private void checkNoNullValues() { String sql = "SELECT COUNT(*) FROM " + table.getSQL() + " WHERE " + oldColumn.getSQL() + " IS NULL"; Prepared command = (Prepared) session.prepare(sql); ResultInterface result = command.query(0); result.next(); if (result.currentRow()[0].getInt() > 0) { throw DbException.get(ErrorCode.COLUMN_CONTAINS_NULL_VALUES_1, oldColumn.getSQL()); } }