1 <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
5 * An open source application development framework for PHP 5.1.6 or newer
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
16 // ------------------------------------------------------------------------
22 * @author ExpressionEngine Dev Team
23 * @link http://codeigniter.com/user_guide/database/
25 class CI_DB_mysql_forge extends CI_DB_forge {
31 * @param string the database name
34 function _create_database($name)
36 return "CREATE DATABASE ".$name;
39 // --------------------------------------------------------------------
45 * @param string the database name
48 function _drop_database($name)
50 return "DROP DATABASE ".$name;
53 // --------------------------------------------------------------------
59 * @param mixed the fields
62 function _process_fields($fields)
64 $current_field_count = 0;
67 foreach ($fields as $field=>$attributes)
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))
74 $sql .= "\n\t$attributes";
78 $attributes = array_change_key_case($attributes, CASE_UPPER);
80 $sql .= "\n\t".$this->db->_protect_identifiers($field);
82 if (array_key_exists('NAME', $attributes))
84 $sql .= ' '.$this->db->_protect_identifiers($attributes['NAME']).' ';
87 if (array_key_exists('TYPE', $attributes))
89 $sql .= ' '.$attributes['TYPE'];
91 if (array_key_exists('CONSTRAINT', $attributes))
93 switch ($attributes['TYPE'])
98 $sql .= '('.implode(',', $attributes['CONSTRAINT']).')';
103 $sql .= '("'.implode('","', $attributes['CONSTRAINT']).'")';
107 $sql .= '('.$attributes['CONSTRAINT'].')';
112 if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)
117 if (array_key_exists('DEFAULT', $attributes))
119 $sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
122 if (array_key_exists('NULL', $attributes))
124 $sql .= ($attributes['NULL'] === TRUE) ? ' NULL' : ' NOT NULL';
127 if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)
129 $sql .= ' AUTO_INCREMENT';
133 // don't add a comma on the end of the last field
134 if (++$current_field_count < count($fields))
143 // --------------------------------------------------------------------
149 * @param string the table name
150 * @param mixed the fields
151 * @param mixed primary key(s)
152 * @param mixed key(s)
153 * @param boolean should 'IF NOT EXISTS' be added to the SQL
156 function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
158 $sql = 'CREATE TABLE ';
160 if ($if_not_exists === TRUE)
162 $sql .= 'IF NOT EXISTS ';
165 $sql .= $this->db->_escape_identifiers($table)." (";
167 $sql .= $this->_process_fields($fields);
169 if (count($primary_keys) > 0)
171 $key_name = $this->db->_protect_identifiers(implode('_', $primary_keys));
172 $primary_keys = $this->db->_protect_identifiers($primary_keys);
173 $sql .= ",\n\tPRIMARY KEY ".$key_name." (" . implode(', ', $primary_keys) . ")";
176 if (is_array($keys) && count($keys) > 0)
178 foreach ($keys as $key)
182 $key_name = $this->db->_protect_identifiers(implode('_', $key));
183 $key = $this->db->_protect_identifiers($key);
187 $key_name = $this->db->_protect_identifiers($key);
188 $key = array($key_name);
191 $sql .= ",\n\tKEY {$key_name} (" . implode(', ', $key) . ")";
195 $sql .= "\n) DEFAULT CHARACTER SET {$this->db->char_set} COLLATE {$this->db->dbcollat};";
200 // --------------------------------------------------------------------
208 function _drop_table($table)
210 return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table);
213 // --------------------------------------------------------------------
218 * Generates a platform-specific query so that a table can be altered
219 * Called by add_column(), drop_column(), and column_alter(),
222 * @param string the ALTER type (ADD, DROP, CHANGE)
223 * @param string the column name
224 * @param array fields
225 * @param string the field after which we should add the new field
228 function _alter_table($alter_type, $table, $fields, $after_field = '')
230 $sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ";
232 // DROP has everything it needs now.
233 if ($alter_type == 'DROP')
235 return $sql.$this->db->_protect_identifiers($fields);
238 $sql .= $this->_process_fields($fields);
240 if ($after_field != '')
242 $sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
248 // --------------------------------------------------------------------
253 * Generates a platform-specific query so that a table can be renamed
256 * @param string the old table name
257 * @param string the new table name
260 function _rename_table($table_name, $new_table_name)
262 $sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
268 /* End of file mysql_forge.php */
269 /* Location: ./system/database/drivers/mysql/mysql_forge.php */