magnus/smon
1
0
Fork 0
Code Issues 1 Pull Requests Packages Projects Releases 6 Wiki Activity

Faster datapoint latest value display

Browse Source
This commit is contained in:
Magnus Åhall 2024-07-24 15:39:04 +02:00
parent f8a64e4dfd
commit 570ea064aa
2 changed files with 18 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
datapoint.go
View File

@ -162,8 +162,6 @@ func DatapointAdd[T any](name string, value T) (err error) { // {{{
return
}
service.Db.Conn.Exec(`UPDATE datapoint SET last_value = NOW(), nodata_is_problem = false WHERE id=$1`, dpID)
return
} // }}}
@ -172,30 +170,19 @@ func DatapointsRetrieve() (dps []Datapoint, err error) { // {{{
var rows *sqlx.Rows
rows, err = service.Db.Conn.Queryx(`
SELECT
dp.id,
dp.name,
dp.datatype,
dp.last_value,
dp.group,
dp.comment,
dp.nodata_problem_seconds,
dpv.id AS v_id,
dpv.ts,
dpv.value_int,
dpv.value_string,
dpv.value_datetime
FROM public.datapoint dp
LEFT JOIN (
SELECT
*,
row_number() OVER (PARTITION BY "datapoint_id" ORDER BY ts DESC) AS rn
FROM datapoint_value
) dpv ON dpv.datapoint_id = dp.id AND rn = 1
id, name, datatype, last_value, "group", comment, nodata_problem_seconds,
last_value_id AS v_id,
CASE
WHEN last_value_id IS NULL THEN null
ELSE last_value
END AS ts,
last_value_int AS value_int,
last_value_string AS value_string,
last_value_datetime AS value_datetime
FROM datapoint
ORDER BY
dp.group ASC,
dp.name ASC
"group" ASC,
name ASC
`)
if err != nil {
err = werr.Wrap(err)

6
sql/00026.sql
View File

@ -1,4 +1,5 @@
/* Adding last values to the datapoint table since they are a regularly used value. */
ALTER TABLE public.datapoint ADD COLUMN last_value_id int4 NULL;
ALTER TABLE public.datapoint ADD COLUMN last_value_int int8 NULL;
ALTER TABLE public.datapoint ADD COLUMN last_value_string varchar NULL;
ALTER TABLE public.datapoint ADD COLUMN last_value_datetime timestamptz NULL;
@ -8,12 +9,14 @@ ALTER TABLE public.datapoint ADD COLUMN last_value_datetime timestamptz NULL;
/* Once-run query to update it to the latest, to avoid user having to wait for the next entry. */
UPDATE public.datapoint AS dp
SET
last_value_id = dpv.id,
last_value_int = dpv.value_int,
last_value_string = dpv.value_string,
last_value_datetime = dpv.value_datetime
FROM (
SELECT
dp.id AS datapoint_id,
dpv.id,
dpv.value_int,
dpv.value_string,
dpv.value_datetime
@ -39,6 +42,9 @@ $$
BEGIN
UPDATE public.datapoint
SET
nodata_is_problem = false,
last_value = NEW.ts,
last_value_id = NEW.id,
last_value_int = NEW.value_int,
last_value_string = NEW.value_string,
last_value_datetime = NEW.value_datetime