Android column '_id' does not exist?

Question

I\'m having trouble with something that works in the Notepad example. Here\'s the code from the NotepadCodeLab/Notepadv1Solution:

String[] from = new String[         


        

Answer 1

If you read the docs on sqlite, creating any column of type INTEGER PRIMARY KEY will internally alias the ROWID, so it isn't worth the trouble of adding an alias in every SELECT, deviating from any common utilities that might take advantage of something like an enum of columns defining the table.

http://www.sqlite.org/autoinc.html

It is also more straightforward to use this as the ROWID instead of the AUTOINCREMENT option which can cause _ID can deviate from the ROWID. By tying _ID to ROWID it means that the primary key is returned from insert/insertOrThrow; if you are writing a ContentProvider you can use this key in the returned Uri.