hibernate一对多单向关联保存时报 ‘xxxx’ doesn't have a default value
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解决方法：数据库把报错的字段设为允许为空
原因：
hibernate会先插入多的那方，这时候因为一的那方还没保存，所以插入的语句不包括级联的外键字段，等到一的那方保存完之后，hibernate会再执行update语句更新外键字段
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