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同一模型执行多次更新
kyle
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通过model实例化query对象，是一个单列。进行多次更新时，后面的会覆盖前面的数据，所以显示是更新最后一条数据。

解决方法 ： 使用静态方法调用update方法进行更新操作

详情见文档：模型章的更新篇(务必仔细阅读)

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