Is there a database link error with php Database Exception Caused by: PDOException?

I am a student of java, and my teacher gave me a php project (I don"t understand that php), has made a mistake, as shown in the following picture, ask for help from the great gods.



usename = "root";password = 1234;php

dbname=demo

Php
Mar.07,2021

the database connection failed. Check the database configuration information in your configuration file
configuration file location common/config/main-local.php

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-64f5-1b35d3c-2b740.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35d3c-2b740.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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