Re: Inserting a image into a database

G'day folk,

Andrew's given you some great starting points, but I'd like to just make a few
stylistic corrections to the Perl code. So building on what Andrew wrote:

#!/usr/bin/perl -w
use strict;
use DBI ;
use DBD::Pg qw(:pg_types); # Required for us to use the *bytea* column
use Fatal qw(open close); # Throw exception if we fail to open or close

# You'll need to change these
my $dbname = "name of your database";
my $username = "your database username, or empty";
my $password = "your database password, or empty";
my $id = "id of image for insert";

my $passed_file = $ARGV[0]; # Assuming it was passed in on the command line

# Read in the contents of the raw file
my $contents = "";
open (my $in_fh,"<",$passed_file); # 3 arg open and scalar filehandles

# Tell Perl not to translate newline characters
binmode($in_fh);

while ( read $in_fh, my $buf, 16384) {$contents .= $buf ;}
close $in_fh ;

# sanity check writing file back to system (to make sure you get the same
# one) Not essential, but a good test.
my $file_copy = $passed_file.".FILECOPY";
open (my $out_fh,">", $file_copy);
binmode($out_fh);
print {$out_fh} $contents; # curlies not needed, but visually helpful
close $out_fh;

# Connect to the database
my $dbh = DBI->connect("dbi:Pg:dbname=$dbname", $username, $password,
{
AutoCommit => 0,
RaiseError => 1
}
);

# now the insert (you'll have to update the $id value above)
# INSERT THE Binary DATA into the table.
my $insert = $dbh->prepare("
INSERT INTO binary_image ( image_id , contents )
VALUES ( ? , ? )
"); # Raise Error will check for failures

# bind_param the index starts from 1 (PG_BYTEA as per the documentation)
$insert->bind_param(2, undef, { pg_type => PG_BYTEA });
$insert->execute($id , $contents);

# And it's inserted!
# now the select

# Now let's get the blob and write it to a file ...
my $select = $dbh->prepare("
SELECT contents from binary_image WHERE image_id > = ?
");

my $content = $select->fetchrow_hashref->{'contents'} ;

# Now lets write it
my $new_file = $passed_file.".DBCOPY";
open (my $new_fh,">", $new_file);
binmode($new_fh);
print {$new_fh} $content; # curlies not needed, but visually helpful
close $new_fh;

--
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