try{
$dsn = "mysql:host=localhost;dbname=db_upan"; $dsn = "mysql:host=localhost;dbname=
$dsn = "mysql:host=localhost;dbname=db_upan"; $dsn = "mysql:host=localhost;dbname=
阅读背景：
Call to a member function fetch() on a non-object错误
来源：互联网
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