如何在Android sqlite中的现有行之前插入新行？

Question

My table is not sorted and I keep it sorted in the code logic.

I would like to insert a new row at the beginning of the table - before any other existing row. Is there a way to do this? Thanks.

Answer 1

SQL tables do not have a defined order; to return rows in a specific order, you must use an ORDER BY clause.

In SQLite, table rows are stored in the order of their internal rowid (which is also the value of the INTEGER PRIMARY KEY column, if any). To store a row before all other rows, insert the new row with a rowid value that is smaller than all others:

INSERT INTO MyTable(rowid, Name, Comment)
VALUES ((SELECT MIN(rowid) FROM MyTable) - 1, 'me', 'first!');

(Please note that the first paragraph still applies; storage order is not guaranteed to be query order. You still need to use ORDER BY.)

Answer 2

If you want to do it regularly (like when you want to show latest content first) you can store it normally but reverse the data with query like this.

select * from MYTABLE ORDER BY _id DESC 

this query give you the latest row first.