修改数据库中的内容报错:PropertyAccessException:Null value was assinged to a property of primitive type setter of

错误原因:totalTime的类型为int,数据库中为NULL,int 类型不能赋值为NULL,只能为0,所以报此异常。
解决方案:将totalTime的类型改为Integer,或者初始化为0
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