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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* This library includes all the required functions used to handle the DB
* structure (DDL) independently of the underlying RDBMS in use.
*
* This library includes all the required functions used to handle the DB
* structure (DDL) independently of the underlying RDBMS in use. All the functions
* rely on the XMLDBDriver classes to be able to generate the correct SQL
* syntax needed by each DB.
*
* To define any structure to be created we'll use the schema defined
* by the XMLDB classes, for tables, fields, indexes, keys and other
* statements instead of direct handling of SQL sentences.
*
* This library should be used, exclusively, by the installation and
* upgrade process of Moodle.
*
* For further documentation, visit {@link http://docs.moodle.org/en/DDL_functions}
*
* @package core
* @subpackage ddl
* @copyright 2001-3001 Eloy Lafuente (stronk7) http://contiento.com
* 2008 Petr Skoda http://skodak.org
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
// Add required library
require_once($CFG->libdir.'/xmlize.php');
// Add required XMLDB constants
require_once($CFG->libdir.'/xmldb/xmldb_constants.php');
// Add required XMLDB DB classes
require_once($CFG->libdir.'/xmldb/xmldb_object.php');
// Add required XMLDB DB classes
require_once($CFG->libdir.'/xmldb/xmldb_file.php');
// Add required XMLDB DB classes
require_once($CFG->libdir.'/xmldb/xmldb_structure.php');
// Add required XMLDB DB classes
require_once($CFG->libdir.'/xmldb/xmldb_table.php');
// Add required XMLDB DB classes
require_once($CFG->libdir.'/xmldb/xmldb_field.php');
// Add required XMLDB DB classes
require_once($CFG->libdir.'/xmldb/xmldb_key.php');
// Add required XMLDB DB classes
require_once($CFG->libdir.'/xmldb/xmldb_index.php');
require_once($CFG->libdir.'/ddl/sql_generator.php');
require_once($CFG->libdir.'/ddl/database_manager.php');
/**
* DDL exception class, use instead of print_error() and "return false;" in ddl code.
*/
class ddl_exception extends moodle_exception {
/**
* @param string $errorcode
* @param string $debuginfo
*/
function __construct($errorcode, $a=NULL, $debuginfo=null) {
parent::__construct($errorcode, '', '', $a, $debuginfo);
}
}
/**
* Table does not exist problem exception
*/
class ddl_table_missing_exception extends ddl_exception {
/**
* @param string $tablename
* @param string $debuginfo
*/
function __construct($tablename, $debuginfo=null) {
parent::__construct('ddltablenotexist', $tablename, $debuginfo);
}
}
/**
* Table does not exist problem exception
*/
class ddl_field_missing_exception extends ddl_exception {
/**
* @param string $fieldname
* @param string $tablename
* @param string $debuginfo
*/
function __construct($fieldname, $tablename, $debuginfo=null) {
$a = new stdClass();
$a->fieldname = $fieldname;
$a->tablename = $tablename;
parent::__construct('ddlfieldnotexist', $a, $debuginfo);
}
}
/**
* Error during changing db structure
*/
class ddl_change_structure_exception extends ddl_exception {
/** @var string */
public $error;
public $sql;
/**
* @param string $error
* @param string $sql
*/
function __construct($error, $sql=null) {
$this->error = $error;
$this->sql = $sql;
$errorinfo = $error."\n".$sql;
parent::__construct('ddlexecuteerror', NULL, $errorinfo);
}
}
/**
* Error changing db structure, caused by some dependency found
* like trying to modify one field having related indexes.
*/
class ddl_dependency_exception extends ddl_exception {
function __construct($targettype, $targetname, $offendingtype, $offendingname, $debuginfo=null) {
$a = new stdClass();
$a->targettype = $targettype;
$a->targetname = $targetname;
$a->offendingtype = $offendingtype;
$a->offendingname = $offendingname;
parent::__construct('ddldependencyerror', $a, $debuginfo);
}
}