我导致我的sqlite数据库在写入过程中崩溃一个应用程序而被锁定。以下是我如何修复它:

echo ".dump" | sqlite old.db | sqlite new.db

摘自:http://random.kakaopor.hu/how-to-repair-an-sqlite-database

删除-journal文件听起来是个糟糕的主意。它允许sqlite在崩溃后将数据库回滚到一致的状态。如果在数据库处于不一致状态时删除它，则会留下一个损坏的数据库。引用sqlite站点的一个页面:

If a crash or power loss does occur and a hot journal is left on the disk, it is essential that the original database file and the hot journal remain on disk with their original names until the database file is opened by another SQLite process and rolled back. [...] We suspect that a common failure mode for SQLite recovery happens like this: A power failure occurs. After power is restored, a well-meaning user or system administrator begins looking around on the disk for damage. They see their database file named "important.data". This file is perhaps familiar to them. But after the crash, there is also a hot journal named "important.data-journal". The user then deletes the hot journal, thinking that they are helping to cleanup the system. We know of no way to prevent this other than user education.

The rollback is supposed to happen automatically the next time the database is opened, but it will fail if the process can't lock the database. As others have said, one possible reason for this is that another process currently has it open. Another possibility is a stale NFS lock, if the database is on an NFS volume. In that case, a workaround is to replace the database file with a fresh copy that isn't locked on the NFS server (mv database.db original.db; cp original.db database.db). Note that the sqlite FAQ recommends caution regarding concurrent access to databases on NFS volumes, because of buggy implementations of NFS file locking.

我无法解释为什么删除一个-journal文件会让你锁定一个数据库，而你以前不能。这是可复制的吗?

顺便说一下，-journal文件的存在并不一定意味着发生了崩溃或有要回滚的更改。Sqlite有几种不同的日志模式，在PERSIST或TRUNCATE模式下，它始终保留-journal文件，并更改内容以指示是否有要回滚的部分事务。

获得此异常的一个常见原因是，当您试图执行写操作时，仍然为读操作保留资源。例如，如果你从一个表中选择，然后尝试更新你所选择的东西，而不是先关闭你的ResultSet。

这是因为该数据库上正在运行其他一些查询。SQLite是一个同步执行查询的数据库。如果其他人正在使用该数据库，那么如果你执行查询或事务，它就会给出这个错误。

因此，停止正在使用特定数据库的进程，然后执行查询。

我有一个工具“DB Browser for SQLite”正在运行，也在里面工作。显然，这个工具也会锁上东西。 在点击“写入更改”或“恢复更改”后，锁消失了，另一个进程(一个React-Native脚本)不再给出这个错误。

从您之前的评论中，您说存在一个-journal文件。

这可能意味着您已经打开和(EXCLUSIVE?)事务，还没有提交数据。是你的程序或者其他进程留下了-journal吗?

重新启动sqlite进程将查看日志文件，清除任何未提交的操作并删除-journal文件。