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Database Exceptionyii\db\Exception

SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

Error Info: Array
(
    [0] => HY000
    [1] => 2002
    [2] => Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
)