Anatoly K. Lasareff

NAME

  DBIx::Repgen - simple report generator from DB-selected data

SYNOPSIS

 use Repgen;

 $r = DBIx::Repgen->new(
                 dbh => DBI->connect(...),
                 query => 'select ... from ...',

                 repdata => {
                             today => `date`
                            },

                 group => ['id'],
                 header => "========\n",
                 footer => sub {my ($r, $data) = @_; return "$data->{NAME} : $data->{VALUE}"},
                 item => ["%20s %s", qw/NAME VALUE/],

                 output => \$out;
                );

 $r->run(cust => 'tolik');
 print $out;

DESCRIPTION

íÏÄÕÌØ ÒÅÁÌÉÚÕÅÔ ËÌÁÓÓ DBIx::Repgen, ÐÒÅÄÓÔÁ×ÌÑÀÝÉÊ ÓÏÂÏÊ ÐÒÏÓÔÏÊ ÇÅÎÅÒÁÔÏÒ ÏÔÞÅÔÏ× ÐÏ ÄÁÎÎÙÍ, ÐÏÌÕÞÅÎÎÙÍ ÉÚ âä ÎÅËÏÔÏÒÙÍ select-ÏÐÅÒÁÔÏÒÏÍ. ïÔÞÅÔÙ ÍÏÇÕÔ ÓÏÄÅÒÖÁÔØ ÉÅÒÁÒÈÉÞÅÓËÕÀ ÇÒÕÐÐÉÒÏ×ËÕ ÐÏ ÚÎÁÞÅÎÉÑÍ ÐÏÌÅÊ, ÓÞÅÔÞÉËÉ ËÏÌÉÞÅÓÔ×Á ÚÁÐÉÓÅÊ É ÎÁÒÁÓÔÁÀÝÉÅ ÉÔÏÇÉ ÞÉÓÌÏ×ÙÈ ÐÏÌÅÊ ËÁË × ÐÒÅÄÅÌÁÈ ËÁÖÄÏÊ ÇÒÕÐÐÙ, ÔÁË É ÐÏ ×ÓÅÍÕ ÏÔÞÅÔÕ. æÏÒÍÁÔÉÒÏ×ÁÎÉÅ ËÁÖÄÏÊ ÞÁÓÔÉ ÏÔÞÅÔÁ ÍÏÖÅÔ ×ÙÐÏÌÎÑÔØÓÑ ÒÁÚÌÉÞÎÙÍÉ ÓÐÏÓÏÂÁÍÉ: ÚÁÄÁ×ÁÔØÓÑ ËÁË ÁÒÇÕÍÅÎÔÙ ÆÕÎËÃÉÉ sprintf, ÌÉÔÅÒÁÌØÎÏÊ ÓÔÒÏËÏÊ ÉÌÉ ÓÓÙÌËÏÊ ÎÁ ËÏÄ.

This package implements class DBIx::Repgen, which is simple report generator from data received from relational database by some select-statement. Such a report can contain hyerarchical grouping by field values, record counters and cumulative totals (sums) of numeric fields for each group as well as for whole report. Each rerort part formatting may be set as literal string, arguments of sprint function or be code reference.

new, class constructor

ëÏÎÓÔÒÕËÔÏÒ ËÌÁÓÓÁ ÉÍÅÅÔ ÏÄÉÎ ÁÒÇÕÍÅÎÔ, ÈÜÛ, ÒÁÚÌÉÞÎÙÅ ÜÌÅÍÅÎÔÙ ËÏÔÏÒÏÇÏ ÏÐÉÓÙ×ÁÀÔ ÏÔÞÅÔ.

Constructor has one argument, hashe. Elements of this hashe define the report and are descriebed below.

sth, dbh, query - data source setting

äÁÎÎÙÅ ÄÌÑ ÏÔÞÅÔÁ ÐÏÌÕÞÁÀÔÓÑ ×ÙÐÏÌÎÅÎÉÅÍ ÎÅËÏÔÏÒÏÇÏ select-ÏÐÅÒÁÔÏÒÁ × ÓÒÅÄÅ âä. ÷ÏÚÍÏÖÎÙ ÓÌÅÄÕÀÝÉÅ ÍÅÔÏÄÙ ÚÁÄÁÎÉÑ ÜÔÏÇÏ ÏÐÅÒÁÔÏÒÁ.

The report data are got by executing some select statement against relational database environment. There are following wais for defining this statement.

  1. ëÏÎÓÔÒÕËÔÏÒÕ ÐÅÒÅÄÁÅÔÓÑ × ÜÌÅÍÅÎÔÅ sth ÐÏÄÇÏÔÏ×ÌÅÎÎÙÊ (Ô.Å. ÐÏÌÕÞÅÎÎÙÊ ×ÙÐÏÌÎÅÎÉÅÍ $dbh-prepare>), ÎÏ ÅÝÅ ÎÅ ×ÙÐÏÌÎÅÎÎÙÊ ($sth-execute>) ÈÜÎÄÌ ÏÐÅÒÁÔÏÒÁ.

    Constructor receives in sth element prepared ($dbh-prepare>) but not executed ($sth-execute>) statement handle.

  2. ëÏÎÓÔÒÕËÔÏÒÕ ÐÅÒÅÄÁÀÔÓÑ ÈÜÎÄÌ ËÏÎÎÅËÃÉÉ Ë âä É ÐÏÌÎÙÊ ÔÅËÓÔ select-ÏÐÅÒÁÔÏÒÁ × ÐÁÒÁÍÅÔÒÁÈ dbh É query, ÓÏÏÔ×ÅÔÓÔ×ÅÎÎÏ. ðÒÉ ÜÔÏÍ ÎÅÏÂÈÏÄÉÍÙÅ prepare É execute ÂÕÄÅÔ ×ÙÐÏÌÎÅÎ ÐÒÉ ÚÁÐÕÓËÅ ÏÔÞÅÔÁ.

    Constructor receives database connection handle (from DBI-connect(...)>) and full text of select statement to be executed. Needed prepare and execute calls will perform by the report run.

  3. ëÏÎÓÔÒÕËÔÏÒÕ ÐÅÒÅÄÁÅÔÓÑ ÕÖÅ ÈÜÎÄÌ ×ÙÐÏÌÅÎÎÏÇÏ (execute) ÏÐÅÒÁÔÏÒÁ, ÎÁÐÒÉÍÅÒ ÐÒÉ ÄÉÎÁÍÉÞÅÓËÏÍ ÆÏÒÍÉÒÏ×ÁÎÉÉ sql-ÚÁÐÒÏÓÁ × ×ÙÚÙ×ÁÀÝÅÊ ÐÒÏÇÒÁÍÍÅ. ÷ ÜÔÏÍ ÓÌÕÞÁÅ ÐÒÉ ÚÁÐÕÓËÅ ÏÔÞÅÔÁ ÎÁ ×ÙÐÏÌÎÅÎÉÅ ÎÅ ÂÕÄÕÔ ×ÙÐÏÌÎÑÔØÓÑ prepare É execute. âÏÌÅÅ ÔÏÇÏ, ÄÌÑ ÐÏ×ÔÏÒÎÏÇÏ ÚÁÐÕÓËÁ ÏÔÞÅÔÁ ÎÅÏÂÈÏÄÉÍÏ (ÍÅÔÏÄÏÍ Set) ÕÓÔÁÎÏ×ÉÔØ ÄÌÑ ÏÔÞÅÔÁ ÎÏ×ÙÊ ÈÜÎÄÌ ÏÐÅÒÁÔÏÒÁ, ÄÁÎÎÙÅ ÉÚ ËÏÔÏÒÏÇÏ ÅÝÅ ÎÅ ÓÞÉÔÙ×ÁÌÉÓØ.

    ÷ ÜÔÏÍ ÓÌÕÞÁÅ ËÏÎÓÔÒÕËÔÏÒÕ ÏÔÞÅÔÁ ÐÅÒÅÄÁÅÔÓÑ ÐÁÒÁÍÅÔÒ noexec ÕÓÔÁÎÏ×ÌÅÎÎÙÊ × true.

    Constructor receives already prepared and executed statement handle. In this case noexec constructor parameter must be set to true. This feature may be useful by dynamic-made select queryes in calling programm. No prepare nor execute action will be performed by report run.

    Important note: you have to reset (by Set method) this statemeny handle before each next report run.

 Samples:

 $dbh = DBI->connect('dbi:Oracle:SID', 'user', 'password');
 $sth1 = $dbh->prepare('select name, value from tab where value between ? and ?');
 $rep1 = DBIx::Repgen->new(sth => $sth);

 $rep2 = DBIx::Repgen->new(dbh => $dbh, query => "select ... ");

 $sth3 = $dbh->prepare('select ...');
 $sth3->execute(@param);
 $rep3 = DBIx::Repgen->new(sth => $sth3, noexec => 1);

ðÒÉ ÉÓÐÏÌØÚÏ×ÁÎÉÉ ÐÅÒ×ÙÈ Ä×ÕÈ ÍÅÔÏÄÏ× ÏÔÞÅÔ ÍÏÖÅÔ ÂÙÔØ ÐÁÒÁÍÅÔÒÉÚÏ×ÁÎ, Ô.Å. sql-ÚÁÐÒÏÓ ÍÏÖÅÔ ÓÏÄÅÒÖÁÔØ placeholder-Ù, ÚÎÁÞÅÎÉÑ ÎÁ ÍÅÓÔÏ ËÏÔÏÒÙÈ ÂÕÄÕÔ ÐÏÄÓÔÁ×ÌÅÎÙ ÐÒÉ ×ÙÐÏÌÎÅÎÉÉ ÏÔÞÅÔÁ ÍÅÔÏÄÏÍ run. óÍ. ÄÁÌÅÅ Ï ÐÁÒÁÍÅÔÒÉÚÁÃÉÉ ÏÔÞÅÔÁ.

Using first two methods you may parametrize the report. This means sql-query can contain placeholders, for substituting values in report run time. See below about report parameters.

param - report parameters

ïÔÞÅÔ ÍÏÖÅÔ ÉÍÅÔØ ÎÁÂÏÒ ÉÍÅÎÏ×ÁÎÎÙÈ ÐÁÒÁÍÅÔÒÏ×. ïÐÉÓÁÎÉÅ ÐÁÒÁÍÅÔÒÁ ÓÏÓÔÏÉÔ × ÚÁÄÁÎÉÉ ÅÇÏ ÉÍÅÎÉ, ÎÏÍÅÒÁ (ÉÌÉ ÎÅÓËÏÌØËÉÈ ÎÏÍÅÒÏ×) placeholder-Ï×, ÎÁ ÍÅÓÔÏ ËÏÔÏÒÙÈ ÐÁÒÁÍÅÔÒ ÂÕÄÅÔ ÐÏÄÓÔÁ×ÌÑÔØÓÑ É ÎÅÏÂÑÚÁÔÅÌØÎÏÇÏ ÕÍÏÌÞÁÔÅÌØÎÏÇÏ ÚÎÁÞÅÎÉÑ. ïÐÉÓÁÎÉÅ ÐÁÒÁÍÅÔÒÏ× ÐÏÍÅÝÁÅÔÓÑ × ÈÜÛ, ÚÎÁÞÅÎÉÅ ÐÁÒÁÍÅÔÒÁ ËÏÎÓÔÒÕËÔÏÒÁ param. ëÌÀÞÉ ÜÔÏÇÏ ÈÜÛÁ - ÉÍÅÎÁ ÐÁÒÅÍÅÔÒÏ×, Á ÚÎÁÞÅÎÉÑ ÏÐÒÅÄÅÌÑÀÔ ÎÏÍÅÒÁ placeholder-Ï× É ÕÍÏÌÞÁÔÅÌØÎÙÅ ÚÎÁÞÅÎÉÑ.

The report may have set of named parameters. Single parameter definition contain its name, number (or some numbers) of placeholders in source select query and optional default value. Parametrs definition is a hash reference, value of constructor's param element. Keys in this hash are parameter names and values contain placeholder numbers and default values.

÷ ÐÒÏÓÔÅÊÛÅÍ ÓÌÕÞÁÅ ÏÐÉÓÁÎÉÅ ÐÁÒÁÍÅÔÒÁ ÍÏÖÅÔ ÂÙÔØ ÐÒÏÓÔÏ (zero based) ÎÏÍÅÒÏÍ ÔÏÇÏ ÅÄÉÎÓÔ×ÅÎÎÏÇÏ placeholder-Á, ÎÁ ÍÅÓÔÏ ËÏÔÏÒÏÇÏ ÐÏÄÓÔÁ×ÌÑÅÔÓÑ ÜÔÏÔ ÐÁÒÁÍÅÔÒ. ÷ ÂÏÌÅÅ ÓÌÏÖÎÙÈ ÓÌÕÞÁÑÈ ÏÐÉÓÁÎÉÅ ÐÁÒÁÍÅÔÒÁ Ñ×ÌÑÅÔÓÑ ÓÓÙÌËÏÊ ÎÁ ÈÜÛ. üÔÏÔ ÈÜÛ ÄÏÌÖÅÎ ÓÏÄÅÒÖÁÔØ ËÌÀÞ n ÓÏ ÚÎÁÞÅÎÉÅÍ ÃÅÌÏÇÏ ÞÉÓÌÁ ÉÌÉ ÓÐÉÓËÁ ÃÅÌÙÈ ÞÉÓÅÌ É ÍÏÖÅÔ ÓÏÄÅÒÖÁÔØ ËÌÀÞ dflt, ÓÏ ÚÎÁÞÅÎÉÅÍ ÓËÁÌÑÒÁ, ÓÓÙÌËÉ ÎÁ ËÏÄ ÉÌÉ ÓÓÙÌËÉ ÎÁ ÍÁÓÓÉ×, × ËÏÔÏÒÏÍ ÐÅÒ×ÙÊ ÜÌÅÍÅÎÔ - ÓÓÙÌËÁ ÎÁ ËÏÄ (ÓÍ. ÐÒÉÍÅÒ ÎÉÖÅ).

In the simpliest case parameter definition can be just zero-based number of the only placeholder corresponding to this parameter. In more complex cases is is hash reference. This hash must have n key with value of integer or list of integers and may have dflt key, which value must be scalar, code reference or array reference (where first element is code reference).

ëÌÀÞ n ÏÐÒÅÄÅÌÑÅÔ (zero based) ÎÏÍÅÒÁ placeholder-Ï× × ×ÙÐÏÌÎÑÅÍÏÍ select-ÚÁÐÒÏÓÅ, ÎÁ ÍÅÓÔÏ ËÏÔÏÒÙÈ ÂÕÄÅÔ ÐÏÄÓÔÁ×ÌÑÔØÓÑ ÚÎÁÞÅÎÉÅ ÜÔÏÇÏ ÐÁÒÁÍÅÔÒÁ, Á dflt - ÕÍÏÌÞÁÔÅÌØÎÏÅ ÚÎÁÞÅÎÉÅ ÄÌÑ ÏÐÃÉÏÎÁÌØÎÙÈ ÐÁÒÁÍÅÔÒÏ×. åÓÌÉ ÚÎÁÞÅÎÉÅ dflt ÅÓÔØ ÓÓÙÌËÁ ÎÁ ËÏÄ, ÔÏ × ËÁÞÅÓÔ×Å ÕÍÏÌÞÁÔÅÌØÎÏÇÏ ÚÎÁÞÅÎÉÑ ÐÒÉÎÉÍÁÅÔÓÑ ÒÅÚÕÌØÔÁÔ ×ÙÚÏ×Á ÂÅÚ ÐÁÒÁÍÅÔÒÏ× ÕËÁÚÁÎÎÏÊ ÆÕÎËÃÉÉ. åÓÌÉ dflt ÅÓÔØ ÓÓÙÌËÁ ÎÁ ÍÁÓÓÉ×, ÔÏ ÐÅÒ×ÙÊ ÜÌÅÍÅÎÔ ÜÔÏÇÏ ÍÁÓÓÉ×Á ÄÏÌÖÅÎ ÂÙÔØ ÓÓÙÌËÏÊ, ÎÁ ËÏÄ, É ÕÍÏÌÞÁÔÅÌØÎÙÍ ÚÎÁÞÅÎÉÅÍ ÄÌÑ ÐÁÒÁÍÅÔÒÁ ÐÒÉÎÉÍÁÅÔÓÑ ÒÅÚÕÌØÔÁÔ ×ÙÚÏ×Á ÕËÁÚÁÎÎÏÇÏ ËÏÄÁ Ó ÐÁÒÁÍÅÔÒÁÍÉ - ÏÓÔÁÌØÎÙÍÉ ÜÌÅÍÅÎÔÁÍÉ ÍÁÓÓÉ×Á.

The n key defines zero based number (or numbers) of placeholdes in source select query corresponding to this parameter. The dflt key defines default value for optional parameters. If value of dflt is code reference then default value is result of this code call (without arguments). If value of dflt is array reference then first element of this array must be code reference. Default value of parameter in this case is result of call this code with arguments - the rest of array.

ðÒÉÍÅÒ ÏÐÉÓÁÎÉÑ ÐÁÒÁÍÅÔÒÏ×.

Sample of parameter definition.

  $rep = DBIx::Repgen->new(
    ...
    param => {
      name => 0,
      dep => {n => 1},
      startdate => {n => [2, 4], dflt => '2000/01/01'},
      enddate => {n => 3, dflt => \&DefEndDate},
      salary => {n => 5, dflt => [sub {...}, 1000, 2000]}
    }
  );

÷ ÐÒÉÍÅÒÅ name É dep - ÏÂÑÚÁÔÅÌØÎÙÅ ÐÁÒÁÍÅÔÒÙ, ÐÏÄÓÔÁ×ÌÑÅÍÙÅ ÎÁ ÍÅÓÔÏ ÎÕÌÅ×ÏÇÏ É ÐÅÒ×ÏÇÏ placeholder-Ï×. startdate ÉÍÅÅÔ Ñ×ÎÏ ÚÁÄÁÎÎÏÅ ÕÍÏÌÞÁÎÉÅ, É ÐÏÄÓÔÁ×ÌÑÅÔÓÑ ÎÁ ÍÅÓÔÏ ×ÔÏÒÏÇÏ É ÞÅÔ×ÅÒÔÏÇÏ placeholder-Á. enddate É salary ÉÍÅÀÔ ÕÍÏÌÞÁÎÉÑ, ÏÐÒÅÄÅÌÑÅÍÙÅ ×ÙÚÏ×ÁÍÉ ËÏÄÁ ÐÒÉ ×ÙÐÏÌÎÅÎÉÉ ÏÔÞÅÔÁ, ÂÅÚ ÐÁÒÁÍÅÔÒÏ× É Ó ÐÁÒÁÍÅÔÒÁÍÉ, ÓÏÏÔ×ÅÔÓÔ×ÅÎÎÏ.

In the example name and dep are required parameters corresponding to zero and first placeholders. startdate has explicit default value and substituted to second and fouth placeholders. enddate and salary have defaults defining by code call in report run time, without and with arguments in correspondence.

output - the way of report output ÓÐÏÓÏ ×Ù×ÏÄÁ ÐÏÌÕÞÅÎÎÏÇÏ ÏÔÞÅÔÁ

ðÁÒÁÍÅÔÒ output ËÏÎÓÔÒÕËÔÏÒÁ ÏÐÒÅÄÅÌÑÅÔ ÓÐÏÓÏ ×Ù×ÏÄÁ ÐÏÌÕÞÅÎÎÏÇÏ ÏÔÞÅÔÁ. ïÎ ÍÏÖÅÔ ÐÒÉÎÉÍÁÔØ ÓÌÅÄÕÀÝÉÅ ÚÎÁÞÅÎÉÑ.

The output constructor's parameter sets how and where the report puts its output data.

undef or not present

÷ ÜÔÏÍ ÓÌÕÞÁÅ ×ÅÓØ ÓÆÏÒÍÉÒÏ×ÁÎÎÙÊ ÏÔÞÅÔ ×ÏÚ×ÒÁÝÁÅÔÓÑ ËÁË ÒÅÚÕÌØÔÁÔ ×ÙÚÏ×Á ÍÅÔÏÄÁ run.

The whole output data are the result of run method call.

string reference

ðÒÉ ÜÔÏÍ ÏÞÅÒÅÄÎÁÑ ÓÆÏÒÍÉÒÏ×ÁÎÎÁÑ ÐÏÒÃÉÑ ÏÔÞÅÔÁ ÂÕÄÅÔ ÄÏÂÁ×ÌÑÔØÓÑ Ë ÕËÁÚÁÎÎÏÊ ÓÔÒÏËÅ.

The output data are put into this string.

code reference

äÌÑ ×Ù×ÏÄÁ ÏÞÅÒÅÄÎÏÊ ÇÏÔÏ×ÏÊ ÐÏÒÃÉÉ ÏÔÞÅÔÁ ÂÕÄÅÔ ×ÙÚÙ×ÁÔØÓÑ ÕËÁÚÁÎÎÁÑ ÆÕÎËÃÉÑ, ÐÒÉ ÜÔÏÍ ÂÕÄÕÔ ÐÅÒÅÄÁÎÙ Ä×Á ÐÁÒÁÍÅÔÒÁ - ÓÏÂÓÔ×ÅÎÎÏ ÏÂßÅËÔ ÏÔÞÅÔÁ É ×Ù×ÏÄÉÍÁÑ ÓÔÒÏËÁ.

This code will be called with two arguments: the report object and string to be out.

Output samples.

 $r = DBIx::Repgen(...);
 print $r->run();

 $s = '';
 $r = DBIx::Repgen(..., output => \$s,);
 $r->run();
 print $s;

 sub myprint {
   my ($r, $s) = @_;
   print "*** $s ***";
 }
 $r = DBIx::Repgen(..., output => \&myprint,);
 $r->run();
group - repport groupping

ïÔÞÅÔ ÍÏÖÅÔ ÂÙÔØ ÓÇÒÕÐÐÉÒÏ×ÁÎ. çÒÕÐÐÁ - ÜÔÏ ÐÏÓÌÅÄÏ×ÁÔÅÌØÎÏÓÔØ ÚÁÐÉÓÅÊ, ×ÏÚ×ÒÁÝÅÎÎÙÈ ÓÅÒ×ÅÒÏÍ, × ËÏÔÏÒÙÈ ÚÎÁÞÅÎÉÅ ËÁËÏÇÏ-ÔÏ ÐÏÌÑ (ÎÁÚÙ×ÁÅÍÏÇÏ ÇÒÕÐÐÏ×ÙÍ ÐÏÌÅÍ) ÏÓÔÁÅÔÓÑ ÐÏÓÔÏÑÎÎÙÍ. ÷ ÏÔÞÅÔÅ ÍÏÖÅÔ ÂÙÔØ ÎÅÓËÏÌØËÏ ×ÌÏÖÅÎÎÙÈ ÇÒÕÐÐ. äÌÑ ÕËÁÚÁÎÉÑ ÇÒÕÐÐ × ÏÔÞÅÔÅ ÎÁÄÏ ÏÐÒÅÄÅÌÉÔØ ÚÎÁÞÅÎÉÅ ÜÌÅÍÅÎÔÁ group ÐÁÒÁÍÅÔÒÁ ËÁË ÓÓÙÌËÕ ÎÁ ÍÁÓÓÉ× ÉÚ ÉÍÅÎ ÇÒÕÐÐÏ×ÙÈ ÐÏÌÅÊ.

The report may be groupped. The group is sequence of records having the constant value of some field. This field called group field. The report may have several includded groups. For group setting you have to define group parameter of report constructor as a reference to an array of group fields.

óÌÅÄÕÅÔ ÏÔÍÅÔÉÔØ, ÞÔÏ ÐÒÁ×ÉÌØÎÁÑ ÐÏÓÌÅÄÏ×ÁÔÅÌØÎÏÓÔØ ÚÁÐÉÓÅÊ ÄÌÑ ÇÒÕÐÐÉÒÏ×ËÉ ÄÏÌÖÎÁ ÏÂÅÓÐÅÞÉ×ÁÔØÓÑ ÕËÁÚÁÎÉÅÍ × select-ÏÐÅÒÁÔÏÒÅ ÎÕÖÎÏÊ ÞÁÓÔÉ order by. îÁÐÒÉÍÅÒ ÄÌÑ ÇÒÕÐÐÉÒÏ×ËÉ ÄÁÎÎÙÈ ÏÔÞÅÔÁ ÐÏ ÓÔÒÁÎÁÍ É ÇÏÒÏÄÁÍ ÍÏÇ ÂÙ ÐÒÉÍÅÎÑÔØÓÑ ÔÁËÏÊ ËÏÎÓÔÒÕËÔÏÒ.

Note that the right record's sequence must be provided by order part in used select query, not by report itself. Sample of grouping by countries and cities.

 $r = DBIx::Repgen->new(
   ...,
   query => "select country, city, population from cities
             order by country, city",
   group => [qw/COUNTRY CITY/],
   ...
 );

ïÂÒÁÝÁÅÍ ×ÎÉÍÁÎÉÅ ÎÁ ÔÏ, ÞÔÏ ×ÓÅ ÉÍÅÎÁ ÐÏÌÅÊ ÐÏÌÕÞÅÎÎÙÈ ÄÁÎÎÙÈ ÚÁÐÉÓÙ×ÁÀÔÓÑ × ×ÅÒÈÎÅÍ ÒÅÇÉÓÔÒÅ, ÎÅÚÁ×ÉÓÉÍÏ ÏÔ ÉÓÐÏÌØÚÕÅÍÏÇÏ ÓÅÒ×ÅÒÁ âä.

Note all field names are in uppercase, regardless used database server.

total - cumulative totals ÎÁÒÁÓÔÁÀÝÉÅ ÉÔÏÇÉ

úÎÁÞÅÎÉÅ ÜÔÏÇÏ ÁÒÇÕÍÅÎÔÁ - ÓÓÙÌËÁ ÎÁ ÓÐÉÓÏË, ÓÏÄÅÒÖÁÝÉÊ ÉÍÅÎÁ ÐÏÌÅÊ ÏÔÞÅÔÁ, ÐÏ ËÏÔÏÒÙÍ ÎÁÄÏ ÐÒÏÉÚ×ÏÄÉÔØ ÓÕÍÍÉÒÏ×ÁÎÉÅ. óÕÍÍÉÒÏ×ÁÎÉÅ ÄÌÑ ËÁÖÄÏÇÏ ÐÏÌÑ ÂÕÄÅÔ ÐÒÏÉÚ×ÏÄÉÔØÓÑ ËÁË × ÐÒÅÄÅÌÁÈ ×ÓÅÇÏ ÏÔÞÅÔÁ, ÔÁË É ÐÏ ËÁÖÄÏÊ ÉÚ ÇÒÕÐÐ. ï ÄÏÓÔÕÐÅ Ë ÚÎÁÞÅÎÉÑÍ ÓÕÍÍÁÔÏÒÏ× ÓÍ. ÎÉÖÅ.

Value of this constructor's argument is reference to array with report fields to compute totals. Each field summation executed for all the report as well as for each group. See below about access to totals values.

header, footer, item etc. - definition of report parts É ÐÒ. - ÆÏÒÍÁÔÉÒÏ×ÁÎÉÅ ÞÁÓÔÅÊ ÏÔÞÅÔÁ

ðÒÉ ×Ù×ÏÄÅ ÏÔÞÅÔÁ ÆÏÒÍÉÒÕÀÔÓÑ ÓÌÅÄÕÀÝÉÅ ÅÇÏ "ÞÁÓÔÉ" (parts).

There are following parts during report output.

item

÷Ù×ÏÄÉÔÓÑ ÄÌÑ ËÁÖÄÏÊ ÚÁÐÉÓÉ ÏÔÞÅÔÁ.

Outputs for each report's record.

header

÷Ù×ÏÄÉÔÓÑ × ÎÁÞÁÌÅ ×ÓÅÇÏ ÏÔÞÅÔÁ.

Begin of whole report.

÷Ù×ÏÄÉÔÓÑ × ÓÁÍÏÍ ËÏÎÃÅ ÏÔÞÅÔÁ.

Outputs after all, in the end of report.

header_GROUPFIELD

÷Ù×ÏÄÉÔÓÑ × ÎÁÞÁÌÅ ÇÒÕÐÐÙ ÚÁÐÉÓÅÊ ÐÏ ÐÏÌÀ GROUPFIELD.

Outputs in the begin of record group by GROUPFIELD field.

÷Ù×ÏÄÉÔÓÑ × ËÏÎÃÅ ÇÒÕÐÐÙ ÚÁÐÉÓÅÊ ÐÏ ÐÏÌÀ GROUPFIELD.

Outputs after record group by GROUPFIELD field.

æÏÒÍÁÔÉÒÏ×ÁÎÉÅ ËÁÖÄÏÊ ÉÚ ÜÔÉÈ ÇÒÕÐÐ (Ô.Å. ÚÎÁÞÅÎÉÅ ÓÏÏÔ×ÅÔÓÔ×ÕÀÝÅÇÏ ÐÁÒÁÍÅÔÒÁ ËÏÎÓÔÒÕËÔÏÒÁ) ÍÏÖÅÔ ÚÁÄÁ×ÁÔØÓÑ ÏÄÎÉÍ ÉÚ ÓÌÅÄÕÀÝÉÈ ÍÅÔÏÄÏ×.

Each of these report pats may be defined by several ways.

string ÓÔÒÏËÁ

õËÁÚÁÎÎÁÑ ÓÔÒÏËÁ ÂÕÄÅÔ ×Ù×ÏÄÉÔØÓÑ "ËÁË ÅÓÔØ", ÂÅÚ ×ÓÑËÏÊ ÄÏÐÏÌÎÉÔÅÌØÎÏÊ ÏÂÒÁÂÏÔËÉ.

The string will be printed "as is", without any procession.

 $r = DBIx::Repgen->new(
   header => "\t\tReport about countries and cities\n",
   ...
 );
 
reference to array of strings ÕËÁÚÁÔÅÌØ ÎÁ ÓÐÉÓÏË ÓÔÒÏË

ðÅÒ×ÙÊ ÜÌÅÍÅÎÔ ÜÔÏÇÏ ÓÐÉÓËÁ ÒÁÓÓÍÁÔÉÒÉ×ÁÅÔÓÑ ËÁË ÆÏÒÍÁÔ ÆÕÎËÃÉÉ sprintf, Á ÏÓÔÁÌØÎÙÅ - ËÁË ÉÍÅÎÁ (Á ÎÅ ÚÎÁÞÅÎÉÑ!) × ÔÅËÕÝÉÈ ÄÁÎÎÙÈ ÏÔÞÅÔÁ. ï ÜÔÉÈ ÉÍÅÎÁÈ ÓÍ. ÎÉÖÅ.

First element of this array have to be in form of sprintf function format. The rest of values in the array are names (no values!) of current report data. See below about current report data.

 $r = DBIx::Repgen->new(
   footer => ["Total %d countries, %d cities, population %d people\n",
              qw/num_COUNTRY num_CITY sum_POPULATION/],
   ...
 );
code reference ÓÓÙÌËÁ ÎÁ ËÏÄ

õËÁÚÁÎÎÁÑ ÆÕÎËÃÉÑ ×ÙÚÙ×ÁÅÔÓÑ Ó Ä×ÕÍÑ ÐÁÒÁÍÅÔÒÁÍÉ - ÏÂßÅËÔÏÍ ÏÔÞÅÔÁ É ÕËÁÚÁÔÅÌÅÍ ÎÁ ÈÜÛ - ÈÒÁÎÉÌÉÝÅ ÔÅËÕÝÉÈ ÄÁÎÎÙÈ ÏÔÞÅÔÁ.

The code is called with two arguments: report object and hash reference storing current report data. Subroutine may use Output method for output any needed information or just return output string as its result.

 $r = DBIx::Repgen->new(
   item => sub {
     my ($r, $d) = @_;
     $r->Output("%d %s",
                $d->{POPULATION},
                $d->{POPULATION} > 1_000_000 ? '*' : ' ');
   }

   footer => sub {return "Report ended at " . `date`}
   ...
 );
reference to array where first element is code reference ÓÓÙÌËÁ ÎÁ ÓÐÉÓÏË, × ËÏÔÏÒÏÍ ÐÅÒ×ÙÊ ÜÌÅÍÅÎÔ - ÓÓÙÌËÁ ÎÁ ËÏÄ

õËÁÚÁÎÎÙÊ ÆÒÁÇÍÅÎÔ ËÏÄÁ ×ÙÚÙ×ÁÅÔÓÑ ÓÏ ÓÌÅÄÕÀÝÉÍÉ ÐÁÒÁÍÅÔÒÁÍÉ: ÏÂßÅËÔ ÏÔÞÅÔÁ, ÈÜÛ Ó ÔÅËÕÝÉÍÉ ÄÁÎÎÙÍÉ ÏÔÞÅÔÁ, ×ÓÅ ÏÓÔÁÌØÎÙÅ ÜÌÅÍÅÎÔÙ ÓÐÉÓËÁ.

The code is called with following arguments: report object, current report data, the rest of array elements.

 $r = DBIx::Repgen->new(
   header_COUNTRY => [\&hfcountry, 'header'],
   header_COUNTRY => [\&hfcountry, 'footer'],
   ...
 );

 sub hfcountry {
  my ($r, $d, $header_or_footer) = @_;
  if ($header_or_footer eq 'header') {...} else {...};
 }
max_items - max record number limit ÏÇÒÁÎÉÞÅÎÉÅ ËÏÌÉÞÅÓÔ×Á ×Ù×ÏÄÉÍÙÈ ÚÁÐÉÓÅÊ

åÓÌÉ ËÏÎÓÔÒÕËÔÏÒÕ ÏÔÞÅÔÁ ÐÅÒÅÄÁÅÔÓÑ ÜÔÏÔ ÐÁÒÁÍÅÔÒ (ÃÅÌÏÅ ÞÉÓÌÏ), ÔÏ ÂÕÄÅÔ ×Ù×ÅÄÅÎÏ ÎÅ ÂÏÌÅÅ max_items ÚÁÐÉÓÅÊ. õÚÎÁÔØ Ï ÔÏÍ, ×ÙÄÅÎÙ ×ÓÅ ÚÁÐÉÓÉ ÉÌÉ ÎÅÔ ÍÏÖÎÏ ×ÙÚÏ×ÏÍ ÍÅÔÏÄÁ Aborted (ÓÍ. ÎÉÖÅ).

If this parameter (integer number) is present then no more than max_items records will be output. It is possible to know if not all records were output via Aborted method call.

Current report data ôÅËÕÝÉÅ ÄÁÎÎÙÅ ÏÔÞÅÔÁ

ðÒÉ ×Ù×ÏÄÅ ÏÔÞÅÔÁ ×Ï ×ÎÕÔÒÅÎÎÉÈ ÐÅÒÅÍÅÎÎÙÈ ÏÂßÅËÔÁ ÏÔÞÅÔÁ ÈÒÁÎÑÔÓÑ ×ÓÅ ÄÁÎÎÙÅ, ÏÐÒÅÄÅÌÑÀÝÉÅ ÔÅËÕÝÅÅ ÓÏÓÔÏÑÎÉÅ ÏÔÞÅÔÁ. ðÒÉ ×Ù×ÏÄÅ ÒÁÚÌÉÞÎÙÈ ÓÅËÃÉÊ ÏÔÞÅÔÁ ÄÏÓÔÕÐ Ë ÜÔÉÍ ÄÁÎÎÙÍ ÐÒÏÉÚ×ÏÄÉÔÓÑ ÐÏ ÉÈ ÉÍÅÎÁÍ. óÒÅÄÉ ÔÅËÕÝÉÈ ÄÁÎÎÙÈ ÏÔÞÅÔÁ ÉÍÅÀÔÓÑ ÔÁËÉÅ ÐÏÌÑ.

All report state data are stored in internal report variables. Access to these data from report parts is possible by data names. There are following fields in current report data.

FIELDNAME

ðÏÌÑ ÔÅËÕÝÅÊ ÚÁÐÉÓÉ ÏÔÞÅÔÁ, ÐÏÌÕÞÅÎÎÙÅ ÉÚ âä ÏÐÅÒÁÔÏÒÏÍ select × ×ÅÒÈÎÅÍ ÒÅÇÉÓÔÒÅ.

Fields of current report's record. Name is in uppercase.

prev_FIELDNAME

úÎÁÞÅÎÉÅ ÜÔÏÇÏ ÐÏÌÑ × ÐÒÅÄÙÄÕÝÅÊ ÚÁÐÉÓÉ ÏÔÞÅÔÁ. ïÂÒÁÝÅÎÉÅ Ë ÜÔÉÍ ÐÏÌÑÍ ÃÅÌÅÓÏÏÂÒÁÚÎÏ ÐÒÉ ×Ù×ÏÄÅ ÚÁ×ÅÒÛÉÔÅÌÅÊ ÇÒÕÐÐ - ÔÁË ËÁË ÏÏÂÎÁÒÕÖÅÎÁ ÇÒÁÎÉÃÁ ÇÒÕÐÐÙ, ÔÏ ÚÎÁÞÅÎÉÅ ÇÒÕÐÐÏ×ÏÇÏ ÐÏÌÑ ÕÖÅ ÉÚÍÅÎÉÌÏÓØ, ÎÏ ÐÒÅÄÙÄÕÝÅÅ ÅÇÏ ÚÎÁÞÅÎÉÅ, Ô.Å. ÚÎÁÞÅÎÉÅ ÄÌÑ ÔÏÌØËÏ ÞÔÏ ÚÁ×ÅÒÛÉ×ÛÅÊÓÑ ÇÒÕÐÐÅ, ÅÝÅ ÈÒÁÎÉÔÓÑ.

Value of FIELDNAME in previous record. When group boundary is detected group field has new value, but its previous value is still stored. This value can be used in group footers.

num_report

îÏÍÅÒ ×Ù×ÏÄÉÍÏÊ ÚÁÐÉÓÉ × ÐÒÅÄÅÌÁÈ ×ÓÅÇÏ ÏÔÞÅÔÁ. üÔÏÔ ÎÏÍÅÒ ÎÅ ÓÂÒÁÓÙ×ÁÅÔÓÑ × ÐÒÏÃÅÓÓÅ ×Ù×ÏÄÁ ÏÔÞÅÔÁ.

Number (one-based) of current output record for the whole report. This counter never resets.

num_item

îÏÍÅÒ ×Ù×ÏÄÉÍÏÊ ÚÁÐÉÓÉ × ÐÒÅÄÅÌÁÈ ÇÒÕÐÐÙ ÓÁÍÏÇÏ ÍÌÁÄÛÅÇÏ ÕÒÏ×ÎÑ.

Number of record in the innermost group.

num_GROUPNAME

ÎÏÍÅÒ ÓÏÏÔ×ÅÔÓÔ×ÕÀÝÅÊ ÇÒÕÐÐÙ ×ÎÕÔÒÉ ÇÒÕÐÐÙ ÂÏÌÅÅ ×ÙÓÏËÏÇÏ ÕÒÏ×ÎÑ.

Number of group GROUPNAME in including group.

total_FIELDNAME

óÕÍÍÁÔÏÒ ÐÏ ÄÁÎÎÏÍÕ ÐÏÌÀ × ÐÒÅÄÅÌÁÈ ×ÓÅÇÏ ÏÔÞÅÔÁ. îÁÐÏÍÎÉÍ, ÞÔÏ FIELDNAME ÄÏÌÖÎÏ ÂÙÔØ ÐÅÒÅÞÉÓÌÅÎÏ × ÐÁÒÁÍÅÔÒÅ total ËÏÎÓÔÒÕËÔÏÒÁ.

Cumulative total of FIELDNAME field for the whole report. Remember FIELDNAME must be listed in total constructor's parameter.

total_GROUPNAME_FIELDNAME

óÕÍÍÁÔÏÒ ÐÏ ÄÁÎÎÏÍÕ ÐÏÌÀ × ÐÒÅÄÅÌÁÈ ÕËÁÚÁÎÎÏÊ ÇÒÕÐÐÙ.

Cumulative total by FIELDNAME field into GROUPNAME. These summators are reset each time the group boundary is reached.

run, report execution ×ÙÐÏÌÎÅÎÉÅ ÏÔÞÅÔÁ

 $r->run(%param);

÷ÙÐÏÌÎÑÅÔÓÑ É ×Ù×ÏÄÉÔÓÑ ÏÔÞÅÔ. ðÁÒÅÍÅÔÒÙ ÍÅÔÏÄÁ ÐÅÒÅÄÁÀÔÓÑ × ËÁÞÅÓÔ×Å ÚÎÁÞÅÎÉÊ placeholder-Ï× ÍÅÔÏÄÕ execute ÏÐÅÒÁÔÏÒÁ (ÓÍ. ×ÙÛÅ Ï ÏÐÉÓÁÎÉÉ ÐÁÒÁÍÅÔÒÏ× ÏÔÞÅÔÁ). åÓÌÉ × ËÏÎÓÔÒÕËÔÏÒÅ ÏÔÞÅÔÁ ÎÅ ÂÙÌ ÚÁÄÁÎ ÐÁÒÁÍÅÔÒ output, ÔÏ ÔÅËÓÔ ÏÔÞÅÔÁ Ñ×ÌÑÅÔÓÑ ÒÅÚÕÌØÔÁÔÏÍ ×ÙÚÏ×Á ÍÅÔÏÄÁ.

The report is run and output. Input parameters are substituted as values for select query placeholders (see above) about report's parameters. If there was no output constructor's parameter then the text of report returned as a result of this method.

Output

 $r->Output("Any values: %s and %d", 'qazwsx', 654);

áÒÇÕÍÅÔÎÙ ÍÅÔÏÄÁ - ÔÅ ÖÅ, ÞÔÏ Õ ÆÕÎËÃÉÉ sprintf. íÅÔÏÄ ÄÏÂÁ×ÌÑÅÔ ÓÆÏÒÍÁÔÉÒÏ×ÁÎÎÕÀ ÓÔÒÏËÕ Ë ×ÙÈÏÄÎÏÍÕ ÐÏÔÏËÕ ÏÔÞÅÔÁ (ÏÐÒÅÄÅÌÅÎÎÕÀ ÐÁÒÁÍÅÔÒÏÍ output). üÔÉÍ ÍÅÔÏÄÏÍ ÍÏÖÎÏ ÐÏÌØÚÏ×ÁÔØÓÑ × ËÏÄÅ, ×ÙÚÙ×ÁÅÍÏÍ ÐÒÉ ×Ù×ÏÄÅ ÒÁÚÌÉÞÎÙÈ ÞÁÓÔÅÊ ÏÔÞÅÔÁ.

This method has the same arguments as sprintf function. It adds formatted string to the output stream (set by output param). This method is useful in the code called during the output of report parts.

Get, querying of report parameters ÏÐÒÏÓ ÐÁÒÁÍÅÔÒÏ× ÏÔÞÅÔÁ

  @group = @{$r->Get('group')};

íÅÔÏÄ ×ÏÚ×ÒÁÝÁÅÔ ÚÎÁÞÅÎÉÅ ÕËÁÚÁÎÎÏÇÏ ÐÁÒÁÍÅÔÒÁ, ÐÅÒÅÄÁÎÎÏÇÏ ÒÁÎÅÅ ËÏÎÓÔÒÕËÔÏÒÕ ËÌÁÓÓÁ ÉÌÉ ÕÓÔÁÎÏ×ÌÅÎÎÏÇÏ ÍÅÔÏÄÏÍ Set.

Method returns value of named parameter which is set in constructor or via Set method.

Set, setting report parameters ÕÓÔÁÎÏ×ËÁ ÐÁÒÁÍÅÔÒÏ× ÏÔÞÅÔÁ

 $r->Set(
   header => "Very new header",
   item => ["%s %s", qw/NAME VALUE/]
 );

íÅÔÏÄ ÐÅÒÅÏÐÒÅÄÅÌÑÅÔ ÐÁÒÁÍÅÔÒÙ ÏÔÞÅÔÁ.

Method redefines report parameters.

Abort

 $r->Abort();

âÕÄÕÞÉ ×ÙÚ×ÁÎÎÙÍ × ËÏÄÅ, ×ÙÐÏÌÎÑÅÍÏÍ ÐÒÉ ×Ù×ÏÄÅ ÞÁÓÔÅÊ ÏÔÞÅÔÁ ÜÔÏÔ ÍÅÔÏÄ ÐÒÅËÒÁÝÁÅÔ ÄÁÌØÎÅÊÛÅÅ ×ÙÐÏÌÎÅÎÉÅ ÏÔÞÅÔÁ.

Being called in the code it breaks report running.

Aborted

  if ($r->Aborted()) {...}

íÅÔÏÄ ÐÏÚ×ÏÌÑÅÔ ÕÚÎÁÔØ - ÂÙÌÏ ÌÉ ×ÙÐÏÌÎÅÎÉÅ ÏÔÞÅÔÁ ÐÒÅÒ×ÁÎÏ ÍÅÔÏÄÏÍ Abort ÉÌÉ ÂÙÌÉ ×Ù×ÅÄÅÎÙ ×ÓÅ ÚÁÐÉÓÉ ÄÁÎÎÙÈ.

Method returns true if report excution was aborted by Abort method.

EXAMPLE

ðÒÉ×ÅÄÅÍ ÐÏÌÎÙÊ ÐÒÉÍÅÒ ÓËÒÉÐÔÁ, ÒÁÂÏÔÁÀÝÅÇÏ Ó ÇÅÎÅÒÁÔÏÒÏÍ ÏÔÞÅÔÏ× É ÅÇÏ ÒÅÚÕÌØÔÁÔ. äÁÎÎÙÅ ÄÌÑ ÏÔÞÅÔÁ ÂÅÒÕÔÓÑ ÉÚ ÔÁÂÌÉÃÙ, ÉÍÅÀÝÅÊ ÔÁËÕÀ ÓÔÒÕËÔÕÒÕ:

Full example of report and its result. The data are taken from data table having following structure.

 create table population (
  country varchar2(30) not null,
  city varchar2(30) not null,
  population int not null
 );

äÁÌÅÅ ÐÒÉ×ÅÄÅÎ ÐÏÌÎÙÊ ÔÅËÓÔ ÓËÒÉÐÔÁ É ÒÅÚÕÌØÔÁÔÙ ÅÇÏ ÒÁÂÏÔÙ (ÎÁ ÓÏ×ÅÒÛÅÎÎÏ ÕÓÌÏ×ÎÙÈ ÄÁÎÎÙÈ!).

Full text of the perl script and output data are following. These are just demo data!

 #!/usr/bin/perl -w

 use strict;
 use DBI;
 use DBIx::Repgen;

 my $dbh = DBI->connect('dbi:Oracle:SID',
                    'user', 'password') or die $@;
 my $sth = $dbh->prepare(<<EOM);
 select
  country,
  city,
  population
 from
  population
 order by
  country,
  city
 EOM

 my $r = DBIx::Repgen->new
  (
   sth => $sth,
   group => [qw/COUNTRY/],
   total => [qw/POPULATION/],

   header => [\&makeheader,
              '=', "Countries, cities and thier population"],
   footer => ["Total %d countries, %d cities, %d people\n",
              qw/num_COUNTRY num_report total_POPULATION/],

   header_COUNTRY => sub {
     my (undef, $d) = @_;
     return makeheader(undef, undef, '-', $d->{COUNTRY});
   },
   footer_COUNTRY => ["%d cities, %d people in %s\n\n",
          qw/num_item total_COUNTRY_POPULATION prev_COUNTRY/],

   item => ["\t\t%-20s %10d\n", qw/CITY POPULATION/],
  );

 print $r->run();

 sub makeheader {
  my (undef, undef, $c, $s) = @_;
  return sprintf("%s\n%s\n%s\n", $c x length($s), $s, $c x length($s));
 }

 ======================================
 Countries, cities and thier population
 ======================================
 ---------
 Australia
 ---------
                Kanberra                 900000
                Sidney                  6400000
 2 cities, 7300000 people in Australia

 ------
 Russia
 ------
                Moscow                  9500000
                Rostov-on-Don           1200000
                St.Petersberg           4500000
                Taganrog                 250000
 4 cities, 15450000 people in Russia

 ---
 USA
 ---
                Los Angeles             4000000
                New York               12000000
                Washington              2000000
 3 cities, 18000000 people in USA

 Total 3 countries, 9 cities, 40750000 people

3 POD Errors

The following errors were encountered while parsing the POD:

Around line 33:

Non-ASCII character seen before =encoding in 'íÏÄÕÌØ'. Assuming ISO8859-1

Around line 402:

You forgot a '=back' before '=head3'

Around line 465:

=back without =over