Error querying database. XXXXXXXXXXXXX, No database selected。
Error querying database. XXXXXXXXXXXXX, No database selected。
原因：查詢資料庫出錯，未連線資料庫。很大可能是URL配置出現問題。
解決方法： jdbc.url=jdbc:mysql://localhost:3306/username?serverTimezone=UTC
(username=資料庫的名字)
（?serverTimezone=UTC：配置時區獲取支援）
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