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

/**

* Code Igniter

*

* 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

*/

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

/**

* Database Utility Class

*

* @category Database

* @author ExpressionEngine Dev Team

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

*/

class CI_DB_forge {

var $fields = array();

var $keys = array();

var $primary_keys = array();

var $db_char_set = '';

/**

* Constructor

*

* Grabs the CI super object instance so we can access it.

*

*/

function CI_DB_forge()

{

// Assign the main database object to $this->db

$CI =& get_instance();

$this->db =& $CI->db;

log_message('debug', "Database Forge Class Initialized");

}

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

/**

* Create database

*

* @access public

* @param string the database name

* @return bool

*/

function create_database($db_name)

{

$sql = $this->_create_database($db_name);

if (is_bool($sql))

{

return $sql;

}

return $this->db->query($sql);

}

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

/**

* Drop database

*

* @access public

* @param string the database name

* @return bool

*/

function drop_database($db_name)

{

$sql = $this->_drop_database($db_name);

if (is_bool($sql))

{

return $sql;

}

return $this->db->query($sql);

}

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

/**

* Add Key

*

* @access public

* @param string key

* @param string type

* @return void

*/

function add_key($key = '', $primary = FALSE)

{

if (is_array($key))

{

foreach ($key as $one)

{

$this->add_key($one, $primary);

}

return;

}

if ($key == '')

{

show_error('Key information is required for that operation.');

}

if ($primary === TRUE)

{

$this->primary_keys[] = $key;

}

else

{

$this->keys[] = $key;

}

}

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

/**

* Add Field

*

* @access public

* @param string collation

* @return void

*/

function add_field($field = '')

{

if ($field == '')

{

show_error('Field information is required.');

}

if (is_string($field))

{

if ($field == 'id')

{

$this->add_field(array(

'id' => array(

'type' => 'INT',

'constraint' => 9,

'auto_increment' => TRUE

)

));

$this->add_key('id', TRUE);

}

else

{

if (strpos($field, ' ') === FALSE)

{

show_error('Field information is required for that operation.');

}

$this->fields[] = $field;

}

}

if (is_array($field))

{

$this->fields = array_merge($this->fields, $field);

}

}

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

/**

* Create Table

*

* @access public

* @param string the table name

* @return bool

*/

function create_table($table = '', $if_not_exists = FALSE)

{

if ($table == '')

{

show_error('A table name is required for that operation.');

}

if (count($this->fields) == 0)

{

show_error('Field information is required.');

}

$sql = $this->_create_table($this->db->dbprefix.$table, $this->fields, $this->primary_keys, $this->keys, $if_not_exists);

$this->_reset();

return $this->db->query($sql);

}

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

/**

* Drop Table

*

* @access public

* @param string the table name

* @return bool

*/

function drop_table($table_name)

{

$sql = $this->_drop_table($this->db->dbprefix.$table_name);

if (is_bool($sql))

{

return $sql;

}

return $this->db->query($sql);

}

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

/**

* Rename Table

*

* @access public

* @param string the old table name

* @param string the new table name

* @return bool

*/

function rename_table($table_name, $new_table_name)

{

if ($table_name == '' OR $new_table_name == '')

{

show_error('A table name is required for that operation.');

}

$sql = $this->_rename_table($this->db->dbprefix.$table_name, $this->db->dbprefix.$new_table_name);

return $this->db->query($sql);

}

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

/**

* Column Add

*

* @access public

* @param string the table name

* @param string the column name

* @param string the column definition

* @return bool

*/

function add_column($table = '', $field = array(), $after_field = '')

{

if ($table == '')

{

show_error('A table name is required for that operation.');

}

// add field info into field array, but we can only do one at a time

// so we cycle through

foreach ($field as $k => $v)

{

$this->add_field(array($k => $field[$k]));

if (count($this->fields) == 0)

{

show_error('Field information is required.');

}

$sql = $this->_alter_table('ADD', $this->db->dbprefix.$table, $this->fields, $after_field);

$this->_reset();

if ($this->db->query($sql) === FALSE)

{

return FALSE;

}

}

return TRUE;

}

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

/**

* Column Drop

*

* @access public

* @param string the table name

* @param string the column name

* @return bool

*/

function drop_column($table = '', $column_name = '')

{

if ($table == '')

{

show_error('A table name is required for that operation.');

}

if ($column_name == '')

{

show_error('A column name is required for that operation.');

}

$sql = $this->_alter_table('DROP', $this->db->dbprefix.$table, $column_name);

return $this->db->query($sql);

}

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

/**

* Column Modify

*

* @access public

* @param string the table name

* @param string the column name

* @param string the column definition

* @return bool

*/

function modify_column($table = '', $field = array())

{

if ($table == '')

{

show_error('A table name is required for that operation.');

}

// add field info into field array, but we can only do one at a time

// so we cycle through

foreach ($field as $k => $v)

{

// If no name provided, use the current name

if ( ! isset($field[$k]['name']))

{

$field[$k]['name'] = $k;

}

$this->add_field(array($k => $field[$k]));

if (count($this->fields) == 0)

{

show_error('Field information is required.');

}

$sql = $this->_alter_table('CHANGE', $this->db->dbprefix.$table, $this->fields);

$this->_reset();

if ($this->db->query($sql) === FALSE)

{

return FALSE;

}

}

return TRUE;

}

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

/**

* Reset

*

* Resets table creation vars

*

* @access private

* @return void

*/

function _reset()

{

$this->fields = array();

$this->keys = array();

$this->primary_keys = array();

}

}

/* End of file DB_forge.php */

/* Location: ./system/database/DB_forge.php */