attempted to return null from a method with a primitive return type (long).

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写了一个sql:select sum(game_score) from pt_game_recor

报错attempted to return null from a method with a primitive return type (long).

我的返回值类型为long，但是查询出来的结果有空值，所以会出现如上的异常，以下为解决办法：

将sql改为select IFNULL(sum(game_score),0) from pt_game_record