How do I increment or decrement a column in a update query in Flutter using Drift-CodePudding

I want to directly update the concerned lines. How do I do that without having to select the items and updating them one by one in Drift? My current code:

      final concernedSongs = await (select(playlistSongs)
            ..where((tbl) => tbl.order.isBetweenValues(low   1, high)))
          .get(); // should just update and decrement the values without reiterating over them

      concernedSongs.forEach((song) {
        reOrder(song.id, song.order - 1);
      });

CodePudding user response：

This is not possible with only dart code at the moment. You should look into using a customStatement. Something like:

await db.customStatement(
  "UPDATE 'songs' SET order = order - 1 WHERE order > ? AND order < ?",
  [low   1, high],
);

CodePudding user response：

You can use custom queries, Reference To Docs

this query may help you to get some idea,

        await db.customStatement("update 'songs' 
        set order = order-1 where order between ? and ?",
        [low 1,high]);