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# -*- Mode: perl; indent-tabs-mode: nil -*-
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# The Initial Developer of the Original Code is Oracle Corporation.
# Portions created by Oracle are Copyright (C) 2007 Oracle Corporation.
# All Rights Reserved.
#
# Contributor(s): Lance Larsh <lance.larsh@oracle.com>
# Xiaoou Wu <xiaoou.wu@oracle.com>
# Max Kanat-Alexander <mkanat@bugzilla.org>
package Bugzilla::DB::Schema::Oracle;
###############################################################################
#
# DB::Schema implementation for Oracle
#
###############################################################################
use strict;
use base qw(Bugzilla::DB::Schema);
use Carp qw(confess);
use Digest::MD5 qw(md5_hex);
use Bugzilla::Util;
use constant ADD_COLUMN => 'ADD';
#------------------------------------------------------------------------------
sub _initialize {
my $self = shift;
$self = $self->SUPER::_initialize(@_);
$self->{db_specific} = {
BOOLEAN => 'integer',
FALSE => '0',
TRUE => '1',
INT1 => 'integer',
INT2 => 'integer',
INT3 => 'integer',
INT4 => 'integer',
SMALLSERIAL => 'integer',
MEDIUMSERIAL => 'integer',
INTSERIAL => 'integer',
TINYTEXT => 'varchar(255)',
MEDIUMTEXT => 'varchar(4000)',
LONGTEXT => 'clob',
LONGBLOB => 'blob',
DATETIME => 'date',
};
$self->_adjust_schema;
return $self;
} #eosub--_initialize
#--------------------------------------------------------------------
sub get_table_ddl {
my $self = shift;
my $table = shift;
unshift @_, $table;
my @ddl = $self->SUPER::get_table_ddl(@_);
my @fields = @{ $self->{abstract_schema}{$table}{FIELDS} || [] };
while (@fields) {
my $field_name = shift @fields;
my $field_info = shift @fields;
# Create triggers to deal with empty string.
if ( $field_info->{TYPE} =~ /varchar|TEXT/i
&& $field_info->{NOTNULL} ) {
push (@ddl, _get_notnull_trigger_ddl($table, $field_name));
}
# Create sequences and triggers to emulate SERIAL datatypes.
if ( $field_info->{TYPE} =~ /SERIAL/i ) {
push (@ddl, $self->_get_create_seq_ddl($table, $field_name));
}
}
return @ddl;
} #eosub--get_table_ddl
# Extend superclass method to create Oracle Text indexes if index type
# is FULLTEXT from schema. Returns a "create index" SQL statement.
sub _get_create_index_ddl {
my ($self, $table_name, $index_name, $index_fields, $index_type) = @_;
$index_name = "idx_" . substr(md5_hex($index_name),0,20);
if ($index_type eq 'FULLTEXT') {
my $sql = "CREATE INDEX $index_name ON $table_name ("
. join(',',@$index_fields)
. ") INDEXTYPE IS CTXSYS.CONTEXT "
. " PARAMETERS('LEXER BZ_LEX SYNC(ON COMMIT)')" ;
return $sql;
}
return($self->SUPER::_get_create_index_ddl($table_name, $index_name,
$index_fields, $index_type));
} #eosub--_get_create_index_ddl
# Oracle supports the use of FOREIGN KEY integrity constraints
# to define the referential integrity actions, including:
# - Update and delete No Action (default)
# - Delete CASCADE
# - Delete SET NULL
sub get_fk_ddl {
my ($self, $table, $column, $references) = @_;
return "" if !$references;
my $update = $references->{UPDATE} || 'CASCADE';
my $delete = $references->{DELETE};
my $to_table = $references->{TABLE} || confess "No table in reference";
my $to_column = $references->{COLUMN} || confess "No column in reference";
my $fk_name = $self->_get_fk_name($table, $column, $references);
my $fk_string = "\n CONSTRAINT $fk_name FOREIGN KEY ($column)\n"
. " REFERENCES $to_table($to_column)\n";
$fk_string = $fk_string . " ON DELETE $delete" if $delete;
if ( $update =~ /CASCADE/i ){
my $tr_str = "CREATE OR REPLACE TRIGGER ${fk_name}_UC"
. " AFTER UPDATE ON ". $table
. " REFERENCING "
. " NEW AS NEW "
. " OLD AS OLD "
. " FOR EACH ROW "
. " BEGIN "
. " UPDATE $to_table"
. " SET $to_column = :NEW.$column"
. " WHERE $to_column = :OLD.$column;"
. " END ${fk_name}_UC;";
my $dbh = Bugzilla->dbh;
$dbh->do($tr_str);
}
return $fk_string;
}
sub get_drop_fk_sql {
my $self = shift;
my ($table, $column, $references) = @_;
my $fk_name = $self->_get_fk_name(@_);
my @sql;
if (!$references->{UPDATE} || $references->{UPDATE} =~ /CASCADE/i) {
push(@sql, "DROP TRIGGER ${fk_name}_uc");
}
push(@sql, $self->SUPER::get_drop_fk_sql(@_));
return @sql;
}
sub _get_fk_name {
my ($self, $table, $column, $references) = @_;
my $to_table = $references->{TABLE};
my $to_column = $references->{COLUMN};
my $fk_name = "${table}_${column}_${to_table}_${to_column}";
$fk_name = "fk_" . substr(md5_hex($fk_name),0,20);
return $fk_name;
}
sub _get_notnull_trigger_ddl {
my ($table, $column) = @_;
my $notnull_sql = "CREATE OR REPLACE TRIGGER "
. " ${table}_${column}"
. " BEFORE INSERT OR UPDATE ON ". $table
. " FOR EACH ROW"
. " BEGIN "
. " IF :NEW.". $column ." IS NULL THEN "
. " SELECT '" . Bugzilla::DB::Oracle->EMPTY_STRING
. "' INTO :NEW.". $column ." FROM DUAL; "
. " END IF; "
. " END ".$table.";";
return $notnull_sql;
}
sub _get_create_seq_ddl {
my ($self, $table, $column, $start_with) = @_;
$start_with ||= 1;
my @ddl;
my $seq_name = "${table}_${column}_SEQ";
my $seq_sql = "CREATE SEQUENCE $seq_name "
. " INCREMENT BY 1 "
. " START WITH $start_with "
. " NOMAXVALUE "
. " NOCYCLE "
. " NOCACHE";
my $serial_sql = "CREATE OR REPLACE TRIGGER ${table}_${column}_TR "
. " BEFORE INSERT ON ${table} "
. " FOR EACH ROW "
. " BEGIN "
. " SELECT ${seq_name}.NEXTVAL "
. " INTO :NEW.${column} FROM DUAL; "
. " END;";
push (@ddl, $seq_sql);
push (@ddl, $serial_sql);
return @ddl;
}
1;
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