iOS SQLite FMDB Transactions.. Correct usage?

Question

I'm just going to try out using transactions with the FMDB SQLite iOS wrapper.

The documentation is a little vague on transactions but from having a quick look at some functions I have come up with the following logic:

[fmdb beginTransaction];
    // Run the following query
    BOOL res1 = [fmdb executeUpdate:@"query1"];
    BOOL res2 = [fmdb executeUpdate:@"query2"];

if(!res1 || !res2) [fmdb rollback];
else [fmdb commit];

Answer 1

You could also use FMDatabaseQueue to handle your transactions, which is part of fmdb:

[queue inTransaction:^(FMDatabase *db, BOOL *rollback) {
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:1]];
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:2]];
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:3]];

    if (whoopsSomethingWrongHappened) {
        *rollback = YES;
        return;
    }
    // etc…
    [db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:4]];
}];

Documentation