432 lines
15 KiB
Perl
432 lines
15 KiB
Perl
# -*- Mode: perl; indent-tabs-mode: nil -*-
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#
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# The contents of this file are subject to the Mozilla Public
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# License Version 1.1 (the "License"); you may not use this file
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# except in compliance with the License. You may obtain a copy of
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# the License at http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS
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# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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# implied. See the License for the specific language governing
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# rights and limitations under the License.
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#
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# The Original Code is the Bugzilla Bug Tracking System.
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#
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# The Initial Developer of the Original Code is Oracle Corporation.
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# Portions created by Oracle are Copyright (C) 2007 Oracle Corporation.
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# All Rights Reserved.
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#
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# Contributor(s): Lance Larsh <lance.larsh@oracle.com>
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# Xiaoou Wu <xiaoou.wu@oracle.com>
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# Max Kanat-Alexander <mkanat@bugzilla.org>
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package Bugzilla::DB::Schema::Oracle;
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###############################################################################
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#
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# DB::Schema implementation for Oracle
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#
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###############################################################################
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use strict;
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use base qw(Bugzilla::DB::Schema);
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use Carp qw(confess);
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use Bugzilla::Util;
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use constant ADD_COLUMN => 'ADD';
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# Whether this is true or not, this is what it needs to be in order for
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# hash_identifier to maintain backwards compatibility with versions before
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# 3.2rc2.
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use constant MAX_IDENTIFIER_LEN => 27;
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#------------------------------------------------------------------------------
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sub _initialize {
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my $self = shift;
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$self = $self->SUPER::_initialize(@_);
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$self->{db_specific} = {
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BOOLEAN => 'integer',
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FALSE => '0',
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TRUE => '1',
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INT1 => 'integer',
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INT2 => 'integer',
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INT3 => 'integer',
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INT4 => 'integer',
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SMALLSERIAL => 'integer',
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MEDIUMSERIAL => 'integer',
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INTSERIAL => 'integer',
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TINYTEXT => 'varchar(255)',
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MEDIUMTEXT => 'varchar(4000)',
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LONGTEXT => 'clob',
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LONGBLOB => 'blob',
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DATETIME => 'date',
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};
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$self->_adjust_schema;
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return $self;
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} #eosub--_initialize
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#--------------------------------------------------------------------
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sub get_table_ddl {
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my $self = shift;
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my $table = shift;
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unshift @_, $table;
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my @ddl = $self->SUPER::get_table_ddl(@_);
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my @fields = @{ $self->{abstract_schema}{$table}{FIELDS} || [] };
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while (@fields) {
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my $field_name = shift @fields;
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my $field_info = shift @fields;
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# Create triggers to deal with empty string.
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if ( $field_info->{TYPE} =~ /varchar|TEXT/i
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&& $field_info->{NOTNULL} ) {
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push (@ddl, _get_notnull_trigger_ddl($table, $field_name));
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}
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# Create sequences and triggers to emulate SERIAL datatypes.
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if ( $field_info->{TYPE} =~ /SERIAL/i ) {
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push (@ddl, $self->_get_create_seq_ddl($table, $field_name));
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}
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}
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return @ddl;
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} #eosub--get_table_ddl
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# Extend superclass method to create Oracle Text indexes if index type
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# is FULLTEXT from schema. Returns a "create index" SQL statement.
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sub _get_create_index_ddl {
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my ($self, $table_name, $index_name, $index_fields, $index_type) = @_;
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$index_name = "idx_" . $self->_hash_identifier($index_name);
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if ($index_type eq 'FULLTEXT') {
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my $sql = "CREATE INDEX $index_name ON $table_name ("
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. join(',',@$index_fields)
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. ") INDEXTYPE IS CTXSYS.CONTEXT "
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. " PARAMETERS('LEXER BZ_LEX SYNC(ON COMMIT)')" ;
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return $sql;
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}
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return($self->SUPER::_get_create_index_ddl($table_name, $index_name,
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$index_fields, $index_type));
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}
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sub get_drop_index_ddl {
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my $self = shift;
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my ($table, $name) = @_;
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$name = 'idx_' . $self->_hash_identifier($name);
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return $self->SUPER::get_drop_index_ddl($table, $name);
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}
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# Oracle supports the use of FOREIGN KEY integrity constraints
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# to define the referential integrity actions, including:
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# - Update and delete No Action (default)
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# - Delete CASCADE
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# - Delete SET NULL
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sub get_fk_ddl {
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my ($self, $table, $column, $references) = @_;
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return "" if !$references;
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my $update = $references->{UPDATE} || 'CASCADE';
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my $delete = $references->{DELETE};
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my $to_table = $references->{TABLE} || confess "No table in reference";
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my $to_column = $references->{COLUMN} || confess "No column in reference";
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my $fk_name = $self->_get_fk_name($table, $column, $references);
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# 'ON DELETE RESTRICT' is enabled by default
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$delete = "" if ( defined $delete && $delete =~ /RESTRICT/i);
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my $fk_string = "\n CONSTRAINT $fk_name FOREIGN KEY ($column)\n"
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. " REFERENCES $to_table($to_column)\n";
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$fk_string = $fk_string . " ON DELETE $delete" if $delete;
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if ( $update =~ /CASCADE/i ){
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my $tr_str = "CREATE OR REPLACE TRIGGER ${fk_name}_UC"
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. " AFTER UPDATE OF $to_column ON $to_table "
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. " REFERENCING "
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. " NEW AS NEW "
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. " OLD AS OLD "
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. " FOR EACH ROW "
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. " BEGIN "
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. " UPDATE $table"
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. " SET $column = :NEW.$to_column"
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. " WHERE $column = :OLD.$to_column;"
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. " END ${fk_name}_UC;";
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my $dbh = Bugzilla->dbh;
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$dbh->do($tr_str);
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}
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return $fk_string;
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}
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sub get_drop_fk_sql {
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my $self = shift;
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my ($table, $column, $references) = @_;
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my $fk_name = $self->_get_fk_name(@_);
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my @sql;
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if (!$references->{UPDATE} || $references->{UPDATE} =~ /CASCADE/i) {
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push(@sql, "DROP TRIGGER ${fk_name}_uc");
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}
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push(@sql, $self->SUPER::get_drop_fk_sql(@_));
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return @sql;
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}
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sub _get_fk_name {
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my ($self, $table, $column, $references) = @_;
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my $to_table = $references->{TABLE};
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my $to_column = $references->{COLUMN};
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my $fk_name = "${table}_${column}_${to_table}_${to_column}";
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$fk_name = "fk_" . $self->_hash_identifier($fk_name);
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return $fk_name;
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}
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sub get_alter_column_ddl {
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my ($self, $table, $column, $new_def, $set_nulls_to) = @_;
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my @statements;
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my $old_def = $self->get_column_abstract($table, $column);
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my $specific = $self->{db_specific};
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# If the types have changed, we have to deal with that.
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if (uc(trim($old_def->{TYPE})) ne uc(trim($new_def->{TYPE}))) {
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push(@statements, $self->_get_alter_type_sql($table, $column,
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$new_def, $old_def));
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}
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my $default = $new_def->{DEFAULT};
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my $default_old = $old_def->{DEFAULT};
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# This first condition prevents "uninitialized value" errors.
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if (!defined $default && !defined $default_old) {
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# Do Nothing
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}
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# If we went from having a default to not having one
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elsif (!defined $default && defined $default_old) {
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push(@statements, "ALTER TABLE $table MODIFY $column"
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. " DEFAULT NULL");
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}
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# If we went from no default to a default, or we changed the default.
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elsif ( (defined $default && !defined $default_old) ||
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($default ne $default_old) )
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{
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$default = $specific->{$default} if exists $specific->{$default};
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push(@statements, "ALTER TABLE $table MODIFY $column "
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. " DEFAULT $default");
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}
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# If we went from NULL to NOT NULL.
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if (!$old_def->{NOTNULL} && $new_def->{NOTNULL}) {
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my $setdefault;
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# Handle any fields that were NULL before, if we have a default,
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$setdefault = $new_def->{DEFAULT} if exists $new_def->{DEFAULT};
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# But if we have a set_nulls_to, that overrides the DEFAULT
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# (although nobody would usually specify both a default and
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# a set_nulls_to.)
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$setdefault = $set_nulls_to if defined $set_nulls_to;
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if (defined $setdefault) {
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push(@statements, "UPDATE $table SET $column = $setdefault"
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. " WHERE $column IS NULL");
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}
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push(@statements, "ALTER TABLE $table MODIFY $column"
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. " NOT NULL");
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push (@statements, _get_notnull_trigger_ddl($table, $column))
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if $old_def->{TYPE} =~ /varchar|text/i
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&& $new_def->{TYPE} =~ /varchar|text/i;
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}
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# If we went from NOT NULL to NULL
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elsif ($old_def->{NOTNULL} && !$new_def->{NOTNULL}) {
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push(@statements, "ALTER TABLE $table MODIFY $column"
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. " NULL");
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push(@statements, "DROP TRIGGER ${table}_${column}")
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if $new_def->{TYPE} =~ /varchar|text/i
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&& $old_def->{TYPE} =~ /varchar|text/i;
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}
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# If we went from not being a PRIMARY KEY to being a PRIMARY KEY.
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if (!$old_def->{PRIMARYKEY} && $new_def->{PRIMARYKEY}) {
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push(@statements, "ALTER TABLE $table ADD PRIMARY KEY ($column)");
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}
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# If we went from being a PK to not being a PK
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elsif ( $old_def->{PRIMARYKEY} && !$new_def->{PRIMARYKEY} ) {
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push(@statements, "ALTER TABLE $table DROP PRIMARY KEY");
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}
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return @statements;
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}
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sub _get_alter_type_sql {
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my ($self, $table, $column, $new_def, $old_def) = @_;
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my @statements;
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my $type = $new_def->{TYPE};
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$type = $self->{db_specific}->{$type}
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if exists $self->{db_specific}->{$type};
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if ($type =~ /serial/i && $old_def->{TYPE} !~ /serial/i) {
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die("You cannot specify a DEFAULT on a SERIAL-type column.")
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if $new_def->{DEFAULT};
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}
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if ( ($old_def->{TYPE} =~ /LONGTEXT/i && $new_def->{TYPE} !~ /LONGTEXT/i)
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|| ($old_def->{TYPE} !~ /LONGTEXT/i && $new_def->{TYPE} =~ /LONGTEXT/i)
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) {
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# LONG to VARCHAR or VARCHAR to LONG is not allowed in Oracle,
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# just a way to work around.
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# Determine whether column_temp is already exist.
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my $dbh=Bugzilla->dbh;
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my $column_exist = $dbh->selectcol_arrayref(
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"SELECT CNAME FROM COL WHERE TNAME = UPPER(?) AND
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CNAME = UPPER(?)", undef,$table,$column . "_temp");
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if(!@$column_exist) {
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push(@statements,
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"ALTER TABLE $table ADD ${column}_temp $type");
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}
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push(@statements, "UPDATE $table SET ${column}_temp = $column");
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push(@statements, "COMMIT");
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push(@statements, "ALTER TABLE $table DROP COLUMN $column");
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push(@statements,
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"ALTER TABLE $table RENAME COLUMN ${column}_temp TO $column");
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} else {
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push(@statements, "ALTER TABLE $table MODIFY $column $type");
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}
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if ($new_def->{TYPE} =~ /serial/i && $old_def->{TYPE} !~ /serial/i) {
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push(@statements, _get_create_seq_ddl($table, $column));
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}
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# If this column is no longer SERIAL, we need to drop the sequence
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# that went along with it.
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if ($old_def->{TYPE} =~ /serial/i && $new_def->{TYPE} !~ /serial/i) {
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push(@statements, "DROP SEQUENCE ${table}_${column}_SEQ");
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push(@statements, "DROP TRIGGER ${table}_${column}_TR");
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}
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# If this column is changed to type TEXT/VARCHAR, we need to deal with
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# empty string.
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if ( $old_def->{TYPE} !~ /varchar|text/i
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&& $new_def->{TYPE} =~ /varchar|text/i
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&& $new_def->{NOTNULL} )
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{
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push (@statements, _get_notnull_trigger_ddl($table, $column));
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}
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# If this column is no longer TEXT/VARCHAR, we need to drop the trigger
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# that went along with it.
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if ( $old_def->{TYPE} =~ /varchar|text/i
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&& $old_def->{NOTNULL}
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&& $new_def->{TYPE} !~ /varchar|text/i )
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{
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push(@statements, "DROP TRIGGER ${table}_${column}");
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}
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return @statements;
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}
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sub get_rename_column_ddl {
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my ($self, $table, $old_name, $new_name) = @_;
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if (lc($old_name) eq lc($new_name)) {
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# if the only change is a case change, return an empty list.
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return ();
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}
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my @sql = ("ALTER TABLE $table RENAME COLUMN $old_name TO $new_name");
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my $def = $self->get_column_abstract($table, $old_name);
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if ($def->{TYPE} =~ /SERIAL/i) {
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# We have to rename the series also, and fix the default of the series.
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push(@sql, "RENAME ${table}_${old_name}_SEQ TO
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${table}_${new_name}_seq");
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my $serial_sql =
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"CREATE OR REPLACE TRIGGER ${table}_${new_name}_TR "
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. " BEFORE INSERT ON ${table} "
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. " FOR EACH ROW "
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. " BEGIN "
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. " SELECT ${table}_${new_name}_SEQ.NEXTVAL "
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. " INTO :NEW.${new_name} FROM DUAL; "
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. " END;";
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push(@sql, $serial_sql);
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push(@sql, "DROP TRIGGER ${table}_${old_name}_TR");
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}
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if ($def->{TYPE} =~ /varchar|text/i && $def->{NOTNULL} ) {
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push(@sql, _get_notnull_trigger_ddl($table,$new_name));
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push(@sql, "DROP TRIGGER ${table}_${old_name}");
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}
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return @sql;
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}
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sub _get_notnull_trigger_ddl {
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my ($table, $column) = @_;
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my $notnull_sql = "CREATE OR REPLACE TRIGGER "
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. " ${table}_${column}"
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. " BEFORE INSERT OR UPDATE ON ". $table
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. " FOR EACH ROW"
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. " BEGIN "
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. " IF :NEW.". $column ." IS NULL THEN "
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. " SELECT '" . Bugzilla::DB::Oracle->EMPTY_STRING
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. "' INTO :NEW.". $column ." FROM DUAL; "
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. " END IF; "
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. " END ".$table.";";
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return $notnull_sql;
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}
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sub _get_create_seq_ddl {
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my ($self, $table, $column, $start_with) = @_;
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$start_with ||= 1;
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my @ddl;
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my $seq_name = "${table}_${column}_SEQ";
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my $seq_sql = "CREATE SEQUENCE $seq_name "
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. " INCREMENT BY 1 "
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. " START WITH $start_with "
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. " NOMAXVALUE "
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. " NOCYCLE "
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. " NOCACHE";
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my $serial_sql = "CREATE OR REPLACE TRIGGER ${table}_${column}_TR "
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. " BEFORE INSERT ON ${table} "
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. " FOR EACH ROW "
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. " BEGIN "
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. " SELECT ${seq_name}.NEXTVAL "
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. " INTO :NEW.${column} FROM DUAL; "
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. " END;";
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push (@ddl, $seq_sql);
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push (@ddl, $serial_sql);
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return @ddl;
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}
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sub get_set_serial_sql {
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my ($self, $table, $column, $value) = @_;
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my @sql;
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my $seq_name = "${table}_${column}_SEQ";
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push(@sql, "DROP SEQUENCE ${seq_name}");
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push(@sql, $self->_get_create_seq_ddl($table, $column, $value));
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return @sql;
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}
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sub get_drop_column_ddl {
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my $self = shift;
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my ($table, $column) = @_;
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my @sql;
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push(@sql, $self->SUPER::get_drop_column_ddl(@_));
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my $dbh=Bugzilla->dbh;
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my $trigger_name = uc($table . "_" . $column);
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my $exist_trigger = $dbh->selectcol_arrayref(
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"SELECT OBJECT_NAME FROM USER_OBJECTS
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WHERE OBJECT_NAME = ?", undef, $trigger_name);
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if(@$exist_trigger) {
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push(@sql, "DROP TRIGGER $trigger_name");
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}
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return @sql;
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}
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1;
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