明确的说明了此列默认不能为null，即int类型不能为null，导致查询失败无法赋值 默认值设置0或者清除无用的记录
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org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'null' to required type 'double' for property 'band'; nested exception is org.springframework.core.convert.Con
org.springframework.orm.hibernate3.LocalSessionFactoryBean的疑惑解决办法
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org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of com.*.Paper.totalTime
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nested exception is org.springframework.core.convert.ConverterNotFoundException
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