An attempt to attach an auto-named database for file D:\project_c#\NEWS_WEBSITE2\App_Data\NewsDatabase.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.
时间: 2024-03-08 19:44:55 浏览: 33
这个错误通常是因为你在连接数据库时指定的数据库名称已经存在了,或者指定的数据库文件无法打开,或者数据库文件位于 UNC 共享文件夹中。建议你检查一下连接字符串中的数据库名称是否正确,并且确保该数据库文件可以被访问和打开。如果你确认一切都正确,那么可能是数据库文件被其他进程占用,你需要关闭占用该文件的进程或者重命名数据库文件。
相关问题
The header for file 'D:\bookshop\bookstoredb.mdf' is not a valid database file header. The FILE SIZE property is incorrect. An attempt to attach an auto-named database for file D:\bookshop\bookstoredb.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.”
这个错误可能是由于你的数据库文件已经被另一个应用程序或服务占用了,或者你的数据库文件已经被破坏了。你可以尝试以下解决方法:
1. 确保你的数据库文件没有被其他应用程序或服务占用,例如SQL Server服务。
2. 检查你的数据库文件是否已经被破坏,你可以尝试使用SQL Server Management Studio的“附加”功能来尝试修复数据库文件。
3. 将你的数据库文件重命名为其他名称,然后重新运行你的应用程序来创建一个新的数据库文件。
4. 如果你的数据库文件已经被破坏,你可以尝试使用SQL Server Management Studio的“修复”功能来修复它。
5. 如果你的数据库文件已经被破坏且无法修复,你可以尝试从备份中还原数据库文件。
java.lang.IllegalStateException: attempt to re-open an already-closed object: SQLiteDatabase:
This error occurs when you try to access a closed SQLiteDatabase object. This can happen when you try to perform a database operation on a SQLiteDatabase object which has already been closed.
To resolve this error, you need to ensure that you are not trying to access a closed SQLiteDatabase object. You can do this by checking the state of the SQLiteDatabase object before performing any operation on it.
Here is an example of how you can avoid this error:
1. Open the SQLiteDatabase object:
```
SQLiteDatabase db = dbHelper.getWritableDatabase();
```
2. Check the state of the SQLiteDatabase object:
```
if (db.isOpen()) {
// Perform database operations here
} else {
// Handle the case where the SQLiteDatabase object is closed
}
```
3. Close the SQLiteDatabase object when you are done with it:
```
db.close();
```
By following these steps, you can avoid the IllegalStateException: attempt to re-open an already-closed object: SQLiteDatabase error.
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