由网友(那时雨°╮)分享简介：我创建一个数据库，辅助类和一些在它的方法，我只是查询数据库和其他人，我写它。I am creating a database helper class and for some of the methods within it I am only querying the database and others I...

我创建一个数据库，辅助类和一些在它的方法，我只是查询数据库和其他人，我写它。

I am creating a database helper class and for some of the methods within it I am only querying the database and others I am writing to it.

我的理解是这两种方法都起来打开数据库，并让程序要么只是读取或写入到数据库。

My understanding is both these methods will open the database up and let the program either just read or write to the database.

有关的查询语句是值得只是使用getReadableDatabase（）或有两个方法之间的性能差异很小。

For the query statements is it worth just using getReadableDatabase() or is there very little difference in performance between the two methods.

感谢您的时间。

推荐答案

他们返回相同的对象，除非磁盘已满或有一些权限错误的力量来打开只读模式数据库。这个名字是有点混乱，虽然:)

They return the same object unless the disk is full or there is some permission error that forces to open the database in read-only mode. The name is a bit confusing though :)

作为一个经验法则，你应该把任何调用UI线程之外的这些方法。这两种可能需要很长的时间来恢复。

As a rule of thumb you should put any call to these methods outside the UI thread. Both can take a long time to return.

如果您不打算写数据库只使用 getReadableDatabase ，因为这将有助于您的code清晰度和意向。

If you are not going to write the database just use getReadableDatabase as it will contribute to your code clarity and intention.

更多信息here.