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

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 4.3.2 or newer

 *

 * @package	 	CodeIgniter

 * @author	  	ExpressionEngine Dev Team

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

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

 * @link		http://codeigniter.com

 * @since	   	Version 1.0

 * @filesource

 */

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

/**

 * oci8 Database Adapter Class

 *

 * Note: _DB is an extender class that the app controller

 * creates dynamically based on whether the active record

 * class is being used or not.

 *

 * @package	 	CodeIgniter

 * @subpackage  Drivers

 * @category	Database

 * @author	  	ExpressionEngine Dev Team

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

 */

/**

 * oci8 Database Adapter Class

 *

 * This is a modification of the DB_driver class to

 * permit access to oracle databases

 *

 * NOTE: this uses the PHP 4 oci methods

 *

 * @author	  Kelly McArdle

 *

 */

class CI_DB_oci8_driver extends CI_DB {

	var $dbdriver = 'oci8';

	// The character used for excaping

	var $_escape_char = '"';

	/**

	 * The syntax to count rows is slightly different across different

	 * database engines, so this string appears in each driver and is

	 * used for the count_all() and count_all_results() functions.

	 */

	var $_count_string = "SELECT COUNT(1) AS ";

	var $_random_keyword = ' ASC'; // not currently supported

	// Set "auto commit" by default

	var $_commit = OCI_COMMIT_ON_SUCCESS;

	// need to track statement id and cursor id

	var $stmt_id;

	var $curs_id;

	// if we use a limit, we will add a field that will

	// throw off num_fields later

	var $limit_used;

	/**

	 * Non-persistent database connection

	 *

	 * @access  private called by the base class

	 * @return  resource

	 */

	function db_connect()

	{

		return @ocilogon($this->username, $this->password, $this->hostname);

	}

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

	/**

	 * Persistent database connection

	 *

	 * @access  private called by the base class

	 * @return  resource

	 */

	function db_pconnect()

	{

		return @ociplogon($this->username, $this->password, $this->hostname);

	}

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

	/**

	 * Select the database

	 *

	 * @access  private called by the base class

	 * @return  resource

	 */

	function db_select()

	{

		return TRUE;

	}

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

	/**

	 * Set client character set

	 *

	 * @access	public

	 * @param	string

	 * @param	string

	 * @return	resource

	 */

	function db_set_charset($charset, $collation)

	{

		// @todo - add support if needed

		return TRUE;

	}

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

	/**

	 * Version number query string

	 *

	 * @access  public

	 * @return  string

	 */

	function _version()

	{

		return ociserverversion($this->conn_id);

	}

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

	/**

	 * Execute the query

	 *

	 * @access  private called by the base class

	 * @param   string  an SQL query

	 * @return  resource

	 */

	function _execute($sql)

	{

		// oracle must parse the query before it is run. All of the actions with

		// the query are based on the statement id returned by ociparse

		$this->stmt_id = FALSE;

		$this->_set_stmt_id($sql);

		ocisetprefetch($this->stmt_id, 1000);

		return @ociexecute($this->stmt_id, $this->_commit);

	}

	/**

	 * Generate a statement ID

	 *

	 * @access  private

	 * @param   string  an SQL query

	 * @return  none

	 */

	function _set_stmt_id($sql)

	{

		if ( ! is_resource($this->stmt_id))

		{

			$this->stmt_id = ociparse($this->conn_id, $this->_prep_query($sql));

		}

	}

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

	/**

	 * Prep the query

	 *

	 * If needed, each database adapter can prep the query string

	 *

	 * @access  private called by execute()

	 * @param   string  an SQL query

	 * @return  string

	 */

	function _prep_query($sql)

	{

		return $sql;

	}

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

	/**

	 * getCursor.  Returns a cursor from the datbase

	 *

	 * @access  public

	 * @return  cursor id

	 */

	function get_cursor()

	{

		$this->curs_id = ocinewcursor($this->conn_id);

		return $this->curs_id;

	}

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

	/**

	 * Stored Procedure.  Executes a stored procedure

	 *

	 * @access  public

	 * @param   package	 package stored procedure is in

	 * @param   procedure   stored procedure to execute

	 * @param   params	  array of parameters

	 * @return  array

	 *

	 * params array keys

	 *

	 * KEY	  OPTIONAL	NOTES

	 * name		no		the name of the parameter should be in :<param_name> format

	 * value	no		the value of the parameter.  If this is an OUT or IN OUT parameter,

	 *					this should be a reference to a variable

	 * type		yes		the type of the parameter

	 * length	yes		the max size of the parameter

	 */

	function stored_procedure($package, $procedure, $params)

	{

		if ($package == '' OR $procedure == '' OR ! is_array($params))

		{

			if ($this->db_debug)

			{

				log_message('error', 'Invalid query: '.$package.'.'.$procedure);

				return $this->display_error('db_invalid_query');

			}

			return FALSE;

		}

		// build the query string

		$sql = "begin $package.$procedure(";

		$have_cursor = FALSE;

		foreach($params as $param)

		{

			$sql .= $param['name'] . ",";

			if (array_key_exists('type', $param) && ($param['type'] == OCI_B_CURSOR))

			{

				$have_cursor = TRUE;

			}

		}

		$sql = trim($sql, ",") . "); end;";

		$this->stmt_id = FALSE;

		$this->_set_stmt_id($sql);

		$this->_bind_params($params);

		$this->query($sql, FALSE, $have_cursor);

	}

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

	/**

	 * Bind parameters

	 *

	 * @access  private

	 * @return  none

	 */

	function _bind_params($params)

	{

		if ( ! is_array($params) OR ! is_resource($this->stmt_id))

		{

			return;

		}

		foreach ($params as $param)

		{

 			foreach (array('name', 'value', 'type', 'length') as $val)

			{

				if ( ! isset($param[$val]))

				{

					$param[$val] = '';

				}

			}

			ocibindbyname($this->stmt_id, $param['name'], $param['value'], $param['length'], $param['type']);

		}

	}

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

	/**

	 * Begin Transaction

	 *

	 * @access	public

	 * @return	bool

	 */

	function trans_begin($test_mode = FALSE)

	{

		if ( ! $this->trans_enabled)

		{

			return TRUE;

		}

		// When transactions are nested we only begin/commit/rollback the outermost ones

		if ($this->_trans_depth > 0)

		{

			return TRUE;

		}

		// Reset the transaction failure flag.

		// If the $test_mode flag is set to TRUE transactions will be rolled back

		// even if the queries produce a successful result.

		$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;

		$this->_commit = OCI_DEFAULT;

		return TRUE;

	}

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

	/**

	 * Commit Transaction

	 *

	 * @access	public

	 * @return	bool

	 */

	function trans_commit()

	{

		if ( ! $this->trans_enabled)

		{

			return TRUE;

		}

		// When transactions are nested we only begin/commit/rollback the outermost ones

		if ($this->_trans_depth > 0)

		{

			return TRUE;

		}

		$ret = OCIcommit($this->conn_id);

		$this->_commit = OCI_COMMIT_ON_SUCCESS;

		return $ret;

	}

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

	/**

	 * Rollback Transaction

	 *

	 * @access	public

	 * @return	bool

	 */

	function trans_rollback()

	{

		if ( ! $this->trans_enabled)

		{

			return TRUE;

		}

		// When transactions are nested we only begin/commit/rollback the outermost ones

		if ($this->_trans_depth > 0)

		{

			return TRUE;

		}

		$ret = OCIrollback($this->conn_id);

		$this->_commit = OCI_COMMIT_ON_SUCCESS;

		return $ret;

	}

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

	/**

	 * Escape String

	 *

	 * @access  public

	 * @param   string

	 * @return  string

	 */

	function escape_str($str)

	{

		// Access the CI object

		$CI =& get_instance();

		return $CI->_remove_invisible_characters($str);

	}

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

	/**

	 * Affected Rows

	 *

	 * @access  public

	 * @return  integer

	 */

	function affected_rows()

	{

		return @ocirowcount($this->stmt_id);

	}

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

	/**

	 * Insert ID

	 *

	 * @access  public

	 * @return  integer

	 */

	function insert_id()

	{

		// not supported in oracle

		return $this->display_error('db_unsupported_function');

	}

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

	/**

	 * "Count All" query

	 *

	 * Generates a platform-specific query string that counts all records in

	 * the specified database

	 *

	 * @access  public

	 * @param   string

	 * @return  string

	 */

	function count_all($table = '')

	{

		if ($table == '')

			return '0';

		$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows'). " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));

		if ($query == FALSE)

			{

			return 0;

			}

		$row = $query->row();

		return $row->NUMROWS;

	}

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

	/**

	 * Show table query

	 *

	 * Generates a platform-specific query string so that the table names can be fetched

	 *

	 * @access  private

	 * @param	boolean

	 * @return  string

	 */

	function _list_tables($prefix_limit = FALSE)

	{

		$sql = "SELECT TABLE_NAME FROM ALL_TABLES";

		if ($prefix_limit !== FALSE AND $this->dbprefix != '')

		{

			$sql .= " WHERE TABLE_NAME LIKE '".$this->dbprefix."%'";

		}

		return $sql;

	}

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

	/**

	 * Show column query

	 *

	 * Generates a platform-specific query string so that the column names can be fetched

	 *

	 * @access  public

	 * @param   string  the table name

	 * @return  string

	 */

	function _list_columns($table = '')

	{

		return "SELECT COLUMN_NAME FROM all_tab_columns WHERE table_name = '$table'";

	}

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

	/**

	 * Field data query

	 *

	 * Generates a platform-specific query so that the column data can be retrieved

	 *

	 * @access  public

	 * @param   string  the table name

	 * @return  object

	 */

	function _field_data($table)

	{

		return "SELECT * FROM ".$table." where rownum = 1";

	}

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

	/**

	 * The error message string

	 *

	 * @access  private

	 * @return  string

	 */

	function _error_message()

	{

		$error = ocierror($this->conn_id);

		return $error['message'];

	}

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

	/**

	 * The error message number

	 *

	 * @access  private

	 * @return  integer

	 */

	function _error_number()

	{

		$error = ocierror($this->conn_id);

		return $error['code'];

	}

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

	/**

	 * Escape the SQL Identifiers

	 *

	 * This function escapes column and table names

	 *

	 * @access	private

	 * @param	string

	 * @return	string

	 */

	function _escape_identifiers($item)

	{

		if ($this->_escape_char == '')

		{

			return $item;

		}

		if (strpos($item, '.') !== FALSE)

		{

			$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;

		}

		else

		{

			$str = $this->_escape_char.$item.$this->_escape_char;

		}

		// remove duplicates if the user already included the escape

		return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);

	}

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

	/**

	 * From Tables

	 *

	 * This function implicitly groups FROM tables so there is no confusion

	 * about operator precedence in harmony with SQL standards

	 *

	 * @access	public

	 * @param	type

	 * @return	type

	 */

	function _from_tables($tables)

	{

		if ( ! is_array($tables))

		{

			$tables = array($tables);

		}

		return implode(', ', $tables);

	}

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

	/**

	 * Insert statement

	 *

	 * Generates a platform-specific insert string from the supplied data

	 *

	 * @access  public

	 * @param   string  the table name

	 * @param   array   the insert keys

	 * @param   array   the insert values

	 * @return  string

	 */

	function _insert($table, $keys, $values)

	{

	return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";

	}

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

	/**

	 * Update statement

	 *

	 * Generates a platform-specific update string from the supplied data

	 *

	 * @access	public

	 * @param	string	the table name

	 * @param	array	the update data

	 * @param	array	the where clause

	 * @param	array	the orderby clause

	 * @param	array	the limit clause

	 * @return	string

	 */

	function _update($table, $values, $where, $orderby = array(), $limit = FALSE)

	{

		foreach($values as $key => $val)

		{

			$valstr[] = $key." = ".$val;

		}

		$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;

		$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';

		$sql = "UPDATE ".$table." SET ".implode(', ', $valstr);

		$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';

		$sql .= $orderby.$limit;

		return $sql;

	}

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

	/**

	 * Truncate statement

	 *

	 * Generates a platform-specific truncate string from the supplied data

	 * If the database does not support the truncate() command

	 * This function maps to "DELETE FROM table"

	 *

	 * @access	public

	 * @param	string	the table name

	 * @return	string

	 */

	function _truncate($table)

	{

		return "TRUNCATE TABLE ".$table;

	}

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

	/**

	 * Delete statement

	 *

	 * Generates a platform-specific delete string from the supplied data

	 *

	 * @access	public

	 * @param	string	the table name

	 * @param	array	the where clause

	 * @param	string	the limit clause

	 * @return	string

	 */

	function _delete($table, $where = array(), $like = array(), $limit = FALSE)

	{

		$conditions = '';

		if (count($where) > 0 OR count($like) > 0)

		{

			$conditions = "\nWHERE ";

			$conditions .= implode("\n", $this->ar_where);

			if (count($where) > 0 && count($like) > 0)

			{

				$conditions .= " AND ";

			}

			$conditions .= implode("\n", $like);

		}

		$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;

		return "DELETE FROM ".$table.$conditions.$limit;

	}

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

	/**

	 * Limit string

	 *

	 * Generates a platform-specific LIMIT clause

	 *

	 * @access  public

	 * @param   string  the sql query string

	 * @param   integer the number of rows to limit the query to

	 * @param   integer the offset value

	 * @return  string

	 */

	function _limit($sql, $limit, $offset)

	{

		$limit = $offset + $limit;

		$newsql = "SELECT * FROM (select inner_query.*, rownum rnum FROM ($sql) inner_query WHERE rownum < $limit)";

		if ($offset != 0)

		{

			$newsql .= " WHERE rnum >= $offset";

		}

		// remember that we used limits

		$this->limit_used = TRUE;

		return $newsql;

	}

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

	/**

	 * Close DB Connection

	 *

	 * @access  public

	 * @param   resource

	 * @return  void

	 */

	function _close($conn_id)

	{

		@ocilogoff($conn_id);

	}

}

/* End of file oci8_driver.php */

/* Location: ./system/database/drivers/oci8/oci8_driver.php */