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/halogy/database/drivers/sqlite/sqlite_forge.php

https://bitbucket.org/haloweb/halogy-1.0/
PHP | 265 lines | 131 code | 36 blank | 98 comment | 27 complexity | 14af6b6651626c9b1c94af7a766393f7 MD5 | raw file
  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 * SQLite Forge Class
 20 *
 21 * @category	Database
 22 * @author		ExpressionEngine Dev Team
 23 * @link		http://codeigniter.com/user_guide/database/
 24 */
 25class CI_DB_sqlite_forge extends CI_DB_forge {
 26
 27	/**
 28	 * Create database
 29	 *
 30	 * @access	public
 31	 * @param	string	the database name
 32	 * @return	bool
 33	 */
 34	function _create_database()
 35	{
 36		// In SQLite, a database is created when you connect to the database.
 37		// We'll return TRUE so that an error isn't generated
 38		return TRUE;
 39	}
 40
 41	// --------------------------------------------------------------------
 42
 43	/**
 44	 * Drop database
 45	 *
 46	 * @access	private
 47	 * @param	string	the database name
 48	 * @return	bool
 49	 */
 50	function _drop_database($name)
 51	{
 52		if ( ! @file_exists($this->db->database) OR ! @unlink($this->db->database))
 53		{
 54			if ($this->db->db_debug)
 55			{
 56				return $this->db->display_error('db_unable_to_drop');
 57			}
 58			return FALSE;
 59		}
 60		return TRUE;
 61	}
 62	// --------------------------------------------------------------------
 63
 64	/**
 65	 * Create Table
 66	 *
 67	 * @access	private
 68	 * @param	string	the table name
 69	 * @param	array	the fields
 70	 * @param	mixed	primary key(s)
 71	 * @param	mixed	key(s)
 72	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL
 73	 * @return	bool
 74	 */
 75	function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
 76	{
 77		$sql = 'CREATE TABLE ';
 78		
 79		// IF NOT EXISTS added to SQLite in 3.3.0
 80		if ($if_not_exists === TRUE && version_compare($this->_version(), '3.3.0', '>=') === TRUE)
 81		{
 82			$sql .= 'IF NOT EXISTS ';
 83		}
 84		
 85		$sql .= $this->db->_escape_identifiers($table)."(";
 86		$current_field_count = 0;
 87
 88		foreach ($fields as $field=>$attributes)
 89		{
 90			// Numeric field names aren't allowed in databases, so if the key is
 91			// numeric, we know it was assigned by PHP and the developer manually
 92			// entered the field information, so we'll simply add it to the list
 93			if (is_numeric($field))
 94			{
 95				$sql .= "\n\t$attributes";
 96			}
 97			else
 98			{
 99				$attributes = array_change_key_case($attributes, CASE_UPPER);
100				
101				$sql .= "\n\t".$this->db->_protect_identifiers($field);
102				
103				$sql .=  ' '.$attributes['TYPE'];
104	
105				if (array_key_exists('CONSTRAINT', $attributes))
106				{
107					$sql .= '('.$attributes['CONSTRAINT'].')';
108				}
109	
110				if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)
111				{
112					$sql .= ' UNSIGNED';
113				}
114	
115				if (array_key_exists('DEFAULT', $attributes))
116				{
117					$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
118				}
119	
120				if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)
121				{
122					$sql .= ' NULL';
123				}
124				else
125				{
126					$sql .= ' NOT NULL';			
127				}
128	
129				if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)
130				{
131					$sql .= ' AUTO_INCREMENT';
132				}
133			}
134			
135			// don't add a comma on the end of the last field
136			if (++$current_field_count < count($fields))
137			{
138				$sql .= ',';
139			}
140		}
141
142		if (count($primary_keys) > 0)
143		{
144			$primary_keys = $this->db->_protect_identifiers($primary_keys);
145			$sql .= ",\n\tPRIMARY KEY (" . implode(', ', $primary_keys) . ")";
146		}
147
148		if (is_array($keys) && count($keys) > 0)
149		{
150			foreach ($keys as $key)
151			{
152				if (is_array($key))
153				{
154					$key = $this->db->_protect_identifiers($key);	
155				}
156				else
157				{
158					$key = array($this->db->_protect_identifiers($key));
159				}
160				
161				$sql .= ",\n\tUNIQUE (" . implode(', ', $key) . ")";
162			}
163		}
164
165		$sql .= "\n)";
166
167		return $sql;
168	}
169
170	// --------------------------------------------------------------------
171
172	/**
173	 * Drop Table
174	 *
175	 *  Unsupported feature in SQLite
176	 *
177	 * @access	private
178	 * @return	bool
179	 */
180	function _drop_table($table)
181	{
182		if ($this->db->db_debug)
183		{
184			return $this->db->display_error('db_unsuported_feature');
185		}
186		return array();
187	}
188
189	// --------------------------------------------------------------------
190
191	/**
192	 * Alter table query
193	 *
194	 * Generates a platform-specific query so that a table can be altered
195	 * Called by add_column(), drop_column(), and column_alter(),
196	 *
197	 * @access	private
198	 * @param	string	the ALTER type (ADD, DROP, CHANGE)
199	 * @param	string	the column name
200	 * @param	string	the table name
201	 * @param	string	the column definition
202	 * @param	string	the default value
203	 * @param	boolean	should 'NOT NULL' be added
204	 * @param	string	the field after which we should add the new field
205	 * @return	object
206	 */
207	function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')
208	{
209		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ".$this->db->_protect_identifiers($column_name);
210
211		// DROP has everything it needs now.
212		if ($alter_type == 'DROP')
213		{
214			// SQLite does not support dropping columns
215			// http://www.sqlite.org/omitted.html
216			// http://www.sqlite.org/faq.html#q11
217			return FALSE;
218		}
219
220		$sql .= " $column_definition";
221
222		if ($default_value != '')
223		{
224			$sql .= " DEFAULT \"$default_value\"";
225		}
226
227		if ($null === NULL)
228		{
229			$sql .= ' NULL';
230		}
231		else
232		{
233			$sql .= ' NOT NULL';
234		}
235
236		if ($after_field != '')
237		{
238			$sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
239		}
240		
241		return $sql;
242		
243	}
244
245	// --------------------------------------------------------------------
246
247	/**
248	 * Rename a table
249	 *
250	 * Generates a platform-specific query so that a table can be renamed
251	 *
252	 * @access	private
253	 * @param	string	the old table name
254	 * @param	string	the new table name
255	 * @return	string
256	 */
257	function _rename_table($table_name, $new_table_name)
258	{
259		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
260		return $sql;
261	}
262}
263
264/* End of file sqlite_forge.php */
265/* Location: ./system/database/drivers/sqlite/sqlite_forge.php */