Question

I use sqlite transaction in Android:

SQLiteDatabase database = sqlite_helper.getWritableDatabase();

database.beginTransaction();
...
database.setTransactionSuccessful();
database.endTransaction();

My questions are :
1. Should I place endTransaction() in finally code block like this：

try {
    database.beginTransaction();
    ...
    database.setTransactionSuccessful();
}
finally {
    database.endTransaction();
}

If there are exepctions during database operations, will the database be rolled back automatically without using “finally”?

1. When the transaction is not ended, can other threads read or write the same database? I hear sqlite in Android is threading safe, but I are not sure with it. I guess there will be some problems during transaction. Is there an error raised if another thread writes the same database with the same connection?
   I ever found this error in my app, but I don’t know whether it’s related to the threading safe problem:

android.database.sqlite.SQLiteMisuseException: library routine called out of sequence:

, while compiling

Does anyone help me to answer these questions? Thanks a lot!

Answer 1

1.you should always place endTransaction in finally block

2.transaction in SQLite is thread safe,see the doc http://www.sqlite.org/atomiccommit.html