最简单的原因可能是数据库外键字段选择了不能为空，
改为允许为空就行了。
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org.springframework.dao.DataIntegrityViolationException
报错 org.springframework.dao.DataIntegrityViolationException: Error attempting to get column
【异常】Caused by: java.lang.ClassNotFoundException: org.springframework.dao.DataIntegrityViolationException
【hibernate】报错：org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; nested exception is org.hibernate.exception.DataException: could not execute statement
org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.
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