晚安。
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