NAME

DBIx::CGI - Easy to Use DBI interface for CGI scripts

SYNOPSIS

use CGI;
my $cgi = new CGI;
use DBIx::CGI;
my $dbi_interface = new DBIx::CGI ($cgi, qw(Pg template1));

$dbi_interface -> insert ('transaction',
                 id => serial ('transaction', 'transactionid'),
                 time => \$dbi_interface -> now);

DESCRIPTION

DBIx::CGI is an easy to use DBI interface for CGI scripts. Currently only the Pg, mSQL and mysql drivers are supported.

CREATING A NEW DBI INTERFACE OBJECT

$dbi_interface = new DBIx::CGI ($cgi qw(Pg template1));

The required parameters are a CGI object, the database driver and the database name. Additional parameters are the database user.

ERROR HANDLING

sub fatal {
  my ($statement, $err, $msg) = @_;
  die ("$0: Statement \"$statement\" failed (ERRNO: $err, ERRMSG: $msg)\n");
}
$dbi_interface -> install_handler (\&fatal);

If any of the DBI methods fails, either die will be invoked or an error handler installed with install_handler will be called.

METHODS

process statement

$sth = $dbi_interface -> process ("SELECT * FROM foo");
print "Table foo contains ", $sth -> rows, " rows.\n";

Processes statement by just combining the prepare and execute steps of the DBI. Returns statement handle in case of success.

insert table column value [column value] ...

$sth = $dbi_interface -> insert ('bar', drink => 'Caipirinha');

Inserts the given column/value pairs into table. Determines from the SQL data type which values has to been quoted. Just pass a reference to the value to protect values with SQL functions from quoting.

update table conditions column value [column value] ...

$dbi_interface -> update ('components', "table='ram'", price => 100);

Updates any row of table which fulfill the conditions by inserting the given column/value pairs. .

rows table [conditions]

$components = $dbi_interface -> rows ('components');
$components_needed = $dbi_interface -> rows ('components', 'stock = 0');

Returns the number of rows within table satisfying conditions if any.

serial table sequence

Returns a serial number for table by querying the next value from sequence. Depending on the DBMS one of the parameters is ignored. This is sequence for mSQL resp. table for PostgreSQL. mysql doesn't support sequences, but the AUTO_INCREMENT keyword for fields. In this case this method returns 0 and mysql generates a serial number for this field.

fill sth hashref [flag column ...]

Fetches the next table row from the result stored into sth and records the value of each field in hashref. If flag is set, only the fields specified by the column arguments are considered, otherwise the fields specified by the column arguments are omitted.

view table

foreach my $table (sort $dbi_interface -> tables)
  {
  print $cgi -> h2 ('Contents of ', $cgi -> code ($table));
  print $dbi_interface -> view ($table);
  }

Produces HTML code for a table displaying the contents of the database table table.

TIME VALUES

now

$dbi_interface -> insert ('transaction',
                 id => serial ('transaction', 'transactionid'),
                 time => \$dbi_interface -> now);

Returns representation for the current time. Uses special values of the DBMS if possible.

MONETARY VALUES

money2num money

Converts the monetary value money to a numeric one.

AUTHOR

Stefan Hornburg, racke@linuxia.de

SEE ALSO

perl(1).