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<?php
/**
* 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
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* 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 {
/**
* DROP TABLE statement
*
* @var string
*/
protected $_drop_table = 'DROP TABLE IF EXISTS %s CASCADE';
// --------------------------------------------------------------------
/**
* Process Fields
*
* @param mixed $fields
* @param array $primary_keys
* @return string
*/
protected function _process_fields($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->escape_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'].')';
}
if (isset($attributes['DEFAULT']))
{
$sql .= " DEFAULT '".$attributes['DEFAULT']."'";
}
$sql .= ( ! empty($attributes['NULL']) && $attributes['NULL'] === TRUE)
? ' NULL' : ' NOT NULL';
// Added new attribute to create unique fields. Also works with MySQL
if ( ! empty($attributes['UNIQUE']) && $attributes['UNIQUE'] === TRUE)
{
$sql .= ' UNIQUE';
}
}
// don't add a comma on the end of the last field
if (++$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)
{
$sql = 'CREATE TABLE ';
// PostgreSQL doesn't support IF NOT EXISTS syntax so we check if table exists manually
if ($if_not_exists === TRUE && $this->db->table_exists($table))
{
return TRUE;
}
$sql .= $this->db->escape_identifiers($table).' ('.$this->_process_fields($fields, $primary_keys);
if (count($primary_keys) > 0)
{
$sql .= ",\n\tPRIMARY KEY (".implode(', ', $this->db->escape_identifiers($primary_keys)).')';
}
$sql .= "\n);";
if (is_array($keys) && count($keys) > 0)
{
foreach ($keys as $key)
{
$key = is_array($key)
? $this->db->escape_identifiers($key)
: array($this->db->escape_identifiers($key));
foreach ($key as $field)
{
$sql .= "\nCREATE INDEX ".$this->db->escape_identifiers($table.'_'.str_replace(array('"', "'"), '', $field).'_index')
.' ON '.$this->db->escape_identifiers($table).' ('.$this->db->escape_identifiers($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 $alter_type the ALTER type (ADD, DROP, CHANGE)
* @param string $table the table name
* @param string $fields the column definition
* @param string $after_field
* @return string
*/
protected function _alter_table($alter_type, $table, $fields, $after_field = '')
{
$sql = 'ALTER TABLE '.$this->db->escape_identifiers($table).' '.$alter_type.' ';
// DROP has everything it needs now.
if ($alter_type === 'DROP')
{
return $sql.$this->db->escape_identifiers($fields);
}
return $sql.$this->_process_fields($fields)
.($after_field !== '' ? ' AFTER '.$this->db->escape_identifiers($after_field) : '');
}
}
/* End of file postgre_forge.php */
/* Location: ./system/database/drivers/postgre/postgre_forge.php */
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