com.mtconnect.exception.DAOException: java.sql.SQLException: number of allocated descriptors exceede
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因为声明的statement没有关闭，造成的。
如果出现了这个问题，一定要正确的关闭statement。
如果不确定那就在每个statement执行完毕之后，执行close方法。来进行排查。
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