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.
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。
To make sure that either both statements take effect or none, the applications are run in such a manner that no changes are made to the database until a COMMIT occurs.
为了确保两条语句都能够生效或都不生效，应用程序将以这样的方式运行：直到COMMIT发生之前，数据库不会做出任何更改。
If you do not do so, you'll see a message along the lines of abort: no username supplied... when you try to commit changes, and your changes will not be committed.
如果不这么做，在尝试提交更改时会看到包含abort：no usernamesupplied…的消息，更改不会提交。
If you do not do so, you'll see a message along the lines of abort: no username supplied... when you try to commit changes, and your changes will not be committed.
如果不这么做，在尝试提交更改时会看到包含abort：no usernamesupplied…的消息，更改不会提交。
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