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dmllib.php
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dmllib.php
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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 contains all the Data Manipulation Language (DML) functions
* used to interact with the DB
*
* This library contains all the Data Manipulation Language (DML) functions
* used to interact with the DB. All the dunctions in this library must be
* generic and work against the major number of RDBMS possible. This is the
* list of currently supported and tested DBs: mysql, postresql, mssql, oracle
* This library is automatically included by Moodle core so you never need to
* include it yourself.
* For more info about the functions available in this library, please visit:
* http://docs.moodle.org/en/DML_functions
* (feel free to modify, improve and document such page, thanks!)
*
* @package moodlecore
* @subpackage DML
* @copyright 2008 Petr Skoda (http://skodak.org)
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
// Require the essential
require_once($CFG->libdir.'/dml/moodle_database.php');
/**
* DML exception class, use instead of error() in dml code.
*/
class dml_exception extends moodle_exception {
/**
* @param string $errorcode
* @param string $a
* @param string $debuginfo
*/
function __construct($errorcode, $a=NULL, $debuginfo=null) {
parent::__construct($errorcode, '', '', $a, $debuginfo);
}
}
/**
* DML db connection exception - triggered if database not accessible.
*/
class dml_connection_exception extends dml_exception {
/**
* @param string $error
*/
function __construct($error) {
$errorinfo = '<em>'.s($error).'</em>';
parent::__construct('dbconnectionfailed', NULL, $errorinfo);
}
}
/**
* DML read exception - triggered by SQL syntax errors, missing tables, etc.
*/
class dml_read_exception extends dml_exception {
/** @var string */
public $error;
public $sql;
/** @var array */
public $params;
/**
* @param string $error
* @param string $sql
* @param array $params
*/
function __construct($error, $sql=null, array $params=null) {
$this->error = $error;
$this->sql = $sql;
$this->params = $params;
$errorinfo = s($error).'<br /><br />'.s($sql).'<br />['.s(var_export($params, true)).']';
parent::__construct('dmlreadexception', NULL, $errorinfo);
}
}
/**
* DML read exception - triggered by SQL syntax errors, missing tables, etc.
*/
class dml_write_exception extends dml_exception {
/** @var string */
public $error;
public $sql;
/** @var array */
public $params;
/**
* @param string $error
* @param string $sql
* @param array $params
*/
function __construct($error, $sql=null, array $params=null) {
$this->error = $error;
$this->sql = $sql;
$this->params = $params;
$errorinfo = s($error).'<br /><br />'.s($sql).'<br />['.s(var_export($params, true)).']';
parent::__construct('dmlwriteexception', NULL, $errorinfo);
}
}
/**
* Sets up global $DB moodle_database instance
*
* @global object
* @global object
* @return void
*/
function setup_DB() {
global $CFG, $DB;
if (isset($DB)) {
return;
}
if (!isset($CFG->dbuser)) {
$CFG->dbuser = '';
}
if (!isset($CFG->dbpass)) {
$CFG->dbpass = '';
}
if (!isset($CFG->dbname)) {
$CFG->dbname = '';
}
if (!isset($CFG->dblibrary)) {
switch ($CFG->dbtype) {
case 'postgres7' :
$CFG->dbtype = 'pgsql';
// continue, no break here
case 'pgsql' :
$CFG->dblibrary = 'native';
break;
case 'mysql' :
if (!extension_loaded('mysqli')) {
$CFG->dblibrary = 'adodb';
break;
}
$CFG->dbtype = 'mysqli';
// continue, no break here
case 'mysqli' :
$CFG->dblibrary = 'native';
break;
default:
// the rest of drivers is not converted yet - keep adodb for now
$CFG->dblibrary = 'adodb';
}
}
if (!isset($CFG->dboptions)) {
$CFG->dboptions = array();
}
if (isset($CFG->dbpersist)) {
$CFG->dboptions['dbpersist'] = $CFG->dbpersist;
}
if (!$DB = moodle_database::get_driver_instance($CFG->dbtype, $CFG->dblibrary)) {
throw new dml_exception('dbdriverproblem', "Unknown driver $CFG->dblibrary/$CFG->dbtype");
}
try {
$DB->connect($CFG->dbhost, $CFG->dbuser, $CFG->dbpass, $CFG->dbname, $CFG->prefix, $CFG->dboptions);
} catch (moodle_exception $e) {
if (empty($CFG->noemailever) and !empty($CFG->emailconnectionerrorsto)) {
if (file_exists($CFG->dataroot.'/emailcount')){
$fp = @fopen($CFG->dataroot.'/emailcount', 'r');
$content = @fread($fp, 24);
@fclose($fp);
if((time() - (int)$content) > 600){
@mail($CFG->emailconnectionerrorsto,
'WARNING: Database connection error: '.$CFG->wwwroot,
'Connection error: '.$CFG->wwwroot);
$fp = @fopen($CFG->dataroot.'/emailcount', 'w');
@fwrite($fp, time());
}
} else {
@mail($CFG->emailconnectionerrorsto,
'WARNING: Database connection error: '.$CFG->wwwroot,
'Connection error: '.$CFG->wwwroot);
$fp = @fopen($CFG->dataroot.'/emailcount', 'w');
@fwrite($fp, time());
}
}
// rethrow the exception
throw $e;
}
$CFG->dbfamily = $DB->get_dbfamily(); // TODO: BC only for now
return true;
}