<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* MySQLi Forge Class
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*
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* @category Database
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/database/
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*/
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class CI_DB_mysqli_forge extends CI_DB_forge {
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/**
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* Create database
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*
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* @access private
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* @param string the database name
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* @return bool
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*/
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function _create_database($name)
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{
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return "CREATE DATABASE ".$name;
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}
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// --------------------------------------------------------------------
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/**
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* Drop database
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*
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* @access private
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* @param string the database name
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* @return bool
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*/
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function _drop_database($name)
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{
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return "DROP DATABASE ".$name;
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}
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// --------------------------------------------------------------------
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/**
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* Process Fields
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*
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* @access private
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* @param mixed the fields
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* @return string
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*/
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function _process_fields($fields)
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{
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$current_field_count = 0;
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$sql = '';
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foreach ($fields as $field=>$attributes)
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{
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// Numeric field names aren't allowed in databases, so if the key is
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// numeric, we know it was assigned by PHP and the developer manually
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// entered the field information, so we'll simply add it to the list
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if (is_numeric($field))
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{
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$sql .= "\n\t$attributes";
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}
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else
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{
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$attributes = array_change_key_case($attributes, CASE_UPPER);
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$sql .= "\n\t".$this->db->_protect_identifiers($field);
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if (array_key_exists('NAME', $attributes))
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{
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$sql .= ' '.$this->db->_protect_identifiers($attributes['NAME']).' ';
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}
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if (array_key_exists('TYPE', $attributes))
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{
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$sql .= ' '.$attributes['TYPE'];
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}
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if (array_key_exists('CONSTRAINT', $attributes))
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{
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$sql .= '('.$attributes['CONSTRAINT'].')';
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}
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if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)
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{
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$sql .= ' UNSIGNED';
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}
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if (array_key_exists('DEFAULT', $attributes))
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{
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$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
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}
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if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)
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{
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$sql .= ' NULL';
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}
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else
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{
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$sql .= ' NOT NULL';
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}
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if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)
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{
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$sql .= ' AUTO_INCREMENT';
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}
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}
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// don't add a comma on the end of the last field
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if (++$current_field_count < count($fields))
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{
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$sql .= ',';
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}
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Create Table
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*
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* @access private
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* @param string the table name
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* @param mixed the fields
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* @param mixed primary key(s)
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* @param mixed key(s)
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* @param boolean should 'IF NOT EXISTS' be added to the SQL
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* @return bool
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*/
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function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
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{
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$sql = 'CREATE TABLE ';
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if ($if_not_exists === TRUE)
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{
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$sql .= 'IF NOT EXISTS ';
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}
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$sql .= $this->db->_escape_identifiers($table)." (";
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$sql .= $this->_process_fields($fields);
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if (count($primary_keys) > 0)
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{
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$key_name = $this->db->_protect_identifiers(implode('_', $primary_keys));
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$primary_keys = $this->db->_protect_identifiers($primary_keys);
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$sql .= ",\n\tPRIMARY KEY ".$key_name." (" . implode(', ', $primary_keys) . ")";
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}
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if (is_array($keys) && count($keys) > 0)
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{
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foreach ($keys as $key)
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{
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if (is_array($key))
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{
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$key_name = $this->db->_protect_identifiers(implode('_', $key));
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$key = $this->db->_protect_identifiers($key);
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}
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else
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{
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$key_name = $this->db->_protect_identifiers($key);
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$key = array($key_name);
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}
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$sql .= ",\n\tKEY {$key_name} (" . implode(', ', $key) . ")";
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}
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}
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$sql .= "\n) DEFAULT CHARACTER SET {$this->db->char_set} COLLATE {$this->db->dbcollat};";
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Drop Table
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*
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* @access private
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* @return string
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*/
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function _drop_table($table)
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{
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return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table);
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}
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// --------------------------------------------------------------------
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/**
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* Alter table query
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*
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* Generates a platform-specific query so that a table can be altered
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* Called by add_column(), drop_column(), and column_alter(),
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*
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* @access private
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* @param string the ALTER type (ADD, DROP, CHANGE)
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* @param string the column name
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* @param array fields
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* @param string the field after which we should add the new field
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* @return object
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*/
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function _alter_table($alter_type, $table, $fields, $after_field = '')
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{
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$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ";
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// DROP has everything it needs now.
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if ($alter_type == 'DROP')
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{
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return $sql.$this->db->_protect_identifiers($fields);
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}
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$sql .= $this->_process_fields($fields);
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if ($after_field != '')
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{
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$sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Rename a table
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*
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* Generates a platform-specific query so that a table can be renamed
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*
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* @access private
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* @param string the old table name
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* @param string the new table name
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* @return string
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*/
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function _rename_table($table_name, $new_table_name)
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{
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$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
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return $sql;
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}
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}
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/* End of file mysqli_forge.php */
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/* Location: ./system/database/drivers/mysqli/mysqli_forge.php */
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