com.mtconnect.exception.DAOException: java.sql.SQLException: number of allocated descriptors exceede
由於聲明的statement沒有關閉，形成的。方法 若是出現了這個問題，必定要正確的關閉statement。 若是不肯定那就在每一個statement執行完畢以後，執行close方法。來進行排查。
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