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Sampanna Rimal
243
hostel/system/database/drivers/mysql/mysql_forge.php
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243
hostel/system/database/drivers/mysql/mysql_forge.php
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<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2019, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 1.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* MySQL Forge Class
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*
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* @category Database
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/user_guide/database/
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*/
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class CI_DB_mysql_forge extends CI_DB_forge {
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/**
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* CREATE DATABASE statement
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*
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* @var string
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*/
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protected $_create_database = 'CREATE DATABASE %s CHARACTER SET %s COLLATE %s';
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/**
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* CREATE TABLE keys flag
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*
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* Whether table keys are created from within the
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* CREATE TABLE statement.
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*
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* @var bool
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*/
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protected $_create_table_keys = TRUE;
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/**
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* UNSIGNED support
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*
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* @var array
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*/
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protected $_unsigned = array(
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'TINYINT',
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'SMALLINT',
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'MEDIUMINT',
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'INT',
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'INTEGER',
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'BIGINT',
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'REAL',
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'DOUBLE',
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'DOUBLE PRECISION',
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'FLOAT',
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'DECIMAL',
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'NUMERIC'
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);
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/**
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* NULL value representation in CREATE/ALTER TABLE statements
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*
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* @var string
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*/
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protected $_null = 'NULL';
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// --------------------------------------------------------------------
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/**
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* CREATE TABLE attributes
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*
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* @param array $attributes Associative array of table attributes
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* @return string
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*/
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protected function _create_table_attr($attributes)
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{
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$sql = '';
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foreach (array_keys($attributes) as $key)
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{
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if (is_string($key))
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{
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$sql .= ' '.strtoupper($key).' = '.$attributes[$key];
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}
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}
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if ( ! empty($this->db->char_set) && ! strpos($sql, 'CHARACTER SET') && ! strpos($sql, 'CHARSET'))
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{
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$sql .= ' DEFAULT CHARACTER SET = '.$this->db->char_set;
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}
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if ( ! empty($this->db->dbcollat) && ! strpos($sql, 'COLLATE'))
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{
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$sql .= ' COLLATE = '.$this->db->dbcollat;
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* ALTER TABLE
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*
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* @param string $alter_type ALTER type
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* @param string $table Table name
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* @param mixed $field Column definition
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* @return string|string[]
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*/
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protected function _alter_table($alter_type, $table, $field)
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{
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if ($alter_type === 'DROP')
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{
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return parent::_alter_table($alter_type, $table, $field);
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}
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$sql = 'ALTER TABLE '.$this->db->escape_identifiers($table);
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for ($i = 0, $c = count($field); $i < $c; $i++)
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{
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if ($field[$i]['_literal'] !== FALSE)
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{
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$field[$i] = ($alter_type === 'ADD')
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? "\n\tADD ".$field[$i]['_literal']
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: "\n\tMODIFY ".$field[$i]['_literal'];
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}
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else
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{
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if ($alter_type === 'ADD')
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{
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$field[$i]['_literal'] = "\n\tADD ";
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}
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else
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{
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$field[$i]['_literal'] = empty($field[$i]['new_name']) ? "\n\tMODIFY " : "\n\tCHANGE ";
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}
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$field[$i] = $field[$i]['_literal'].$this->_process_column($field[$i]);
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}
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}
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return array($sql.implode(',', $field));
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}
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// --------------------------------------------------------------------
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/**
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* Process column
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*
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* @param array $field
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* @return string
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*/
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protected function _process_column($field)
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{
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$extra_clause = isset($field['after'])
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? ' AFTER '.$this->db->escape_identifiers($field['after']) : '';
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if (empty($extra_clause) && isset($field['first']) && $field['first'] === TRUE)
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{
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$extra_clause = ' FIRST';
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}
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return $this->db->escape_identifiers($field['name'])
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.(empty($field['new_name']) ? '' : ' '.$this->db->escape_identifiers($field['new_name']))
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.' '.$field['type'].$field['length']
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.$field['unsigned']
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.$field['null']
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.$field['default']
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.$field['auto_increment']
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.$field['unique']
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.(empty($field['comment']) ? '' : ' COMMENT '.$field['comment'])
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.$extra_clause;
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}
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// --------------------------------------------------------------------
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/**
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* Process indexes
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*
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* @param string $table (ignored)
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* @return string
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*/
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protected function _process_indexes($table)
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{
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$sql = '';
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for ($i = 0, $c = count($this->keys); $i < $c; $i++)
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{
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if (is_array($this->keys[$i]))
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{
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for ($i2 = 0, $c2 = count($this->keys[$i]); $i2 < $c2; $i2++)
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{
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if ( ! isset($this->fields[$this->keys[$i][$i2]]))
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{
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unset($this->keys[$i][$i2]);
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continue;
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}
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}
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}
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elseif ( ! isset($this->fields[$this->keys[$i]]))
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{
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unset($this->keys[$i]);
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continue;
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}
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is_array($this->keys[$i]) OR $this->keys[$i] = array($this->keys[$i]);
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$sql .= ",\n\tKEY ".$this->db->escape_identifiers(implode('_', $this->keys[$i]))
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.' ('.implode(', ', $this->db->escape_identifiers($this->keys[$i])).')';
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}
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$this->keys = array();
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return $sql;
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}
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}
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