select sum(deposit_amount)from tb_commission_ib_day mysql查询时报异常: attempted to return null from a method with a primitive return type 是因为查询时结果是 null, 需要给默认值 select IFNULL(sum(deposit_amount),0) from tb_commission_ib_day…
完整异常内容:org.springframework.jms.UncategorizedJmsException: Uncategorized exception occurred during JMS processing; nested exception is javax.jms.JMSException: Failed to create session factory; nested exception is ActiveMQConnectionTimedOutException[er…
问题描述:1.查询的size是1,但是里面的展示All elmemts are null . 因为之前没有遇到过这个问题,所以先百度了一下,发现有字段不对的,resultMap对不上的,我看了一下都是不相关的. 但是可以确定,查询数据填入到实体类出问题了. 问题原因:查询的类有问题,select b.* from A a left join B b on a.id=b.id where a.id='111' 类似与这样,要查B表的数据,确用A表left join B表,肯定有问题.如果有…
