234 lines
8.4 KiB
Plaintext
234 lines
8.4 KiB
Plaintext
Ora2Pg - Oracle to PostgreSQL database schema converter
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_________________________________________________________________
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SYNOPSIS
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BEGIN {
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$ENV{ORACLE_HOME} = '/usr/local/oracle/oracle816';
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}
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use strict;
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use Ora2Pg;
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# Init the database connection
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my $dbsrc = 'dbi:Oracle:host=testdb.samse.fr;sid=TEST;port=1521';
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my $dbuser = 'system';
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my $dbpwd = 'manager';
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# Create an instance of the Ora2Pg perl module
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my $schema = new Ora2Pg (
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datasource => $dbsrc, # Database DBD datasource
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user => $dbuser, # Database user
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password => $dbpwd, # Database password
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);
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# Create the POSTGRESQL representation of all objects in the database
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$schema->export_schema("output.sql");
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exit(0);
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_________________________________________________________________
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DESCRIPTION
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Ora2Pg is a perl OO module used to export an Oracle database schema to
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a PostgreSQL compatible schema.
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It simply connect to your Oracle database, extract its structure and
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generate a SQL script that you can load into your PostgreSQL database.
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I'm not a Oracle DBA so I don't really know something about its
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internal structure so you may find some incorrect things. Please tell
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me what is wrong and what can be better.
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It currently only dump the database schema, with primary, unique and
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foreign keys. I've tried to excluded internal system tables but
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perhaps not enougt, please let me know.
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_________________________________________________________________
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ABSTRACT
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The goal of the Ora2Pg perl module is to cover all part needed to
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export an Oracle database to a PostgreSQL database without other thing
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that provide the connection parameters to the Oracle database.
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Features must include:
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- database schema export (done)
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- grant export (done)
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- predefined function/trigger export (todo)
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- data export (todo)
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- sql query converter (todo)
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My knowledge regarding database is really poor especially for Oracle
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so contribution is welcome.
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_________________________________________________________________
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REQUIREMENT
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You just need the DBI and DBD::Oracle perl module to be installed
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_________________________________________________________________
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PUBLIC METHODS
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_________________________________________________________________
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new HASH_OPTIONS
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Creates a new Ora2Pg object.
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Supported options are:
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- datasource : DBD datasource (required)
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- user : DBD user (optional with public access)
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- password : DBD password (optional with public access)
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Attempt that this list should grow a little more because all
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initialization is done by this way.
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_________________________________________________________________
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export_sql FILENAME
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Print SQL conversion output to a filename or to STDOUT if no file is
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given.
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_________________________________________________________________
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PUBLIC METHODS
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_________________________________________________________________
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_init HASH_OPTIONS
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Initialize a Ora2Pg object instance with a connexion to the Oracle
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database.
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_________________________________________________________________
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_tables
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This function is used to retrieve all table information.
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Set the main hash of the database structure $self->{tables}. Keys are
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the names of all tables retrieved from the current database. Each
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table information compose an array associated to the table_info key as
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array reference. In other way:
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$self->{tables}{$class_name}{table_info} = [(OWNER,TYPE)];
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TYPE Can be TABLE, VIEW, SYSTEM TABLE, GLOBAL TEMPORARY, LOCAL
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TEMPORARY, ALIAS, SYNONYM or a data source specific type identifier.
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It also get the following informations in the DBI object to affect the
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main hash of the database structure :
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$self->{tables}{$class_name}{field_name} = $sth->{NAME};
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$self->{tables}{$class_name}{field_type} = $sth->{TYPE};
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It also call these other private subroutine to affect the main hash of
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the database structure :
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@{$self->{tables}{$class_name}{column_info}} = &_column_info($self, $class_
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name);
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@{$self->{tables}{$class_name}{primary_key}} = &_primary_key($self, $class_
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name);
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@{$self->{tables}{$class_name}{unique_key}} = &_unique_key($self, $class_n
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ame);
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@{$self->{tables}{$class_name}{foreign_key}} = &_foreign_key($self, $class_
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name);
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_________________________________________________________________
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_get_sql_data
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Returns a string containing the entire SQL Schema definition
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compatible with PostgreSQL
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_________________________________________________________________
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_sql_type INTERNAL_TYPE LENGTH
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This function return the PostgreSQL datatype corresponding to the
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Oracle internal type.
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_________________________________________________________________
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_column_info TABLE
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This function implements a Oracle-native column information.
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Return a list of array reference containing the following informations
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for each column the given a table
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[( column name, column type, column length, nullable column, default
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value )]
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_________________________________________________________________
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_primary_key TABLE
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This function implements a Oracle-native primary key column
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information.
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Return a list of all column name defined as primary key for the given
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table.
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_________________________________________________________________
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_unique_key TABLE
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This function implements a Oracle-native unique key column
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information.
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Return a list of all column name defined as unique key for the given
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table.
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_________________________________________________________________
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_foreign_key TABLE
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This function implements a Oracle-native foreign key reference
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information.
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Return a list of hash of hash of array reference. Ouuf! Nothing very
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difficult. The first hash is composed of all foreign key name. The
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second hash just have two key known as 'local' and remote'
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corresponding to the local table where the foreign key is defined and
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the remote table where the key refer.
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The foreign key name is composed as follow:
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'local_table_name->remote_table_name'
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Foreign key data consist in two array representing at the same indice
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the local field and the remote field where the first one refer to the
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second. Just like this:
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@{$link{$fkey_name}{local}} = @local_columns;
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@{$link{$fkey_name}{remote}} = @remote_columns;
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_________________________________________________________________
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_get_privilege
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This function implements a Oracle-native tables grants information.
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Return a hash of all groups (roles) with associated users and a hash
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of arrays of all grants on related tables.
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_________________________________________________________________
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AUTHOR
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Gilles Darold <gilles@darold.net>
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_________________________________________________________________
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COPYRIGHT
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Copyright (c) 2001 Gilles Darold - All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the same terms as Perl itself.
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_________________________________________________________________
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BUGS
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This perl module is in the same state as my knowledge regarding
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database, it can move and not be compatible with older version so I
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will do my best to give you official support for Ora2Pg. Your volontee
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to help construct it and your contribution are welcome.
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_________________________________________________________________
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SEE ALSO
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DBI, DBD::Oracle
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