What data type should I use to save $connection- > id in workerman to mysql?

it"s wrong for me to use varchar to read it out, so what should I use?

problem description

the varvhar that saves $connection- > id to mysql is a simple number that can no longer be used.

the environmental background of the problems and what methods you have tried

related codes

/ / Please paste the code text below (do not replace the code with pictures)
"insert into Connection values ("$CabinetId","$deviceid","$datetime","$ConnId")";

what result do you expect? What is the error message actually seen?

it is hoped that the read id data can be used to use

Jul.26,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2bc9c-2bacb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2bc9c-2bacb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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