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718 lines
24 KiB
PHP
718 lines
24 KiB
PHP
<?php
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///////////////////////////////////////////////////////////////////////////
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// //
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// NOTICE OF COPYRIGHT //
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// //
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// Moodle - Modular Object-Oriented Dynamic Learning Environment //
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// http://moodle.com //
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// //
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// Copyright (C) 1999 onwards Martin Dougiamas http://dougiamas.com //
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// (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation; either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details: //
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// //
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// http://www.gnu.org/copyleft/gpl.html //
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// //
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///////////////////////////////////////////////////////////////////////////
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/// This class represent one XMLDB structure
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class xmldb_structure extends xmldb_object {
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var $path;
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var $version;
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var $tables;
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var $statements;
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/**
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* Creates one new xmldb_structure
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*/
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function __construct($name) {
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parent::__construct($name);
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$this->path = NULL;
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$this->version = NULL;
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$this->tables = array();
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$this->statements = array();
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}
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/**
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* Returns the path of the structure
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*/
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function getPath() {
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return $this->path;
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}
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/**
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* Returns the version of the structure
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*/
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function getVersion() {
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return $this->version;
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}
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/**
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* Returns one xmldb_table
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*/
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function &getTable($tablename) {
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$i = $this->findTableInArray($tablename);
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if ($i !== NULL) {
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return $this->tables[$i];
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}
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$null = NULL;
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return $null;
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}
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/**
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* Returns the position of one table in the array.
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*/
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function &findTableInArray($tablename) {
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foreach ($this->tables as $i => $table) {
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if ($tablename == $table->getName()) {
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return $i;
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}
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}
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$null = NULL;
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return $null;
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}
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/**
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* Returns the position of one statement in the array.
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*/
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function &findStatementInArray($statementname) {
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foreach ($this->statements as $i => $statement) {
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if ($statementname == $statement->getName()) {
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return $i;
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}
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}
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$null = NULL;
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return $null;
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}
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/**
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* This function will reorder the array of tables
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*/
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function orderTables() {
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$result = $this->orderElements($this->tables);
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if ($result) {
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$this->setTables($result);
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return true;
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} else {
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return false;
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}
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}
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/**
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* This function will reorder the array of statements
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*/
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function orderStatements() {
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$result = $this->orderElements($this->statements);
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if ($result) {
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$this->setStatements($result);
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return true;
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} else {
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return false;
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}
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}
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/**
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* Returns the tables of the structure
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*/
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function &getTables() {
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return $this->tables;
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}
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/**
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* Returns one xmldb_statement
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*/
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function &getStatement($statementname) {
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$i = $this->findStatementInArray($statementname);
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if ($i !== NULL) {
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return $this->statements[$i];
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}
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$null = NULL;
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return $null;
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}
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/**
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* Returns the statements of the structure
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*/
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function &getStatements() {
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return $this->statements;
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}
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/**
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* Set the structure version
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*/
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function setVersion($version) {
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$this->version = $version;
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}
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/**
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* Add one table to the structure, allowing to specify the desired order
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* If it's not specified, then the table is added at the end.
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*/
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function addTable(&$table, $after=NULL) {
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/// Calculate the previous and next tables
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$prevtable = NULL;
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$nexttable = NULL;
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if (!$after) {
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$alltables =& $this->getTables();
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if ($alltables) {
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end($alltables);
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$prevtable =& $alltables[key($alltables)];
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}
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} else {
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$prevtable =& $this->getTable($after);
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}
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if ($prevtable && $prevtable->getNext()) {
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$nexttable =& $this->getTable($prevtable->getNext());
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}
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/// Set current table previous and next attributes
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if ($prevtable) {
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$table->setPrevious($prevtable->getName());
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$prevtable->setNext($table->getName());
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}
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if ($nexttable) {
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$table->setNext($nexttable->getName());
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$nexttable->setPrevious($table->getName());
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}
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/// Some more attributes
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$table->setLoaded(true);
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$table->setChanged(true);
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/// Add the new table
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$this->tables[] =& $table;
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/// Reorder the whole structure
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$this->orderTables($this->tables);
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/// Recalculate the hash
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$this->calculateHash(true);
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/// We have one new table, so the structure has changed
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$this->setVersion(userdate(time(), '%Y%m%d', 99, false));
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$this->setChanged(true);
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}
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/**
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* Add one statement to the structure, allowing to specify the desired order
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* If it's not specified, then the statement is added at the end.
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*/
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function addStatement(&$statement, $after=NULL) {
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/// Calculate the previous and next tables
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$prevstatement = NULL;
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$nextstatement = NULL;
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if (!$after) {
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$allstatements =& $this->getStatements();
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if ($allstatements) {
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end($allstatements);
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$prevstatement =& $allstatements[key($allstatements)];
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}
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} else {
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$prevstatement =& $this->getStatement($after);
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}
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if ($prevstatement && $prevstatement->getNext()) {
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$nextstatement =& $this->getStatement($prevstatement->getNext());
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}
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/// Set current statement previous and next attributes
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if ($prevstatement) {
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$statement->setPrevious($prevstatement->getName());
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$prevstatement->setNext($statement->getName());
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}
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if ($nextstatement) {
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$statement->setNext($nextstatement->getName());
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$nextstatement->setPrevious($statement->getName());
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}
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/// Some more attributes
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$statement->setLoaded(true);
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$statement->setChanged(true);
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/// Add the new statement
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$this->statements[] =& $statement;
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/// Reorder the whole structure
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$this->orderStatements($this->statements);
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/// Recalculate the hash
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$this->calculateHash(true);
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/// We have one new statement, so the structure has changed
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$this->setVersion(userdate(time(), '%Y%m%d', 99, false));
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$this->setChanged(true);
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}
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/**
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* Delete one table from the Structure
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*/
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function deleteTable($tablename) {
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$table =& $this->getTable($tablename);
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if ($table) {
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$i = $this->findTableInArray($tablename);
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$prevtable = NULL;
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$nexttable = NULL;
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/// Look for prev and next table
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$prevtable =& $this->getTable($table->getPrevious());
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$nexttable =& $this->getTable($table->getNext());
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/// Change their previous and next attributes
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if ($prevtable) {
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$prevtable->setNext($table->getNext());
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}
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if ($nexttable) {
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$nexttable->setPrevious($table->getPrevious());
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}
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/// Delete the table
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unset($this->tables[$i]);
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/// Reorder the tables
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$this->orderTables($this->tables);
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/// Recalculate the hash
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$this->calculateHash(true);
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/// We have one deleted table, so the structure has changed
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$this->setVersion(userdate(time(), '%Y%m%d', 99, false));
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$this->setChanged(true);
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}
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}
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/**
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* Delete one statement from the Structure
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*/
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function deleteStatement($statementname) {
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$statement =& $this->getStatement($statementname);
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if ($statement) {
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$i = $this->findStatementInArray($statementname);
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$prevstatement = NULL;
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$nextstatement = NULL;
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/// Look for prev and next statement
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$prevstatement =& $this->getStatement($statement->getPrevious());
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$nextstatement =& $this->getStatement($statement->getNext());
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/// Change their previous and next attributes
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if ($prevstatement) {
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$prevstatement->setNext($statement->getNext());
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}
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if ($nextstatement) {
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$nextstatement->setPrevious($statement->getPrevious());
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}
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/// Delete the statement
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unset($this->statements[$i]);
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/// Reorder the statements
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$this->orderStatements($this->statements);
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/// Recalculate the hash
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$this->calculateHash(true);
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/// We have one deleted statement, so the structure has changed
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$this->setVersion(userdate(time(), '%Y%m%d', 99, false));
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$this->setChanged(true);
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}
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}
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/**
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* Set the tables
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*/
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function setTables(&$tables) {
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$this->tables = $tables;
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}
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/**
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* Set the statements
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*/
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function setStatements(&$statements) {
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$this->statements = $statements;
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}
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/**
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* Load data from XML to the structure
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*/
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function arr2xmldb_structure($xmlarr) {
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global $CFG;
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$result = true;
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/// Debug the structure
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/// traverse_xmlize($xmlarr); //Debug
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/// print_object ($GLOBALS['traverse_array']); //Debug
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/// $GLOBALS['traverse_array']=""; //Debug
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/// Process structure attributes (path, comment and version)
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if (isset($xmlarr['XMLDB']['@']['PATH'])) {
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$this->path = trim($xmlarr['XMLDB']['@']['PATH']);
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} else {
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$this->errormsg = 'Missing PATH attribute';
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$this->debug($this->errormsg);
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$result = false;
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}
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if (isset($xmlarr['XMLDB']['@']['VERSION'])) {
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$this->version = trim($xmlarr['XMLDB']['@']['VERSION']);
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} else {
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$this->errormsg = 'Missing VERSION attribute';
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$this->debug($this->errormsg);
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$result = false;
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}
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if (isset($xmlarr['XMLDB']['@']['COMMENT'])) {
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$this->comment = trim($xmlarr['XMLDB']['@']['COMMENT']);
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} else if (!empty($CFG->xmldbdisablecommentchecking)) {
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$this->comment = '';
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} else {
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$this->errormsg = 'Missing COMMENT attribute';
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$this->debug($this->errormsg);
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$result = false;
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}
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/// Iterate over tables
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if (isset($xmlarr['XMLDB']['#']['TABLES']['0']['#']['TABLE'])) {
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foreach ($xmlarr['XMLDB']['#']['TABLES']['0']['#']['TABLE'] as $xmltable) {
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if (!$result) { //Skip on error
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continue;
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}
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$name = trim($xmltable['@']['NAME']);
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$table = new xmldb_table($name);
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$table->arr2xmldb_table($xmltable);
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$this->tables[] = $table;
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if (!$table->isLoaded()) {
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$this->errormsg = 'Problem loading table ' . $name;
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$this->debug($this->errormsg);
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$result = false;
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}
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}
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} else {
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$this->errormsg = 'Missing TABLES section';
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$this->debug($this->errormsg);
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$result = false;
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}
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/// Perform some general checks over tables
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if ($result && $this->tables) {
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/// Check tables names are ok (lowercase, a-z _-)
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if (!$this->checkNameValues($this->tables)) {
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$this->errormsg = 'Some TABLES name values are incorrect';
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$this->debug($this->errormsg);
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$result = false;
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}
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/// Check previous & next are ok (duplicates and existing tables)
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$this->fixPrevNext($this->tables);
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if ($result && !$this->checkPreviousNextValues($this->tables)) {
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$this->errormsg = 'Some TABLES previous/next values are incorrect';
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$this->debug($this->errormsg);
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$result = false;
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}
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/// Order tables
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if ($result && !$this->orderTables($this->tables)) {
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$this->errormsg = 'Error ordering the tables';
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$this->debug($this->errormsg);
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$result = false;
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}
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}
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/// Iterate over statements
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if (isset($xmlarr['XMLDB']['#']['STATEMENTS']['0']['#']['STATEMENT'])) {
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foreach ($xmlarr['XMLDB']['#']['STATEMENTS']['0']['#']['STATEMENT'] as $xmlstatement) {
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if (!$result) { //Skip on error
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continue;
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}
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$name = trim($xmlstatement['@']['NAME']);
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$statement = new xmldb_statement($name);
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$statement->arr2xmldb_statement($xmlstatement);
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$this->statements[] = $statement;
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if (!$statement->isLoaded()) {
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$this->errormsg = 'Problem loading statement ' . $name;
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$this->debug($this->errormsg);
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$result = false;
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}
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}
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}
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/// Perform some general checks over statements
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if ($result && $this->statements) {
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/// Check statements names are ok (lowercase, a-z _-)
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if (!$this->checkNameValues($this->statements)) {
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$this->errormsg = 'Some STATEMENTS name values are incorrect';
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$this->debug($this->errormsg);
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$result = false;
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}
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/// Check previous & next are ok (duplicates and existing statements)
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$this->fixPrevNext($this->statements);
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if ($result && !$this->checkPreviousNextValues($this->statements)) {
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$this->errormsg = 'Some STATEMENTS previous/next values are incorrect';
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$this->debug($this->errormsg);
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$result = false;
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}
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/// Order statements
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if ($result && !$this->orderStatements($this->statements)) {
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$this->errormsg = 'Error ordering the statements';
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$this->debug($this->errormsg);
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$result = false;
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}
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}
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/// Set some attributes
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if ($result) {
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$this->loaded = true;
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}
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$this->calculateHash();
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return $result;
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}
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/**
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* This function calculate and set the hash of one xmldb_structure
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*/
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function calculateHash($recursive = false) {
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if (!$this->loaded) {
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$this->hash = NULL;
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} else {
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$key = $this->name . $this->path . $this->comment;
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if ($this->tables) {
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foreach ($this->tables as $tbl) {
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$table =& $this->getTable($tbl->getName());
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if ($recursive) {
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$table->calculateHash($recursive);
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}
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$key .= $table->getHash();
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}
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}
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if ($this->statements) {
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foreach ($this->statements as $sta) {
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$statement =& $this->getStatement($sta->getName());
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if ($recursive) {
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$statement->calculateHash($recursive);
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}
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$key .= $statement->getHash();
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}
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}
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$this->hash = md5($key);
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}
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}
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/**
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* This function will output the XML text for one structure
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*/
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function xmlOutput() {
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$o = '<?xml version="1.0" encoding="UTF-8" ?>' . "\n";
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$o.= '<XMLDB PATH="' . $this->path . '"';
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$o.= ' VERSION="' . $this->version . '"';
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if ($this->comment) {
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$o.= ' COMMENT="' . htmlspecialchars($this->comment) . '"'."\n";
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}
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$rel = array_fill(0, count(explode('/', $this->path)), '..');
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$rel = implode('/', $rel);
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$o.= ' xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"'."\n";
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$o.= ' xsi:noNamespaceSchemaLocation="'.$rel.'/lib/xmldb/xmldb.xsd"'."\n";
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$o.= '>' . "\n";
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/// Now the tables
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if ($this->tables) {
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$o.= ' <TABLES>' . "\n";
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foreach ($this->tables as $table) {
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$o.= $table->xmlOutput();
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}
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$o.= ' </TABLES>' . "\n";
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}
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/// Now the statements
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if ($this->statements) {
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$o.= ' <STATEMENTS>' . "\n";
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foreach ($this->statements as $statement) {
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$o.= $statement->xmlOutput();
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}
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$o.= ' </STATEMENTS>' . "\n";
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}
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$o.= '</XMLDB>';
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return $o;
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}
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/**
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* This function returns the number of uses of one table inside
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* a whole XMLDStructure. Useful to detect if the table must be
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* locked. Return false if no uses are found.
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*/
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function getTableUses($tablename) {
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$uses = array();
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/// Check if some foreign key in the whole structure is using it
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/// (by comparing the reftable with the tablename)
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$alltables = $this->getTables();
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if ($alltables) {
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foreach ($alltables as $table) {
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$keys = $table->getKeys();
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if ($keys) {
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foreach ($keys as $key) {
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if ($key->getType() == XMLDB_KEY_FOREIGN) {
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if ($tablename == $key->getRefTable()) {
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$uses[] = 'table ' . $table->getName() . ' key ' . $key->getName();
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}
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}
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}
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}
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}
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}
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/// Return result
|
|
if (!empty($uses)) {
|
|
return $uses;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This function returns the number of uses of one field inside
|
|
* a whole xmldb_structure. Useful to detect if the field must be
|
|
* locked. Return false if no uses are found.
|
|
*/
|
|
function getFieldUses($tablename, $fieldname) {
|
|
|
|
$uses = array();
|
|
|
|
/// Check if any key in the table is using it
|
|
$table = $this->getTable($tablename);
|
|
if ($keys = $table->getKeys()) {
|
|
foreach ($keys as $key) {
|
|
if (in_array($fieldname, $key->getFields()) ||
|
|
in_array($fieldname, $key->getRefFields())) {
|
|
$uses[] = 'table ' . $table->getName() . ' key ' . $key->getName();
|
|
}
|
|
}
|
|
}
|
|
/// Check if any index in the table is using it
|
|
$table = $this->getTable($tablename);
|
|
if ($indexes = $table->getIndexes()) {
|
|
foreach ($indexes as $index) {
|
|
if (in_array($fieldname, $index->getFields())) {
|
|
$uses[] = 'table ' . $table->getName() . ' index ' . $index->getName();
|
|
}
|
|
}
|
|
}
|
|
/// Check if some foreign key in the whole structure is using it
|
|
/// By comparing the reftable and refields with the field)
|
|
$alltables = $this->getTables();
|
|
if ($alltables) {
|
|
foreach ($alltables as $table) {
|
|
$keys = $table->getKeys();
|
|
if ($keys) {
|
|
foreach ($keys as $key) {
|
|
if ($key->getType() == XMLDB_KEY_FOREIGN) {
|
|
if ($tablename == $key->getRefTable()) {
|
|
$reffieds = $key->getRefFields();
|
|
if (in_array($fieldname, $key->getRefFields())) {
|
|
$uses[] = 'table ' . $table->getName() . ' key ' . $key->getName();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Return result
|
|
if (!empty($uses)) {
|
|
return $uses;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This function returns the number of uses of one key inside
|
|
* a whole xmldb_structure. Useful to detect if the key must be
|
|
* locked. Return false if no uses are found.
|
|
*/
|
|
function getKeyUses($tablename, $keyname) {
|
|
|
|
$uses = array();
|
|
|
|
/// Check if some foreign key in the whole structure is using it
|
|
/// (by comparing the reftable and reffields with the fields in the key)
|
|
$mytable = $this->getTable($tablename);
|
|
$mykey = $mytable->getKey($keyname);
|
|
$alltables = $this->getTables();
|
|
if ($alltables && $mykey) {
|
|
foreach ($alltables as $table) {
|
|
$allkeys = $table->getKeys();
|
|
if ($allkeys) {
|
|
foreach ($allkeys as $key) {
|
|
if ($key->getType() != XMLDB_KEY_FOREIGN) {
|
|
continue;
|
|
}
|
|
if ($key->getRefTable() == $tablename &&
|
|
implode(',', $key->getRefFields()) == implode(',', $mykey->getFields())) {
|
|
$uses[] = 'table ' . $table->getName() . ' key ' . $key->getName();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Return result
|
|
if (!empty($uses)) {
|
|
return $uses;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This function returns the number of uses of one index inside
|
|
* a whole xmldb_structure. Useful to detect if the index must be
|
|
* locked. Return false if no uses are found.
|
|
*/
|
|
function getIndexUses($tablename, $indexname) {
|
|
|
|
$uses = array();
|
|
|
|
/// Nothing to check, beause indexes haven't uses! Leave it here
|
|
/// for future checks...
|
|
|
|
/// Return result
|
|
if (!empty($uses)) {
|
|
return $uses;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This function will return all the errors found in one structure
|
|
* looking recursively inside each table/statement. Returns
|
|
* an array of errors or false
|
|
*/
|
|
function getAllErrors() {
|
|
|
|
$errors = array();
|
|
/// First the structure itself
|
|
if ($this->getError()) {
|
|
$errors[] = $this->getError();
|
|
}
|
|
/// Delegate to tables
|
|
if ($tables = $this->getTables()) {
|
|
foreach ($tables as $table) {
|
|
if ($tableerrors = $table->getAllErrors()) {
|
|
|
|
}
|
|
}
|
|
/// Add them to the errors array
|
|
if ($tableerrors) {
|
|
$errors = array_merge($errors, $tableerrors);
|
|
}
|
|
}
|
|
/// Delegate to statements
|
|
if ($statements = $this->getStatements()) {
|
|
foreach ($statements as $statement) {
|
|
if ($statement->getError()) {
|
|
$errors[] = $statement->getError();
|
|
}
|
|
}
|
|
}
|
|
/// Return decision
|
|
if (count($errors)) {
|
|
return $errors;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
}
|