summaryrefslogtreecommitdiffstats
path: root/system/database/drivers/postgre/postgre_forge.php
blob: af1c45f9bc7eb83cf309c846f16db0dc80d8feb1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
<?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
 */

/**
 * Postgre Forge Class
 *
 * @category	Database
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
class CI_DB_postgre_forge extends CI_DB_forge {

	protected $_drop_table	= 'DROP TABLE IF EXISTS %s CASCADE';

	/**
	 * Process Fields
	 *
	 * @param	mixed	the fields
	 * @return	string
	 */
	protected function _process_fields($fields, $primary_keys = array())
	{
		$sql = '';
		$current_field_count = 0;

		foreach ($fields as $field => $attributes)
		{
			// Numeric field names aren't allowed in databases, so if the key is
			// numeric, we know it was assigned by PHP and the developer manually
			// entered the field information, so we'll simply add it to the list
			if (is_numeric($field))
			{
				$sql .= "\n\t".$attributes;
			}
			else
			{
				$sql .= "\n\t".$this->db->protect_identifiers($field);

				$attributes = array_change_key_case($attributes, CASE_UPPER);
				$is_unsigned = ( ! empty($attributes['UNSIGNED']) && $attributes['UNSIGNED'] === TRUE);

				// Convert datatypes to be PostgreSQL-compatible
				switch (strtoupper($attributes['TYPE']))
				{
					case 'TINYINT':
						$attributes['TYPE'] = 'SMALLINT';
						break;
					case 'SMALLINT':
						$attributes['TYPE'] = ($is_unsigned) ? 'INTEGER' : 'SMALLINT';
						break;
					case 'MEDIUMINT':
						$attributes['TYPE'] = 'INTEGER';
						break;
					case 'INT':
						$attributes['TYPE'] = ($is_unsigned) ? 'BIGINT' : 'INTEGER';
						break;
					case 'BIGINT':
						$attributes['TYPE'] = ($is_unsigned) ? 'NUMERIC' : 'BIGINT';
						break;
					case 'DOUBLE':
						$attributes['TYPE'] = 'DOUBLE PRECISION';
						break;
					case 'DATETIME':
						$attributes['TYPE'] = 'TIMESTAMP';
						break;
					case 'LONGTEXT':
						$attributes['TYPE'] = 'TEXT';
						break;
					case 'BLOB':
						$attributes['TYPE'] = 'BYTEA';
						break;
					default:
						break;
				}

				// If this is an auto-incrementing primary key, use the serial data type instead
				$sql .= (in_array($field, $primary_keys) && ! empty($attributes['AUTO_INCREMENT']) && $attributes['AUTO_INCREMENT'] === TRUE)
					? ' SERIAL' : ' '.$attributes['TYPE'];

				// Modified to prevent constraints with integer data types
				if ( ! empty($attributes['CONSTRAINT']) && strpos($attributes['TYPE'], 'INT') === FALSE)
				{
					$sql .= '('.$attributes['CONSTRAINT'].')';
				}

				$sql .= (isset($attributes['DEFAULT']) ? " DEFAULT '".$attributes['DEFAULT']."'" : '')
					.(( ! empty($attributes['NULL']) && $attributes['NULL'] === TRUE) ? ' NULL' : ' NOT NULL')
					// Added new attribute to create unqite fields. Also works with MySQL
					.(( ! empty($attributes['UNIQUE']) && $attributes['UNIQUE'] === TRUE) ? ' UNIQUE' : '');
			}

			// don't add a comma on the end of the last field
			if (++$current_field_count < count($fields))
			{
				$sql .= ',';
			}
		}

		return $sql;
	}

	// --------------------------------------------------------------------

	/**
	 * Create Table
	 *
	 * @param	string	the table name
	 * @param	array	the fields
	 * @param	mixed	primary key(s)
	 * @param	mixed	key(s)
	 * @param	bool	should 'IF NOT EXISTS' be added to the SQL
	 * @return	bool
	 */
	protected function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
	{
		$sql = 'CREATE TABLE ';

		if ($if_not_exists === TRUE)
		{
			// PostgreSQL doesn't support IF NOT EXISTS syntax so we check if table exists manually
			if ($this->db->table_exists($table))
			{
				return TRUE;
			}
		}

		$sql .= $this->db->escape_identifiers($table).' ('.$this->_process_fields($fields, $primary_keys);

		if (count($primary_keys) > 0)
		{
			// Something seems to break when passing an array to protect_identifiers()
			foreach ($primary_keys as $index => $key)
			{
				$primary_keys[$index] = $this->db->protect_identifiers($key);
			}

			$sql .= ",\n\tPRIMARY KEY (".implode(', ', $primary_keys).')';
		}

		$sql .= "\n);";

		if (is_array($keys) && count($keys) > 0)
		{
			foreach ($keys as $key)
			{
				if (is_array($key))
				{
					$key = $this->db->protect_identifiers($key);
				}
				else
				{
					$key = array($this->db->protect_identifiers($key));
				}

				foreach ($key as $field)
				{
					$sql .= 'CREATE INDEX '.$table.'_'.str_replace(array('"', "'"), '', $field).'_index ON '.$table.' ('.$field.'); ';
				}
			}
		}

		return $sql;
	}

	// --------------------------------------------------------------------

	/**
	 * Alter table query
	 *
	 * Generates a platform-specific query so that a table can be altered
	 * Called by add_column(), drop_column(), and column_alter(),
	 *
	 * @param	string	the ALTER type (ADD, DROP, CHANGE)
	 * @param	string	the column name
	 * @param	string	the table name
	 * @param	string	the column definition
	 * @param	string	the default value
	 * @param	bool	should 'NOT NULL' be added
	 * @param	string	the field after which we should add the new field
	 * @return	string
	 */
	protected function _alter_table($alter_type, $table, $fields, $after_field = '')
 	{
 		$sql = 'ALTER TABLE '.$this->db->protect_identifiers($table).' '.$alter_type.' ';

 		// DROP has everything it needs now.
 		if ($alter_type === 'DROP')
 		{
 			return $sql.$this->db->protect_identifiers($fields);
 		}

 		return $sql.$this->_process_fields($fields)
			.($after_field !== '' ? ' AFTER '.$this->db->protect_identifiers($after_field) : '');
 	}

}

/* End of file postgre_forge.php */
/* Location: ./system/database/drivers/postgre/postgre_forge.php */