连接失败: SQLSTATE[HY000] [2002] 由于目标计算机积极拒绝，无法连接。
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<b>Fatal error</b>:  Uncaught Error: Call to a member function prepare() on null in D:\wwwroot\qzsenior2025\IncludeDB.php:9
Stack trace:
#0 D:\wwwroot\qzsenior2025\confirm.php(2): require()
#1 {main}
  thrown in <b>D:\wwwroot\qzsenior2025\IncludeDB.php</b> on line <b>9</b><br />