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2025-03-31 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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Shulou(Shulou.com)06/01 Report--
1:array_filter checks whether each element is a number or not
If (array_filter ($this- > data ['log_id'],' is_numeric')! = $data ['log_id']) echo' 000'
2:concat connection string, ifnull, if usage
Update log
Set users = concat (ifnull (users,''), if (users,',411','411'))
Where log_id between 453729 and 453740
3:find_in_set queries whether id is in the id collection
SELECT
*
FROM
Log
WHERE
Log_id BETWEEN 453729
AND 453740 and! find_in_set ('2percent and if null (l.users, "))
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