Null value was assigned to a property of primitive type setter of
在SSH项目的开发中遇到了下面的错误：
检查后发现数据库和映射文件中这个字段是允许为空的，为什么还要出错呢？原来是因为这个字段是int的，int是基本类型，即使设置成可以为空也不能取空值。
解决的办法就是给这个字段赋一个默认值。
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