程序操作Oracle數據庫時，出現“ORA-01858: a non-numeric character was found where a numeric was expected”錯誤。
原因是語句中包含“lurudate = TO_DATE('197001ull','yyyymmddhh24mi')”，里面的時間格式不正確。
以后寫程序時一定要加強對數據合法性的校驗。
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