Question

I’m implementing an application for Mac OS X to easily access to SQLite databases. Since the user will be able to work on more files at the same time, I opted for a document based application.

Most books and tutorials explain how to create and read data in such a context from a file using NSData. My app, instead, should rely on the SQLite library for that purpose.
What are the methods I should override in order to do this?

Answer 1

Only -[NSDocument readFromURL:ofType:error:]. I suppose every change is saved automatically (SQLite), so you don’t need a save action.

I have also done this and I liked it pretty much.

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For example:

- (BOOL)readFromURL:(NSURL *)URL ofType:(NSString *)type error:(NSError **)error {
  if (sqlite3_open_v2([[URL path] UTF8String], &db, SQLITE_OPEN_READWRITE, NULL) != SQLITE_OK) {
    sqlite3_close(db);
    return NO;
  }
  return YES;
}