video/system/database/drivers/mysqli/mysqli_forge.php

   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  * MySQLi Forge Class
  20  *
  21  * @category    Database
  22  * @author              ExpressionEngine Dev Team
  23  * @link                http://codeigniter.com/user_guide/database/
  24  */
  25 class CI_DB_mysqli_forge extends CI_DB_forge {
  26
  27         /**
  28          * Create database
  29          *
  30          * @access      private
  31          * @param       string  the database name
  32          * @return      bool
  33          */
  34         function _create_database($name)
  35         {
  36                 return "CREATE DATABASE ".$name;
  37         }
  38
  39         // --------------------------------------------------------------------
  40
  41         /**
  42          * Drop database
  43          *
  44          * @access      private
  45          * @param       string  the database name
  46          * @return      bool
  47          */
  48         function _drop_database($name)
  49         {
  50                 return "DROP DATABASE ".$name;
  51         }
  52
  53         // --------------------------------------------------------------------
  54
  55         /**
  56          * Process Fields
  57          *
  58          * @access      private
  59          * @param       mixed   the fields
  60          * @return      string
  61          */
  62         function _process_fields($fields)
  63         {
  64                 $current_field_count = 0;
  65                 $sql = '';
  66
  67                 foreach ($fields as $field=>$attributes)
  68                 {
  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))
  73                         {
  74                                 $sql .= "\n\t$attributes";
  75                         }
  76                         else
  77                         {
  78                                 $attributes = array_change_key_case($attributes, CASE_UPPER);
  79
  80                                 $sql .= "\n\t".$this->db->_protect_identifiers($field);
  81
  82                                 if (array_key_exists('NAME', $attributes))
  83                                 {
  84                                         $sql .= ' '.$this->db->_protect_identifiers($attributes['NAME']).' ';
  85                                 }
  86
  87                                 if (array_key_exists('TYPE', $attributes))
  88                                 {
  89                                         $sql .=  ' '.$attributes['TYPE'];
  90                                 }
  91
  92                                 if (array_key_exists('CONSTRAINT', $attributes))
  93                                 {
  94                                         $sql .= '('.$attributes['CONSTRAINT'].')';
  95                                 }
  96
  97                                 if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)
  98                                 {
  99                                         $sql .= ' UNSIGNED';
 100                                 }
 101
 102                                 if (array_key_exists('DEFAULT', $attributes))
 103                                 {
 104                                         $sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
 105                                 }
 106
 107                                 if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)
 108                                 {
 109                                         $sql .= ' NULL';
 110                                 }
 111                                 else
 112                                 {
 113                                         $sql .= ' NOT NULL';
 114                                 }
 115
 116                                 if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)
 117                                 {
 118                                         $sql .= ' AUTO_INCREMENT';
 119                                 }
 120                         }
 121
 122                         // don't add a comma on the end of the last field
 123                         if (++$current_field_count < count($fields))
 124                         {
 125                                 $sql .= ',';
 126                         }
 127                 }
 128
 129                 return $sql;
 130         }
 131
 132         // --------------------------------------------------------------------
 133
 134         /**
 135          * Create Table
 136          *
 137          * @access      private
 138          * @param       string  the table name
 139          * @param       mixed   the fields
 140          * @param       mixed   primary key(s)
 141          * @param       mixed   key(s)
 142          * @param       boolean should 'IF NOT EXISTS' be added to the SQL
 143          * @return      bool
 144          */
 145         function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
 146         {
 147                 $sql = 'CREATE TABLE ';
 148
 149                 if ($if_not_exists === TRUE)
 150                 {
 151                         $sql .= 'IF NOT EXISTS ';
 152                 }
 153
 154                 $sql .= $this->db->_escape_identifiers($table)." (";
 155
 156                 $sql .= $this->_process_fields($fields);
 157
 158                 if (count($primary_keys) > 0)
 159                 {
 160                         $key_name = $this->db->_protect_identifiers(implode('_', $primary_keys));
 161                         $primary_keys = $this->db->_protect_identifiers($primary_keys);
 162                         $sql .= ",\n\tPRIMARY KEY ".$key_name." (" . implode(', ', $primary_keys) . ")";
 163                 }
 164
 165                 if (is_array($keys) && count($keys) > 0)
 166                 {
 167                         foreach ($keys as $key)
 168                         {
 169                                 if (is_array($key))
 170                                 {
 171                                         $key_name = $this->db->_protect_identifiers(implode('_', $key));
 172                                         $key = $this->db->_protect_identifiers($key);
 173                                 }
 174                                 else
 175                                 {
 176                                         $key_name = $this->db->_protect_identifiers($key);
 177                                         $key = array($key_name);
 178                                 }
 179
 180                                 $sql .= ",\n\tKEY {$key_name} (" . implode(', ', $key) . ")";
 181                         }
 182                 }
 183
 184                 $sql .= "\n) DEFAULT CHARACTER SET {$this->db->char_set} COLLATE {$this->db->dbcollat};";
 185
 186                 return $sql;
 187         }
 188
 189         // --------------------------------------------------------------------
 190
 191         /**
 192          * Drop Table
 193          *
 194          * @access      private
 195          * @return      string
 196          */
 197         function _drop_table($table)
 198         {
 199                 return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table);
 200         }
 201
 202         // --------------------------------------------------------------------
 203
 204         /**
 205          * Alter table query
 206          *
 207          * Generates a platform-specific query so that a table can be altered
 208          * Called by add_column(), drop_column(), and column_alter(),
 209          *
 210          * @access      private
 211          * @param       string  the ALTER type (ADD, DROP, CHANGE)
 212          * @param       string  the column name
 213          * @param       array   fields
 214          * @param       string  the field after which we should add the new field
 215          * @return      object
 216          */
 217         function _alter_table($alter_type, $table, $fields, $after_field = '')
 218         {
 219                 $sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ";
 220
 221                 // DROP has everything it needs now.
 222                 if ($alter_type == 'DROP')
 223                 {
 224                         return $sql.$this->db->_protect_identifiers($fields);
 225                 }
 226
 227                 $sql .= $this->_process_fields($fields);
 228
 229                 if ($after_field != '')
 230                 {
 231                         $sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
 232                 }
 233
 234                 return $sql;
 235         }
 236
 237         // --------------------------------------------------------------------
 238
 239         /**
 240          * Rename a table
 241          *
 242          * Generates a platform-specific query so that a table can be renamed
 243          *
 244          * @access      private
 245          * @param       string  the old table name
 246          * @param       string  the new table name
 247          * @return      string
 248          */
 249         function _rename_table($table_name, $new_table_name)
 250         {
 251                 $sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
 252                 return $sql;
 253         }
 254
 255 }
 256
 257 /* End of file mysqli_forge.php */
 258 /* Location: ./system/database/drivers/mysqli/mysqli_forge.php */