How to set a PDO statement attribute?

I have to use the each method to select in batches. The problem is, that I have to delete some columns in this foreach, which generates a table lock. Now I have to set the cursor PDO::ATTR_CURSOR to forward only PDO::CURSOR_FWDONLY. Is this even possible by now?

$simpleQuery = SimpleObject::find();
// need something like: $simpleQuery->setPdoStmtAttr(\PDO::ATTR_CURSOR, \PDO::CURSOR_FWDONLY);
foreach ($simpleQuery->each() as $simpleObject) {
    // fancy things...
}

Start at the SimpleObject::find() entry point and follow each() to where its PDO statement is created or configured. Determine how a caller could request PDO::ATTR_CURSOR with PDO::CURSOR_FWDONLY, then verify the behavior while iterating and deleting records in batches.