Hey, I've been recording timestamped log messages in sqlite3 by using
datetime('now') in INSERT queries, e.g.:
INSERT INTO Logs (...,time) VALUES (...,datetime('now'));
(The time column has type DATETIME.)
I noticed that if I retrieve these rows with a SELECT query the
datetimes only have per-second resolution, no fractions of a second,
e.g.: "2011-07-31 16:04:48"
I tried to retrieve fractions of a second with a SELECT query containing
a strftime with %f, e.g.:
SELECT strftime("%Y-%m-%d %H:%M:%f",time) FROM Logs;
but in the table returned all of the fractions of seconds are 000.
Am I correct in thinking that sqlite3 stores datetime('now') as a string
without milliseconds? Are the resolutions of sqlite's date and time
functions explicitly documented anywhere?
The solution seems to be to use strftime with %f in the INSERT query:
INSERT INTO Logs (...,time) VALUES (...,strftime('%Y-%m-%d
%H:%M:%f','now'));
then the results from SELECT queries will contain fractions of a second.
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