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dpavlin |
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#!/usr/bin/perl -w |
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# |
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# This script will convert (on-the-fly) content of your MySQL libdata |
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# database to PostgreSQL. It's mostly useful if you do migration from |
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# MySQL to PostgreSQL or development of PostgreSQL version. |
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# |
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# 2003-03-05 Dobrica Pavlinusic <dpavlin@rot13.org> |
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# |
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# TODO: convert session data |
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use DBI; |
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use strict; |
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use Getopt::Long; |
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my $mydsn = "DBI:mysql:database=libdata;host=localhost"; |
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my $mydbh = DBI->connect($mydsn, 'root', '', {'RaiseError' => 1}); |
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my $pgdsn = "DBI:Pg:dbname=libdata"; |
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my $pgdbh = DBI->connect($pgdsn, 'dpavlin', '', {'RaiseError' => 1}); |
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$pgdbh->begin_work; |
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# fix pagetitle_style which is reset to 0 instead of null |
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$mydbh->do("update page set pagetitle_style = null where pagetitle_style = 0"); |
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# fix substats which aren't referenced any more |
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# this sucks, bug MySQL doesn't have sub-selects |
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my @sub_ids; |
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my $mysth = $mydbh->prepare("SELECT subject_id FROM subject"); |
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$mysth->execute(); |
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while (my ($id) = $mysth->fetchrow_array()) { |
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push @sub_ids,$id; |
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} |
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$mydbh->do("delete from libstats.substats where subject_id not in (".join(",",@sub_ids).")"); |
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# you might need to add more fixes like this if your database |
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# is more broken than mine. |
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# order of table is important to preserve referential integrity! |
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my @tables = qw(access campus coursesub term style pagetype page course |
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stafftitle staff faculty course_personnel service servicetype location |
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dpavlin |
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subject mastersubject masterinfotype infotype vendor resource element feature libunit |
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dpavlin |
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libunit_staff page_staff pastebuffer res_feature res_loc |
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dpavlin |
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res_mastersubject res_sub_infotype serv_loc serv_servtype sub_coursesub |
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sub_loc sub_mastersubject sub_othersub sub_page sub_staff |
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libstats.elementstats libstats.pagestats libstats.substats); |
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foreach my $table (@tables) { |
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print "working on '$table'\n"; |
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$pgdbh->do("delete from $table"); |
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my $mysth = $mydbh->prepare("select * from $table"); |
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$mysth->execute(); |
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my $pgsth; |
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while (my @row = $mysth->fetchrow_array()) { |
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# prepare insert statement if it doesn't exist! |
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if (! $pgsth) { |
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my $sql = "insert into $table values ("; |
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$sql .= "?," x scalar @row; |
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$sql =~ s/,$//; |
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$sql .= ")"; |
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$pgsth = $pgdbh->prepare($sql); |
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} |
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$pgsth->execute(@row); |
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} |
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$mysth->finish(); |
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$pgsth->finish() if ($pgsth); |
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} |
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# fix sequences |
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my @sequences = qw(access_access_id_seq campus_campus_id_seq |
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coursesub_coursesub_id_seq term_term_id_seq style_style_id_seq |
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pagetype_pagetype_id_seq page_page_id_seq course_course_id_seq |
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stafftitle_stafftitle_id_seq staff_staff_id_seq faculty_faculty_id_seq |
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course_personnel_personnel_id_seq service_service_id_seq |
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servicetype_servicetype_id_seq location_location_id_seq subject_subject_id_seq |
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mastersubject_mastersubject_id_seq infotype_infotype_id_seq |
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resource_resource_id_seq element_element_id_seq feature_feature_id_seq |
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libunit_libunit_id_seq masterinfotype_masterinfotype_id_seq |
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pastebuffer_pastebuffer_id_seq libstats.elementstats_elementstats_id_seq |
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libstats.pagestats_pagestats_id_seq libstats.substats_substats_id_seq |
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session_key_id_seq); |
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foreach my $seq (@sequences) { |
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print "working on '$seq'\n"; |
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my $col; |
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my $table; |
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if ($seq =~ m/^([\w\.]+)_(\w+_id)_seq$/) { |
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($table,$col) = ($1,$2); |
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} else { |
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die "can't decode sequence $seq into table name and column!"; |
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} |
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# maximum sequence name for PostgreSQL is 28 chars |
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my $seq = substr($seq,0,28 + index($seq,'.') + 1); |
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my $sql = "select setval('$seq',(select case when max($col)>0 then max($col)+1 else 1 end from $table))"; |
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$pgdbh->do("select setval('$seq',(select case when max($col)>0 then max($col)+1 else 1 end from $table))"); |
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} |
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# reset all passwords to libdata |
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$pgdbh->do("update staff set password=md5('libdata') where staff_id > 1"); |
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$pgdbh->commit; |
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$mydbh->disconnect(); |
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$pgdbh->disconnect(); |
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