one result (or null) to be returned by selectOne(), but found
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今天使用ssm框架写项目,其中一个功能是用户注册成功的同时给用户添加一个账户.账户表的外键是用户表的id,应该是唯一的,所以通过用户id查询得到的是一个账户信息.但是由于出现错误,所以给账户添加了两个相同的用户id.所以通过用户id查询的时候就出现了这个错误.
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这个错误是因为dao层查询结果应该是一个,结果实际查询出的是多个结果,应该用list接受,所以出现了错误.
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