484 lines
21 KiB
HTML
484 lines
21 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Ora2Pg - Oracle to PostgreSQL database schema converter</TITLE>
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</HEAD>
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<BODY>
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<A NAME="__index__"></A>
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<!-- INDEX BEGIN -->
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<UL>
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<LI><A HREF="#name">NAME</A></LI>
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<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
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<LI><A HREF="#description">DESCRIPTION</A></LI>
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<LI><A HREF="#abstract">ABSTRACT</A></LI>
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<LI><A HREF="#requirement">REQUIREMENT</A></LI>
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<LI><A HREF="#public methods">PUBLIC METHODS</A></LI>
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<UL>
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<LI><A HREF="#new hash_options">new HASH_OPTIONS</A></LI>
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<LI><A HREF="#export_data filename">export_data FILENAME</A></LI>
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<LI><A HREF="#export_sql filename">export_sql FILENAME</A></LI>
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<LI><A HREF="#send_to_pgdb dest_datasrc dest_user dest_passwd">send_to_pgdb DEST_DATASRC DEST_USER DEST_PASSWD</A></LI>
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<LI><A HREF="#modify_struct table_name arrayof_fieldname">modify_struct TABLE_NAME ARRAYOF_FIELDNAME</A></LI>
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</UL>
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<LI><A HREF="#private methods">PRIVATE METHODS</A></LI>
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<UL>
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<LI><A HREF="#_init hash_options">_init HASH_OPTIONS</A></LI>
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<LI><A HREF="#_grants">_grants</A></LI>
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<LI><A HREF="#_sequences">_sequences</A></LI>
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<LI><A HREF="#_triggers">_triggers</A></LI>
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<LI><A HREF="#_functions">_functions</A></LI>
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<LI><A HREF="#_packages">_packages</A></LI>
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<LI><A HREF="#_tables">_tables</A></LI>
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<LI><A HREF="#_views">_views</A></LI>
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<LI><A HREF="#_get_sql_data">_get_sql_data</A></LI>
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<LI><A HREF="#_get_data table">_get_data TABLE</A></LI>
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<LI><A HREF="#_sql_type internal_type length precision scale">_sql_type INTERNAL_TYPE LENGTH PRECISION SCALE</A></LI>
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<LI><A HREF="#_column_info table owner">_column_info TABLE OWNER</A></LI>
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<LI><A HREF="#_primary_key table owner">_primary_key TABLE OWNER</A></LI>
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<LI><A HREF="#_unique_key table owner">_unique_key TABLE OWNER</A></LI>
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<LI><A HREF="#_foreign_key table owner">_foreign_key TABLE OWNER</A></LI>
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<LI><A HREF="#_get_users">_get_users</A></LI>
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<LI><A HREF="#_get_roles">_get_roles</A></LI>
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<LI><A HREF="#_get_all_grants">_get_all_grants</A></LI>
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<LI><A HREF="#_get_indexes table owner">_get_indexes TABLE OWNER</A></LI>
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<LI><A HREF="#_get_sequences">_get_sequences</A></LI>
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<LI><A HREF="#_get_views">_get_views</A></LI>
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<LI><A HREF="#_alias_info">_alias_info</A></LI>
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<LI><A HREF="#_get_triggers">_get_triggers</A></LI>
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<LI><A HREF="#_get_functions">_get_functions</A></LI>
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<LI><A HREF="#_get_packages">_get_packages</A></LI>
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<LI><A HREF="#_table_info">_table_info</A></LI>
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</UL>
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<LI><A HREF="#author">AUTHOR</A></LI>
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<LI><A HREF="#copyright">COPYRIGHT</A></LI>
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<LI><A HREF="#bugs">BUGS</A></LI>
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<LI><A HREF="#see also">SEE ALSO</A></LI>
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<LI><A HREF="#acknowledgements">ACKNOWLEDGEMENTS</A></LI>
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</UL>
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<!-- INDEX END -->
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<HR>
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<P>
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<H1><A NAME="name">NAME</A></H1>
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<P>Ora2Pg - Oracle to PostgreSQL database schema converter</P>
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<P>
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<HR>
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<H1><A NAME="synopsis">SYNOPSIS</A></H1>
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<PRE>
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BEGIN {
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$ENV{ORACLE_HOME} = '/usr/local/oracle/oracle816';
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}</PRE>
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<PRE>
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use strict;</PRE>
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<PRE>
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use Ora2Pg;</PRE>
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<PRE>
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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';</PRE>
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<PRE>
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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 => $dbpwd, # Database password
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{
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PrintError => 0,
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RaiseError => 1,
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AutoCommit => 0
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}
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);</PRE>
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<PRE>
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# Create the POSTGRESQL representation of all objects in the database
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$schema->export_schema("output.sql");</PRE>
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<PRE>
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exit(0);</PRE>
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<P>or if you only want to extract some tables:</P>
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<PRE>
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# Create an instance of the Ora2Pg perl module
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my @tables = ('tab1', 'tab2', 'tab3');
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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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tables => \@tables,
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or # Tables to extract
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tables => [('tab1','tab2')],
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debug => 1 # To show somethings when running
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);</PRE>
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<P>or if you only want to extract the 10 first tables:</P>
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<PRE>
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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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max => 10 # 10 first tables to extract
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);</PRE>
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<P>or if you only want to extract tables 10 to 20:</P>
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<PRE>
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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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min => 10, # Begin extraction at indice 10
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max => 20 # End extraction at indice 20
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);</PRE>
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<P>To choose a particular Oracle schema to export just set the following option
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to your schema name:</P>
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<PRE>
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schema => 'APPS'</PRE>
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<P>This schema definition can also be needed when you want to export data. If export
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failed and complain that the table doesn't exists use this to prefix the table name
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by the schema name.</P>
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<P>If you want to use PostgreSQL 7.3 schema support activate the init option
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'export_schema' set to 1. Default is no schema export</P>
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<P>To know at which indices tables can be found during extraction use the option:</P>
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<PRE>
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showtableid => 1</PRE>
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<P>To extract all views set the type option as follow:</P>
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<PRE>
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type => 'VIEW'</PRE>
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<P>To extract all grants set the type option as follow:</P>
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<PRE>
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type => 'GRANT'</PRE>
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<P>To extract all sequences set the type option as follow:</P>
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<PRE>
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type => 'SEQUENCE'</PRE>
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<P>To extract all triggers set the type option as follow:</P>
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<PRE>
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type => 'TRIGGER'</PRE>
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<P>To extract all functions set the type option as follow:</P>
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<PRE>
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type => 'FUNCTION'</PRE>
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<P>To extract all procedures set the type option as follow:</P>
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<PRE>
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type => 'PROCEDURE'</PRE>
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<P>To extract all packages and body set the type option as follow:</P>
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<PRE>
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type => 'PACKAGE'</PRE>
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<P>Default is table extraction</P>
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<PRE>
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type => 'TABLE'</PRE>
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<P>To extract all data from table extraction as INSERT statement use:</P>
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<PRE>
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type => 'DATA'</PRE>
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<P>To extract all data from table extraction as COPY statement use:</P>
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<PRE>
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type => 'COPY'</PRE>
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<P>and data_limit => n to specify the max tuples to return. If you set
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this options to 0 or nothing, no limitation are used. Additional option
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'table', 'min' and 'max' can also be used.</P>
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<P>When use of COPY or DATA you can export data by calling method:</P>
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<P>$schema->export_data(``output.sql'');</P>
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<P>Data are dumped to the given filename or to STDOUT with no argument.
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You can also send these data directly to a PostgreSQL backend using
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the following method:</P>
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<P>$schema->send_to_pgdb($destdatasrc,$destuser,$destpasswd);</P>
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<P>In this case you must call <CODE>export_data()</CODE> without argument after the
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call to method send_to_pgdb().</P>
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<P>If you set type to COPY and you want to dump data directly to a PG database,
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you must call method send_to_pgdb but data will not be sent via DBD::Pg but
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they will be load to the database using the psql command. Calling this method
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is istill required to be able to extract database name, hostname and port
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information. Edit the $PSQL variable to match the path of your psql
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command (nothing to edit if psql is in your path).</P>
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<P>
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<HR>
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<H1><A NAME="description">DESCRIPTION</A></H1>
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<P>Ora2Pg is a perl OO module used to export an Oracle database schema
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to a PostgreSQL compatible schema.</P>
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<P>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.</P>
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<P>I'm not a Oracle DBA so I don't really know something about its internal
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structure so you may find some incorrect things. Please tell me what is
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wrong and what can be better.</P>
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<P>It currently dump the database schema (tables, views, sequences, indexes, grants),
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with primary, unique and foreign keys into PostgreSQL syntax without editing the
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SQL code generated.</P>
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<P>It now can dump Oracle data into PostgreSQL DB as online process. You can choose
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what columns can be exported for each table.</P>
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<P>Functions, procedures and triggers PL/SQL code generated must be reviewed to match
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the PostgreSQL syntax. Some usefull recommandation on porting Oracle to PostgreSQL
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can be found at <A HREF="http://techdocs.postgresql.org/">http://techdocs.postgresql.org/</A> under the ``Converting from other
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Databases to PostgreSQL'' Oracle part. I just notice one thing more is that the
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<CODE>trunc()</CODE> function in Oracle is the same for number or date so be carefull when
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porting to PostgreSQL to use <CODE>trunc()</CODE> for number and <CODE>date_trunc()</CODE> for date.</P>
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<P>
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<HR>
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<H1><A NAME="abstract">ABSTRACT</A></H1>
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<P>The goal of the Ora2Pg perl module is to cover all part needed to export
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an Oracle database to a PostgreSQL database without other thing that provide
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the connection parameters to the Oracle database.</P>
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<P>Features must include:</P>
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<PRE>
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- Database schema export (tables, views, sequences, indexes),
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with unique, primary and foreign key.
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- Grants/privileges export by user and group.
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- Table selection (by name and max table) export.
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- Export Oracle schema to PostgreSQL 7.3 schema.
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- Predefined functions/triggers/procedures/packages export.
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- Data export.
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- Sql query converter (todo)</PRE>
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<P>My knowledge regarding database is really poor especially for Oracle
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so contribution is welcome.</P>
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<P>
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<HR>
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<H1><A NAME="requirement">REQUIREMENT</A></H1>
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<P>You just need the DBI, DBD::Pg and DBD::Oracle perl module to be installed</P>
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<P>
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<HR>
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<H1><A NAME="public methods">PUBLIC METHODS</A></H1>
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<P>
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<H2><A NAME="new hash_options">new HASH_OPTIONS</A></H2>
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<P>Creates a new Ora2Pg object.</P>
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<P>Supported options are:</P>
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<PRE>
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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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- schema : Oracle internal schema to extract
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- type : Type of data to extract, can be TABLE,VIEW,GRANT,SEQUENCE,
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TRIGGER,FUNCTION,PROCEDURE,DATA,COPY,PACKAGE
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- debug : Print the current state of the parsing
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- export_schema : Export Oracle schema to PostgreSQL 7.3 schema
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- tables : Extract only the given tables (arrayref)
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- showtableid : Display only the table indice during extraction
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- min : Indice to begin extraction. Default to 0
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- max : Indice to end extraction. Default to 0 mean no limits
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- data_limit : Number max of tuples to return during data extraction (default 0 no limit)</PRE>
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<P>Attempt that this list should grow a little more because all initialization is
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done by this way.</P>
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<P>
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<H2><A NAME="export_data filename">export_data FILENAME</A></H2>
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<P>Print SQL data output to a filename or
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to STDOUT if no file is given.</P>
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<P>Must be used only if type option is set to DATA or COPY
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=cut</P>
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<P>sub export_data
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{
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my ($self, $outfile) = @_;</P>
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<PRE>
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$self->_get_sql_data($outfile);
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}</PRE>
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<P>
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<H2><A NAME="export_sql filename">export_sql FILENAME</A></H2>
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<P>Print SQL conversion output to a filename or
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simply return these data if no file is given.</P>
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<P>
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<H2><A NAME="send_to_pgdb dest_datasrc dest_user dest_passwd">send_to_pgdb DEST_DATASRC DEST_USER DEST_PASSWD</A></H2>
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<P>Open a DB handle to a PostgreSQL database</P>
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<P>
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<H2><A NAME="modify_struct table_name arrayof_fieldname">modify_struct TABLE_NAME ARRAYOF_FIELDNAME</A></H2>
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<P>Modify a table structure during export. Only given fieldname
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will be exported.</P>
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<P>
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<HR>
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<H1><A NAME="private methods">PRIVATE METHODS</A></H1>
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<P>
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<H2><A NAME="_init hash_options">_init HASH_OPTIONS</A></H2>
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<P>Initialize a Ora2Pg object instance with a connexion to the
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Oracle database.</P>
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<P>
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<H2><A NAME="_grants">_grants</A></H2>
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<P>This function is used to retrieve all privilege information.</P>
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<P>It extract all Oracle's ROLES to convert them as Postgres groups
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and search all users associated to these roles.</P>
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<P>Set the main hash $self->{groups}.
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Set the main hash $self->{grantss}.</P>
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<P>
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<H2><A NAME="_sequences">_sequences</A></H2>
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<P>This function is used to retrieve all sequences information.</P>
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<P>Set the main hash $self->{sequences}.</P>
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<P>
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<H2><A NAME="_triggers">_triggers</A></H2>
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<P>This function is used to retrieve all triggers information.</P>
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<P>Set the main hash $self->{triggers}.</P>
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<P>
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<H2><A NAME="_functions">_functions</A></H2>
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<P>This function is used to retrieve all functions information.</P>
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<P>Set the main hash $self->{functions}.</P>
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<P>
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<H2><A NAME="_packages">_packages</A></H2>
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<P>This function is used to retrieve all packages information.</P>
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<P>Set the main hash $self->{packages}.</P>
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<P>
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<H2><A NAME="_tables">_tables</A></H2>
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<P>This function is used to retrieve all table information.</P>
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<P>Set the main hash of the database structure $self->{tables}.
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Keys are the names of all tables retrieved from the current
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database. Each table information compose an array associated
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to the table_info key as array reference. In other way:</P>
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<PRE>
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$self->{tables}{$class_name}{table_info} = [(OWNER,TYPE)];</PRE>
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<P>DBI TYPE can be TABLE, VIEW, SYSTEM TABLE, GLOBAL TEMPORARY, LOCAL TEMPORARY,
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ALIAS, SYNONYM or a data source specific type identifier. This only extract
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TABLE type.</P>
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<P>It also get the following informations in the DBI object to affect the
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main hash of the database structure :</P>
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<PRE>
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$self->{tables}{$class_name}{field_name} = $sth->{NAME};
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$self->{tables}{$class_name}{field_type} = $sth->{TYPE};</PRE>
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<P>It also call these other private subroutine to affect the main hash
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of the database structure :</P>
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<PRE>
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@{$self->{tables}{$class_name}{column_info}} = $self->_column_info($class_name, $owner);
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@{$self->{tables}{$class_name}{primary_key}} = $self->_primary_key($class_name, $owner);
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@{$self->{tables}{$class_name}{unique_key}} = $self->_unique_key($class_name, $owner);
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@{$self->{tables}{$class_name}{foreign_key}} = $self->_foreign_key($class_name, $owner);</PRE>
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<P>
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<H2><A NAME="_views">_views</A></H2>
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<P>This function is used to retrieve all views information.</P>
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<P>Set the main hash of the views definition $self->{views}.
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Keys are the names of all views retrieved from the current
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database values are the text definition of the views.</P>
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<P>It then set the main hash as follow:</P>
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<PRE>
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# Definition of the view
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$self->{views}{$table}{text} = $view_infos{$table};</PRE>
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<P>
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<H2><A NAME="_get_sql_data">_get_sql_data</A></H2>
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<P>Returns a string containing the entire SQL Schema definition compatible with PostgreSQL</P>
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<P>
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<H2><A NAME="_get_data table">_get_data TABLE</A></H2>
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<P>This function implements a Oracle-native data extraction.</P>
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<P>Return a list of array reference containing the data</P>
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<P>
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<H2><A NAME="_sql_type internal_type length precision scale">_sql_type INTERNAL_TYPE LENGTH PRECISION SCALE</A></H2>
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<P>This function return the PostgreSQL datatype corresponding to the
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Oracle internal type.</P>
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<P>
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<H2><A NAME="_column_info table owner">_column_info TABLE OWNER</A></H2>
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<P>This function implements a Oracle-native column information.</P>
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<P>Return a list of array reference containing the following informations
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for each column the given a table</P>
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<P>[(
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column name,
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column type,
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column length,
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nullable column,
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default value
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)]</P>
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<P>
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<H2><A NAME="_primary_key table owner">_primary_key TABLE OWNER</A></H2>
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<P>This function implements a Oracle-native primary key column
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information.</P>
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<P>Return a list of all column name defined as primary key
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for the given table.</P>
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<P>
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<H2><A NAME="_unique_key table owner">_unique_key TABLE OWNER</A></H2>
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<P>This function implements a Oracle-native unique key column
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information.</P>
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<P>Return a list of all column name defined as unique key
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for the given table.</P>
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<P>
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<H2><A NAME="_foreign_key table owner">_foreign_key TABLE OWNER</A></H2>
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<P>This function implements a Oracle-native foreign key reference
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information.</P>
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<P>Return a list of hash of hash of array reference. Ouuf! Nothing very difficult.
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The first hash is composed of all foreign key name. The second hash just have
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two key known as 'local' and remote' corresponding to the local table where the
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foreign key is defined and the remote table where the key refer.</P>
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<P>The foreign key name is composed as follow:</P>
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<PRE>
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'local_table_name->remote_table_name'</PRE>
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<P>Foreign key data consist in two array representing at the same indice the local
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field and the remote field where the first one refer to the second.
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Just like this:</P>
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<PRE>
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@{$link{$fkey_name}{local}} = @local_columns;
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@{$link{$fkey_name}{remote}} = @remote_columns;</PRE>
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<P>
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|
<H2><A NAME="_get_users">_get_users</A></H2>
|
|
<P>This function implements a Oracle-native users information.</P>
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|
<P>Return a hash of all users as an array.</P>
|
|
<P>
|
|
<H2><A NAME="_get_roles">_get_roles</A></H2>
|
|
<P>This function implements a Oracle-native roles
|
|
information.</P>
|
|
<P>Return a hash of all groups (roles) as an array of associated users.</P>
|
|
<P>
|
|
<H2><A NAME="_get_all_grants">_get_all_grants</A></H2>
|
|
<P>This function implements a Oracle-native user privilege
|
|
information.</P>
|
|
<P>Return a hash of all tables grants as an array of associated users.</P>
|
|
<P>
|
|
<H2><A NAME="_get_indexes table owner">_get_indexes TABLE OWNER</A></H2>
|
|
<P>This function implements a Oracle-native indexes information.</P>
|
|
<P>Return hash of array containing all unique index and a hash of
|
|
array of all indexes name which are not primary keys for the
|
|
given table.</P>
|
|
<P>
|
|
<H2><A NAME="_get_sequences">_get_sequences</A></H2>
|
|
<P>This function implements a Oracle-native sequences
|
|
information.</P>
|
|
<P>Return a hash of array of sequence name with MIN_VALUE, MAX_VALUE,
|
|
INCREMENT and LAST_NUMBER for the given table.</P>
|
|
<P>
|
|
<H2><A NAME="_get_views">_get_views</A></H2>
|
|
<P>This function implements a Oracle-native views information.</P>
|
|
<P>Return a hash of view name with the SQL query it is based on.</P>
|
|
<P>
|
|
<H2><A NAME="_alias_info">_alias_info</A></H2>
|
|
<P>This function implements a Oracle-native column information.</P>
|
|
<P>Return a list of array reference containing the following informations
|
|
for each alias of the given view</P>
|
|
<P>[(
|
|
column name,
|
|
column id
|
|
)]</P>
|
|
<P>
|
|
<H2><A NAME="_get_triggers">_get_triggers</A></H2>
|
|
<P>This function implements a Oracle-native triggers information.</P>
|
|
<P>Return an array of refarray of all triggers informations</P>
|
|
<P>
|
|
<H2><A NAME="_get_functions">_get_functions</A></H2>
|
|
<P>This function implements a Oracle-native functions information.</P>
|
|
<P>Return a hash of all function name with their PLSQL code</P>
|
|
<P>
|
|
<H2><A NAME="_get_packages">_get_packages</A></H2>
|
|
<P>This function implements a Oracle-native packages information.</P>
|
|
<P>Return a hash of all function name with their PLSQL code</P>
|
|
<P>
|
|
<H2><A NAME="_table_info">_table_info</A></H2>
|
|
<P>This function retrieve all Oracle-native tables information.</P>
|
|
<P>Return a handle to a DB query statement</P>
|
|
<P>
|
|
<HR>
|
|
<H1><A NAME="author">AUTHOR</A></H1>
|
|
<P>Gilles Darold <<A HREF="mailto:gilles@darold.net">gilles@darold.net</A>></P>
|
|
<P>
|
|
<HR>
|
|
<H1><A NAME="copyright">COPYRIGHT</A></H1>
|
|
<P>Copyright (c) 2001 Gilles Darold - All rights reserved.</P>
|
|
<P>This program is free software; you can redistribute it and/or modify it under
|
|
the same terms as Perl itself.</P>
|
|
<P>
|
|
<HR>
|
|
<H1><A NAME="bugs">BUGS</A></H1>
|
|
<P>This perl module is in the same state as my knowledge regarding database,
|
|
it can move and not be compatible with older version so I will do my best
|
|
to give you official support for Ora2Pg. Your volontee to help construct
|
|
it and your contribution are welcome.</P>
|
|
<P>
|
|
<HR>
|
|
<H1><A NAME="see also">SEE ALSO</A></H1>
|
|
<P><EM>DBI</EM>, <A HREF="/DBD/Oracle.html">the DBD::Oracle manpage</A>, <A HREF="/DBD/Pg.html">the DBD::Pg manpage</A></P>
|
|
<P>
|
|
<HR>
|
|
<H1><A NAME="acknowledgements">ACKNOWLEDGEMENTS</A></H1>
|
|
<P>Thanks to Jason Servetar who decided me to implement data extraction.</P>
|
|
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|
</BODY>
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</HTML>
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