Question

in my dbHelper:

onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 

function I save one table to an external database.

Therefore I

1. attach and copy to the external database
2. delete the db file in this function and copy it from external
3. restore from external database to db.

this works until the function returns to getWritableDatabase()

Here I get this exception:

java.lang.IllegalStateException: no transaction pending

What is wrong? Thanks
Tata

Answer 1

The issue is that the onUpgrade method (as well as onCreate) occurs within a transaction, and at the end sets the transaction to be successful and ends it.

However, you have already ended the transaction in onUpgrade, resulting in this error.

Relevant code from SQLiteOpenHelper:

        ...
        if (version != mNewVersion) {
            db.beginTransaction();
            try {
                if (version == 0) {
                    onCreate(db);
                } else {
                    onUpgrade(db, version, mNewVersion);
                }
                db.setVersion(mNewVersion);
                db.setTransactionSuccessful();
            } finally {
                db.endTransaction();
            }
        }
        ...