<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 5.1.6 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.

 * @license		http://codeigniter.com/user_guide/license.html

 * @link		http://codeigniter.com

 * @since		Version 1.0

 * @filesource

 */



// ------------------------------------------------------------------------



/**

 * Postgre Forge Class

 *

 * @category	Database

 * @author		ExpressionEngine Dev Team

 * @link		http://codeigniter.com/user_guide/database/

 */

class CI_DB_postgre_forge extends CI_DB_forge {



	/**

	 * Create database

	 *

	 * @access	private

	 * @param	string	the database name

	 * @return	bool

	 */

	function _create_database($name)

	{

		return "CREATE DATABASE ".$name;

	}



	// --------------------------------------------------------------------



	/**

	 * Drop database

	 *

	 * @access	private

	 * @param	string	the database name

	 * @return	bool

	 */

	function _drop_database($name)

	{

		return "DROP DATABASE ".$name;

	}



	// --------------------------------------------------------------------



	/**

	 * Create Table

	 *

	 * @access	private

	 * @param	string	the table name

	 * @param	array	the fields

	 * @param	mixed	primary key(s)

	 * @param	mixed	key(s)

	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL

	 * @return	bool

	 */

	function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)

	{

		$sql = 'CREATE TABLE ';



		if ($if_not_exists === TRUE)

		{

			if ($this->db->table_exists($table))

			{

				return "SELECT * FROM $table"; // Needs to return innocous but valid SQL statement

			}

		}



		$sql .= $this->db->_escape_identifiers($table)." (";

		$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

			{

				$attributes = array_change_key_case($attributes, CASE_UPPER);



				$sql .= "\n\t".$this->db->_protect_identifiers($field);



				$is_unsigned = (array_key_exists('UNSIGNED', $attributes) && $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;

				}



				// If this is an auto-incrementing primary key, use the serial data type instead

				if (in_array($field, $primary_keys) && array_key_exists('AUTO_INCREMENT', $attributes) 

					&& $attributes['AUTO_INCREMENT'] === TRUE)

				{

					$sql .= ' SERIAL';

				}

				else

				{

					$sql .=  ' '.$attributes['TYPE'];

				}



				// Modified to prevent constraints with integer data types

				if (array_key_exists('CONSTRAINT', $attributes) && strpos($attributes['TYPE'], 'INT') === false)

				{

					$sql .= '('.$attributes['CONSTRAINT'].')';

				}



				if (array_key_exists('DEFAULT', $attributes))

				{

					$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';

				}



				if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)

				{

					$sql .= ' NULL';

				}

				else

				{

					$sql .= ' NOT NULL';

				}



				// Added new attribute to create unqite fields. Also works with MySQL

				if (array_key_exists('UNIQUE', $attributes) && $attributes['UNIQUE'] === TRUE)

				{

					$sql .= ' UNIQUE';

				}

			}



			// don't add a comma on the end of the last field

			if (++$current_field_count < count($fields))

			{

				$sql .= ',';

			}

		}



		if (count($primary_keys) > 0)

		{

			// Something seems to break when passing an array to _protect_identifiers()

			foreach ($primary_keys as $index => $key)

			{

				$primary_keys[$index] = $this->db->_protect_identifiers($key);

			}



			$sql .= ",\n\tPRIMARY KEY (" . implode(', ', $primary_keys) . ")";

		}



		$sql .= "\n);";



		if (is_array($keys) && count($keys) > 0)

		{

			foreach ($keys as $key)

			{

				if (is_array($key))

				{

					$key = $this->db->_protect_identifiers($key);

				}

				else

				{

					$key = array($this->db->_protect_identifiers($key));

				}



				foreach ($key as $field)

				{

					$sql .= "CREATE INDEX " . $table . "_" . str_replace(array('"', "'"), '', $field) . "_index ON $table ($field); ";

				}

			}

		}



		return $sql;

	}



	// --------------------------------------------------------------------



	/**

	 * Drop Table

	 *

	 * @access    private

	 * @return    bool

	 */

	function _drop_table($table)

	{

		return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table)." CASCADE";

	}



	// --------------------------------------------------------------------



	/**

	 * Alter table query

	 *

	 * Generates a platform-specific query so that a table can be altered

	 * Called by add_column(), drop_column(), and column_alter(),

	 *

	 * @access	private

	 * @param	string	the ALTER type (ADD, DROP, CHANGE)

	 * @param	string	the column name

	 * @param	string	the table name

	 * @param	string	the column definition

	 * @param	string	the default value

	 * @param	boolean	should 'NOT NULL' be added

	 * @param	string	the field after which we should add the new field

	 * @return	object

	 */

	function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')

	{

		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ".$this->db->_protect_identifiers($column_name);



		// DROP has everything it needs now.

		if ($alter_type == 'DROP')

		{

			return $sql;

		}



		$sql .= " $column_definition";



		if ($default_value != '')

		{

			$sql .= " DEFAULT \"$default_value\"";

		}



		if ($null === NULL)

		{

			$sql .= ' NULL';

		}

		else

		{

			$sql .= ' NOT NULL';

		}



		if ($after_field != '')

		{

			$sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);

		}



		return $sql;



	}



	// --------------------------------------------------------------------



	/**

	 * Rename a table

	 *

	 * Generates a platform-specific query so that a table can be renamed

	 *

	 * @access	private

	 * @param	string	the old table name

	 * @param	string	the new table name

	 * @return	string

	 */

	function _rename_table($table_name, $new_table_name)

	{

		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);

		return $sql;

	}





}



/* End of file postgre_forge.php */

/* Location: ./system/database/drivers/postgre/postgre_forge.php */