shiftcontroller / happ / system / database / drivers / sqlite / sqlite_forge.php

sqlite_forge.php in ShiftController Employee Shift Scheduling 2.1.0, at happ/system/database/drivers/sqlite/sqlite_forge.php

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1	<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
2	/**
3	* CodeIgniter
4	*
5	* An open source application development framework for PHP 5.1.6 or newer
6	*
7	* @package CodeIgniter
8	* @author ExpressionEngine Dev Team
9	* @copyright Copyright (c) 2008 - 2011, 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	*/
25	class 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->db->_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 */