Limit an sqlite Table's Maximum Number of Rows

Question

I am looking to implement a sort of \'activity log\' table where actions a user does are stored in a sqlite table and then presented to the user so that they can see the lat

Answer 1

Another solution is to precreate 100 rows and instead of INSERT use UPDATE to update the oldest row.
Assuming that the table has a datetime field, the query

UPDATE ...
WHERE datetime = (SELECT min(datetime) FROM logtable)

can do the job.

Edit: display the last 100 entries

SELECT * FROM logtable
ORDER BY datetime DESC
LIMIT 100

Update: here is a way to create 130 "dummy" rows by using join operation:

CREATE TABLE logtable (time TIMESTAMP, msg TEXT);
INSERT INTO logtable DEFAULT VALUES;
INSERT INTO logtable DEFAULT VALUES;
-- insert 2^7 = 128 rows
INSERT INTO logtable SELECT NULL, NULL FROM logtable, logtable, logtable,
   logtable, logtable, logtable, logtable;
UPDATE logtable SET time = DATETIME('now');