com.mtconnect.exception.DAOException: java.sql.SQLException: number of allocated descriptors exceede
由于声明的statement没有关闭，形成的。方法 若是出现了这个问题，必定要正确的关闭statement。 若是不肯定那就在每一个statement执行完毕以后，执行close方法。来进行排查。
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