【文章推荐】Mybatis：Mapper method attempted to return null from a method with a primitive return type (int)

原文：Mybatis：Mapper method attempted to return null from a method with a primitive return type (int)

关键词 SpringMVC SSM Mybatis eclipse 报错内容 Mybatis：Mapper method attempted to return null from a method with a primitive return type int 原因 Mapper.xml的标签用错了。。。低级错误，轻喷。。。比如本来应该：插入语句用 lt insert gt lt ins ...

2021-04-09 16:40 1 319 推荐指数：

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使用mybatis报错：Mapper method 'com.xin.dao.BlogMapper.addBlog attempted to return null from a method with a primitive return type (int).

错误原因分析本次报错的原因在于sql语句未查询到数据，返回为null。而我们定义的dao层方法是返回为int，就会出现如下这样的提示：return null from a method with a primitive return type (int).（试图从具有原始 ...

delete attempted to return null from a method with a primitive return type (int)

今天被自己给蠢死了今天在代码中遇到这个错误，百度翻译一下：映射方法，从一org.system.mapper.child.chmorganizationexaminationmapper.delete返回零作为一个原始的方法的返回类型（int）。最后发现 ...

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

解决方法：方法1：将boolean、int、long等基本数据类型改为封装数据类型，boolean封装数据类型为Boolean、int封装数据类型为Integer，根据个人项目逻辑，对返回值进行判断即可。方法2：使用MySQL种的IFNULL函数，IFNULL函数是MySQL控制流函数 ...

mybatis中报错attempted to return null from a method with a primitive return type (int).

查询总数没有值时报错这个时候需要讲dao层接口的返回数据类型改成Integer就好了 ...

Mapper method 'com.xxxx.other.dao.MyDao.getNo attempted to return null from a method with a primitive return type (int)

使用myBatis调用存储过程的返回值，提示错误信息: org.apache.ibatis.binding.BindingException: Mapper method 'com.xxxx.other.dao.MyDao.getNo attempted to return null from ...

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

<select id="getMaxHitEventId" parameterType="string" resultType="int"> select max(app_hitEventID） from hits_tab_app where ...

mybatis查询时使用基本数据类型接收报错-attempted to return null from a method with a primitive return type (int)

一、问题由来自己在查看日志时发现日志中打印了一行错误信息为: 组装已经放养的宠物数据异常--->Mapper method 'applets.user.mapper.xxxMapper.xxxmyRank attempted to return null from a method ...

Mapper method 'com.autoyol.mapper.trans.AccountLogMapper.getTotalIncomByMemNoLastest attempted to return null from a method with a primitive return

1.打开日志输出，降低日志级别。 2.调整mysql语句，不能使用order by limit之类的 ...

原文：Mybatis：Mapper method attempted to return null from a method with a primitive return type (int)

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