在读事务中，没有变更需要提交，但是事务会防止对正在被读取的数据的修改，直到所有的读操作全部结束。

In a read transaction, there are no changes to commit, but the transaction prevents the data being read from changing until all of the reads are complete.

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当客户端完成文件操作时，它会提交数据(变更)和布局。

When the client is finished with the file, it commits the data (changes) and the layout.

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将变更提交到数据库。

Commit the change to the database.

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