summaryrefslogtreecommitdiffstats
path: root/system/database/drivers/mysql/mysql_forge.php
blob: ccacf99f83db5b03789a971b879537a22c8d4b68 (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
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2010, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

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

/**
 * MySQL Forge Class
 *
 * @category	Database
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
class CI_DB_mysql_forge extends CI_DB_forge {
	
	/**
	 * Create database
	 *
	 * @access	private
	 * @param	string	the database name
	 * @return	bool
	 */
	function _create_database($name)
	{
		return "CREATE DATABASE ".$name;
	}

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

	/**
	 * Drop database
	 *
	 * @access	private
	 * @param	string	the database name
	 * @return	bool
	 */
	function _drop_database($name)
	{
		return "DROP DATABASE ".$name;
	}

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

	/**
	 * Process Fields
	 *
	 * @access	private
	 * @param	mixed	the fields
	 * @return	string
	 */
	function _process_fields($fields)
	{
		$current_field_count = 0;
		$sql = '';

		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
			{
				$attributes = array_change_key_case($attributes, CASE_UPPER);
				
				$sql .= "\n\t".$this->db->_protect_identifiers($field);

				if (array_key_exists('NAME', $attributes))
				{
					$sql .= ' '.$this->db->_protect_identifiers($attributes['NAME']).' ';
				}
				
				if (array_key_exists('TYPE', $attributes))
				{
					$sql .=  ' '.$attributes['TYPE'];
				}
	
				if (array_key_exists('CONSTRAINT', $attributes))
				{
					$sql .= '('.$attributes['CONSTRAINT'].')';
				}
	
				if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)
				{
					$sql .= ' UNSIGNED';
				}
	
				if (array_key_exists('DEFAULT', $attributes))
				{
					$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
				}
	
				if (array_key_exists('NULL', $attributes))
				{
					$sql .= ($attributes['NULL'] === TRUE) ? ' NULL' : ' NOT NULL';
				}
	
				if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)
				{
					$sql .= ' AUTO_INCREMENT';
				}
			}
			
			// don't add a comma on the end of the last field
			if (++$current_field_count < count($fields))
			{
				$sql .= ',';
			}
		}
		
		return $sql;
	}

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

	/**
	 * Create Table
	 *
	 * @access	private
	 * @param	string	the table name
	 * @param	mixed	the fields
	 * @param	mixed	primary key(s)
	 * @param	mixed	key(s)
	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL
	 * @return	bool
	 */
	function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
	{
		$sql = 'CREATE TABLE ';
		
		if ($if_not_exists === TRUE)
		{
			$sql .= 'IF NOT EXISTS ';
		}
		
		$sql .= $this->db->_escape_identifiers($table)." (";

		$sql .= $this->_process_fields($fields);

		if (count($primary_keys) > 0)
		{
			$key_name = $this->db->_protect_identifiers(implode('_', $primary_keys));
			$primary_keys = $this->db->_protect_identifiers($primary_keys);
			$sql .= ",\n\tPRIMARY KEY ".$key_name." (" . implode(', ', $primary_keys) . ")";
		}

		if (is_array($keys) && count($keys) > 0)
		{
			foreach ($keys as $key)
			{
				if (is_array($key))
				{
					$key_name = $this->db->_protect_identifiers(implode('_', $key));
					$key = $this->db->_protect_identifiers($key);	
				}
				else
				{
					$key_name = $this->db->_protect_identifiers($key);
					$key = array($key_name);
				}
				
				$sql .= ",\n\tKEY {$key_name} (" . implode(', ', $key) . ")";
			}
		}

		$sql .= "\n) DEFAULT CHARACTER SET {$this->db->char_set} COLLATE {$this->db->dbcollat};";

		return $sql;
	}

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

	/**
	 * Drop Table
	 *
	 * @access	private
	 * @return	string
	 */
	function _drop_table($table)
	{
		return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table);
	}

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

	/**
	 * Alter table query
	 *
	 * Generates a platform-specific query so that a table can be altered
	 * Called by add_column(), drop_column(), and column_alter(),
	 *
	 * @access	private
	 * @param	string	the ALTER type (ADD, DROP, CHANGE)
	 * @param	string	the column name
	 * @param	array	fields
	 * @param	string	the field after which we should add the new field
	 * @return	object
	 */
	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);
		}

		$sql .= $this->_process_fields($fields);

		if ($after_field != '')
		{
			$sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
		}
		
		return $sql;
	}

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

	/**
	 * Rename a table
	 *
	 * Generates a platform-specific query so that a table can be renamed
	 *
	 * @access	private
	 * @param	string	the old table name
	 * @param	string	the new table name
	 * @return	string
	 */
	function _rename_table($table_name, $new_table_name)
	{
		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
		return $sql;
	}

}

/* End of file mysql_forge.php */
/* Location: ./system/database/drivers/mysql/mysql_forge.php */