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<?php
/**
* Database query class for ALTER TABLE 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;
use db\exception\hasAlterationException as dbAlterTableHasAlterationException;
use db\exception\hasNoAlterationException as dbAlterTableHasNoAlterationException;
use db\exception\unsupportedEngineException as dbAlterTableUnsupportedEngineException;
/**
* The alter object is used to create ALTER TABLE queries
*
* ALTER TABLE has quite a few options, for now the following are planned:
*
* ADD COLUMN column_name column_definition [ FIRST | AFTER column ]
* DROP COLUMN column_name
* MODIFY COLUMN column_name column_definition [ FIRST | AFTER column ]
* CHANGE COLUMN column_name new_column_name column_definition [ FIRST | AFTER column ]
*
* in the future, ADD / DROP / RENAME INDEX and RENAME will probably be added, others when needed.
*
* MySQL allows multiple alterations in a single command, this class will not.
*
* @package Zoph
* @author Jeroen Roos
*/
class alter extends query {
/** @var array Supported MySQL/Mariadb engines */
private static $engines = array("MyISAM", "InnoDB");
/** @var string alteration [ ADD | MODIFY | CHANGE | DROP ] for this query */
private $alteration;
/** @var string after [ FIRST | AFTER <col> ] for this query */
private $after="";
/**
* Create INSERT query
* @return string SQL query
*/
public function __toString() {
$sql = "ALTER TABLE " . $this->table;
if (empty($this->alteration)) {
throw new dbAlterTableHasNoAlterationException();
}
$sql .= " " . $this->alteration . $this->after;
return $sql . ";";
}
public function addColumn(column $column) : alter {
if (!empty($this->alteration)) {
throw new dbAlterTableHasAlterationException();
}
$this->alteration = "ADD COLUMN " . (string) $column;
return $this;
}
public function modifyColumn(column $column) : alter {
if (!empty($this->alteration)) {
throw new dbAlterTableHasAlterationException();
}
$this->alteration = "MODIFY COLUMN " . (string) $column;
return $this;
}
public function changeColumn(string $col, column $column) : alter {
if (!empty($this->alteration)) {
throw new dbAlterTableHasAlterationException();
}
$this->alteration = "CHANGE COLUMN " . $col . " " . (string) $column;
return $this;
}
public function dropColumn(string $col, bool $ifExists = false) : alter {
if (!empty($this->alteration)) {
throw new dbAlterTableHasAlterationException();
}
$this->alteration = "DROP COLUMN " . ($ifExists ? "IF EXISTS " : "") . $col;
return $this;
}
public function first() : alter {
$this->after = " FIRST";
return $this;
}
public function after(string $col) : alter {
$this->after = " AFTER " . $col;
return $this;
}
/**
* Change MySQL/MariaDB Engine
* @see alter::$engines for supported engines
* @param string engine
* @return alter for concatenation of methods
*/
public function setEngine(string $engine) : alter {
if (in_array($engine, static::$engines)) {
if (!empty($this->alteration)) {
throw new dbAlterTableHasAlterationException();
}
$this->alteration="ENGINE = \"" . $engine . "\"";
} else {
throw new dbAlterTableUnsupportedEngineException("Unknown database engine: " . $engine);
}
return $this;
}
}
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