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/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2019 - 2022, CodeIgniter Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the &quot;Software&quot;), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
 * @copyright	Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/)
 * @license	https://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 2.1.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * CUBRID Forge Class
 *
 * @category	Database
 * @author		Esen Sagynov
 * @link		https://codeigniter.com/userguide3/database/
 */
class CI_DB_cubrid_forge extends CI_DB_forge {

	/**
	 * CREATE DATABASE statement
	 *
	 * @var	string
	 */
	protected $_create_database	= FALSE;

	/**
	 * CREATE TABLE keys flag
	 *
	 * Whether table keys are created from within the
	 * CREATE TABLE statement.
	 *
	 * @var	bool
	 */
	protected $_create_table_keys	= TRUE;

	/**
	 * DROP DATABASE statement
	 *
	 * @var	string
	 */
	protected $_drop_database	= FALSE;

	/**
	 * CREATE TABLE IF statement
	 *
	 * @var	string
	 */
	protected $_create_table_if	= FALSE;

	/**
	 * UNSIGNED support
	 *
	 * @var	array
	 */
	protected $_unsigned		= array(
		'SHORT'		=&gt; 'INTEGER',
		'SMALLINT'	=&gt; 'INTEGER',
		'INT'		=&gt; 'BIGINT',
		'INTEGER'	=&gt; 'BIGINT',
		'BIGINT'	=&gt; 'NUMERIC',
		'FLOAT'		=&gt; 'DOUBLE',
		'REAL'		=&gt; 'DOUBLE'
	);

	// --------------------------------------------------------------------

	/**
	 * ALTER TABLE
	 *
	 * @param	string	$alter_type	ALTER type
	 * @param	string	$table		Table name
	 * @param	mixed	$field		Column definition
	 * @return	string|string[]
	 */
	protected function _alter_table($alter_type, $table, $field)
	{
		if (in_array($alter_type, array('DROP', 'ADD'), TRUE))
		{
			return parent::_alter_table($alter_type, $table, $field);
		}

		$sql = 'ALTER TABLE '.$this-&gt;db-&gt;escape_identifiers($table);
		$sqls = array();
		for ($i = 0, $c = count($field); $i &lt; $c; $i++)
		{
			if ($field[$i]['_literal'] !== FALSE)
			{
				$sqls[] = $sql.' CHANGE '.$field[$i]['_literal'];
			}
			else
			{
				$alter_type = empty($field[$i]['new_name']) ? ' MODIFY ' : ' CHANGE ';
				$sqls[] = $sql.$alter_type.$this-&gt;_process_column($field[$i]);
			}
		}

		return $sqls;
	}

	// --------------------------------------------------------------------

	/**
	 * Process column
	 *
	 * @param	array	$field
	 * @return	string
	 */
	protected function _process_column($field)
	{
		$extra_clause = isset($field['after'])
			? ' AFTER '.$this-&gt;db-&gt;escape_identifiers($field['after']) : '';

		if (empty($extra_clause) &amp;&amp; isset($field['first']) &amp;&amp; $field['first'] === TRUE)
		{
			$extra_clause = ' FIRST';
		}

		return $this-&gt;db-&gt;escape_identifiers($field['name'])
			.(empty($field['new_name']) ? '' : ' '.$this-&gt;db-&gt;escape_identifiers($field['new_name']))
			.' '.$field['type'].$field['length']
			.$field['unsigned']
			.$field['null']
			.$field['default']
			.$field['auto_increment']
			.$field['unique']
			.$extra_clause;
	}

	// --------------------------------------------------------------------

	/**
	 * Field attribute TYPE
	 *
	 * Performs a data type mapping between different databases.
	 *
	 * @param	array	&amp;$attributes
	 * @return	void
	 */
	protected function _attr_type(&amp;$attributes)
	{
		switch (strtoupper($attributes['TYPE']))
		{
			case 'TINYINT':
				$attributes['TYPE'] = 'SMALLINT';
				$attributes['UNSIGNED'] = FALSE;
				return;
			case 'MEDIUMINT':
				$attributes['TYPE'] = 'INTEGER';
				$attributes['UNSIGNED'] = FALSE;
				return;
			case 'LONGTEXT':
				$attributes['TYPE'] = 'STRING';
				return;
			default: return;
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Process indexes
	 *
	 * @param	string	$table	(ignored)
	 * @return	string
	 */
	protected function _process_indexes($table)
	{
		$sql = '';

		for ($i = 0, $c = count($this-&gt;keys); $i &lt; $c; $i++)
		{
			if (is_array($this-&gt;keys[$i]))
			{
				for ($i2 = 0, $c2 = count($this-&gt;keys[$i]); $i2 &lt; $c2; $i2++)
				{
					if ( ! isset($this-&gt;fields[$this-&gt;keys[$i][$i2]]))
					{
						unset($this-&gt;keys[$i][$i2]);
						continue;
					}
				}
			}
			elseif ( ! isset($this-&gt;fields[$this-&gt;keys[$i]]))
			{
				unset($this-&gt;keys[$i]);
				continue;
			}

			is_array($this-&gt;keys[$i]) OR $this-&gt;keys[$i] = array($this-&gt;keys[$i]);

			$sql .= &quot;,\n\tKEY &quot;.$this-&gt;db-&gt;escape_identifiers(implode('_', $this-&gt;keys[$i]))
				.' ('.implode(', ', $this-&gt;db-&gt;escape_identifiers($this-&gt;keys[$i])).')';
		}

		$this-&gt;keys = array();

		return $sql;
	}

}
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