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Using fixed-length records is also a case of using an existing function set that you already know about The pack and unpack functions, which you saw in the previous chapter, can be used to create fixed-length records that can be written to a file Because the bytestring generated by pack is (within reason) architecture independent, using pack and unpack can be a reliable method for storing and exchanging information across platforms

Answer (for Objective 72): A and D are correct B is incorrect because -D is used with the java command to set a system property C is incorrect because -da is used to disable assertions E is incorrect because the deprecationrelated option is -deprecation Note: You don t need to memorize all the java and javac command-line options, but -d, -D, and assertion options WILL be on the exam

Following are three simple scripts: one to add data to a task list, one to report from it, and one to update the information in a task list The first is relatively simple We will compose the information from that supplied on the command line and append a packed bytestring to the end of the file

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my ($taskfile) = "tasksdb"; my ($taskformat) = "A40LL"; my ($sec,$min,$hour,$mday,$mon,$year) = (localtime(time))[05]; $mon++; $year += 1900; die "Usage: $0 title required-date\n" if (@ARGV<2); ($mday,$mon,$year) = split '/',$ARGV[-1]; $reqdate = ($year*10000)+($mon*100)+$mday; open(D,">>$taskfile") || die "Couldn't open the task file, $!\n"; print D pack($taskformat,$ARGV[0],$reqdate,0); close(D);

The only important note is that we convert the date into a numerical format The reason for this, which will be more important in the next script, is that the numerical version can be more easily sorted via the standard Perl functions Reporting from the database is almost as simple Once again we employ the unpack function to extract the individual records in turn:

25 Given that "it, IT" is the locale code for Italy and that "pt, BR" is the locale code for Brazil, and given:

use Getopt::Std; my my my my $taskfile = "tasksdb"; $taskformat = "A40LL"; $tasklength = length(pack($taskformat,)); $ref=0;

getopts('drc'); open(D,"<$taskfile") || die "Couldn't open the task file, $!\n"; while(read(D,$_,$tasklength)) { ($title,$reqdate,$compdate) = unpack($taskformat,$_); $lref{$ref} = $title;

13:

51 52 53 54 55 56 57 Date d = new Date(); DateFormat df = DateFormatgetDateInstance(DateFormatFULL); Locale[] la = {new Locale("it", "IT"), new Locale("pt", "BR")}; for(Locale l: la) { dfsetLocale(l); Systemoutprintln(dfformat(d)); }

$lref{$ref} = "$reqdate" if ($opt_r); $lref{$ref} = "$compdate" if ($opt_c); $ltitle{$ref} = $title; $lreqdate{$ref} = $reqdate; $lcompdate{$ref} = $compdate; $ref++; } close(D); PROGRAMMING WITH PERL printf("%-40s %-10s %-10s\n","Title","Req Date","Comp Date");

foreach $key (sort_values(\%lref)) { $lreqdate{$key} =~ s#()()()#$3/$2/$1#; if ($lcompdate{$key}>0) { next if ($opt_d); $lcompdate{$key} =~ s#()()()#$3/$2/$1#; } else { $lcompdate{$key}=""; } printf("%-40s %10s %10s\n", $ltitle{$key},$lreqdate{$key},$lcompdate{$key}); } sub sort_values { my $lref = shift; if ($opt_r || $opt_c) { sort {$lref{$a} <=> $lref{$b}} keys %$lref; } else { sort {$lref{$a} cmp $lref{$b}} keys %$lref; } }

The final script is more complicated Updating information in either a delimited or fixed-length database requires that you know the location of the data that you want to update With a delimited database, the data can potentially be of any length, and so you need to copy the existing information from the current database into a new file, substituting the updated information in the new file before continuing the copy process It s not possible to insert data into the file you cannot move data within a physical file without moving the information somewhere else first You could do it in memory, but for large databases, this wouldn t be practical Instead, the better solution is to use external files for the process With a fixed-length database, the process is slightly easier The length of each record in the database is the same, so updating a record is as easy as overwriting the updated and packed record in the same physical location within the file To do this you use the seek and tell functions This is a cyclical process in which you read in each record until you find the one you want, remembering the location of the start of the record in each case Then, once the information has been updated, you go back to the start of the record and rewrite the packed record Here s the script that updates our earlier task file entries:

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