Shulou(Shulou.com)05/31 Report--

This article introduces the relevant knowledge of "how to implement database transactions in Android". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

First of all, Android database operations, especially write operations, are very slow, and packaging all operations into a single transaction can greatly improve the processing speed.

The second is to ensure the consistency of the data, so that all operations in a transaction are executed successfully, or fail, or all operations are rolled back.

If you prefer to use other platforms (such as PHP + MySQL), the code usually runs on a powerful server and is generally not accidentally aborted, but on the Android platform, you will be surprised by unexpected abortions again and again. The Android system will kill the apps/threads/activities and interrupt the use of the database, and the battery will be exhausted or removed. Therefore, it is very important to use database things.

Implementing an Android database transaction is as simple as using only three methods of the SQLiteDatabase class.

◆ beginTransaction ()

◆ setTransactionSuccessful ()

◆ endTransaction ()

When endTransaction () is called, all operations starting with beginTransaction () are committed.

A simple database transaction operation is as follows:

MDatabase.beginTransaction (); try {/ / perform multiple database operations here / / an exception mDatabase.setTransactionSuccessful () may be thrown during execution; / / No database operation is performed between setTransactionSuccessful and endTransaction} catch (Exception e) {/ / when an error occurs in the database operation, you need to catch the exception and end the transaction mDatabase.endTransaction (); throw e } / / end a transaction mDatabase.endTransaction ();} "how to implement database transactions in Android" ends here. Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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