简而言之,我有一个包含2000万行的csv文件,行长度不同。这是由于过时的数据记录器和专有格式导致的。我们得到的结果是一个csv文件,格式如下。我的目标是将此文件插入到Postgres数据库中。我该如何做到以下几点:
- 保留前8列和最后2列,以使CSV文件一致
- 在CSV文件的第一或最后位置添加新列。
1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50
1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0, img_id.jpg, -50
1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50
1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50
1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50
1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50
1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50
1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50
1, 2, 3, 4, 5, 0,0,0,0,0,0, img_id.jpg, -50
1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0 img_id.jpg, -50