Question

I want to create some methods to begin, commit or rollback a transaction in Xcode.

I want to know which methods of sqlite3 library I have to use.

Is it OK to use sqlite3_prepare_v2?
Or sqlite3_readonly_stmt?

Answer 1

You can do that by executing the following self-explanatory commands in SQLite: begin immediate transaction, commit transaction and rollback transaction.

Note: I’ve used the immediate transaction behavior. For information about it and the other ones (deferred, exclusive), take a look here.

To execute the command in Objective-C, use this (where sql contains one of the above commands as an NSString; and db is your database handle – sqlite3*):

if (sqlite3_exec(db, [sql UTF8String], NULL, NULL, NULL) != SQLITE_OK) {
  // deal with error...
}