NAME
    HTML::Table::FromDatabase - a subclass of HTML::Table to easily generate
    a HTML table from the result of a database query

SYNOPSIS
     my $sth = $dbh->prepare('select * from my_table')
        or die "Failed to prepare query - " . $dbh->errstr;
     $sth->execute() or die "Failed to execute query - " . $dbh->errstr;

     my $table = HTML::Table::FromDatabase->new( -sth => $sth );
     $table->print;

DESCRIPTION
    Subclasses HTML::Table, providing a quick and easy way to produce HTML
    tables from the result of a database query.

    I often find myself writing scripts which fetch data from a database and
    present it in a HTML table; often resulting in pointlessly repeated code
    to take the results and turn them into a table.

    HTML::Table itself helps here, but this module makes it even simpler.

    Column headings are taken from the field names returned by the query,
    unless overridden with the *-override_headers* or *-rename_headers*
    options.

    All options you pass to the constructor will be passed through to
    HTML::Table, so you can use all the usual HTML::Table features.

INTERFACE
    new Constructor method - consult HTML::Table's documentation, the only
        difference here is the addition of the following parameters:

        `-sth'
            (required) a DBI statement handle which has been executed and is
            ready to fetch data from

        `-callbacks'
            (optional) specifies callbacks/transformations which should be
            applied as the table is built up (see the CALLBACKS section
            below).

        `-html'
            (optional) can be *escape* or *strip* if you want HTML to be
            escaped (angle brackets replaced with < and >) or stripped
            out with HTML::Strip.

        `-override_headers'
            (optional) provide a list of names to be used as the column
            headings, instead of using the names of the columns returned by
            the SQL query. This should be an arrayref containing the heading
            names, and the number of heading names must match the number of
            columns returned by the query.

        `-rename_headers'
            (optional) provide a hashref of oldname => newname pairs to
            rename some or all of the column names returned by the query
            when generating the table headings.

        `-pad_empty_cells'
            (optional, default 1) pad empty cells with an ` ' to ensure
            they're rendered with borders appropriately. Many browsers
            "skip" empty cells, leading to missing borders around them,
            which many people consider broken. To stop this, by default
            empty cells receive a non-breaking space as their content. If
            you don't want this behaviour, set this option to a false value.

CALLBACKS
  Per-cell callbacks
    You can pass an arrayref of hashrefs describing callbacks to be
    performed as the table is built up, which can modify the data before the
    table is produced.

    Each callback receives the value and, as of 0.04, the $row hashref
    (normally you will only want to look at the value, but occasionally I've
    found cases where the callback needs to see the rest of the row, for
    various reasons).

    This can be very useful; one example use-case would be turning the
    values in a column which contains URLs into clickable links:

     my $table = HTML::Table::FromDatabase->new(
        -sth => $sth,
        -callbacks => [
            {
                column => 'url',
                transform => sub { $_ = shift; qq[<a href="$_">$_</a>]; },
            },
        ],
     );

    You can match against the column name using a key named `column' in the
    hashref (as illustrated above) or against the actual value using a key
    named `value'.

    You can pass a straight scalar to compare against, a regex (using qr//),
    or a coderef which will be executed to determine if it matches.

    You pass a coderef to be called for matching cells via the `transform'
    key. You can use `callback' instead if you want your coderef to be
    called but its return value to be discarded (i.e. you don't intend to
    modify the value, but do something else).

    Another example - displaying all numbers to two decimal points:

     my $table = HTML::Table::FromDatabase->new(
        -sth => $sth,
        -callbacks => [
            {
                value => qr/^\d+$/,
                transform => sub { return sprintf '%.2f', shift },
            },
        ],
     );

    It is hoped that this facility will allow the easiness of quickly
    creating a table to still be retained, even when you need to do things
    with the data rather than just displaying it exactly as it comes out of
    the database.

  Per-row callbacks
    You can also supply callbacks which operate on an entire row at a time
    with the `-row_callbacks' option, which simply takes an arrayref of
    coderefs, each of which will be called in turn, will receive the row
    hashref as its first parameter, and can modify the row in whatever way
    is desired.

      my $table = HTML::Table::FromDatabase->new(
          -sth => $sth,
          -row_callbacks => [
              sub {
                my $row = shift;
                # Do things with $row here
              },
          ],
      ):

    If a row callback sets the `$row' hashref to undef, that row will be
    skipped.

    A more in-depth, if somewhat contrived, example:

      my $table = HTML::Table::FromDatabase->new(
          -sth => $sth,
          -row_callbacks => [
              sub {
                my $row = shift;
                if ($row->{name} eq 'Bob') {
                    # Hide this row
                    $row = undef;
                } elsif ($row->{name} eq 'John') {
                    # John likes to be called Jean these days:
                    $row->{name} = 'Jean';
                }
              },
          ],
      );

DEPENDENCIES
    HTML::Table, obviously :)

    HTML::Strip is required if you use the `-html => 'strip'' option.

    HTML::Entities is required if you use the `-html => 'encode'' option.

AUTHOR
    David Precious, <davidp@preshweb.co.uk>

    Feel free to contact me if you have any comments, suggestions or bugs to
    report.

THANKS
    Thanks to Ireneusz Pluta for reporting bug with -override_headers /
    -rename_headers option and supplying patch in RT ticket #50164.

COPYRIGHT AND LICENSE
    Copyright (C) 2008-2011 by David Precious

    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself, either Perl version 5.8.7 or, at
    your option, any later version of Perl 5 you may have available.