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<?php
/**
* Database query class for UPDATE queries
*
* This file is part of Zoph.
*
* Zoph 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 2 of the License, or
* (at your option) any later version.
*
* Zoph 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 Zoph; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @package Zoph
* @author Jeroen Roos
*/
namespace db;
/**
* The insert object is used to create UPDATE queries
*
* @package Zoph
* @author Jeroen Roos
*/
class update extends query {
/** @var bool Set to true to allow UPDATE query without WHERE
this will delete all data from the table
There currently is no way of setting this, because it
is a protection against accidently running a query like
this during development or due to a bug */
private $updateAll=false;
/** @var array Array of fields to be SET in UPDATE query */
private $set=array();
/**
* Add a field to be SET in UPDATE query
* @param string field to be SET
* @param string name of param to be used to SET this field
*/
public function addSet($field, $param) {
$this->set[]=$field . "=:" . $param;
}
/**
* Add a field to be SET in UPDATE query, using a function to set it
* @param string field=function() expression
*/
public function addSetFunction($function) {
$this->set[]=$function;
}
/**
* Get array of SET statements for this query
* @return array SET statements
*/
public function getSet() {
return $this->set;
}
/**
* Create UPDATE query
* @return string SQL query
*/
public function __toString() {
$sql = "UPDATE " . $this->table . " SET ";
if (is_array($this->set)) {
$sql.=implode(", ", $this->set);
} else {
throw new exception("UPDATE with no SET");
}
if ($this->where instanceof clause) {
$sql .= " WHERE " . $this->where;
} else if (!$this->updateAll) {
die("UPDATE query without WHERE");
}
return $sql . ";";
}
}
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