NAME

Oracle::Trigger - Perl class for creating Oracle triggers

SYNOPSIS

  use Oracle::Trigger;

  my %cfg = ('conn_string'=>'usr/pwd@db', 'table_name'=>'my_ora_tab');
  my $ot = Oracle::Trigger->new;
  # or combine the two together
  my $ot = Oracle::Trigger->new(%cfg);
  my $sql= $ot->prepare(%cfg); 
  $ot->execute();    # actually create the audit table and trigger

DESCRIPTION

This class contains methods to create audit tables and triggers for Oracle tables.

new (conn_string=>'usr/pwd@db',table_name=>'my_table')

Input variables:

  $cs  - Oracle connection string in usr/pwd@db
  $tn  - Oracle table name without schema

Variables used or routines called:

  None

How to use:

   my $obj = new Oracle::Trigger;      # or
   my $obj = Oracle::Trigger->new;     # or
   my $cs  = 'usr/pwd@db';
   my $tn  = 'my_table'; 
   my $obj = Oracle::Trigger->new(cs=>$cs,tn=>$tn); # or
   my $obj = Oracle::Trigger->new('cs',$cs, 'tn',$tn); 

Return: new empty or initialized Oracle::Trigger object.

This method constructs a Perl object and capture any parameters if specified. It creates and defaults the following variables:

  $self->{conn_string} = "";       # or $self->{cs}
  $self->{table_name}  = "";       # or $self->{tn}  

METHODS

The following are the common methods, routines, and functions defined in this class.

Exported Tag: All

The :all tag includes all the methods or sub-rountines defined in this class.

  use Oracle::Trigger qw(:all);

It includes the following sub-routines: =head3 prepare($cs, $tn, $tp)

Input variables:

  $cs  - Oracle connection string in usr/pwd@db
  $tn  - Oracle table name without schema
  $tp  - trigger type
         DATA - trigger to audit a table. This is the default.

Variables used or routines called:

  Debug::EchoMessage
    echoMSG - display message
  {cs} - connection string
  {tn} - table name 
  {drop_audit}   - whether to drop audit table if it exists
  {audit_table}  - audit table name, default to aud${$tn}
  {trigger_name} - trigger name, default to trg${$tn}

How to use:

  my $ar = $self->prepare('usr/pwd@db','my_tab');

Return: $hr - a hash array ref containing the following keys:

  dbh         - the database handler
  sql_audit   - SQL statement for creating the audit table
  sql_trigger - SQL statement for creating the trigger

This method performs the following tasks:

  1) create a database handler
  2) check the existance of the table 
  3) generate script for creating audit table
  4) generate script for creating trigger

And it sets the following internal variable as well:

  {dbh} - database handler
  {sql_audit} - sql statements to create audit table
  {sql_trigger} - sql statement to create trigger

execute($typ)

Input variables:

  $typ - action type:
         TRIGGER - create trigger only 
         AUDIT   - create audit table only
         default - null and will create both

Variables used or routines called:

  {dbh} - database handler
  {sql_audit} - sql statements to create audit table
  {sql_trigger} - sql statement to create trigger

How to use:

  my $status = $self->execute();
  $self->execute();

Return: 0|1: 0 - OK; 1 - failed

This method submits the sql statement to Oracle server to create audit table or trigger or both. The default is to create both. If the audit table exists, it will skip creating the audit table. You either need to manually drop the table or set {drop_audit} to '1' before you run prepare().

HISTORY

• Version 0.1

  This version is to test the procedures and create DATA trigger.

  04/22/2005 (htu) - finished creating DATA trigger rountines.

• Version 0.2

  04/29/2005 (htu) - modified some descriptions and moved the common routines to Oracle::DML::Common.

• Version 0.21

  Since get_table_definition is moved to Oracle::Schema, we change it here to use Oracle::Schema.

SEE ALSO (some of docs that I check often)

Data::Describe, Oracle::Loader, CGI::Getopt, File::Xcopy, perltoot(1), perlobj(1), perlbot(1), perlsub(1), perldata(1), perlsub(1), perlmod(1), perlmodlib(1), perlref(1), perlreftut(1).

AUTHOR

Copyright (c) 2005 Hanming Tu. All rights reserved.

This package is free software and is provided "as is" without express or implied warranty. It may be used, redistributed and/or modified under the terms of the Perl Artistic License (see http://www.perl.com/perl/misc/Artistic.html)

cpanm Oracle::Trigger

perl -MCPAN -e shell
install Oracle::Trigger