在perl中使用TEXT :: CSV_XS模块将CSV文件转换为哈希结构 [英] To Convert CSV File to Hash Structure using TEXT::CSV_XS Module in perl

问题描述

下面是用于读取csv文件并将其转换为哈希的代码.密钥取决于用户所需的密钥列数.

I've below code which is used to read a csv file and convert to hash. The Keys are dependent on the number of key columns that user need.

use warnings;
use strict;

my %hash;     
my $KeyCols = 2;
while (<DATA>) {
    chomp;
    my @cols = split /,/, $_, $KeyCols+1;
    next unless @cols > $KeyCols;
    my $v = pop @cols;
    my $k = join '', @cols;
    $hash{$k} = $v;
}

我需要帮助来使用TEXT :: CSV_XS包实现相同的逻辑，以提高效率.请帮忙.

I need help in achieving the same logic using TEXT::CSV_XS package for efficiency. Please help.

推荐答案

使用Text :: CSV_XS的真正原因是为了确保正确性.它不会比您拥有的要快，但是它将在您失败的地方起作用.

The real reason for using Text::CSV_XS is for correctness. It's not going to be faster than what you have, but it will work where yours will fail.

use Text::CSV_XS qw( );

my $csv = Text::CSV_XS->new({
    auto_diag => 2,
    binary    => 1,
});

my %hash;
while ( my $row = $csv->getline(\*DATA) ) { 
   $hash{ $row->[0] . $row->[1] } = $row;
}

直接将字段串联在一起(不带分隔符)似乎很奇怪.

Concatenating the fields together directly (without a separator) seems really odd.

上面的方法使该值成为一个字段数组，而不是CSV.如果您想要CSV原始格式的CSV，则需要将它们重新编码为CSV.

The above makes the value an array of fields rather than CSV. If you want CSV as in the original, you will need to re-encode them into CSV.

my %hash;
while ( my $row = $csv->getline(\*DATA) ) { 
   my ($k1, $k2) = splice(@$row, 0, 2);
   $csv->combine(@$row);
   $hash{ $k1 . $k2 } = $csv->string();
}

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