在scala中对csv的强类型访问? [英] Strongly typed access to csv in scala?

问题描述

我想以强类型的方式访问 scala 中的 csv 文件.例如，当我读取 csv 的每一行时，它会被自动解析并表示为具有适当类型的元组.我可以在传递给解析器的某种模式中预先指定类型.是否有任何图书馆可以做到这一点?如果没有，我怎么能自己实现这个功能?

I would like to access csv files in scala in a strongly typed manner. For example, as I read each line of the csv, it is automatically parsed and represented as a tuple with the appropriate types. I could specify the types beforehand in some sort of schema that is passed to the parser. Are there any libraries that exist for doing this? If not, how could I go about implementing this functionality on my own?

推荐答案

出现product-collections非常适合您的要求:

product-collections appears to be a good fit for your requirements:

scala> val data = CsvParser[String,Int,Double].parseFile("sample.csv")
data: com.github.marklister.collections.immutable.CollSeq3[String,Int,Double] = 
CollSeq((Jan,10,22.33),
        (Feb,20,44.2),
        (Mar,25,55.1))

product-collections 使用 opencsv 在后台.

product-collections uses opencsv under the hood.

一个 CollSeq3 是一个 IndexedSeq[Product3[T1,T2,T3]] 也是一个 Product3[Seq[T1],Seq[T2]，Seq[T3]] 加一点糖.我是 product-collections 的作者.

A CollSeq3 is an IndexedSeq[Product3[T1,T2,T3]] and also a Product3[Seq[T1],Seq[T2],Seq[T3]] with a little sugar. I am the author of product-collections.

这里是 scaladoc io 页面的链接

Product3 本质上是元组 3 的元组.

Product3 is essentially a tuple of arity 3.

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