db-recno.t

介绍：MySQL是比较出名的数据库软件

    $h[1] = "def" ;
    $h[2] = "ghi" ;
    $h[3] = "jkl" ;
    ok(68, $FA ? $#h == 3 : $self->length() == 4) ;
    undef $self ;
    untie @h ;
    my $x = docat($Dfile) ;
    ok(69, $x eq "abc\ndef\nghi\njkl\n") ;

    # $# sets array to same length
    ok(70, $self = tie @h, 'DB_File', $Dfile, O_RDWR, 0640, $DB_RECNO ) ;
    if ($FA)
      { $#h = 3 }
    else 
      { $self->STORESIZE(4) }
    ok(71, $FA ? $#h == 3 : $self->length() == 4) ;
    undef $self ;
    untie @h ;
    $x = docat($Dfile) ;
    ok(72, $x eq "abc\ndef\nghi\njkl\n") ;

    # $# sets array to bigger
    ok(73, $self = tie @h, 'DB_File', $Dfile, O_RDWR, 0640, $DB_RECNO ) ;
    if ($FA)
      { $#h = 6 }
    else 
      { $self->STORESIZE(7) }
    ok(74, $FA ? $#h == 6 : $self->length() == 7) ;
    undef $self ;
    untie @h ;
    $x = docat($Dfile) ;
    ok(75, $x eq "abc\ndef\nghi\njkl\n\n\n\n") ;

    # $# sets array smaller
    ok(76, $self = tie @h, 'DB_File', $Dfile, O_RDWR, 0640, $DB_RECNO ) ;
    if ($FA)
      { $#h = 2 }
    else 
      { $self->STORESIZE(3) }
    ok(77, $FA ? $#h == 2 : $self->length() == 3) ;
    undef $self ;
    untie @h ;
    $x = docat($Dfile) ;
    ok(78, $x eq "abc\ndef\nghi\n") ;

    unlink $Dfile;


}

{
   # DBM Filter tests
   use warnings ;
   use strict ;
   my (@h, $db) ;
   my ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   unlink $Dfile;

   sub checkOutput
   {
       my($fk, $sk, $fv, $sv) = @_ ;
       return
           $fetch_key eq $fk && $store_key eq $sk && 
	   $fetch_value eq $fv && $store_value eq $sv &&
	   $_ eq 'original' ;
   }
   
   ok(79, $db = tie(@h, 'DB_File', $Dfile, O_RDWR|O_CREAT, 0640, $DB_RECNO ) );

   $db->filter_fetch_key   (sub { $fetch_key = $_ }) ;
   $db->filter_store_key   (sub { $store_key = $_ }) ;
   $db->filter_fetch_value (sub { $fetch_value = $_}) ;
   $db->filter_store_value (sub { $store_value = $_ }) ;

   $_ = "original" ;

   $h[0] = "joe" ;
   #                   fk   sk     fv   sv
   ok(80, checkOutput( "", 0, "", "joe")) ;

   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   ok(81, $h[0] eq "joe");
   #                   fk  sk  fv    sv
   ok(82, checkOutput( "", 0, "joe", "")) ;

   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   ok(83, $db->FIRSTKEY() == 0) ;
   #                    fk     sk  fv  sv
   ok(84, checkOutput( 0, "", "", "")) ;

   # replace the filters, but remember the previous set
   my ($old_fk) = $db->filter_fetch_key   
   			(sub { ++ $_ ; $fetch_key = $_ }) ;
   my ($old_sk) = $db->filter_store_key   
   			(sub { $_ *= 2 ; $store_key = $_ }) ;
   my ($old_fv) = $db->filter_fetch_value 
   			(sub { $_ = "[$_]"; $fetch_value = $_ }) ;
   my ($old_sv) = $db->filter_store_value 
   			(sub { s/o/x/g; $store_value = $_ }) ;
   
   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   $h[1] = "Joe" ;
   #                   fk   sk     fv    sv
   ok(85, checkOutput( "", 2, "", "Jxe")) ;

   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   ok(86, $h[1] eq "[Jxe]");
   #                   fk   sk     fv    sv
   ok(87, checkOutput( "", 2, "[Jxe]", "")) ;

   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   ok(88, $db->FIRSTKEY() == 1) ;
   #                   fk   sk     fv    sv
   ok(89, checkOutput( 1, "", "", "")) ;
   
   # put the original filters back
   $db->filter_fetch_key   ($old_fk);
   $db->filter_store_key   ($old_sk);
   $db->filter_fetch_value ($old_fv);
   $db->filter_store_value ($old_sv);

   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   $h[0] = "joe" ;
   ok(90, checkOutput( "", 0, "", "joe")) ;

   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   ok(91, $h[0] eq "joe");
   ok(92, checkOutput( "", 0, "joe", "")) ;

   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   ok(93, $db->FIRSTKEY() == 0) ;
   ok(94, checkOutput( 0, "", "", "")) ;

   # delete the filters
   $db->filter_fetch_key   (undef);
   $db->filter_store_key   (undef);
   $db->filter_fetch_value (undef);
   $db->filter_store_value (undef);

   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   $h[0] = "joe" ;
   ok(95, checkOutput( "", "", "", "")) ;

   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   ok(96, $h[0] eq "joe");
   ok(97, checkOutput( "", "", "", "")) ;

   ($fetch_key, $store_key, $fetch_value, $store_value) = ("") x 4 ;
   ok(98, $db->FIRSTKEY() == 0) ;
   ok(99, checkOutput( "", "", "", "")) ;

   undef $db ;
   untie @h;
   unlink $Dfile;
}

{    
    # DBM Filter with a closure

    use warnings ;
    use strict ;
    my (@h, $db) ;

    unlink $Dfile;
    ok(100, $db = tie(@h, 'DB_File', $Dfile, O_RDWR|O_CREAT, 0640, $DB_RECNO ) );

    my %result = () ;

    sub Closure
    {
        my ($name) = @_ ;
	my $count = 0 ;
	my @kept = () ;

	return sub { ++$count ; 
		     push @kept, $_ ; 
		     $result{$name} = "$name - $count: [@kept]" ;
		   }
    }

    $db->filter_store_key(Closure("store key")) ;
    $db->filter_store_value(Closure("store value")) ;
    $db->filter_fetch_key(Closure("fetch key")) ;
    $db->filter_fetch_value(Closure("fetch value")) ;

    $_ = "original" ;

    $h[0] = "joe" ;
    ok(101, $result{"store key"} eq "store key - 1: [0]");
    ok(102, $result{"store value"} eq "store value - 1: [joe]");
    ok(103, ! defined $result{"fetch key"} );
    ok(104, ! defined $result{"fetch value"} );
    ok(105, $_ eq "original") ;

    ok(106, $db->FIRSTKEY() == 0 ) ;
    ok(107, $result{"store key"} eq "store key - 1: [0]");
    ok(108, $result{"store value"} eq "store value - 1: [joe]");
    ok(109, $result{"fetch key"} eq "fetch key - 1: [0]");
    ok(110, ! defined $result{"fetch value"} );
    ok(111, $_ eq "original") ;

    $h[7]  = "john" ;
    ok(112, $result{"store key"} eq "store key - 2: [0 7]");
    ok(113, $result{"store value"} eq "store value - 2: [joe john]");
    ok(114, $result{"fetch key"} eq "fetch key - 1: [0]");
    ok(115, ! defined $result{"fetch value"} );
    ok(116, $_ eq "original") ;

    ok(117, $h[0] eq "joe");
    ok(118, $result{"store key"} eq "store key - 3: [0 7 0]");
    ok(119, $result{"store value"} eq "store value - 2: [joe john]");
    ok(120, $result{"fetch key"} eq "fetch key - 1: [0]");
    ok(121, $result{"fetch value"} eq "fetch value - 1: [joe]");
    ok(122, $_ eq "original") ;

    undef $db ;
    untie @h;
    unlink $Dfile;
}		

{
   # DBM Filter recursion detection
   use warnings ;
   use strict ;
   my (@h, $db) ;
   unlink $Dfile;

   ok(123, $db = tie(@h, 'DB_File', $Dfile, O_RDWR|O_CREAT, 0640, $DB_RECNO ) );

   $db->filter_store_key (sub { $_ = $h[0] }) ;

   eval '$h[1] = 1234' ;
   ok(124, $@ =~ /^recursion detected in filter_store_key at/ );
   
   undef $db ;
   untie @h;
   unlink $Dfile;
}


{
   # Examples from the POD

  my $file = "xyzt" ;
  {
    my $redirect = new Redirect $file ;

    use warnings FATAL => qw(all);
    use strict ;
    use DB_File ;

    my $filename = "text" ;
    unlink $filename ;

    my @h ;
    my $x = tie @h, "DB_File", $filename, O_RDWR|O_CREAT, 0640, $DB_RECNO 
        or die "Cannot open file 'text': $!\n" ;

    # Add a few key/value pairs to the file
    $h[0] = "orange" ;
    $h[1] = "blue" ;
    $h[2] = "yellow" ;

    $FA ? push @h, "green", "black" 
        : $x->push("green", "black") ;

    my $elements = $FA ? scalar @h : $x->length ;
    print "The array contains $elements entries\n" ;

    my $last = $FA ? pop @h : $x->pop ;
    print "popped $last\n" ;

    $FA ? unshift @h, "white" 
        : $x->unshift("white") ;
    my $first = $FA ? shift @h : $x->shift ;
    print "shifted $first\n" ;

    # Check for existence of a key
    print "Element 1 Exists with value $h[1]\n" if $h[1] ;

    # use a negative index
    print "The last element is $h[-1]\n" ;
    print "The 2nd last element is $h[-2]\n" ;

    undef $x ;
    untie @h ;

    unlink $filename ;
  }  

  ok(125, docat_del($file) eq <<'EOM') ;
The array contains 5 entries
popped black
shifted white
Element 1 Exists with value blue
The last element is green
The 2nd last element is yellow
EOM

  my $save_output = "xyzt" ;
  {
    my $redirect = new Redirect $save_output ;

    use warnings FATAL => qw(all);
    use strict ;
    use vars qw(@h $H $file $i) ;
    use DB_File ;
    use Fcntl ;
    
    $file = "text" ;

    unlink $file ;

    $H = tie @h, "DB_File", $file, O_RDWR|O_CREAT, 0640, $DB_RECNO 
        or die "Cannot open file $file: $!\n" ;
    
    # first create a text file to play with
    $h[0] = "zero" ;
    $h[1] = "one" ;
    $h[2] = "two" ;
    $h[3] = "three" ;
    $h[4] = "four" ;

    
    # Print the records in order.
    #
    # The length method is needed here because evaluating a tied
    # array in a scalar context does not return the number of
    # elements in the array.  

    print "\nORIGINAL\n" ;
    foreach $i (0 .. $H->length - 1) {
        print "$i: $h[$i]\n" ;
    }

    # use the push & pop methods
    $a = $H->pop ;
    $H->push("last") ;
    print "\nThe last record was [$a]\n" ;

    # and the shift & unshift methods
    $a = $H->shift ;
    $H->unshift("first") ;
    print "The first record was [$a]\n" ;

    # Use the API to add a new record after record 2.
    $i = 2 ;
    $H->put($i, "Newbie", R_IAFTER) ;

    # and a new record before record 1.
    $i = 1 ;
    $H->put($i, "New One", R_IBEFORE) ;

    # delete record 3
    $H->del(3) ;

    # now print the records in reverse order
    print "\nREVERSE\n" ;
    for ($i = $H->length - 1 ; $i >= 0 ; -- $i)
      { print "$i: $h[$i]\n" }

    # same again, but use the API functions instead
    print "\nREVERSE again\n" ;
    my ($s, $k, $v)  = (0, 0, 0) ;
    for ($s = $H->seq($k, $v, R_LAST) ; 
             $s == 0 ; 
             $s = $H->seq($k, $v, R_PREV))
      { print "$k: $v\n" }

    undef $H ;
    untie @h ;    

    unlink $file ;
  }  

  ok(126, docat_del($save_output) eq <<'EOM') ;

ORIGINAL
0: zero
1: one
2: two
3: three
4: four

The last record was [four]
The first record was [zero]

REVERSE
5: last
4: three
3: Newbie
2: one
1: New One
0: first

REVERSE again
5: last
4: three
3: Newbie
2: one
1: New One
0: first
EOM
   
}

{
    # Bug ID 20001013.009
    #
    # test that $hash{KEY} = undef doesn't produce the warning
    #     Use of uninitialized value in null operation 
    use warnings ;
    use strict ;
    use DB_File ;

    unlink $Dfile;
    my @h ;
    my $a = "";
    local $SIG{__WARN__} = sub {$a = $_[0]} ;
    
    tie @h, 'DB_File', $Dfile, O_RDWR|O_CREAT, 0664, $DB_RECNO 
	or die "Can't open file: $!\n" ;
    $h[0] = undef;
    ok(127, $a eq "") ;
    untie @h ;
    unlink $Dfile;
}

{
    # test that %hash = () doesn't produce the warning
    #     Argument "" isn't numeric in entersub
    use warnings ;
    use strict ;
    use DB_File ;
    my $a = "";
    local $SIG{__WARN__} = sub {$a = $_[0]} ;

    unlink $Dfile;
    my @h ;
    
    tie @h, 'DB_File', $Dfile, O_RDWR|O_CREAT, 0664, $DB_RECNO 
	or die "Can't open file: $!\n" ;
    @h = (); ;
    ok(128, $a eq "") ;
    untie @h ;
    unlink $Dfile;
}

exit ;