<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.2.4 or newer * * NOTICE OF LICENSE * * Licensed under the Open Software License version 3.0 * * This source file is subject to the Open Software License (OSL 3.0) that is * bundled with this package in the files license.txt / license.rst. It is * also available through the world wide web at this URL: * http://opensource.org/licenses/OSL-3.0 * If you did not receive a copy of the license and are unable to obtain it * through the world wide web, please send an email to * licensing@ellislab.com so we can send you a copy immediately. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/) * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) * @link http://codeigniter.com * @since Version 1.0 * @filesource */ /** * Database Forge Class * * @category Database * @author EllisLab Dev Team * @link http://codeigniter.com/user_guide/database/ */ abstract class CI_DB_forge { public $fields = array(); public $keys = array(); public $primary_keys = array(); public $db_char_set = ''; // Platform specific SQL strings protected $_create_database = 'CREATE DATABASE %s'; protected $_drop_database = 'DROP DATABASE %s'; protected $_drop_table = 'DROP TABLE IF EXISTS %s'; protected $_rename_table = 'ALTER TABLE %s RENAME TO %s'; public function __construct() { // Assign the main database object to $this->db $CI =& get_instance(); $this->db =& $CI->db; log_message('debug', 'Database Forge Class Initialized'); } // -------------------------------------------------------------------- /** * Create database * * @param string the database name * @return bool */ public function create_database($db_name) { if ($this->_create_database === FALSE) { return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE; } elseif ( ! $this->db->query(sprintf($this->_create_database, $db_name, $this->db->char_set, $this->db->dbcollat))) { return ($this->db->db_debug) ? $this->db->display_error('db_unable_to_drop') : FALSE; } return TRUE; } // -------------------------------------------------------------------- /** * Drop database * * @param string the database name * @return bool */ public function drop_database($db_name) { if ($db_name == '') { show_error('A table name is required for that operation.'); return FALSE; } elseif ($this->_drop_database === FALSE) { return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE; } elseif ( ! $this->db->query(sprintf($this->_drop_database, $db_name))) { return ($this->db->db_debug) ? $this->db->display_error('db_unable_to_drop') : FALSE; } return TRUE; } // -------------------------------------------------------------------- /** * Add Key * * @param string key * @param string type * @return object */ public function add_key($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; } return $this; } // -------------------------------------------------------------------- /** * Add Field * * @param string collation * @return object */ public function add_field($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); } return $this; } // -------------------------------------------------------------------- /** * Create Table * * @param string the table name * @return bool */ public function create_table($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); $this->_reset(); return is_bool($sql) ? $sql : $this->db->query($sql); } // -------------------------------------------------------------------- /** * Drop Table * * @param string the table name * @return bool */ public function drop_table($table_name) { if ($table_name == '') { return ($this->db->db_debug) ? $this->db->display_error('db_table_name_required') : FALSE; } elseif ($this->_drop_table === FALSE) { return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE; } return $this->db->query(sprintf($this->_drop_table, $this->db->escape_identifiers($this->db->dbprefix.$table_name))); } // -------------------------------------------------------------------- /** * Rename Table * * @param string the old table name * @param string the new table name * @return bool */ public function rename_table($table_name, $new_table_name) { if ($table_name == '' OR $new_table_name == '') { show_error('A table name is required for that operation.'); return FALSE; } elseif ($this->_rename_table === FALSE) { return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE; } return $this->db->query(sprintf($this->_rename_table, $this->db->escape_identifiers($this->db->dbprefix.$table_name), $this->db->escape_identifiers($this->db->dbprefix.$new_table_name)) ); } // -------------------------------------------------------------------- /** * Column Add * * @param string the table name * @param string the column name * @param string the column definition * @return bool */ public function add_column($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 (array_keys($field) as $k) { $this->add_field(array($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($sql) === FALSE) { return FALSE; } } return TRUE; } // -------------------------------------------------------------------- /** * Column Drop * * @param string the table name * @param string the column name * @return bool */ public function drop_column($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.'); } return $this->db->query($this->_alter_table('DROP', $this->db->dbprefix.$table, $column_name)); } // -------------------------------------------------------------------- /** * Column Modify * * @param string the table name * @param string the column name * @param string the column definition * @return bool */ public function modify_column($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 (array_keys($field) as $k) { // If no name provided, use the current name if ( ! isset($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 * * @return void */ protected function _reset() { $this->fields = $this->keys = $this->primary_keys = array(); } } /* End of file DB_forge.php */ /* Location: ./system/database/DB_forge.php */