<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 5.1.6 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.

 * @license		http://codeigniter.com/user_guide/license.html

 * @link		http://codeigniter.com

 * @since		Version 1.0

 * @filesource

 */



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



/**

 * MySQLi Forge Class

 *

 * @category	Database

 * @author		ExpressionEngine Dev Team

 * @link		http://codeigniter.com/user_guide/database/

 */

class CI_DB_mysqli_forge extends CI_DB_forge {



	/**

	 * Create database

	 *

	 * @access	private

	 * @param	string	the database name

	 * @return	bool

	 */

	function _create_database($name)

	{

		return "CREATE DATABASE ".$name;

	}



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



	/**

	 * Drop database

	 *

	 * @access	private

	 * @param	string	the database name

	 * @return	bool

	 */

	function _drop_database($name)

	{

		return "DROP DATABASE ".$name;

	}



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



	/**

	 * Process Fields

	 *

	 * @access	private

	 * @param	mixed	the fields

	 * @return	string

	 */

	function _process_fields($fields)

	{

		$current_field_count = 0;

		$sql = '';



		foreach ($fields as $field=>$attributes)

		{

			// Numeric field names aren't allowed in databases, so if the key is

			// numeric, we know it was assigned by PHP and the developer manually

			// entered the field information, so we'll simply add it to the list

			if (is_numeric($field))

			{

				$sql .= "\n\t$attributes";

			}

			else

			{

				$attributes = array_change_key_case($attributes, CASE_UPPER);



				$sql .= "\n\t".$this->db->_protect_identifiers($field);



				if (array_key_exists('NAME', $attributes))

				{

					$sql .= ' '.$this->db->_protect_identifiers($attributes['NAME']).' ';

				}



				if (array_key_exists('TYPE', $attributes))

				{

					$sql .=  ' '.$attributes['TYPE'];

				}



				if (array_key_exists('CONSTRAINT', $attributes))

				{

					$sql .= '('.$attributes['CONSTRAINT'].')';

				}



				if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)

				{

					$sql .= ' UNSIGNED';

				}



				if (array_key_exists('DEFAULT', $attributes))

				{

					$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';

				}



				if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)

				{

					$sql .= ' NULL';

				}

				else

				{

					$sql .= ' NOT NULL';

				}



				if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)

				{

					$sql .= ' AUTO_INCREMENT';

				}

			}



			// don't add a comma on the end of the last field

			if (++$current_field_count < count($fields))

			{

				$sql .= ',';

			}

		}



		return $sql;

	}



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



	/**

	 * Create Table

	 *

	 * @access	private

	 * @param	string	the table name

	 * @param	mixed	the fields

	 * @param	mixed	primary key(s)

	 * @param	mixed	key(s)

	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL

	 * @return	bool

	 */

	function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)

	{

		$sql = 'CREATE TABLE ';



		if ($if_not_exists === TRUE)

		{

			$sql .= 'IF NOT EXISTS ';

		}



		$sql .= $this->db->_escape_identifiers($table)." (";



		$sql .= $this->_process_fields($fields);



		if (count($primary_keys) > 0)

		{

			$key_name = $this->db->_protect_identifiers(implode('_', $primary_keys));

			$primary_keys = $this->db->_protect_identifiers($primary_keys);

			$sql .= ",\n\tPRIMARY KEY ".$key_name." (" . implode(', ', $primary_keys) . ")";

		}



		if (is_array($keys) && count($keys) > 0)

		{

			foreach ($keys as $key)

			{

				if (is_array($key))

				{

					$key_name = $this->db->_protect_identifiers(implode('_', $key));

					$key = $this->db->_protect_identifiers($key);

				}

				else

				{

					$key_name = $this->db->_protect_identifiers($key);

					$key = array($key_name);

				}



				$sql .= ",\n\tKEY {$key_name} (" . implode(', ', $key) . ")";

			}

		}



		$sql .= "\n) DEFAULT CHARACTER SET {$this->db->char_set} COLLATE {$this->db->dbcollat};";



		return $sql;

	}



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



	/**

	 * Drop Table

	 *

	 * @access	private

	 * @return	string

	 */

	function _drop_table($table)

	{

		return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table);

	}



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



	/**

	 * Alter table query

	 *

	 * Generates a platform-specific query so that a table can be altered

	 * Called by add_column(), drop_column(), and column_alter(),

	 *

	 * @access	private

	 * @param	string	the ALTER type (ADD, DROP, CHANGE)

	 * @param	string	the column name

	 * @param	array	fields

	 * @param	string	the field after which we should add the new field

	 * @return	object

	 */

	function _alter_table($alter_type, $table, $fields, $after_field = '')

	{

		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ";



		// DROP has everything it needs now.

		if ($alter_type == 'DROP')

		{

			return $sql.$this->db->_protect_identifiers($fields);

		}



		$sql .= $this->_process_fields($fields);



		if ($after_field != '')

		{

			$sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);

		}



		return $sql;

	}



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



	/**

	 * Rename a table

	 *

	 * Generates a platform-specific query so that a table can be renamed

	 *

	 * @access	private

	 * @param	string	the old table name

	 * @param	string	the new table name

	 * @return	string

	 */

	function _rename_table($table_name, $new_table_name)

	{

		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);

		return $sql;

	}



}



/* End of file mysqli_forge.php */

/* Location: ./system/database/drivers/mysqli/mysqli_forge.php */