9.3 散列的数组:

9.3 散列的数组:

Vsftp:/root/perl/6# cat a3.pl 
@AoH = (
{
husband => "barney",
wife => "betty",
son => "bamm bamm",
},
{
husband => "george",
wife => "jane",
son => "elroy",
},
{
husband => "homer",
wife => "marge",
son => "bart",
},
);

print @AoH;
print "\n";
print $AoH[0]->{son};
print "\n";
Vsftp:/root/perl/6# perl a3.pl 
HASH(0x1302d48)HASH(0x131f6d8)HASH(0x131f750)
bamm bamm

要向数组中增加另外一个散列，你可以简单地说：
Vsftp:/root/perl/6# cat a3.pl 
@AoH = (
{
husband => "barney",
wife => "betty",
son => "bamm bamm",
},
{
husband => "george",
wife => "jane",
son => "elroy",
},
{
husband => "homer",
wife => "marge",
son => "bart",
},
);

print @AoH;
print "\n";
print $AoH[0]->{son};
print "\n";
push @AoH, { husband => "fred", wife => "wilma", daughter => "pebbles" };
print @AoH;
print "\n";
Vsftp:/root/perl/6# perl a3.pl 
HASH(0x1dbdd48)HASH(0x1de5590)HASH(0x1de5608)
bamm bamm
HASH(0x1dbdd48)HASH(0x1de5590)HASH(0x1de5608)HASH(0x1dda408)



9.3.2 生成散列的数组:

Vsftp:/root/perl/6# cat a4.pl 
open (A,bb);
while (<A>){
 my @arr=();
 my  @arr= split(/\s+/,$_);
 print "\@arr is @arr\n";

 ##定义散列引用
 my $rec={};
 for $field (@arr){
    ($key, $value) = split /=/, $field;
     $rec->{$key} = $value;
     }
  push @AoH, $rec;
  print @AoH;
  print "\n";
 
};


print "1111111111111\n";
print @AoH;
print "\n";
print %{$AoH[0]};
print "\n";
print %{$AoH[1]};
print "\n";


Vsftp:/root/perl/6# cat bb
husband=fred friend=barney
aa=bb    cc=dd

Vsftp:/root/perl/6# perl a4.pl 
@arr is husband=fred friend=barney
HASH(0x25bed48)
@arr is aa=bb cc=dd
HASH(0x25bed48)HASH(0x25beb98)
1111111111111
HASH(0x25bed48)HASH(0x25beb98)
friendbarneyhusbandfred
ccddaabb


/****************************************

Vsftp:/root/perl/6# cat a10.pl 
open (A,cc);
while (<A>){
     ##创建hash引用
     $rec={};
     my @arr=split(/\s+/,$_);
     foreach (@arr){
     ($key, $value) = split /=/, $_;
     $rec->{$key} = $value; 
    };
    };
 %h= %{$rec};
 print $h{friend};
 print "\n";
 print $h{husband};
 print "\n";
  



Vsftp:/root/perl/6# cat cc
husband=fred friend=barney
Vsftp:/root/perl/6# perl a10.pl 
barney
fred


Vsftp:/root/perl/6# cat a11.pl 
use Data::Dumper;
open (A,cc);
while (<A>){
     ##创建hash引用
     $rec={};
     my @arr=split(/\s+/,$_);
     foreach (@arr){
     ($key, $value) = split /=/, $_;
     $rec->{$key} = $value; 
    };
   push @AoH ,$rec;
    };
  
print Dumper(@AoH);
print "\n";
print $AoH[0]->{husband};
print "\n";



Vsftp:/root/perl/6# perl a11.pl 
$VAR1 = {
          'friend' => 'barney',
          'husband' => 'fred'
        };

fred


9.3.3 访问和打印散列的数组 

你可以用下面的方法设置一个特定散列的数值/键值对

Vsftp:/root/perl/6# cat a11.pl 
use Data::Dumper;
open (A,cc);
while (<A>){
     ##创建hash引用
     $rec={};
     my @arr=split(/\s+/,$_);
     foreach (@arr){
     ($key, $value) = split /=/, $_;
     $rec->{$key} = $value; 
    };
   push @AoH ,$rec;
    };
  
print Dumper(@AoH);
print "\n";
print $AoH[0]->{husband};
print "\n";
$AoH[0]{pet} = "dino";
print Dumper(@AoH);



Vsftp:/root/perl/6# perl a11.pl 
$VAR1 = {
          'friend' => 'barney',
          'husband' => 'fred'
        };

fred
$VAR1 = {
          'pet' => 'dino',
          'friend' => 'barney',
          'husband' => 'fred'
        };


你可以用下面的方法打印所有的数据:

##遍历每个引用
for $href (@AoH){
         ##%{$href} 解引用,打印键和值
         for $key (keys %{$href}){
           print "$key---$href->{$key}";
           print "\n";
           }
};