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<?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

 */

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

/**

 * SQLite Forge Class

 *

 * @category	Database

 * @author		ExpressionEngine Dev Team

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

 */

class CI_DB_sqlite_forge extends CI_DB_forge {

	/**

	 * Create database

	 *

	 * @access	public

	 * @param	string	the database name

	 * @return	bool

	 */

	function _create_database()

	{

		// In SQLite, a database is created when you connect to the database.

		// We'll return TRUE so that an error isn't generated

		return TRUE;

	}

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

	/**

	 * Drop database

	 *

	 * @access	private

	 * @param	string	the database name

	 * @return	bool

	 */

	function _drop_database($name)

	{

		if ( ! @file_exists($this->db->database) OR ! @unlink($this->db->database))

		{

			if ($this->db->db_debug)

			{

				return $this->db->display_error('db_unable_to_drop');

			}

			return FALSE;

		}

		return TRUE;

	}

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

	/**

	 * Create Table

	 *

	 * @access	private

	 * @param	string	the table name

	 * @param	array	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 NOT EXISTS added to SQLite in 3.3.0

		if ($if_not_exists === TRUE && version_compare($this->db->_version(), '3.3.0', '>=') === TRUE)

		{

			$sql .= 'IF NOT EXISTS ';

		}

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

		$current_field_count = 0;

		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);

				$sql .=  ' '.$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 .= ',';

			}

		}

		if (count($primary_keys) > 0)

		{

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

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

		}

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

		{

			foreach ($keys as $key)

			{

				if (is_array($key))

				{

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

				}

				else

				{

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

				}

				$sql .= ",\n\tUNIQUE (" . implode(', ', $key) . ")";

			}

		}

		$sql .= "\n)";

		return $sql;

	}

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

	/**

	 * Drop Table

	 *

	 *  Unsupported feature in SQLite

	 *

	 * @access	private

	 * @return	bool

	 */

	function _drop_table($table)

	{

		if ($this->db->db_debug)

		{

			return $this->db->display_error('db_unsuported_feature');

		}

		return array();

	}

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

	/**

	 * 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	string	the table name

	 * @param	string	the column definition

	 * @param	string	the default value

	 * @param	boolean	should 'NOT NULL' be added

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

	 * @return	object

	 */

	function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')

	{

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

		// DROP has everything it needs now.

		if ($alter_type == 'DROP')

		{

			// SQLite does not support dropping columns

			// http://www.sqlite.org/omitted.html

			// http://www.sqlite.org/faq.html#q11

			return FALSE;

		}

		$sql .= " $column_definition";

		if ($default_value != '')

		{

			$sql .= " DEFAULT \"$default_value\"";

		}

		if ($null === NULL)

		{

			$sql .= ' NULL';

		}

		else

		{

			$sql .= ' NOT NULL';

		}

		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 sqlite_forge.php */

/* Location: ./system/database/drivers/sqlite/sqlite_forge.php */