Comments (4)
没太看懂你的问题,要不你贴一段代码,注释上你期望的结果和实际结果
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eg: id user_name 字段的定义在最上面
1 nan
select user_name from a where id = 1;
我希望得到的 string(nan)
但是我最后得到的是float64(NaN)
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了解了,这个是因为 strconv这里做了特殊处理。
我看你里面有会先将string转为[110 97 110]uint8,然后再转出float64(NaN)。想问下,当初你们这样设计是出于什么考虑呢
并没有将string转成[]uint8,而是go-sql-driver/mysql这个驱动返回的数据类型就是[]uint8,这里只是类型推断,不是类型转换。由于历史原因,驱动的不同版本对同一个mysql的数据类型可能返回不同的值,在某些版本bigint会使用[]byte来返回,因此这里需要类型推断到[]uint8(等价于[]byte),然后尝试进行类型转换。
目前看起来你面临的问题暂时是无法解决的,如果驱动不能保证所有数值类型从rows里读出来都是数值类型,那这里就得做这么一层转换。
解决方案是,你可以换成Scan方法,定义一个结构体,这样在进行类型转换时会按照你期望的类型来转换
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If no more questions, I will close the issue
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Related Issues (20)
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