/halogy/database/drivers/mssql/mssql_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 4.3.2 or newer
  6 *
  7 * @package		CodeIgniter
  8 * @author		ExpressionEngine Dev Team
  9 * @copyright	Copyright (c) 2008 - 2009, 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 * MS SQL Forge Class
 20 *
 21 * @category	Database
 22 * @author		ExpressionEngine Dev Team
 23 * @link		http://codeigniter.com/user_guide/database/
 24 */
 25class CI_DB_mssql_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	 * Drop Table
 57	 *
 58	 * @access	private
 59	 * @return	bool
 60	 */
 61	function _drop_table($table)
 62	{
 63		return "DROP TABLE ".$this->db->_escape_identifiers($table);
 64	}
 65
 66	// --------------------------------------------------------------------
 67
 68	/**
 69	 * Create Table
 70	 *
 71	 * @access	private
 72	 * @param	string	the table name
 73	 * @param	array	the fields
 74	 * @param	mixed	primary key(s)
 75	 * @param	mixed	key(s)
 76	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL
 77	 * @return	bool
 78	 */
 79	function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
 80	{
 81		$sql = 'CREATE TABLE ';
 82		
 83		if ($if_not_exists === TRUE)
 84		{
 85			$sql .= 'IF NOT EXISTS ';
 86		}
 87		
 88		$sql .= $this->db->_escape_identifiers($table)." (";
 89		$current_field_count = 0;
 90
 91		foreach ($fields as $field=>$attributes)
 92		{
 93			// Numeric field names aren't allowed in databases, so if the key is
 94			// numeric, we know it was assigned by PHP and the developer manually
 95			// entered the field information, so we'll simply add it to the list
 96			if (is_numeric($field))
 97			{
 98				$sql .= "\n\t$attributes";
 99			}
100			else
101			{
102				$attributes = array_change_key_case($attributes, CASE_UPPER);
103				
104				$sql .= "\n\t".$this->db->_protect_identifiers($field);
105				
106				$sql .=  ' '.$attributes['TYPE'];
107	
108				if (array_key_exists('CONSTRAINT', $attributes))
109				{
110					$sql .= '('.$attributes['CONSTRAINT'].')';
111				}
112	
113				if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)
114				{
115					$sql .= ' UNSIGNED';
116				}
117	
118				if (array_key_exists('DEFAULT', $attributes))
119				{
120					$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
121				}
122	
123				if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)
124				{
125					$sql .= ' NULL';
126				}
127				else
128				{
129					$sql .= ' NOT NULL';			
130				}
131	
132				if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)
133				{
134					$sql .= ' AUTO_INCREMENT';
135				}
136			}
137			
138			// don't add a comma on the end of the last field
139			if (++$current_field_count < count($fields))
140			{
141				$sql .= ',';
142			}
143		}
144
145		if (count($primary_keys) > 0)
146		{
147			$primary_keys = $this->db->_protect_identifiers($primary_keys);
148			$sql .= ",\n\tPRIMARY KEY (" . implode(', ', $primary_keys) . ")";
149		}
150		
151		if (is_array($keys) && count($keys) > 0)
152		{
153			foreach ($keys as $key)
154			{
155				if (is_array($key))
156				{
157					$key = $this->db->_protect_identifiers($key);	
158				}
159				else
160				{
161					$key = array($this->db->_protect_identifiers($key));
162				}
163				
164				$sql .= ",\n\tFOREIGN KEY (" . implode(', ', $key) . ")";
165			}
166		}
167		
168		$sql .= "\n)";
169
170		return $sql;
171	}
172
173	// --------------------------------------------------------------------
174
175	/**
176	 * Alter table query
177	 *
178	 * Generates a platform-specific query so that a table can be altered
179	 * Called by add_column(), drop_column(), and column_alter(),
180	 *
181	 * @access	private
182	 * @param	string	the ALTER type (ADD, DROP, CHANGE)
183	 * @param	string	the column name
184	 * @param	string	the table name
185	 * @param	string	the column definition
186	 * @param	string	the default value
187	 * @param	boolean	should 'NOT NULL' be added
188	 * @param	string	the field after which we should add the new field
189	 * @return	object
190	 */
191	function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')
192	{
193		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ".$this->db->_protect_identifiers($column_name);
194
195		// DROP has everything it needs now.
196		if ($alter_type == 'DROP')
197		{
198			return $sql;
199		}
200
201		$sql .= " $column_definition";
202
203		if ($default_value != '')
204		{
205			$sql .= " DEFAULT \"$default_value\"";
206		}
207
208		if ($null === NULL)
209		{
210			$sql .= ' NULL';
211		}
212		else
213		{
214			$sql .= ' NOT NULL';
215		}
216
217		if ($after_field != '')
218		{
219			$sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
220		}
221		
222		return $sql;
223		
224	}
225
226	// --------------------------------------------------------------------
227
228	/**
229	 * Rename a table
230	 *
231	 * Generates a platform-specific query so that a table can be renamed
232	 *
233	 * @access	private
234	 * @param	string	the old table name
235	 * @param	string	the new table name
236	 * @return	string
237	 */
238	function _rename_table($table_name, $new_table_name)
239	{
240		// I think this syntax will work, but can find little documentation on renaming tables in MSSQL
241		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
242		return $sql;
243	}
244
245}
246
247/* End of file mssql_forge.php */
248/* Location: ./system/database/drivers/mssql/mssql_forge.php */