How do we get many records from such a contruction?

By repeating the assignment with different $record. 

my %byname;
for my $record (
   {
      NAME => "Jason",
      EMPNO => "132",
   },
   {
      NAME => "Orange",
      EMPNO => "133",
   },
) {
   $byname{ $record->{NAME} } = $record;
}

print(Dumper(\%byname));

[download]

In reality, your record source would be a database or LDAP or something rather than a hardcoded list.

Update:

Oh wait, are you asking how to access the records?

To access one record: 

my $record = $byname{$name};

[download]

To access each record: 

for my $name ( keys(%byname) ) {
    my $record = $byname{$name};
    ...
}

[download]

To access each record, sorted by id: 

for my $name (
    sort { $byname{$a}{EMPNO} <=> $byname{$b}{EMPNO} }
        keys(%byname)
) {
    my $record = $byname{$name};
    ...
}

[download]

To check if an employee exists, 

if (exists($byname{$name})) {
    # yes
} else {
    # no
}

[download]

In reply to Re: Example in Cookbook of hash of hash by ikegami
in thread Example in Cookbook of hash of hash by theantler

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