Cause: java.sql.SQLIntegrityConstraintViolationException: Duplicate entry '5' for key 'user_student.PRIMARY'

这个错误信息是由于违反了数据库的唯一约束条件导致的。具体来说，当插入或添加数据时，具有唯一约束条件的列值重复了，就会报出这个错误。\[2\]在你提供的例子中，错误信息是"Duplicate entry '5' for key 'user_student.PRIMARY'"，意味着在'user_student'表的'PRIMARY'键中已经存在了值为5的重复记录。\[3\]这个错误通常是由于插入重复的主键值或唯一索引值导致的。要解决这个问题，你可以检查你的数据插入操作，确保插入的值在相应的列中是唯一的。
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