/halogy/database/drivers/mysqli/mysqli_forge.php

  1<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
  2/**
  3 * CodeIgniter
  4 *
  5 * An open source application development framework for PHP 4.3.2 or newer
  6 *
  7 * @package		CodeIgniter
  8 * @author		ExpressionEngine Dev Team
  9 * @copyright	Copyright (c) 2008 - 2009, EllisLab, Inc.
 10 * @license		http://codeigniter.com/user_guide/license.html
 11 * @link		http://codeigniter.com
 12 * @since		Version 1.0
 13 * @filesource
 14 */
 15
 16// ------------------------------------------------------------------------
 17
 18/**
 19 * MySQLi Forge Class
 20 *
 21 * @category	Database
 22 * @author		ExpressionEngine Dev Team
 23 * @link		http://codeigniter.com/user_guide/database/
 24 */
 25class CI_DB_mysqli_forge extends CI_DB_forge {
 26	
 27	/**
 28	 * Create database
 29	 *
 30	 * @access	private
 31	 * @param	string	the database name
 32	 * @return	bool
 33	 */
 34	function _create_database($name)
 35	{
 36		return "CREATE DATABASE ".$name;
 37	}
 38
 39	// --------------------------------------------------------------------
 40
 41	/**
 42	 * Drop database
 43	 *
 44	 * @access	private
 45	 * @param	string	the database name
 46	 * @return	bool
 47	 */
 48	function _drop_database($name)
 49	{
 50		return "DROP DATABASE ".$name;
 51	}
 52
 53	// --------------------------------------------------------------------
 54
 55	/**
 56	 * Process Fields
 57	 *
 58	 * @access	private
 59	 * @param	mixed	the fields
 60	 * @return	string
 61	 */
 62	function _process_fields($fields)
 63	{
 64		$current_field_count = 0;
 65		$sql = '';
 66
 67		foreach ($fields as $field=>$attributes)
 68		{
 69			// Numeric field names aren't allowed in databases, so if the key is
 70			// numeric, we know it was assigned by PHP and the developer manually
 71			// entered the field information, so we'll simply add it to the list
 72			if (is_numeric($field))
 73			{
 74				$sql .= "\n\t$attributes";
 75			}
 76			else
 77			{
 78				$attributes = array_change_key_case($attributes, CASE_UPPER);
 79				
 80				$sql .= "\n\t".$this->db->_protect_identifiers($field);
 81
 82				if (array_key_exists('NAME', $attributes))
 83				{
 84					$sql .= ' '.$this->db->_protect_identifiers($attributes['NAME']).' ';
 85				}
 86				
 87				if (array_key_exists('TYPE', $attributes))
 88				{
 89					$sql .=  ' '.$attributes['TYPE'];
 90				}
 91	
 92				if (array_key_exists('CONSTRAINT', $attributes))
 93				{
 94					$sql .= '('.$attributes['CONSTRAINT'].')';
 95				}
 96	
 97				if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)
 98				{
 99					$sql .= ' UNSIGNED';
100				}
101	
102				if (array_key_exists('DEFAULT', $attributes))
103				{
104					$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
105				}
106	
107				if (array_key_exists('NULL', $attributes))
108				{
109					$sql .= ($attributes['NULL'] === TRUE) ? ' NULL' : ' NOT NULL';
110				}
111	
112				if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)
113				{
114					$sql .= ' AUTO_INCREMENT';
115				}
116			}
117			
118			// don't add a comma on the end of the last field
119			if (++$current_field_count < count($fields))
120			{
121				$sql .= ',';
122			}
123		}
124		
125		return $sql;
126	}
127
128	// --------------------------------------------------------------------
129
130	/**
131	 * Create Table
132	 *
133	 * @access	private
134	 * @param	string	the table name
135	 * @param	mixed	the fields
136	 * @param	mixed	primary key(s)
137	 * @param	mixed	key(s)
138	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL
139	 * @return	bool
140	 */
141	function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
142	{
143		$sql = 'CREATE TABLE ';
144		
145		if ($if_not_exists === TRUE)
146		{
147			$sql .= 'IF NOT EXISTS ';
148		}
149		
150		$sql .= $this->db->_escape_identifiers($table)." (";
151
152		$sql .= $this->_process_fields($fields);
153
154		if (count($primary_keys) > 0)
155		{
156			$key_name = $this->db->_protect_identifiers(implode('_', $primary_keys));
157			$primary_keys = $this->db->_protect_identifiers($primary_keys);
158			$sql .= ",\n\tPRIMARY KEY ".$key_name." (" . implode(', ', $primary_keys) . ")";
159		}
160
161		if (is_array($keys) && count($keys) > 0)
162		{
163			foreach ($keys as $key)
164			{
165				if (is_array($key))
166				{
167					$key_name = $this->db->_protect_identifiers(implode('_', $key));
168					$key = $this->db->_protect_identifiers($key);	
169				}
170				else
171				{
172					$key_name = $this->db->_protect_identifiers($key);
173					$key = array($key_name);
174				}
175				
176				$sql .= ",\n\tKEY {$key_name} (" . implode(', ', $key) . ")";
177			}
178		}
179
180		$sql .= "\n) DEFAULT CHARACTER SET {$this->db->char_set} COLLATE {$this->db->dbcollat};";
181
182		return $sql;
183	}
184
185	// --------------------------------------------------------------------
186
187	/**
188	 * Drop Table
189	 *
190	 * @access	private
191	 * @return	string
192	 */
193	function _drop_table($table)
194	{
195		return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table);
196	}
197
198	// --------------------------------------------------------------------
199
200	/**
201	 * Alter table query
202	 *
203	 * Generates a platform-specific query so that a table can be altered
204	 * Called by add_column(), drop_column(), and column_alter(),
205	 *
206	 * @access	private
207	 * @param	string	the ALTER type (ADD, DROP, CHANGE)
208	 * @param	string	the column name
209	 * @param	array	fields
210	 * @param	string	the field after which we should add the new field
211	 * @return	object
212	 */
213	function _alter_table($alter_type, $table, $fields, $after_field = '')
214	{
215		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ";
216
217		// DROP has everything it needs now.
218		if ($alter_type == 'DROP')
219		{
220			return $sql.$this->db->_protect_identifiers($fields);
221		}
222
223		$sql .= $this->_process_fields($fields);
224
225		if ($after_field != '')
226		{
227			$sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
228		}
229		
230		return $sql;
231	}
232
233	// --------------------------------------------------------------------
234
235	/**
236	 * Rename a table
237	 *
238	 * Generates a platform-specific query so that a table can be renamed
239	 *
240	 * @access	private
241	 * @param	string	the old table name
242	 * @param	string	the new table name
243	 * @return	string
244	 */
245	function _rename_table($table_name, $new_table_name)
246	{
247		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
248		return $sql;
249	}
250
251}
252
253/* End of file mysqli_forge.php */
254/* Location: ./system/database/drivers/mysqli/mysqli_forge.php */